#help-with-linux-sbcs | adafruit | Page 15

raw solar Jun 4, 2021, 8:32 PM

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Ah

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Hashbang I would have figured out easier XD

uncut lagoon Jun 4, 2021, 8:33 PM

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im used to that name

raw solar Jun 4, 2021, 8:33 PM

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This is the first I've ever heard it, lol

uncut lagoon Jun 4, 2021, 8:33 PM

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you learned something new then

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but yeah, @finite bay is right

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but it seems the prefered is #!/usr/bin/env bash

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this guarantees you use bash, for a consistent shell on different systems

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but the usual #!/bin/sh works as well

trim pond Jun 4, 2021, 10:52 PM

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yeah I think the reason its not working for me has to do with something else but I curbed it for now

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it would be nice tho, I am thinking about using cron for it though

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next I need to figure out how to re launch services if the internet goes out and they crash

trim pond Jun 5, 2021, 12:49 AM

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unsure if pi is stuck here or not, but I connected to another terminal session on the same pi and that is working just fine.... but no progress on this and its been.... a while

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never installed opencv before unsure if this is normal or not

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cancled it out and just re ran as pip install --upgrade pip pip install opencv-python and that worked X/

terse canyon Jun 6, 2021, 12:38 AM

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Hello, I am trying to stream the feed from my raspberrypi camera using ffmpeg. I am currently using: raspivid -o - -t 0 -w 1920 -h 1080 -b 8000000 -g 30 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i pipe:0 -c:v copy -c:a aac -ab 128k -g 30 -strict experimental -f flv -flvflags no_duration_filesize -r 30 "udp://0.0.0.0:1234" And to view the stream, I am trying to use both ffplay udp://127.0.0.1:1234 (on the same machine, hence localhost), and mplayer udp://127.0.0.1:1234

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I am leaving in the bit of a hack to pad in /dev/zeros for the audio since I do not believe that is hurting anything. The main focus point is the video.

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Attempting to read the data manually over udp via netcat also doesn't appear to send any data (nc -u 127.0.0.1 1234). So perhaps my ffmpeg binding to "udp://0.0.0.0:1234:" is not doing what I am thinking it should be doing?

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Well, maybe not? Using nc -ul 127.0.0.1 1234 (binding to the port as a server instead of a connecting as a client) I get data... How? udp://0.0.0.0:1234 should be binding to all network interfaces as a server and waiting for a client to connect. How on earth?

meager bay Jun 6, 2021, 1:39 AM

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Hi! Anybody here worked with this module before? https://www.adafruit.com/product/3006
I'm wondering if it's possible to play different frequencies like you would with a Piezo buzzer. Would I just connect this to the PWM pin?

Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A

Listen to this good news - we now have an all in one digital audio amp breakout board that works incredibly well with the Raspberry Pi! If you're looking for an easy and low cost ...

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Also, if I'm interfacing a number of peripherals (including the camera), how would I find out the exact current draw of my project?

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For example: I have a motor, a camera, LED strips, and a speaker. Is there a way I can find out exactly how much amps it will need? I'm trying to find a suitable battery 🙂

prime tulip Jun 6, 2021, 2:15 AM

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That amp needs I2S input; PWM wouldn't work. Easiest way to measure current if you have all the parts is to put them together and measure the current draw from a power supply with a multimeter or USB gadget. Otherwise, you can look at the data sheets for all those parts and look for a typical current draw number, but that probably won't be as easy for the motor.

meager bay Jun 6, 2021, 5:06 AM

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prime tulip That amp needs I2S input; PWM wouldn't work. Easiest way to measure current if y...

Thank you! Will try it out with my multimeter

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Having trouble finding resources on how to generate different frequency tones with this module + speaker. Should it just be done with a Piezo?

prime tulip Jun 6, 2021, 5:24 AM

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If you set up the module properly it should be as simple as playing the sound on the Pi, and there are a lot of ways to do that, but it looks like setting it up is a bit involved. If you really just want PWM and a tone, maybe it's not the right module. I don't think it's particularly well suited for driving a piezo. You could probably drive a piezo directly from the GPIO, if the result is loud enough.

meager bay Jun 6, 2021, 5:30 AM

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prime tulip If you set up the module properly it should be as simple as playing the sound on...

The way I have it right now is it can only play sound files like mp3 with a 4-ohm 3W speaker. The Piezo works fine with just the PWM pin btw thank you. I just wish I could do it easily with the speaker 😔

gilded stump Jun 6, 2021, 6:39 AM

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stupid question but any winXP uses here?
Are there serial/uart drivers for winXP? for pico specifically. Looks like even win7 is unsupported :/

faint sparrow Jun 6, 2021, 1:41 PM

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I seem to recall the Pico is the usual CDC/ACM interface.

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If you can do a CDC/ACM from say a SAMD21 target I'd bet the Pico would also work. @gilded stump

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In Linux it's /dev/ttyACM0

gilded stump Jun 6, 2021, 10:13 PM

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faint sparrow If you can do a CDC/ACM from say a SAMD21 target I'd bet the Pico would also wor...

Hey thanks, I'll try it 👍

lyric thicket Jun 7, 2021, 2:05 AM

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Just following up. No problems powering a QT Py 2040 off a Pi Zero's 3v output. Only problem is JP's clever rotary-encoder-stuck-on-a-QT trick (retroflective greenscreen project) doesn't work with PIO's consecutive pin requirement. I thought about using two state machines, but got bored and just soldered on some crossed wires.

robust geode Jun 7, 2021, 4:20 AM

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I have a few questions regarding the Pi 400. Are there board files or schematics available? Is the keyboard connected as a USB device (shows up in lsusb)? I was thinking about picking on up and designing a case that could hold the Pi 400 pcb and a 60% mechanical keyboard PCB.

pliant pebble Jun 7, 2021, 4:23 AM

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It doesn't look like it.

https://www.raspberrypi.org/documentation/hardware/raspberrypi/mechanical/README.md

Mechanical Drawings - Raspberry Pi Documentation

This section contains documentation with technical information about the Raspberry Pi hardware, including official add-ons and the Pi itself.

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https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/README.md

Schematics - Raspberry Pi Documentation

This section contains documentation with technical information about the Raspberry Pi hardware, including official add-ons and the Pi itself.

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If you want to see what's in it:

https://www.youtube.com/watch?v=DG1v_yZT7mU

YouTube

Elektor TV

Raspberry Pi 400 Teardown

Raspberry Pi 400 Teardown - What exactly is the Raspberry Pi 400, who is it for, and, most importantly, what’s inside?
In this video, we have a close look at the Raspberry Pi 400 and take it apart to see what is inside. Inspecting the circuit board shows some interesting changes compared to the Raspberry Pi 4 on which it is based.

More informa...

▶ Play video

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I think the guts are just a RPI4

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with a few extra gizmos

potent rose Jun 7, 2021, 4:28 AM

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the kb does show up when doing lsusb

robust geode Jun 7, 2021, 4:29 AM

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potent rose the kb does show up when doing lsusb

Well that's bodes well for me. I might just pick one up and have a go.

potent rose Jun 7, 2021, 4:30 AM

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it uses the other usb 2 hub leaving the other one for the mouse

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Bus 001 Device 005: ID 04d9:0007 Holtek Semiconductor, Inc. Raspberry Pi Internal Keyboard

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all the crap connected to my pi400: https://paste.debian.net/1200233/

robust geode Jun 7, 2021, 4:37 AM

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pliant pebble If you want to see what's in it: https://www.youtube.com/watch?v=DG1v_yZT7mU

Nice info here regarding the keyboard controller and how it interfaces with the USB hub.

pliant pebble Jun 7, 2021, 4:37 AM

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Thanks 🙂

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That's a lot 🙂

potent rose Jun 7, 2021, 4:39 AM

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powered usb hub

robust geode Jun 7, 2021, 4:58 AM

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This is neat,but kind of the opposite of what I was thinking. Custom PCB to match the Pi 400 case and keyboard matrix: https://www.40percent.club/2020/12/orthopi.html

ORTHOPI

A blog about small mechanical keyboards.

hardy plaza Jun 7, 2021, 5:11 AM

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robust geode This is neat,but kind of the opposite of what I was thinking. Custom PCB to matc...

It's a shame this isn't actually a product, pretty cool design.

short drift Jun 7, 2021, 7:07 AM

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yeah, the pi 400 keyboard being a permanent usb attachment is pretty much why the 400 only has 3 USB-A ports, compared to the pi 4's 4.

worn oak Jun 7, 2021, 1:34 PM

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hello all, I have a https://www.adafruit.com/product/4407 and a RPi4-8gb, I cannot get i2cdetect to find the mlx90640

Adafruit MLX90640 IR Thermal Camera Breakout

You can now add affordable heat-vision to your project and with an Adafruit MLX90640 Thermal Camera Breakout. This sensor contains a 24x32 array of IR thermal sensors. When connected to your ...

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this is a freshly installed and upgraded RPiOS

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the sensor works fine on my clue btw

faint sparrow Jun 7, 2021, 1:35 PM

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Yeah they used to call that one Raspbian, but now they call it RPiOS. ;)

worn oak Jun 7, 2021, 1:36 PM

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not the question

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😉

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been soldering cpus since 1980

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I remember when there was only 3 distros

opaque wagon Jun 7, 2021, 1:38 PM

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Quick idea - are you using sudo with your I2C detect?

worn oak Jun 7, 2021, 1:39 PM

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I have tried sudo and after sudo su

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should I run as user?

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trying that

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nothing

opaque wagon Jun 7, 2021, 1:40 PM

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Did you enable I2C in raspi-config?

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(And rebooted after that?)

worn oak Jun 7, 2021, 1:41 PM

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yes, i2cdetect -l lists the bus

opaque wagon Jun 7, 2021, 1:41 PM

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What command did you exactly use?

worn oak Jun 7, 2021, 1:42 PM

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i2cdetect -y 1

opaque wagon Jun 7, 2021, 1:42 PM

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How's the wiring?

worn oak Jun 7, 2021, 1:42 PM

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2,3,5,6

opaque wagon Jun 7, 2021, 1:43 PM

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Could you post a pic?

worn oak Jun 7, 2021, 1:43 PM

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ok

opaque wagon Jun 7, 2021, 1:43 PM

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~~Are you also powering the thermal camera correctly? I'm not familiar with it or the Clue but maybe the Clue is a 5v device and the thermal camera isn't compatible with 3v3?~~ product page explicitly states works with both voltages nvm 🙂

worn oak Jun 7, 2021, 1:43 PM

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ada says device works on either

opaque wagon Jun 7, 2021, 1:45 PM

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Have you tried using their example code? (And posting the exception if any?)
https://learn.adafruit.com/adafruit-mlx90640-ir-thermal-camera/python-circuitpython

Adafruit Learning System

Adafruit MLX90640 IR Thermal Camera

Affordable IR thermal sensing in a compact form!

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I gtg, hopefully you get it to work!

worn oak Jun 7, 2021, 1:48 PM

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getting pic

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oh well

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anyone else able to tell me why it doesnt show up?

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I have tried reversing sda and scl

worn oak Jun 7, 2021, 2:23 PM

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even tried altering speed

steady rose Jun 7, 2021, 4:15 PM

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@worn oak most likely a connection issue. are those alligator clips the only STEMMA cable you have?

upper burrow Jun 8, 2021, 1:08 AM

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Losing my darn mind... setting up a new instance of octoprint on a rpi and every step of the way it's fighting me.... Finally got it on the wireless network, ssh is enabled.... when I try to ssh connect it doesn't like my pi username/password but when I walk over to it and use that combo to log in on the local unit it lets me into the system as the pi user

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the ssh is as pi user

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not sure why it doesn't like me

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auth.log says I'm failing the password

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I am most definitely entering the same password on the local machine and the remote ssh. Not a capslock issue, for sure I'm typing the same password

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For sure I'm entering the same user as well

fresh patrol Jun 8, 2021, 1:18 AM

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Any symbols in your password?

upper burrow Jun 8, 2021, 1:18 AM

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I just realized the issue

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yeah

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the pi is prolly set to GB keyboard

fresh patrol Jun 8, 2021, 1:18 AM

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Pound sign 😉

upper burrow Jun 8, 2021, 1:19 AM

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oof

lilac obsidian Jun 8, 2021, 1:19 AM

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Was gonna ask if you'd adjusted locale yet

upper burrow Jun 8, 2021, 1:19 AM

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❤️

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every step setting up a new sd card has been like this today lol

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first issue was quotes in my psk 🙄

upper burrow Jun 8, 2021, 2:26 AM

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So, is anyone familiar with creating img's from pi's? I can use win32 disk imager to make a full backup, but it's 14gigs and I would like to get rid of the empty space and have the pi inflate on the first boot....

hardy plaza Jun 8, 2021, 2:31 AM

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upper burrow So, is anyone familiar with creating img's from pi's? I can use win32 disk image...

Look up pishrink

upper burrow Jun 8, 2021, 2:31 AM

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hmm, I just stumbled on that and am about to try it out

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any idea on auto-inflating on first run?

tropic yew Jun 8, 2021, 4:08 PM

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How hard would it be to get a Raspberry Pi Zero W to use a USB C port soldered to it's GPIO as an Ethernet out, which it uses to share it's wireless connection?

faint sparrow Jun 8, 2021, 4:10 PM

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The USB C port would be misused but convenient, so it's just a proper wiring job to get the electrical part right.
However, Ethernet doesn't work the same as GPIO.

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Pretty sure there are what amounts to transformers used.

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You're not going to graft that much onto a target board and magically come up with an Ethernet interface.

tropic yew Jun 8, 2021, 4:11 PM

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I'm not going to use the USB C solely for Ethernet

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And ah

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Might save myself a lot of time and headache to simply use a similar SBC that already comes with USB C

faint sparrow Jun 8, 2021, 4:14 PM

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Yeah if you want multiple things happening an SBC will get you there far faster.

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We see an endless parade of people here who think they're going to be the next one person band going down the street playing the cymbals with their knees and the tuba and some drums.

tropic yew Jun 8, 2021, 4:16 PM

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Hahaha

faint sparrow Jun 8, 2021, 4:16 PM

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;)

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The Raspberry Pi is pretty good at doing something like that.

tropic yew Jun 8, 2021, 4:18 PM

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Well, I need a small form factor if this is going to go anywhere, but a standard Pi would be easiest for prototyping probably

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Can it's Ethernet go both ways?

faint sparrow Jun 8, 2021, 4:22 PM

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What does both ways mean to you? Not sure I understand.

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With a regular desktop PC, you use two Ethernet cards to bridge in some situations. If you only have the one card, you cannot do some things.

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So for example that machine cannot behave as a firewall.

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Need two Ethernet ports to do that.

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Adafruit sold one stand-alone Ethernet dongle thing.

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Probably WICED but I don't remember.

tropic yew Jun 8, 2021, 4:25 PM

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faint sparrow What does both ways mean to you? Not sure I understand.

I meant Ethernet bi-directional, right?

faint sparrow Jun 8, 2021, 4:25 PM

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https://www.adafruit.com/product/3201

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I'm still not sure why you think it would ever be other than bi-directional.

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Where did you get the idea that it could only serve in a single direction from.

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maybe I need to drink some water. ;)

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Physically, Ethernet rides on four twisted pairs, iirc.

tropic yew Jun 8, 2021, 4:28 PM

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Well of course it can be bi directional because upload/download but I mean directional as in router to devices, but given the other contexts of Ethernet cables not sure why I imagined that would be a limitation

faint sparrow Jun 8, 2021, 4:29 PM

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I had an Ethernet cross-over cable that allowed me to avoid a router. It was connected between two laptops.

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It's just a physical wiring change so that it forms a shape like the letter X

tropic yew Jun 8, 2021, 4:30 PM

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Yeah, okay

faint sparrow Jun 8, 2021, 4:30 PM

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I was under the impression that each twisted pair was a transformer winding.

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I'm sure there's a Wikipedia article explaining what Ethernet is.

tropic yew Jun 8, 2021, 4:31 PM

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Haha

faint sparrow Jun 8, 2021, 4:31 PM

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(totally shutting out coaxial cable variant)

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That one was dead simple: RF cable.

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In those days it was 10 Base-T vs 10 Base-2.

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iirc.

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https://en.wikipedia.org/wiki/10BASE2

tropic yew Jun 8, 2021, 4:33 PM

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I remember back when modems were a thing people actually had and routers looked like rugged military equipment

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For whatever reason

faint sparrow Jun 8, 2021, 4:34 PM

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;)

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The Ethernet cards I had were 10BASE2 cards.

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They ran on pip cables (BNC terminated RF coaxial cable).

sinful shell Jun 8, 2021, 4:35 PM

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Thanks for your help```

tropic yew Jun 8, 2021, 4:35 PM

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Ah yes let me screw in my Ethernet real quick

faint sparrow Jun 8, 2021, 4:36 PM

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The public library ran 10BASE2 for a while. ;)

tropic yew Jun 8, 2021, 4:36 PM

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Ouch

faint sparrow Jun 8, 2021, 4:36 PM

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https://www.e-paper-display.com/products_detail/productId=302.html

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There's a development kit that is to be paired with that display to get anywhere at all with it, is my first guess.

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It's not a beginner's project.

sinful shell Jun 8, 2021, 4:45 PM

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faint sparrow It's not a beginner's project.

no, it's not, I am not beginner in programming, but I am beginner in electronics, and I don't necessary want to get much better, I don't need to much.

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I've found that development kit, but it's very bulky, I know that this display has nice documentation

faint sparrow Jun 8, 2021, 4:45 PM

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https://forum.arduino.cc/t/request-for-help-to-make-esp32-to-work-with-6-epaper-of-dalian-good-display/621973/2

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Don't worry - if my summary is off-base someone will step in to point that out. ;)

sinful shell Jun 8, 2021, 4:47 PM

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well, that's a lof of reading.... I think I kinda like that display, my question is, if it can be driven as dircetly as possible with raspberry pi zero, in as zero as to little space as possible (basically smaller == better)

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I want it to be similarly thick as M5Paper

faint sparrow Jun 8, 2021, 4:52 PM

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I don't think you understood.

sinful shell Jun 8, 2021, 4:52 PM

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well, probably not, maybe you can explain ?

faint sparrow Jun 8, 2021, 4:53 PM

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That display is of no use at all without other parts.

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I would first find out what the minimum bill of materials was to get any use out of it at all.

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I would suggest one of their development boards would be the place to begin.

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I'm not going to comment further, as it is beyond my personal experience what steps are required for certain.

sinful shell Jun 8, 2021, 4:54 PM

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So you are saying, that I should get their development kit ?

faint sparrow Jun 8, 2021, 4:55 PM

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Yes indeed. ;) that's the usual path towards getting stuff like this working at all.

sinful shell Jun 8, 2021, 4:55 PM

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but that's too expensive

faint sparrow Jun 8, 2021, 4:55 PM

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They are not in the hobbyist market.

sinful shell Jun 8, 2021, 4:55 PM

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If you now any way around, I would be happy to hear it, I need about 6" eink with touch

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but I've already got an option of getting an E-ink and adding touch layer

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but I was unable to find a good pair of display + touch layer

faint sparrow Jun 8, 2021, 4:56 PM

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Amazon broke the rules and made the Kindle. It was a very unusual event for personal electronics.

sinful shell Jun 8, 2021, 4:56 PM

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faint sparrow Amazon broke the rules and made the Kindle. It was a very unusual event for pers...

I don't understand, what are you trying to tell me

faint sparrow Jun 8, 2021, 4:57 PM

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I'm saying making a portable eInk display based project is not trivial.

sinful shell Jun 8, 2021, 4:57 PM

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yeah, I understand

faint sparrow Jun 8, 2021, 4:57 PM

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I think mobile read forums has a few experimenters who've repurposed Kindle.

sinful shell Jun 8, 2021, 4:57 PM

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but I am also not able to find any other type of display, that would have similarly low power consumption

faint sparrow Jun 8, 2021, 4:58 PM

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https://www.mobileread.com/forums/

sinful shell Jun 8, 2021, 4:58 PM

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faint sparrow I think mobile read forums has a few experimenters who've repurposed Kindle.

yeah repurposing Kindle is a option, but not for me....

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I don't have kindle, and it's to expensive...

faint sparrow Jun 8, 2021, 4:58 PM

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Why do you think you can do this project at all?

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I'm confused.

sinful shell Jun 8, 2021, 4:58 PM

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What you mean, why do I think I can do it ?

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I started this project very recently... so maybe I can't

faint sparrow Jun 8, 2021, 4:59 PM

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I've entirely forgotten what our electronics instructor used to say about this.

sinful shell Jun 8, 2021, 4:59 PM

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but I started watching great scott on youtube, and I guess, as there is a datasheet, there is a way

sinful shell Jun 8, 2021, 4:59 PM

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faint sparrow I've entirely forgotten what our electronics instructor used to say about this.

?

faint sparrow Jun 8, 2021, 4:59 PM

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For him, sure. Or Ben Eater.

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He talked about stick-to-it-tivity.

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My electronics instructor said if you quit it definitely will never happen.

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I'm just telling you the forecast for getting it done in the time frame I'm supposing you had in mind.

sinful shell Jun 8, 2021, 5:00 PM

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so, I was thinking, what with help of internet guys, like you, I will be able to get it somehow to work....

sinful shell Jun 8, 2021, 5:01 PM

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faint sparrow I'm just telling you the forecast for getting it done in the time frame I'm supp...

time frame ?

faint sparrow Jun 8, 2021, 5:01 PM

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I'm saying the shortcut is to spend the money and buy the dev kit.

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And be prepared for significant setbacks.

sinful shell Jun 8, 2021, 5:01 PM

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yeah... but I have as much time as I can (I don't have time limit or so.... and I have some time)

faint sparrow Jun 8, 2021, 5:02 PM

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That's a good start, in my view. Leave the time thing to itself.

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If you wake up every day thinking about what you're going to do to further this project, you may be onto something.

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My electronics instructor made his own TV sets. Had a factory.

sinful shell Jun 8, 2021, 5:03 PM

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Now I guess we are getting into Philosopy xD

faint sparrow Jun 8, 2021, 5:03 PM

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Pretty much.

sinful shell Jun 8, 2021, 5:03 PM

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I am gonna explain here my entire project here

faint sparrow Jun 8, 2021, 5:04 PM

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;)

sinful shell Jun 8, 2021, 5:04 PM

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and maybe you will be able to help me than

faint sparrow Jun 8, 2021, 5:04 PM

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It's a slow hour on this discord. There's tons of people who show up here and offer different perspectives.

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Just not at the moment.

sinful shell Jun 8, 2021, 5:04 PM

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what I want is, to make VERY powerful calculator, that can do graphs etc. (I can program it)

faint sparrow Jun 8, 2021, 5:05 PM

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So there's a practial tip: once you ask a question, stick around and wait for someone who has something to say about it.

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You know they now have a decent calculator already.

sinful shell Jun 8, 2021, 5:05 PM

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For getting best battery life I was thinking of using E-Ink, but now when I see, that E-Ink is a lot of work, I may change my mind....

sinful shell Jun 8, 2021, 5:05 PM

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faint sparrow You know they now have a decent calculator already.

nah... not powerful enough xD

faint sparrow Jun 8, 2021, 5:05 PM

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It's programmable. They sold the last one but the kit itself is probably still on the market.

sinful shell Jun 8, 2021, 5:06 PM

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wait ? what ?

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kit ?

faint sparrow Jun 8, 2021, 5:07 PM

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I would get one of these and see how it is:
https://www.adafruit.com/product/3790

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This calculator is designed to be moddable (for when you don't want to use it just for exams), with 3D models, firmware operating system source code, schematics and board layout details available to the public under a Creative Commons License. It is even possible to build your own 3D-printed collaborative calculator!

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Electronics costs real money.

sinful shell Jun 8, 2021, 5:09 PM

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you see these buttons ? uddfjkg they are awful 🙂 I don't want buttons... and I gues it's now much more powerfull ( if even ) than calculator like HP prime G2

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my problem is getting some E-ink setup....

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everything else is sort of straight forward then, and I have friend that can help me with it

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but not with e-ink

faint sparrow Jun 8, 2021, 5:16 PM

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Yeah eInk displays are a thing.

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I don't really know what they do - mobile read forums is the only place I've seen where people get that specific about it.

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Adafruit has the smaller ones.

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Obviously the larger ones are what people want.

sinful shell Jun 8, 2021, 5:17 PM

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faint sparrow Obviously the larger ones are what people want.

yeah, people want them, but manufacturers don't want to provide them to normal people

faint sparrow Jun 8, 2021, 5:18 PM

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Building an E-Ink Laptop

https://alexsoto.dev/building-an-e-ink-laptop.html

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someone dropped that link on me the other day but I haven't found the time for it.

sinful shell Jun 8, 2021, 5:19 PM

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sinful shell yeah, people want them, but manufacturers don't want to provide them to normal p...

they exsist, like waveshare 7.5" but they are not touch

faint sparrow Jun 8, 2021, 5:19 PM

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If you were able to root a kindle touch you'd have a linux box with e-ink display, and a touch interface.

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They sell them below market value because they expect you to use them to buy ebooks with them.

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That's why they cost less than 'expected'.

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Subsidized by book sales.

sinful shell Jun 8, 2021, 5:20 PM

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but they are not as powerful as rpi zero W, aren't they ?

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that's my biggest problem, I really want that power

faint sparrow Jun 8, 2021, 5:21 PM

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They're roughly in the same performance range, I'd suspect. I don't know.

sinful shell Jun 8, 2021, 5:22 PM

#

well, fairly surprising

#

and that's very old one

faint sparrow Jun 8, 2021, 5:23 PM

#

https://www.makeuseof.com/quartz64-e-ink-sbc/

#

We're pretty well off-topic for Raspberry Pi.

#

May want to take it to #general-chat (where this would be very much on topic. ;)

median spear Jun 8, 2021, 6:47 PM

#

hey everyone, i've got an issue with SPI-related stuff for my raspberry pi zero
basically, i'm trying to make a robot remote control that takes input from a small resistive pitft touchscreen, a 2 axis joystick, and a button. the issue here seems similar to this person's issue here:
https://www.raspberrypi.org/forums/viewtopic.php?p=1416536

from this thread, it seems like the display is taking up the SPI resources (idk the proper term for it, i'm still a big noob at this point), and that it's preventing spidev0.0 from existing

the main issue here is that i'm trying to connect a MCP3008 to convert the analog input from the joystick to digital, but the MCP3008 requires SPI to connect. i know that at some point you could use i2c to connect the MCP3008 before circuitpython came around, but i couldn't find any examples of this using circuitpython.

is there any way to fix the pitft taking up all the SPI resources or is there any way to connect the MCP3008 to my pi zero using i2c? thanks in advance

hardy plaza Jun 8, 2021, 9:44 PM

#

median spear hey everyone, i've got an issue with SPI-related stuff for my raspberry pi zero ...

From memory the Pi permits two SPI devices, so the question would be how to differentiate the two in hardware and software. On the Pimoroni Breakout Garden there are two SPI sockets, at SPI address 0 and 1 (or is it 1 and 2, can't remember).

median spear Jun 8, 2021, 9:48 PM

#

the thing is i'm not sure if the pitft takes up 2 spi devices because it's both a display and a touchscreen

#

also because i'm really new to the pi and hardware in general

hardy plaza Jun 8, 2021, 10:04 PM

#

If it's the Adafruit SPI display it just uses one.

#

Though I'm not sure I don't think the touchscreen is SPI. Anyone here know?

sterile barn Jun 9, 2021, 10:35 AM

#

Hey, any idea why this C program yields the following errors

#include <stdio.h>
#include <pigpio.h>

int main(){
    printf("Started!\n");
    gpioPWM(17, 255);
    time_sleep(2);
    gpioPWM(17, 0);
    printf("Ended!\n");
    return 0;
}

> gcc main.c -o main
/usr/bin/ld: /tmp/ccAOGx1a.o: in function `main':
main.c:(.text+0x18): undefined reference to `gpioPWM'
/usr/bin/ld: main.c:(.text+0x20): undefined reference to `time_sleep'
/usr/bin/ld: main.c:(.text+0x2c): undefined reference to `gpioPWM'
collect2: error: ld returned 1 exit status

i do have libpigpio installed via apt-get install libpigpio

> ls /usr/lib/libpigpio*
/usr/lib/libpigpiod_if2.so  /usr/lib/libpigpiod_if2.so.1  /usr/lib/libpigpiod_if.so  /usr/lib/libpigpiod_if.so.1  /usr/lib/libpigpio.so  /usr/lib/libpigpio.so.1

wraith grove Jun 9, 2021, 11:24 AM

#

somehow those functions aren't being included

faint sparrow Jun 9, 2021, 11:25 AM

#

~~'sudo apt-get install libgpiod-dev'~~ that's something else, I think.

#

(just a guess)

wraith grove Jun 9, 2021, 11:28 AM

#

I don't see gpioPWM in the function list for what I found, not explaining how time_sleep() fails on you

faint sparrow Jun 9, 2021, 11:30 AM

#

http://abyz.me.uk/rpi/pigpio/index.html

#

https://www.raspberrypi.org/forums/viewtopic.php?t=284826

sterile barn Jun 9, 2021, 11:40 AM

#

thanks for the help, unfortunately it didn't solve the issue 😦
i'll try to re-flash OS on this empty SD card and see if that'll make it work.. its an empty drive after all.

wraith grove Jun 9, 2021, 11:42 AM

#

I'm not sure it is that large scale of a problem

#

somehow pigpio.h simple isn't providing

sterile barn Jun 9, 2021, 11:45 AM

#

i haven't updated the OS in about a year if that's relevant. i did run apt-get update + apt-get upgrade however.

btw, i had another issue where having multiple i2c devices plugged in didn't make one of them work.
atm, i have the following plugged in:

DC stepper + motor hat (https://www.adafruit.com/product/2348)
VL53L0X TOF sensor (https://www.adafruit.com/product/3317)
BH1750 light sensor (https://www.adafruit.com/product/4681)

DC stepper + motor hat and VL53L0X work together just fine. however BH1750 doesn't want to work unless I plug out the other two I2C devices. Trying to run the example script (https://learn.adafruit.com/adafruit-bh1750-ambient-light-sensor/python-circuitpython) would output:

Traceback (most recent call last):
  File "test.py", line 9, in <module>
    sensor = adafruit_bh1750.BH1750(i2c)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bh1750.py", line 187, in __init__
    self.i2c_device = i2c_device.I2CDevice(i2c_bus, address)
  File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 76, in __init__
    raise ValueError("No I2C device at address: %x" % device_address)
ValueError: No I2C device at address: 23

However, If I plug out DC stepper + motor hat and VL53L0x sensor, BH1750 sensor works fine!

#

when all three i2c devices are plugged in, the script says no i2c device found at address 23 but sudo i2cdetect -y 1 says otherwise:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- 23 -- -- -- -- -- 29 -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: 70 -- -- -- -- -- -- --

hardy plaza Jun 9, 2021, 11:47 AM

#

Are you getting I2C bus address conflicts, or do you think the software library is looking for a device at the wrong address? I.e., if you list the addresses of each of those devices, are they matching what you see from i2cdetect?

sterile barn Jun 9, 2021, 11:49 AM

#

Yeah I don't think they're conflicting because when plug out all the three devices, and plug back DC stepper+motor hat and VL53L0X, i get this:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: 70 -- -- -- -- -- -- --

And, when I plug the BH1750 device, the output says 23 is occupied.
So I suppose that implies there isn't an address conflict happening between the three devices.

hardy plaza Jun 9, 2021, 11:50 AM

#

If you investigate the test scripts, are any of them altering the default i2c address in a constructor, e.g., "i2c_addr=0x29"?

sterile barn Jun 9, 2021, 11:52 AM

#

This is the test script:

import time
import board
import adafruit_bh1750

i2c = board.I2C()
sensor = adafruit_bh1750.BH1750(i2c)

while True:
    print("%.2f Lux" % sensor.lux)
    time.sleep(1)

adafruit_bh1750 library probably has the 0x29 somewhere in there, but i am not overriding the default addresses yet
The device begins working soon as I plug out other plugged-in i2c devices however, I suppose there's a limit on how many i2c devices can handled?

hardy plaza Jun 9, 2021, 11:53 AM

#

I've used the VL53L1x and BH1750 sensors together with no issues but never the stepper driver so I'm not seeing an answer myself, sorry. That looks pretty normal. Maybe tail -f /var/log/messages as you plug and unplug devices and run the test script, maybe you'll get a clue from the logs.

sterile barn Jun 9, 2021, 11:53 AM

#

Hmm interesting

hardy plaza Jun 9, 2021, 11:53 AM

#

But off to bed for me, 'nite.

sterile barn Jun 9, 2021, 11:53 AM

#

Good night! 🛏️

hardy plaza Jun 9, 2021, 11:53 AM

#

good luck

sterile barn Jun 9, 2021, 11:56 AM

#

Oh yeah, you're right. VL53L0X and BH1750 work together just fine. So the stepper+motor hat creates the issue

#

Wow okay, this is interesting. So the hat requires supplying a separate power source than the power source being used for raspberry pi for obvious reasons.
I didn't turn on the hat's power source but had it connected to the raspberry pi. It shows up as an i2c device even when it is turned off however.
When I turn on the hat's power supply (the green LED on it lights up), the BH1750 sensor along with the other i2c devices begin working.

hardy plaza Jun 9, 2021, 6:44 PM

#

sterile barn Wow okay, this is interesting. So the hat requires supplying a separate power so...

If you've got a powered-down device connected to the I2C bus it shouldn't show up at all, so if it is that sounds like the control portion is active, at least enough to react to the slave request. But it seems that whenever high-powered devices (motors, heaters, fans, relays) that have inductive or RF loads switch on or off, this can mess up the control circuitry.

sterile barn Jun 9, 2021, 7:53 PM

#

Yeah, I may have messed up my last raspberry pi by directly plugging motors in 😔

#

Has anyone tried the LSM6SOX 6 DOF sensor's gyro? It seems to be giving inaccurate results for me. This is the script I'm using:
https://github.com/adafruit/Adafruit_CircuitPython_LSM6DS/blob/main/examples/lsm6ds_lsm6dsox_simpletest.py
However, I occasionally get an error of ±0.20 radians when it lays flat on ground.

GitHub

adafruit/Adafruit_CircuitPython_LSM6DS

CircuitPython helper library for the LSM6DS family of motion sensors from ST - adafruit/Adafruit_CircuitPython_LSM6DS

#

I'm thinking of making use of it by attaching it to a toy RC car so I can rotate it (near) exactly 90° by comparing it's initial orientation / yaw against the differences.

meager bay Jun 9, 2021, 9:06 PM

#

Hello. Would my idea be possible to do between two Raspberry Pi wirelessly?
• Have one Pi have an LCD with a menu and some push buttons. Have another Pi with an LED and a buzzer.
• If I selected the option "turn on LED and buzzer" on the first Pi with the LCD menu after triggering a push button, this will send the signal to the second Pi and its LED and buzzer will be activated.
What protocol should I use for this?

opaque wagon Jun 9, 2021, 10:04 PM

#

Why can't you combine them? Seems simple enough to one Pi do them both. But if I need local network communication I use network zero (If you are using Python obviously):
https://pypi.org/project/networkzero/

PyPI

networkzero

Making networking simple for teachers

meager bay Jun 10, 2021, 12:46 AM

#

opaque wagon Why can't you combine them? Seems simple enough to one Pi do them both. But if I...

I was hoping to do a master-slave connection if there was no wifi available

frosty hill Jun 10, 2021, 1:04 AM

#

meager bay I was hoping to do a master-slave connection if there was no wifi available

You could use UART to communicate between the two with or without WiFi since there is UART over WiFi and UART connected directly, you can either use a hardware flow control or software flow control

opaque wagon Jun 10, 2021, 1:40 AM

#

Bluetooth maybe? I don't have much experience but maybe that could work? You could also get some wireless hardware transmitter and receivers, although I think doing it on one Pi is the best route based on what you said...

meager bay Jun 10, 2021, 2:47 AM

#

frosty hill You could use UART to communicate between the two with or without WiFi since the...

Thanks! I'll give that a try 🙂

meager bay Jun 10, 2021, 2:48 AM

#

opaque wagon Bluetooth maybe? I don't have much experience but maybe that could work? You cou...

I was planning on mounting the device somewhere high up and it would be convenient to have a way of being able to still control it if there was no wi-fi

frosty hill Jun 10, 2021, 2:48 AM

#

meager bay Thanks! I'll give that a try 🙂

Best of luck on that

#

I'm currently working on a RP2040 board with 60 GPIO pins and I needed it to talk to a RPi for something to do with a aim system fed to FPV goggles, I quickly realised I can either use USB or UART to talk between the two, I chose UART in the end because USB would take more programming and it's a headache to write up stuff for it

#

UART can be very flexible even if it is a old serial standard but most devices have it nowadays

#

just be careful as you can't have multiple devices on one UART bus, if you wanted to do that use a MCU with multiple UARTs and have it act as a communication center to forward messages and etc

hardy plaza Jun 10, 2021, 5:20 AM

#

sterile barn Yeah, I may have messed up my last raspberry pi by directly plugging motors in �...

That’s not really how electricity works. The pins may be damaged, yes, but in this case it may simply be they weren’t able to drive the motor. You can check by testing IO function on them now

sterile barn Jun 10, 2021, 6:14 AM

#

I can't do IO operations, nothing but the indicator LED works on it. I think this is safe to assume the hardware itself is damaged.

hidden pebble Jun 10, 2021, 6:44 AM

#

meager bay Hello. Would my idea be possible to do between two Raspberry Pi wirelessly? • Ha...

Take a look at GPIO Zero - it allows you to do remote control of another Pi's GPIO over WiFi.

sterile barn Jun 10, 2021, 7:04 AM

#

sterile barn I can't do IO operations, nothing but the indicator LED works on it. I think thi...

I had my raspberry pi set up in a way that it created a WiFi hotspot on startup, which it no longer does with that raspberry pi since the incident. I had also read of RPi4s having overheating issues soon as they were announced, so I wouldn't be surprised tbh.

#

I do understand how electricity works. The motors take up most of the current leaving little to no current for the system itself to operate. At most that would corrupt the software due to an immediate shutdown, but that's the last event that occurred before permanent shutdown.

meager bay Jun 10, 2021, 7:09 AM

#

hidden pebble Take a look at GPIO Zero - it allows you to do remote control of another Pi's GP...

Funny that you mention that. I was actually just trying it out 😄

#

Thank you

hidden pebble Jun 10, 2021, 7:11 AM

#

You're welcome. It's an intriguing piece of functionality that is not often used! 🙂

meager bay Jun 10, 2021, 7:12 AM

#

Can confirm it works. I thought I'd need a transceiver module but this is so convenient

hidden pebble Jun 10, 2021, 7:22 AM

#

🙂

hardy plaza Jun 10, 2021, 7:56 AM

#

sterile barn I can't do IO operations, nothing but the indicator LED works on it. I think thi...

Well, I'd then thank the Pi for its service and get yourself a new one. 😭 😀

sterile barn Jun 10, 2021, 11:04 AM

#

rip 😄 🙈

hardy plaza Jun 10, 2021, 11:11 AM

#

Yeah, my partner is Japanese and she's taught me to always thank the things that have helped me, even if they are inanimate, because there were many, many people involved in designing, manufacturing, selling and even shipping the thing to me. And the object itself did its duty, so it deserves thanks.

She even thanks the things that hurt her because they are part of her life and part of her education. It's an interesting viewpoint, and I think healthy.

#

...and I kinda like my little Pi computers. They're cool and have helped me learn many things, and they do their duty without complaint.

meager bay Jun 10, 2021, 6:21 PM

#

hardy plaza ...and I kinda like my little Pi computers. They're cool and have helped me lear...

Awesome perspective. I dislike it a lot when people say the Pi is just a toy

hardy plaza Jun 10, 2021, 6:33 PM

#

meager bay Awesome perspective. I dislike it a lot when people say the Pi is just a toy

Yeah, a teddy bear is a toy. I guess to some people a Raspberry Pi might be considered cute, but even the Raspberry Pi Zero is a fully-functioning Debian-style Linux computer. Not every application needs an Intel i9-10900XE 18 core processor to the job. And at least $900 just for the CPU, it's a bit pricey.

At $10 the Pi Zero W provides a 1 1GHz processor, onboard Bluetooth and WiFi, HD video and stereo audio on a board measuring 30mm by 65mm, and enough compute power to power a robot or create a live-video streaming server, which is what I'm using mine for right now. It's actually a remarkably powerful computer for its size, price and power comsumption.

quiet agate Jun 10, 2021, 8:10 PM

#

any pi people on?

fresh patrol Jun 10, 2021, 9:54 PM

#

On what?

sterile barn Jun 10, 2021, 10:54 PM

#

That is an interesting way to look at things thinkies

faint sparrow Jun 11, 2021, 1:41 PM

#

I just set up wireless on a Raspberry Pi Zero W and when I run apt-get update it runs into a Kernel Panic about an incorrect ARM program counter value?

#

faint sparrow Jun 11, 2021, 2:06 PM

#

force_turbo=1 and over_voltage=2 seemed to fix it

faint sparrow Jun 11, 2021, 2:40 PM

#

;) I'd have scratched my head about that one. And not come up with your solution.

#

apt-get update refreshes a database.

#

iirc

 $ ls /var/lib/apt/lists

#

that should show what got updated.

faint sparrow Jun 11, 2021, 7:32 PM

#

faint sparrow ;) I'd have scratched my head about that one. And not come up with your solutio...

It was frequency scaling that caused it

meager bay Jun 12, 2021, 1:25 AM

#

What's a good way to implement a menu with an LCD? I want to scroll through a list of options with an LCD (maybe using a potentiometer or buttons)
For example: Option 1 is "Turn LED on". If the LCD is on that option and I press a button, it should turn on an LED.

#

Should I just make a list of strings for it?

faint sparrow Jun 12, 2021, 9:52 AM

#

@faint sparrow That makes sense. I wonder if RPi4B is any different than predecessor boards in that regard.

faint sparrow Jun 13, 2021, 10:34 AM

#

@meager bay Here's an idea for a simple dispatcher I saw recently:

#

This is the program:
https://github.com/wa1tnr/rp2040-arduino-basics-a/blob/main/monitor.d/monitor-aa/n_monitor-aa_SKETCH.cpp#L60

#

This is the program dispatcher:
https://github.com/wa1tnr/rp2040-arduino-basics-a/blob/main/monitor.d/monitor-aa/n_monitor-aa_SKETCH.cpp#L123

#

Upstream is:
https://github.com/CharleyShattuck/Steno-Keyboard-Arduino/blob/master/ITC-Forth.ino

#

(Arduino based, not Raspberry Pi at all.)

#

Each case in the 'program' is handled in the dispatcher, so in this instance, it's a linear sequence of pseudo-instructions (in the so-called 'program') but the technique could be adapted to a menu, I think.

#

const int memory [] { 6, 1, 2, 3, 4, 5, 6, 7, 1 };

#

That's the entire 'program' for this virtual machine!

#

It would normally begin with 1, 2, 3, .. but I wanted initialization.

#

Choice of language (python, C, perl &c.) would deeply affect the approaches possible.

meager bay Jun 13, 2021, 3:42 PM

#

faint sparrow Each `case` in the 'program' is handled in the dispatcher, so in this instance, ...

Interesting. Thanks for the idea! How do you trigger the cases?

#

Also @faint sparrow please correct me if I am wrong, but do you iterate through the memory array with your cases? This array keeps track of where you are right?

faint sparrow Jun 13, 2021, 4:22 PM

#

@meager bay I'm not really sure exactly what happens - just the effects.

#

It's an array of ints for the memory/program.

#

Apparently the case/switch stuff can interact with it.

#

You could use the C Preprocessor to create symbol names that represent those ints in the memory array, to make it more legible.

#

Same technique, expanded:
https://github.com/wa1tnr/rp2040-arduino-basics-a/blob/main/monitor.d/monitor-hh-p/n_monitor-hh-p_SKETCH.cpp#L134

faint sparrow Jun 13, 2021, 4:46 PM

#

        case op_lit: // literal
        _lit:
            push(memory[I]);
            I++;
            goto next;

#

     op_lit, 4000, op_dly,
     /* blink */
     op_lit, led, op_pon,  op_lit,  1100,   op_dly,
     op_lit, led, op_pof,  op_lit,  n1_sec, op_dly,

#

Now that means that I have not just instruction opcodes but also data in that array. ;)

#

In this case, the literal 4000 which is the number of milliseconds I want the delay to last.

faint sparrow Jun 13, 2021, 5:19 PM

#

That's a wallful of text from me; will termbin it and truncate at least some of it, now. ;) EDIT: done!

#

https://termbin.com/p67g

meager bay Jun 13, 2021, 6:36 PM

#

faint sparrow That's a wallful of text from me; will termbin it and truncate at least some of ...

Thank you for this! Very helpful 😄

meager bay Jun 13, 2021, 7:57 PM

#

faint sparrow That's a wallful of text from me; will termbin it and truncate at least some of ...

I've decided to implement my menu by using state machines and writing my own classes for it in Python. Thank you for the help!

#

Now I just can't decide whether or not I should use either a potentiometer or some push buttons to cycle through the menu 😄

#

Using a potentiometer would require an ADC right?

daring spade Jun 13, 2021, 9:05 PM

#

hey hope everyone is doing great, so im doing a project with raspberry pi 3 and arduino , i need to make user interface but im kinda stuck i dunno where to start any documents or examples on user inputs ?

green spire Jun 13, 2021, 9:07 PM

#

What sort of user interface? Buttons & LEDs? Touchscreen?

daring spade Jun 13, 2021, 9:09 PM

#

green spire What sort of user interface? Buttons & LEDs? Touchscreen?

yeah like basically user data and then start and stop buttons

#

and also heart rate and humidity display

green spire Jun 13, 2021, 9:11 PM

#

Small OLED and a bunch of buttons then.

daring spade Jun 13, 2021, 9:11 PM

#

oh its a web server btw

#

yeah ,its my first raspb project so im kinda stuck

green spire Jun 13, 2021, 9:13 PM

#

In that case, I'd say use a web interface and display it on a touchscreen with a fullscreen browser window started on bootup/after the webserver launched.

#

aka Kiosk setup
https://desertbot.io/blog/raspberry-pi-touchscreen-kiosk-setup

desertbot.io

Raspberry Pi Touchscreen Kiosk Setup (10 Steps)

This article covers setting up a Raspberry Pi to run a Web app in kiosk mode on a touchscreen or monitor.

daring spade Jun 13, 2021, 9:18 PM

#

potatomelt thank you so much !!! i really had no idea where to start

green spire Jun 13, 2021, 9:20 PM

#

Always happy to help. 🙂

faint sparrow Jun 13, 2021, 10:27 PM

#

@meager bay cool!

#

@meager bay Yeah I made a 'fretless keyboard' that was resistive.

#

You just read a voltage with an ADC peripheral (most MCU chips have them as on-chip peripherals).

#

Potentiometers are either Linear or Tapered/Logarithmic I think.

#

There are stepped pots for audiophiles but they cost a bundle.

#

(basically a union of a rotary switch and a resistive network, I'd guess)

#

I would go for widest arc separating 'stations' on this 'radio dial'.

#

Work out each one experimentally.

#

If one type of pot is too touchy, try the other type and see if it makes it even worse, or offers improvement.

#

I've been meaning to setup several pots in an R2/R net to find optimal values experimentally for several pushbuttons.

#

https://en.wikipedia.org/wiki/Resistor_ladder

#

(cheap resistor DAC)

#

Raspberry Pi now has a VGA resistor DAC thing going for cheap video from the Pico.

#

Should probably copy the design and see how it fares.

celest girder Jun 13, 2021, 10:51 PM

#

relay

meager bay Jun 14, 2021, 5:15 AM

#

@faint sparrow Thank you again 😄

faint sparrow Jun 14, 2021, 4:17 PM

#

meager bay <@456226577798135808> Thank you again 😄

Glad to help!

jade thunder Jun 14, 2021, 4:20 PM

#

Hi guys, I need some help for accessing my raspberry pi in headless mode

#

Basically after I have done a first time setup on my raspberry pi, I enabled SSH and also VNC before rebooting

#

Now when I try to SSH into my rasp, it says connection time out

faint sparrow Jun 14, 2021, 4:22 PM

#

@jade thunder what did you try so far.

jade thunder Jun 14, 2021, 4:23 PM

#

If I try VNC, it says "Time out response from the computer"

#

I've been looking all around, but I couldn't find any clue what's causing this

faint sparrow Jun 14, 2021, 4:23 PM

#

In the old days we'd check to see if the node could be ping'd first.

jade thunder Jun 14, 2021, 4:24 PM

#

@faint sparrow Okay, so how can I do that?

#

I know my rasp IP address

faint sparrow Jun 14, 2021, 4:24 PM

#

$ sudo ping 192.168.1.1

jade thunder Jun 14, 2021, 4:24 PM

#

Do i enter that into my cmd?

faint sparrow Jun 14, 2021, 4:24 PM

#

(sudo may not be required; I don't remember)

#

Always use the shell when you see typed commands. Pretty much.

jade thunder Jun 14, 2021, 4:25 PM

#

Ok, let me try now

faint sparrow Jun 14, 2021, 4:25 PM

#

The IP address I gave was an example; use the one for the node you want to connect to.

jade thunder Jun 14, 2021, 4:26 PM

#

Hmm, this doesnt make sense

#

Here's the response from shell

Pinging 192.168.1.112 with 32 bytes of data:
Reply from 192.168.1.108: Destination host unreachable.
Reply from 192.168.1.108: Destination host unreachable.
Reply from 192.168.1.108: Destination host unreachable.
Reply from 192.168.1.108: Destination host unreachable.

Ping statistics for 192.168.1.112:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

faint sparrow Jun 14, 2021, 4:28 PM

#

$ sudo netstat -rn

#

If there's more than say ten lines those don't matter at the bottom)

jade thunder Jun 14, 2021, 4:30 PM

#

There's IPv6 route table, IPv4 route table

#

What should I be looking for?

faint sparrow Jun 14, 2021, 4:30 PM

#

generally two entries are required.

#

Gateway is the router on a regular setup.

#

The Iface column names your ethernet NIC device name.

jade thunder Jun 14, 2021, 4:34 PM

#

By Iface, do you mean Interface List ?

faint sparrow Jun 14, 2021, 4:34 PM

#

What operating system are you typing this in?

#

My assumptions are Linux (it's all I run)

jade thunder Jun 14, 2021, 4:34 PM

#

Windows 10, sorry my bad for not mentioning this earlier

faint sparrow Jun 14, 2021, 4:34 PM

#

;)

#

Yeah it could be somewhat different or a lot different.

#

Basically the host PC you are on gets a DHCP Lease from your router.

#

So does the Raspberry Pi.

#

They're on the same subnet.

#

The router ordinarily lets you talk to each other behind the firewall.

#

The ssh port has to be open and the sshd daemon has to be listening for inbound connections.

#

A firewall resident on the Raspberry Pi (if it has a firewall running) can block inbound ssh connections.

#

If there's no firewall on the RPi and it has sshd running, it'll usually allow inbound connections.

#

If everything succeeds you gain a shell on the machine running sshd.

#

The routing table on the machine you are trying to connect from usually has a Destination for just your LAN, iirc.

#

It'd be something like 192.168.1.0 to indicate all of that subnet, with a mask of I think255.255.255.0.

#

It is of course much easier if you can already connect to any other machine on your LAN - that proves (generally) that routing has been setup to do that.

jade thunder Jun 14, 2021, 4:41 PM

#

Okay, so I should be seeing my raspberry pi IP address in the route table? Since i enabled SSH on it?

faint sparrow Jun 14, 2021, 4:41 PM

#

Not usually, no. Do you have a regular router that 'everything' connects through?

jade thunder Jun 14, 2021, 4:41 PM

#

Oh yes, of course.

faint sparrow Jun 14, 2021, 4:42 PM

#

So it probably assigns each node on your LAN an IP address via the DHCP protocol.

#

Ordinarily they can all talk to one another.

jade thunder Jun 14, 2021, 4:42 PM

#

I actually login into my wireless router to check out my rasp IP address

faint sparrow Jun 14, 2021, 4:42 PM

#

Can any of your nodes talk to any other?

jade thunder Jun 14, 2021, 4:44 PM

#

Erm... I'm not quite sure what do you mean by that uhh

#

I mean I can see my computer's IP address, my phone's, my brother's phone, those devices Ip address over there

faint sparrow Jun 14, 2021, 4:44 PM

#

You're trying to get two nodes talking to eachother. I was wondering if any nodes you have can talk to any others, already.

jade thunder Jun 14, 2021, 4:45 PM

#

I think no? But I've tried doing the usual routine of accessing my raspi using vnc before

#

I mean it was working, all i need is just enter my rasp IP address in the VNC on my computer and then I'm in

faint sparrow Jun 14, 2021, 4:46 PM

#

Oh so it was working before - that should rule out router stuff unless all other things have been tried.

#

(the router ought to allow the ssh connection to succeed)

jade thunder Jun 14, 2021, 4:47 PM

#

I see

faint sparrow Jun 14, 2021, 4:47 PM

#

So that sounds a bit like a routing issue for the Windows machine.

#

Maybe it only has a routing table entry for the Internet (for addresses not on your LAN).

jade thunder Jun 14, 2021, 4:49 PM

#

Hmm, I tried using the VNC app to try login into rasp, no result too

faint sparrow Jun 14, 2021, 4:49 PM

#

So I think a destination of 192.168.1.0 with a mask of 255.255.255.0 needs to be added to the routing table.

#

OTOH why did it work before. ;)

#

(the same destination would have to be in the routing table for it to have allowed that connection that did work)

jade thunder Jun 14, 2021, 4:50 PM

#

That's what puzzled me too😫

faint sparrow Jun 14, 2021, 4:50 PM

#

That the ping was received is a puzzle.

#

If you unplug the Raspberry Pi and ping, what happens? Does the ping look different?

jade thunder Jun 14, 2021, 4:51 PM

#

Well, technically there wasnt any ping received when I tried pinging my rasp IP address

jade thunder Jun 14, 2021, 4:51 PM

#

jade thunder Here's the response from shell ``` Pinging 192.168.1.112 with 32 bytes of data: ...

See here's the response

faint sparrow Jun 14, 2021, 4:51 PM

#

Some NIC's blink the LED with each ping.

jade thunder Jun 14, 2021, 4:52 PM

#

Unless I misunderstood the console message?

faint sparrow Jun 14, 2021, 4:52 PM

#

I just want to see the output of ping, with and without the cable connected to the RPi for contrast.

#

They should be different.

jade thunder Jun 14, 2021, 4:53 PM

#

Ok, so do I plug in my rasp into my router and try pinging again?

faint sparrow Jun 14, 2021, 4:53 PM

#

Do it both ways and post both, in separate messages here. ;)

#

(long messages just jam up the Discord client)

jade thunder Jun 14, 2021, 4:54 PM

#

sure, gimme a sec

#

This is the result of raspi with LAN cable plugged into my router:

Pinging 192.168.1.112 with 32 bytes of data:
Reply from 192.168.1.112: bytes=32 time=400ms TTL=64
Reply from 192.168.1.112: bytes=32 time=370ms TTL=64
Reply from 192.168.1.112: bytes=32 time=172ms TTL=64
Reply from 192.168.1.112: bytes=32 time=112ms TTL=64

Ping statistics for 192.168.1.112:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 112ms, Maximum = 400ms, Average = 263ms

This is the result with the LAN cable unplugged:


Pinging 192.168.1.112 with 32 bytes of data:
Reply from 192.168.1.108: Destination host unreachable.
Reply from 192.168.1.108: Destination host unreachable.
Reply from 192.168.1.108: Destination host unreachable.
Request timed out.

Ping statistics for 192.168.1.112:
    Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),

#

What?.... z_think3d

faint sparrow Jun 14, 2021, 4:59 PM

#

good.

#

The time=370ms means the ping succeeded I think.

jade thunder Jun 14, 2021, 5:00 PM

#

but why? This is so weird

faint sparrow Jun 14, 2021, 5:00 PM

#

You're probably pretty close to the correct settings on both your router and in Windows.

#

route print | more should show you what netstat -rn does in Linux.

#

I'm guessing you're already routing though.

jade thunder Jun 14, 2021, 5:02 PM

#

Well, good news is I can access my rasp through VNC already, only with the LAN cable plugged in

faint sparrow Jun 14, 2021, 5:02 PM

#

And that your issue is to be resolved at the Linux shell prompt on the Raspberry Pi.

#

Yeah if you have a VNC session on the target a lot of things are already correctly setup.

#

Starting to sound like sshd on the Pi isn't .. functional.

jade thunder Jun 14, 2021, 5:04 PM

#

But I don't understand why cant I start VNC session on my raspi wirelessly

#

I mean my raspi is connected to my network already, isnt it? That's how it can have its own IP address

faint sparrow Jun 14, 2021, 5:04 PM

#

Oh as far as I know wireless connections are a different matter.

#

I think people generally resort to a wired LAN connection to get 'into' the RPi until they've gained some experience with that method, before trying wireless.

#

Let's see ifconfig from the RPi - is it possible to do it easily?

#

$ sudo ifconfig

#

On the RPi

#

If you are using VNC to get a shell on the RPi you may be able to copy and paste from the shell window.

jade thunder Jun 14, 2021, 5:07 PM

#

Ok, hold on

#

Here's the result:

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.109  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2001:d08:d3:c6dc:4c3b:ab26:cddc:a46e  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::50ca:271b:7f98:5242  prefixlen 64  scopeid 0x20<link>
        ether dc:a6:32:a4:d8:61  txqueuelen 1000  (Ethernet)
        RX packets 544  bytes 51729 (50.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 510  bytes 167797 (163.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 5  bytes 284 (284.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5  bytes 284 (284.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.112  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::18fb:5f6a:f5e8:684c  prefixlen 64  scopeid 0x20<link>
        inet6 2001:d08:d3:c6dc:1b86:b2e5:62ce:2552  prefixlen 64  scopeid 0x0<global>
        ether dc:a6:32:a4:d8:63  txqueuelen 1000  (Ethernet)
        RX packets 72  bytes 7029 (6.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 88  bytes 11847 (11.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

faint sparrow Jun 14, 2021, 5:10 PM

#

okay so .109 is eth0 (the wired NIC).

jade thunder Jun 14, 2021, 5:10 PM

#

yup

faint sparrow Jun 14, 2021, 5:10 PM

#

ssh to .109 not to .112

#

(I'm assuming sshd isn't listening on both wlan0 and on eth0 but just eth0).

jade thunder Jun 14, 2021, 5:12 PM

#

Hmm, I tried pinging both .109 and .112

#

Both address give me a response

faint sparrow Jun 14, 2021, 5:13 PM

#

Don't do anything you believe will change the relationship to VNC as that's your way in at the moment.

jade thunder Jun 14, 2021, 5:13 PM

#

Yeah of course

#

Well, I can connect to rasp via VNC using both .109 and .112

faint sparrow Jun 14, 2021, 5:15 PM

#

also wlan0 has super low traffic counts which sounds like it's being ignored by active network connections.

jade thunder Jun 14, 2021, 5:16 PM

#

wlan0 is my raspi wifi, right?

faint sparrow Jun 14, 2021, 5:16 PM

#

So that pretty much leaves open ports or blocked ports, and an active sshd listening for inbound.

#

Yes wlan0 is teh raspi wifi yup

#

eth0 is the wired ethernet to the raspi

#

$ ps auxwwww | egrep ssh on the raspi

jade thunder Jun 14, 2021, 5:19 PM

#

pi         637  0.0  0.0   4520   288 ?        Ss   01:06   0:00 /usr/bin/ssh-agent x-session-manager
pi         677  0.0  0.0   4520   288 ?        Ss   01:06   0:00 /usr/bin/ssh-agent -s
pi        2823  0.0  0.0   7348   564 pts/0    S+   01:18   0:00 grep -E --color=auto ssh

#

what does this means?

faint sparrow Jun 14, 2021, 5:20 PM

#

pi is the logged in user.

#

Looks like root is running sshd so I'd expect a connection to be possible.

#

try:

#

pi $ ssh localhost

#

from the Raspberry Pi shell (vnc is fine)

#

The ssh-agent I think is background and doesn't count here.

jade thunder Jun 14, 2021, 5:22 PM

#

ok, looks like I logged into my own raspi on my raspi?

faint sparrow Jun 14, 2021, 5:22 PM

#

yup.

#

Try the process table thing with that ssh session going.

#

$ ps auxwwww | egrep ssh

#

(there should be a new process ID above 2823 for the session .. maybe two or three of them)

jade thunder Jun 14, 2021, 5:24 PM

#

pi         637  0.0  0.0   4520   288 ?        Ss   01:06   0:00 /usr/bin/ssh-agent x-session-manager
pi         677  0.0  0.0   4520   288 ?        Ss   01:06   0:00 /usr/bin/ssh-agent -s
pi        3358  0.0  0.1  12120  4956 pts/0    S+   01:21   0:00 ssh localhost
root      3359  0.1  0.1  12240  6308 ?        Ss   01:21   0:00 sshd: pi [priv]
pi        3478  0.0  0.0  12240  3476 ?        S    01:21   0:00 sshd: pi@pts/1
pi        3704  0.0  0.0   7348   552 pts/1    S+   01:23   0:00 grep -E --color=auto ssh

faint sparrow Jun 14, 2021, 5:25 PM

#

Yeah, so:

pi        3358  0.0  0.1  12120  4956 pts/0    S+   01:21   0:00 ssh localhost
root      3359  0.1  0.1  12240  6308 ?        Ss   01:21   0:00 sshd: pi [priv]
pi        3478  0.0  0.0  12240  3476 ?        S    01:21   0:00 sshd: pi@pts/1

#

it will look very similar when you login from Windows.

#

The ssh localhost is you trying to ssh to the same machine .. that part won't be showing when you use the Windows PC to ssh into this raspi.

jade thunder Jun 14, 2021, 5:26 PM

#

okay

faint sparrow Jun 14, 2021, 5:26 PM

#

So you can see that there's one process owned by root and one by pi once you've successfully gained a shell.

#

We've proven that sshd is running on the raspi.

jade thunder Jun 14, 2021, 5:27 PM

#

I see

faint sparrow Jun 14, 2021, 5:27 PM

#

That would ordinarily indicate the raspi is blocking connections inbound from the LAN but not from localhost.

#

(if indeed it is blocking - may not be)

#

Let's look at the routing table on the raspi.

#

$ sudo netstat -rn
also:

#

$ sudo netstat -n

#

One of those is super long; only the top part matters.

jade thunder Jun 14, 2021, 5:28 PM

#

Do I need to quit from my current ssh session on my raspi to do this?

faint sparrow Jun 14, 2021, 5:28 PM

#

Nope. Better to leave it going!

jade thunder Jun 14, 2021, 5:28 PM

#

ok

faint sparrow Jun 14, 2021, 5:30 PM

#

Yeah don't post netstat -n that's too much information to put out in public.

jade thunder Jun 14, 2021, 5:30 PM

#

haha ok

jade thunder Jun 14, 2021, 5:30 PM

#

faint sparrow ` $ sudo netstat -rn` also:

Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 eth0
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0

#

So what does this mean?

faint sparrow Jun 14, 2021, 5:31 PM

#

Looks to me like you can ssh out from the raspi on either interface.

#

Which would confuse things!

jade thunder Jun 14, 2021, 5:31 PM

#

Either interface? means?

faint sparrow Jun 14, 2021, 5:31 PM

#

You may very well be in a situation where both interfaces are active on the same subnet.

#

(that to me seems counter-intuitive)

#

When you want to ssh out from raspi, how can it choose a destination when there are two paths out? ;)

#

I would try - but don't try it yet:

#

sudo ifconfig eth0 down

#

That would disable the NIC (wired ethernet)

#

Hopefully that disabled state would not propagate across cold boots.

jade thunder Jun 14, 2021, 5:33 PM

#

faint sparrow You may very well be in a situation where both interfaces are active on the same...

Sorry what interface are you referring to here? Is it my eth0 and wlan0?

faint sparrow Jun 14, 2021, 5:33 PM

#

When you cycle power it should just behave as if you'd never brought the interface down.

#

I think both eth0 and wlan0 are on the same subnet.

#

I never do that so I don't know what happens if you do.

#

I bring one interface down before bringing the other one up - or at least before trying to use it.

jade thunder Jun 14, 2021, 5:35 PM

#

Well could it because of I have my raspi connected with wifi and also the LAN cable at the same time?

faint sparrow Jun 14, 2021, 5:35 PM

#

Well just supposing sshd has a policy that forbids wifi and only allows ethernet.

#

I don't know what the default setup is.

#

Since you're using wlan0 as a VNC session I don't want that interface taken down.

jade thunder Jun 14, 2021, 5:37 PM

#

Oh, okay. So you're saying its abnormal for my raspi to be able to SSH into it using wifi and LAN at the same time?

faint sparrow Jun 14, 2021, 5:37 PM

#

That leaves disabling eth0 to see if the ssh from Windows will then succeed.

#

You can't ordinarly use both at the same time for the same conversation.

#

There's a name for that but I don't remember the name. 'load balancing' for network traffic or something.

jade thunder Jun 14, 2021, 5:38 PM

#

I see, ok

jade thunder Jun 14, 2021, 5:38 PM

#

faint sparrow ` sudo ifconfig eth0 down`

So erm, I can just unplug my LAN cable to "simulate" this situation?

faint sparrow Jun 14, 2021, 5:40 PM

#

No because it may still try to route to eth0.

jade thunder Jun 14, 2021, 5:40 PM

#

Ahh ok

faint sparrow Jun 14, 2021, 5:40 PM

#

Hopefully you refer to Discord this conversation if you run into trouble later on.

#

$ sudo ifconfig eth0 up reverses it ordinarily.

#

Sometimes, routing has to be setup again &c.

#

But I would expect a cold boot to just restore it to the way you had it three hours ago.

jade thunder Jun 14, 2021, 5:41 PM

#

what's a cold boot?

faint sparrow Jun 14, 2021, 5:41 PM

#

Using ifconfig on the command line is usually or always temporary.

#

cold boot means you at some point removed all power (5VDC on a raspberry pi).

jade thunder Jun 14, 2021, 5:42 PM

#

Ahh okok

faint sparrow Jun 14, 2021, 5:42 PM

#

cycle power is an equivalent term.

#

Generally you sudo poweroff and wait 'forever' for it to properly shut down.

#

They give you a button at the login window to automate this.

jade thunder Jun 14, 2021, 5:43 PM

#

i see

faint sparrow Jun 14, 2021, 5:43 PM

#

My Raspi 3B takes like 90 seconds to power off. ;)

#

(never clocked it but it's quite a while)

jade thunder Jun 14, 2021, 5:43 PM

#

That's.... really taking forever lmao

faint sparrow Jun 14, 2021, 5:44 PM

#

It's 90 seconds I'll never see again!

jade thunder Jun 14, 2021, 5:45 PM

#

So if I do sudo ifconfig eth0 down, will that allow me to ssh/vnc my raspi wirelessly again?

faint sparrow Jun 14, 2021, 5:45 PM

#

as far as I know it won't affect wireless at all.

#

It'll just shut down the ethernet so that there's only one possible destination in the routing table.

#

(locally)

jade thunder Jun 14, 2021, 5:45 PM

#

but it will help my network routing on my raspi, correct?

faint sparrow Jun 14, 2021, 5:46 PM

#

I'm thinking it'll simplify netstat -rn by exactly one entry. Maybe more.

jade thunder Jun 14, 2021, 5:46 PM

#

I see, ok

faint sparrow Jun 14, 2021, 5:47 PM

#

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 eth0
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0

#

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.1.254   0.0.0.0         UG        0 0          0 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0

#

That's before and after, I'd expect.

jade thunder Jun 14, 2021, 5:48 PM

#

I see, ok

faint sparrow Jun 14, 2021, 5:48 PM

#

Again afaik it's temporary.

#

I do it all the time when I switch over from/to wireless or wired ethernet.

#

I rarely have both up at the same time.

#

I have no real clue what happens when you try to keep both interfaces up (especially on the same subnet).

jade thunder Jun 14, 2021, 5:50 PM

#

Alright, got it

#

I'll give it a try tomorrow, gotta sleep now so i can wake up tomorrow morning for work

faint sparrow Jun 14, 2021, 5:50 PM

#

So much has been ruled out already so this seems likely to help.

#

;)

jade thunder Jun 14, 2021, 5:50 PM

#

Yeah, really thanks a lot @faint sparrow !

faint sparrow Jun 14, 2021, 5:50 PM

#

Okay good luck!

jade thunder Jun 14, 2021, 5:50 PM

#

truly appreciate your help!

faint sparrow Jun 14, 2021, 5:50 PM

#

Glad to be of some help.

solar meteor Jun 14, 2021, 11:41 PM

#

I have a very odd setup i need help with. Can I use the pi4 internal wifi to connect to a network. Then using a wifi dongle, host an ap JUST so I can ssh/VNC in from a device connected to the dongle wifi?

#

(internet) ---- [wlan0]/ [wlan01] ----- ssh/vnc

solar meteor Jun 15, 2021, 12:13 AM

#

also can I get a lead on an arduino or raspberry pi baseball cap? or beanie? Arduino.cc is out of stock 😦

faint sparrow Jun 15, 2021, 12:36 PM

#

@solar meteor Might take some work but I don't know of any reason why not.

#

Raspbian is Debian and as far as I know you can have at least two interfaces; probably three, four or five.

#

(maybe unlimited except by other constraints related to hardware bus issues).

hybrid vortex Jun 15, 2021, 12:44 PM

#

faint sparrow (maybe unlimited except by other constraints related to hardware bus issues).

I believe there is a limitation somewhere in the kernel where interface names can’t go past a certain length, giving a limit but it is high enough that it will never be a concern. Older versions of the kernel had a much lower limit, a couple of hundred I think but due to changing the interface implementation to linked lists that has been resolved. You will run into hardware limitations well before that though, pcie enumeration will have issues with physical devices but virtual devices should be able to go up very high.

faint sparrow Jun 15, 2021, 12:46 PM

#

@hybrid vortex The last kernel upgrade (or a recent one anyway - recent for 'stable' Debian, iirc) added new names for ethernet.

#

So I get something like enp0s22 or like that.

hybrid vortex Jun 15, 2021, 12:48 PM

#

I think it is independent from the naming scheme itself, instead a limitations of no more than 16 bytes for any interface name according to some mailing lists.

faint sparrow Jun 15, 2021, 1:00 PM

#

I know I saw five USB interfaces in 9front.org running on RPi 3B so it's not limited to four of them.

#

And that was with only two USB slots populated, physically.

#

(I don't remember why it was five - the USB keyboard+mouse dongle likely counted as more than a singleton)

#

CP2104 was the fifth. Easily enumerated.

#

You take the manufacturer's code (or whatever that first tuple is) and concatenate the 'serial number' (unique to that instance, established in CP2104 firmware, one supposes) to identify that particular CP2104 from any others you own.

#

(the five-character serial numbers are not even a little similar)

graceful inlet Jun 17, 2021, 2:18 PM

#

https://www.rtl-sdr.com/cariboulite-a-30-6000-mhz-13-bit-4mhz-sdr-hat-for-the-raspberry-pi/

rtl-sdr.com

admin

CaribouLite: A 30-6000 MHz 13-bit 4MHz SDR HAT for the Raspberry Pi

Thank you to David for submitting news about his company Caribou Labs new product called 'CaribouLite' which will be a software defined radio HAT for the Raspberry Pi 4. The product is currently in the pre-launch stage over on Crowd Funding platform CrowdSupply and you can sign up for future updates on the release. David writes: I'd like to info...

#

Software defined radio

meager bay Jun 18, 2021, 3:09 AM

#

Can you execute functions that use the GPIO simultaneously in Python? Let’s say someone wanted to activate a buzzer and an LED at the same time

hardy plaza Jun 18, 2021, 3:13 AM

#

meager bay Can you execute functions that use the GPIO simultaneously in Python? Let’s say ...

If you use two different GPIO pins, one connected to the buzzer, one connected to the LED, certainly.

meager bay Jun 18, 2021, 3:15 AM

#

hardy plaza If you use two different GPIO pins, one connected to the buzzer, one connected t...

What library do you suggest for this

hardy plaza Jun 18, 2021, 3:18 AM

#

meager bay What library do you suggest for this

You don't need a specialised library for the Pi. The RPI.GPIO library is installed by default on the official Raspberry Pi OS (formerly called "Raspbian"). You just import the "rpi.gpio" library and use its API (methods), which is documented on PyPi:
https://pypi.org/project/RPi.GPIO/
https://www.ics.com/blog/control-raspberry-pi-gpio-pins-python

PyPI

RPi.GPIO

A module to control Raspberry Pi GPIO channels

ICS - Integrated Computer Solutions

Control Raspberry Pi GPIO Pins from Python

Here's how to control Raspberry Pi GPIO pins from the Python programming language using Rpi.GPIO and Gpiozero.

#

Basically, you declare a specific pin as either input or output, then get or set the value as either True (1) or False (0).

meager bay Jun 18, 2021, 3:19 AM

#

My functions seem to be running sequentially though

#

How would you run them in parallel 🤔

hardy plaza Jun 18, 2021, 3:20 AM

#

Do they need to be actually at the very same moment (or very close) in time?

#

If you set the buzzer and then set the LED the amount of time between should be extremely small.

meager bay Jun 18, 2021, 3:21 AM

#

hardy plaza Do they need to be actually at the very same moment (or very close) in time?

Yes. I think I will try this 🙂 https://docs.python.org/3/library/multiprocessing.html

#

Thanks!

hardy plaza Jun 18, 2021, 3:22 AM

#

In Python you have Threads, Multiprocessing, and asyncio that allow for multiple processes running at the same time, but any of them are significantly more complicated than what I'd think would be necessary to just turn on a buzzer and an LED.

#

If you instrument your code with print statements (so you can see when things actually run), is there a long lag when turning on the buzzer or LED? That seems strange if it is.

meager bay Jun 18, 2021, 3:23 AM

#

Oops sorry I just gave a very simple example. I actually have a couple devices I want to try and run at the same time

hardy plaza Jun 18, 2021, 3:25 AM

#

Ah, understood. You might want to investigate the differences between threading and multiprocessing in Python as they're different beasts with different characteristics.

#

Have fun!

meager bay Jun 18, 2021, 3:25 AM

#

You're right thank you! Hopefully it goes well 😄

civic cloak Jun 18, 2021, 12:01 PM

#

Hi Guys I've got a Raspberry pi4 and a Adafruit speaker Bonnet Stereo. I would like to get some sound from it but when i follow this tutorial https://learn.adafruit.com/adafruit-speaker-bonnet-for-raspberry-pi/raspberry-pi-usage I get nothing at the end (no sound from the speakers) do you guys have any idea of where the problem could come from ?

Adafruit Learning System

Adafruit Speaker Bonnet for Raspberry Pi

Turn it up!

strange mulch Jun 18, 2021, 3:51 PM

#

Are there any guides on using the raspberry pi with the bluefruit connect app?

primal turtle Jun 20, 2021, 4:12 AM

#

I'm testing my raspberry pi zero w and I'm only seeing 4.5 v on pins 2 and 4 but pin one is a solid 3.3 v

#

it also gets really hot, like too hot to grab when idle...

#

is my pi borked?

primal turtle Jun 20, 2021, 4:35 AM

#

it boots and seems to run just fine, but my standard pi zero gives a solid 5v on the mentioned pins and stays cool running the same sd card on the same power supply.

charred sonnet Jun 20, 2021, 5:37 AM

#

Hi everyone, I have a pi pico and the 16x2 LCD+Keypad Kit for Raspberry Pi

#

I don't really know anything about circuits but it's my understanding that I only need to connect two wires to start programming the LCD? I don't know which ones to connect to on the LCD plate though

#

and I suppose the naive approach would be to compare a GPIO pinout from a pi 3/4 to my pico and then connect it the same way?

charred sonnet Jun 20, 2021, 6:28 AM

#

I actually bought the kit for the pi 1/2, maybe it would be best to desolder the LCD from the kit and use it as a normal LCD

primal turtle Jun 20, 2021, 2:59 PM

#

@charred sonnet send me a link to the kit, i'll see if I can help you

charred sonnet Jun 20, 2021, 4:20 PM

#

@primal turtle https://www.adafruit.com/product/1110

Adafruit RGB Negative 16x2 LCD+Keypad Kit for Raspberry Pi

This new Adafruit Pi Plate makes it easy to use an RGB 16x2 Character LCD. We really like the RGB Character LCDs we stock in the shop. (For RGB we have RGB negative and RGB positive.) ...

primal turtle Jun 20, 2021, 5:04 PM

#

@charred sonnet it is using i2c so if you use probably any of adafruit's i2c lcd libraries connected to the i2c pinson the kit you'll be able to control it. Also its using a gpio expander that is also i2c so those 2 pins should be able to do it all. With any mcu or sbc

charred sonnet Jun 20, 2021, 5:13 PM

#

So is it just pick any pins and then make sure the code it going to the same pins?

#

and thank you for looking

hardy plaza Jun 20, 2021, 8:16 PM

#

charred sonnet So is it just pick any pins and then make sure the code it going to the same pin...

It would help to do a bit of reading about the I2C bus. It's two pins, SDA and SCL (plus power and ground for a total of four) that as a bus allow you to connect dozens of I2C devices, each with a unique address. Each device just needs those two pins, SDA and SCL, to communicate.

charred sonnet Jun 20, 2021, 8:55 PM

#

@hardy plaza thanks, looking through some info about it now

#

my brother went to school for EE stuff and he said he'd take a look too, probably shoulda started there 😛

pliant pebble Jun 22, 2021, 4:53 AM

#

Is there any files for a good 3D printable laptop?

turbid rivet Jun 22, 2021, 12:59 PM

#

pliant pebble Is there any files for a good 3D printable laptop?

There are a large number of raspi laptop stls on thingiverse, but the vast majority of them are for 7" screens. If you are using a recycled laptop screen, I would recommend designing your own to fit your screen and driver board.

pliant pebble Jun 22, 2021, 4:44 PM

#

turbid rivet There are a large number of raspi laptop stls on thingiverse, but the vast major...

I already started. Thanks!

raw solar Jun 22, 2021, 9:41 PM

#

I recommend getting hinges from old laptop screens [or a screen with hinges] -- makes your life easier insofar that you don't need to design a hinge or anything like that

wooden blade Jun 23, 2021, 12:09 PM

#

gday all,

#

recently purchased the raspberry pi stepper bonnet, ive got it running on the test code provided and undertsand the forward and back steps provided, i cant seem to find documentation on other code like moving angles or positions? does this exist

frigid moth Jun 23, 2021, 1:16 PM

#

Hello! I'm trying to run a python script on startup of my Raspberry Pi Zero W. I updated crontab to run the script on @reboot. When I ssh into it after a reboot and run ps aux | grep main.py I get this line: pi 530 0.0 0.4 7332 1812 pts/0 S+ 14:14 0:00 grep --color=auto main.py

main.py is colored red. Does this mean it can't find a process that is named main.py? The script is a bot that runs infinitely.

Here's what I added to the crontab - @reboot python3 /home/pi/main.py &

Running that exact command when I ssh into the pi works.

safe laurel Jun 23, 2021, 1:19 PM

#

Being colored red is just grep being helpful and highlighting the string you are looking for

#

it is showing up in that line because the grep command is just searching for the string main.py anywhere in the line and is finding itself

frigid moth Jun 23, 2021, 1:20 PM

#

ah darn. So my script isn't running

#

I am seeing a few ways to run scripts on startup. Is there a particular one that works best?

#

So far I've tried rc.local and now crontab with no luck.

safe laurel Jun 23, 2021, 1:24 PM

#

I'd probably use the "systemd" method: https://www.dexterindustries.com/howto/run-a-program-on-your-raspberry-pi-at-startup/#systemd

Dexter Industries

John

Five Ways to Run a Program On Your Raspberry Pi At Startup

In this tutorial we show you five ways you can run a program on your Raspberry Pi at startup. We show you five ways to start a program at Raspberry Pi boot.

#

Although you should add a User=pi and Group=pi to the [Service] section

frigid moth Jun 23, 2021, 1:36 PM

#

Wasn't able to get systemd to work either. Doesn't even spit out a log file for me. Here's my service file

#

Description=Bot Runner Service
After=multi-user.target

[Service]
Type=idle
ExecStart=/usr/bin/python3 /home/pi/main.py > /home/pi/logs/bot.service.log 2>&1
User=pi
Group=pi

[Install]
WantedBy=multi-user.target```

safe laurel Jun 23, 2021, 1:45 PM

#

did you enable it?

frigid moth Jun 23, 2021, 1:51 PM

#

yep

#

Using this command sudo systemctl enable my-bot.service

#

my-bot.service is what I named the service

#

Ah I see. The service failed

#

It didn't even spit out the log file for me to understand why it failed though

#

The only reason I know it failed is because I listed all enabled services

safe laurel Jun 23, 2021, 1:55 PM

#

check /var/log/messages?

frigid moth Jun 23, 2021, 2:09 PM

#

Just checked. Nothing there either.

#

Ayyyy! I got it to work. The systemd was the right way to go since my script actually needs the network to run. I had to add Wants = network-online.target After = network.target network-online.target

frigid moth Jun 23, 2021, 2:15 PM

#

safe laurel check /var/log/messages?

Thanks for your help! I learned a ton.

frigid moth Jun 23, 2021, 2:32 PM

#

Just kidding, i didn't get it to work yet. But I think I made a good step forward.

hardy plaza Jun 23, 2021, 8:18 PM

#

frigid moth Just kidding, i didn't get it to work yet. But I think I made a good step forwar...

Check out the comments in:
https://github.com/ifurusato/letterbox-robot/blob/main/lbrd.service
which controls this script via systemd:
https://github.com/ifurusato/letterbox-robot/blob/main/lbrd.py

iron zodiac Jun 24, 2021, 10:19 AM

#

I just got some stepper motors working with my rpi, i then wanted to use the LSM303DLH compass + accel sensor at the same time which needed circuitpython. Having installed circuit python, the stepper motors no longer work correctly; instead of spinning, they seem to change direction very quickly as well as gain and loose power. I feel like installing circuitpython has somehow messed up the gpio outputs in the program to control the stepper motors, or it has started running something in the background which is writing random values to the gpio pins, does anyone have any idea whats going on here? Is it possible to disable circuit python to see if that gets the steppers working again?

turbid rivet Jun 24, 2021, 11:09 AM

#

Steppers are known to be quite finicky with timing, which is usually why their control is left to microcontrollers and/or stepper drivers. The more things you have running on RPi, the more likely it'll cause issues with speed and direction control.

#

If you are driving these steppers directly with Raspi, you'll probably see these issues with any additional multitasking, regardless of circuit python.

wraith grove Jun 24, 2021, 11:43 AM

#

some things aren't multithreaded, the pi has 4 cores

turbid rivet Jun 24, 2021, 11:49 AM

#

Fair, then next problem with circuit python is its interpreted, and Idk what adverse effects that can have on timing.

west glade Jun 24, 2021, 11:53 AM

#

Hey, I think the connector on my official Pi 4 fan is too long, and the case won’t close. (from https://www.adafruit.com/product/4794 ) Any recommendations? Maybe an upgrade pick for a Pi 4 fan?

Official Raspberry Pi 4 Case Fan and Heatsink

The Raspberry Pi 4 Case Fan + Heatsink is compatible with the Raspberry Pi 4 and the Raspberry Pi 4 Case. Designed for anyone who wants to push the performance of their Pi, as well as ...

turbid rivet Jun 24, 2021, 12:22 PM

#

west glade Hey, I think the connector on my official Pi 4 fan is too long, and the case won...

Are you looking to upgrade the fan, the case, or both?

west glade Jun 24, 2021, 12:23 PM

#

turbid rivet Are you looking to upgrade the fan, the case, or both?

None sound like bad options! Say a $20 budget. Probably can get away with just a new fan though.

turbid rivet Jun 24, 2021, 12:26 PM

#

Well, at 25 you'll get one of these: https://www.adafruit.com/product/4340 heh

Aluminum Metal Heatsink Raspberry Pi 4 Case with Dual Fans

Looking for a way to keep your Raspberry Pi 4 running cool and also look cool? We've got a two-birds-one-stone solution for you. This enclosure kit is absolutely perfect, ...

#

I'm assuming you don't touch the GPIO pins much if you current case is kinda in the way of your fan pins, so maybe this guy might fit in your case? https://www.adafruit.com/product/4316

Pimoroni Fan SHIM for Raspberry Pi

Looking for another way to keep your Raspberry Pi cool? Hook up Pimoroni's miniature 5V Fan SHIM and prevent your hard-working Pi from overheating! It'll keep your Pi ...

#

And if none of these appeal to you, maybe you can take a file and wear down the problem edges of the DuPont connector on your own. The fan will still work, I promise.

#

Oh, and the case pictured in the fan shim page is https://www.adafruit.com/product/4318 if you happen to like the look.

Rainbow Pibow Coupé 4 for Raspberry Pi 4

What's that you say? You just received your new Raspberry Pi 4 in the mail and want to get a new colorful case? Well, you are in luck! We now have this new slim, hackable, and ...

west glade Jun 24, 2021, 12:38 PM

#

turbid rivet And if none of these appeal to you, maybe you can take a file and wear down the ...

I'm obliged to try this first. Then I'd have an excuse to shop more. ...but that aluminum case, wow! Thank you Hem 🙂 🙏

turbid rivet Jun 24, 2021, 12:39 PM

#

No problem. Adafruit has a whole subcategory dedicated to Pi4 cases, so took no time at all!

iron zodiac Jun 24, 2021, 1:59 PM

#

turbid rivet Steppers are known to be quite finicky with timing, which is usually why their c...

The weird bit is that it worked fine before installing circuit python, afterwards the steppers are now doing random stuff and nothing I do seems to prevent it. As far as i'm aware i'm not even using circuit python in my code yet installing it was what caused the issue. Does it automatically run something in the background that I don't know about which could cause this? Failing all else I can just put a clean install on the sd and avoid installing circuit python but this seem a little extreme

turbid rivet Jun 24, 2021, 2:05 PM

#

Are they directly connected to your Pi? If you pins can't be held high, it could be current draw on the steppers, but if they can't be held low and free-spinning, something might be wrong with your pins. If you can revert to your last known working state and make sure it works properly, you can cross off hardware issues...

#

Though in my experience, you should not be running steppers directly off of any GPIO pin because their current draw is not something GPIO pins are typically rated for...

iron zodiac Jun 24, 2021, 2:23 PM

#

They aren't directly connected. I'm using a Stepper Motor HAT with a 12v power supply (with plenty of current) which uses a pair of DRV8825 to drive the motors. I'm very confident that it is not a hardware issue; the motors worked flawlessly before installing circuit python, the only different before and after breaking is that i typed some stuff into the terminal to install circuit python. The steppers seem to rapidly switch between free spinning and powered - there is a pair of gpio pins which control whether or not the motor is powered, so it is as if these pins are both getting random outputs whenever my code sets them to an output state of 1. Its a similar situation for the direction; there is a pair of pins which control the direction, and the rapid changing of direction could be explained by these pins getting random output settings. I suppose the next thing to try would be running the pi off a clean sd and see if it works fine again

gentle briar Jun 24, 2021, 2:26 PM

#

I wonder if it's something like the pin numbering got changed (board vs BCM for instance)

iron zodiac Jun 24, 2021, 2:30 PM

#

I always run GPIO.setmode(GPIO.BCM) before setting up the pins. Would it still be possible for it to be using the wrong numberings?

turbid rivet Jun 24, 2021, 3:49 PM

#

Honestly, I don't know specifics when it comes to software, I'm mostly a hardware engineer at this point. If you don't have an oscilloscope / logic analyzer to investigate it further Idk how I can help further haha

gentle briar Jun 24, 2021, 4:05 PM

#

That setmode() command should cover that possibility, but unfortunately that's the only one I thought of.

iron zodiac Jun 24, 2021, 5:24 PM

#

Alright, thanks for the help, ill keep fiddling about with it and see if i can get to the bottom of things

tiny raft Jun 24, 2021, 9:41 PM

#

So i dragged my pi3 out after a few years. I wanted to operate headless and found webide. I have been struggling with getting it working via the tut on the website. after digging a little i learned about the pifinder app and that it supports installing webide. it finds the rpi but errors on the bootstrap with no such repository. i am in the middle of wiping and reinstalling/updating the os, but i thought id check here and see if pifinder and or webide are dead apps, and if not, am i missing something.

primal turtle Jun 26, 2021, 12:30 AM

#

does anyone know if they changed the silk screening on the back of the pi zero w since it's release?

civic cloak Jun 26, 2021, 9:48 AM

#

Hi why can we not use Adafruit NeoPixel on other Raspberry GPIO than 10 12 18 and 21 ?

#

https://learn.adafruit.com/neopixels-on-raspberry-pi/raspberry-pi-wiring

Adafruit Learning System

NeoPixels on Raspberry Pi

How to control NeoPixel LEDs with Python on a Raspberry Pi!

civic cloak Jun 26, 2021, 10:50 AM

#

any idea <@&617066238840930324> ?

gentle briar Jun 26, 2021, 11:31 AM

#

Those might be the pins that PWM0 can be mapped to.

cold monolith Jun 26, 2021, 7:46 PM

#

civic cloak any idea <@&617066238840930324> ?

@gentle briar was on the money, can use a PWM, PCM, or SPI controller https://github.com/jgarff/rpi_ws281x

GitHub

jgarff/rpi_ws281x

Userspace Raspberry Pi PWM library for WS281X LEDs - jgarff/rpi_ws281x

#

Which, matches with the pin numbers you gave https://pinout.xyz

Raspberry Pi GPIO Pinout

The comprehensive add-on boards & GPIO Pinout guide for the Raspberry Pi

marble trout Jun 26, 2021, 7:54 PM

#

hey yall, what should i do if one of the bonnets i ordered arrived broken? the joystick doesn't work in the up direction

gentle briar Jun 26, 2021, 8:09 PM

#

Email support@adafruit.com

steady rose Jun 26, 2021, 9:00 PM

#

@marble trout please post in the forums:
https://forums.adafruit.com/
so we can try and troubleshoot first.

marble trout Jun 26, 2021, 9:02 PM

#

steady rose <@!491055462004031491> please post in the forums: <https://forums.adafruit.com/>...

Ok thank you. If feels like a physical issue tho. Like the switch doesn't click when pushed in the up direction

steady rose Jun 26, 2021, 9:04 PM

#

ok. could be a bad switch. you can try emailing support, but they may ask the same about forums.

#

it's the general process (1) forums to try and troubleshoot then (2) email support as needed based on outcome

meager bay Jun 27, 2021, 10:31 PM

#

Hello has anybody encountered this before? I'm connected to my Pi via Windows' Remote Desktop Connection (xrdp), and every time I run my PySimpleGUI script as sudo python3 gui.py I get this error about the display:

gentle briar Jun 27, 2021, 11:04 PM

#

That looks to me like an X11 error. It could well be that you're not running X11 at all, so there's no X display for it to connect to, but I'm guessing a bit.

timber marten Jun 27, 2021, 11:10 PM

#

can you make it where you dont need a mini hdmi to display the raspberry pi zero w?

#

like is it posible to do it?

gentle briar Jun 27, 2021, 11:13 PM

#

If you want HDMI video, you're pretty much stuck with the connector that's present. However, if you don't insist on HDMI, you can get composite video from a Pi Zero fairly easily.

timber marten Jun 27, 2021, 11:13 PM

#

so you dont need the mini hdmi to display like can you do it on phone or chromebook?

raw solar Jun 27, 2021, 11:14 PM

#

You can use VNC to remote in graphically or SSH for console

timber marten Jun 27, 2021, 11:14 PM

#

i do need help tho does it need a network ip to finnd it or somthing to remote?

raw solar Jun 27, 2021, 11:15 PM

#

Yes, you need the IP or the hostname. You can set the name with raspi-config and find the IP with ifconfig

timber marten Jun 27, 2021, 11:16 PM

#

im on chromebook not pc tho

#

thats the thing'

meager bay Jun 27, 2021, 11:16 PM

#

gentle briar That looks to me like an X11 error. It could well be that you're not running X1...

Been scratching my head at this for a while now 😢

raw solar Jun 27, 2021, 11:16 PM

#

Oh wait, are you looking to set up without connecting a display?

timber marten Jun 27, 2021, 11:17 PM

#

no i already have the files on a sd card into the raspberry pi but i wanna display it

#

i couldnt afford the mini hdmi adater

raw solar Jun 27, 2021, 11:18 PM

#

Ahh... I think you can set a hostname in the boot.conf on the card...

timber marten Jun 27, 2021, 11:18 PM

#

how would i do that

raw solar Jun 27, 2021, 11:21 PM

#

I can't recall, anybody else remember? I haven't had to do this in ages

timber marten Jun 27, 2021, 11:25 PM

#

i dont think anyone els knows'

spiral mason Jun 28, 2021, 5:26 AM

#

You should search for headleass setup raspi. But that envolves mounting the sd card on another machine. Not sure what Chromebook allows you.

hardy plaza Jun 28, 2021, 10:57 AM

#

raw solar Ahh... I think you can set a hostname in the boot.conf on the card...

Are you guys trying to set the hostname on a Pi or on a Chromebook?

#

On a Pi it's just using raspi-config.

raw solar Jun 28, 2021, 11:42 AM

#

hardy plaza Are you guys trying to set the hostname on a Pi or on a Chromebook?

They're trying to set up a Pi headless -- they don't have a monitor to even do initial setup, so they'd need to configure entirely via the Chromebook and then connect over the network

#

I didn't think about it last night but that requires setting the hostname and network info

#

Or at least network info, you can scan for it with an app...

#

I know you can do it, but I forget because I always have a display

hardy plaza Jun 28, 2021, 11:44 AM

#

raw solar I know you can do it, but I forget because I always have a display

yeah, me too. But if they look into two of the files in /boot they'll find the configs. This is all documented on the RPi site somewhere...

raw solar Jun 28, 2021, 11:45 AM

#

Somewhere... I had trouble finding it

hardy plaza Jun 28, 2021, 11:45 AM

#

I usually just connect an HDMI monitor to the Pi for its first 15 minutes of life, then never again.

raw solar Jun 28, 2021, 11:46 AM

#

Lol, yeah, that's most of mine

hardy plaza Jun 28, 2021, 11:52 AM

#

off to bed, cya

raw solar Jun 28, 2021, 12:09 PM

#

Night

vocal lava Jun 28, 2021, 6:47 PM

#

Is it normal in Raspbian that I have to use sudo to run a Python file with gpiozero on my Raspberry Pi 2? If I don't use sudo, gpiozero errors out that it can't communicate with the pins.

vocal lava Jun 28, 2021, 7:16 PM

#

Oops, shame on me. Should have read the docs better, it's a virtual environment thing

#

nevermind me. 🙂

pliant pebble Jun 29, 2021, 3:34 AM

#

How do you find the Pi chip's stats/usage on the Pi - command line is preferable??

opaque wagon Jun 29, 2021, 4:01 AM

#

htop or top will show a "task manager" in the terminal.

#

I also believe uptime will show the CPU usage average

spiral mason Jun 29, 2021, 12:10 PM

#

or did you mean stuff like

#

cat /proc/cpuinfo
echo $[100-$(vmstat 1 2|tail -1|awk '{print $15}')]

#

?

pliant pebble Jun 29, 2021, 5:47 PM

#

opaque wagon `htop` or `top` will show a "task manager" in the terminal.

OK, thanks!

pliant pebble Jun 29, 2021, 5:47 PM

#

spiral mason cat /proc/cpuinfo echo $[100-$(vmstat 1 2|tail -1|awk '{print $15}')]

No

#

Firefox is much faster than Chromium on Raspberry Pi....

#

Chromium broke for me, so I was just saying....

#

Has Chromium broken for anyone else?

faint sparrow Jun 29, 2021, 8:02 PM

#

raw solar I didn't think about it last night but that requires setting the hostname *and* ...

Article for a headless Pi setup.
https://learn.adafruit.com/raspberry-pi-computer-quick-start
https://learn.adafruit.com/raspberry-pi-zero-creation/text-file-editing

Adafruit Learning System

Raspberry Pi Computer Quick-Start

Get your Pi in shape and ready to do cool stuff!

Adafruit Learning System

Raspberry Pi Zero Headless Quick Start

Give your Pi Zero or Zero W the spark of new life.

mint pagoda Jun 29, 2021, 9:22 PM

#

@raw solar The latest change to the Rasberry Pi Imager allows you to set the network and other things while putting the os on the card. Just do a CTRL-SHIFT-X.

vivid grail Jun 30, 2021, 12:09 AM

#

pliant pebble Has Chromium broken for anyone else?

It didn't break for me. But that was a month or two ago, and i didn't use it for long

pliant pebble Jun 30, 2021, 1:36 AM

#

vivid grail It didn't break for me. But that was a month or two ago, and i didn't use it fo...

Hmm. OK.

raw solar Jun 30, 2021, 2:29 AM

#

mint pagoda <@!381566293368897537> The latest change to the Rasberry Pi Imager allows you to...

Ah, cool! Here you go @timber marten !

#

Customization right in the imager!

mint pagoda Jun 30, 2021, 2:33 AM

#

Since sliced bread 😎

eternal sparrow Jun 30, 2021, 3:48 AM

#

mint pagoda <@!381566293368897537> The latest change to the Rasberry Pi Imager allows you to...

the eletrical socket has the power to give u a bad head ache as a kid, if u did it wrong

fickle storm Jun 30, 2021, 4:33 PM

#

hello, can i ask about how using multiple sensor INA219 with Raspberry Pi?

steady rose Jun 30, 2021, 4:55 PM

#

yes. this board?
https://www.adafruit.com/product/904

#

answered in #help-with-circuitpython . please don't post questions in multiple channels. if in doubt which channel, just make best guess.

vocal lava Jun 30, 2021, 7:31 PM

#

What is the usual preferred library in Python to use GPIO? gpizero or or rpi.gpio?

hardy plaza Jun 30, 2021, 8:40 PM

#

vocal lava What is the usual preferred library in Python to use GPIO? gpizero or or rpi.gp...

https://www.raspberrypi.org/forums/viewtopic.php?t=204466#p1268675

#

In a nutshell, gpiozero is a higher level API over the same functions as rpi.gpio. If you're comfortable with gpiozero use it, if you want access to a more detailed API use rpi.gpio. They do exactly the same thing in the end, just a flavour of syntax.

vocal lava Jun 30, 2021, 8:42 PM

#

@hardy plaza Thanks!

royal crypt Jun 30, 2021, 8:54 PM

#

I just got my CM4 IO Board, and I think there is an issue with it.

#

The Ethernet port worked when I first ran Ubuntu, but after updating, it no longer does. I also saw some solder smoke come off the board, so I think it is toasted.

normal vapor Jul 1, 2021, 12:52 AM

#

F

hazy matrix Jul 1, 2021, 2:00 AM

#

I was planning on getting the Rasberry Pi 4 model B, with 2 GB of ram, but it is out of stock. when will it be back in stock?

opaque wagon Jul 1, 2021, 2:07 AM

#

hazy matrix I was planning on getting the Rasberry Pi 4 model B, with 2 GB of ram, but it is...

afaik adafruit doesn't usually say how long it takes until something is in stock so you gonna have to sign up for (email) notification once it's back in stock

remote cove Jul 2, 2021, 3:28 PM

#

I used to program the Adafruit Feather M0 with python (I used mu but I don't think that's too important). I use a raspberry pi. As I ran out of ram more often I wanted to switch to C. So, I downloaded the Adruino IDE and wrote a small blinking script. I played it on the microcontroller and it works. Problem is that since then the raspberry pi doesn't recognize the microcontroller when I plug it in. I can't program it with python or with c. Can you help? (pls ping)

gentle briar Jul 2, 2021, 3:33 PM

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There's a nice writeup here on various ways to enter the bootloader so the Pi can see it. https://learn.adafruit.com/adafruit-trinket-m0-circuitpython-arduino/uf2-bootloader-details

Adafruit Learning System

Adafruit Trinket M0

CircuitPython or Arduino IDE on this tiny little microcontroller board

indigo shore Jul 2, 2021, 3:56 PM

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Is it possible to take 299 pixel x 299 pixel images with the Raspi Camera Module V2?

remote cove Jul 2, 2021, 4:02 PM

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When my raspberry Pi freezes but I have some import unsaved files, how long should I wait for it to un-freeze before I pull the power supply?

steady rose Jul 2, 2021, 4:06 PM

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@indigo shore scaled down from full frame? or a 299x299 pixel subframe?

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@remote cove what is nature of freeze? the GUI locks up? your ssh session feezes? other?

remote cove Jul 2, 2021, 4:09 PM

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steady rose <@!526365510267568151> what is nature of freeze? the GUI locks up? your ssh sess...

I guess it's a GUI problem. Had 3 tabs open and opened 2 more at the same time. I can't move my mouse and nothing moves. the picture remains still

steady rose Jul 2, 2021, 4:10 PM

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hmmm. so you have a monitor and keyboard attached?

remote cove Jul 2, 2021, 4:10 PM

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steady rose hmmm. so you have a monitor and keyboard attached?

And a mouse. (At the time of the freeze there also was a microcontroller attached)

steady rose Jul 2, 2021, 4:11 PM

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is green ACT LED doing anything?

remote cove Jul 2, 2021, 4:12 PM

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It's blinking from time to time

steady rose Jul 2, 2021, 4:12 PM

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have you tried pinging the pi from another machine?

remote cove Jul 2, 2021, 4:13 PM

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How?

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I've never done that

steady rose Jul 2, 2021, 4:16 PM

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ok. maybe not a good option then. it's just a simple command, but you'd need to know the address, or try to use the mdns approach.

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is keyboard also frozen?

indigo shore Jul 2, 2021, 4:16 PM

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@steady rose A subframe would be best (if I understand the question/terminology). I'm building a contraption that will take a whole bunch of pictures for use with an AI architecture (Inception v3) that prefers 299 x 299 square images.

remote cove Jul 2, 2021, 4:18 PM

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steady rose is keyboard also frozen?

Wdym how can a keyboard be frozen?

steady rose Jul 2, 2021, 4:18 PM

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@indigo shore subframe = pixel per pixel capture. so you'd only get back 299x299 pixels of the much larger 3280 x 2464 sensor.

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vs. a resize = like a photoshop scaling / cropping of full sensor image

indigo shore Jul 2, 2021, 4:21 PM

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Nice! So I will likely be able to use the same settings to take pictures that will be used in classifying the images. The training dataset will be very similar to the images being classified!

steady rose Jul 2, 2021, 4:21 PM

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@remote cove typing on it doesn't do anything? and maybe try something like window key to bring up a menu. can try <alt><tab> also - i think that will cycle thru open apps. or even num lock and see if light toggles.

remote cove Jul 2, 2021, 4:22 PM

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Ok .now something changed. I can see a overlay telling me that chromium doesn't respond and it asks me if I want to close it but I can't say yes because when I type anything or move the mouse nothing happens

steady rose Jul 2, 2021, 4:23 PM

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@indigo shore the main reason for a subframe would be to reduce the amount of data flow and potentially increase frame rate. do you have a high frame rate requirement? otherwise, just take full images and scale them. the pi's GPU can do that.

remote cove Jul 2, 2021, 4:23 PM

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steady rose <@!526365510267568151> typing on it doesn't do anything? and maybe try something...

Typing doesn't do anything. I'm pretty shure that the raspPi is too slow to process/ to change anything on the screen

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Btw what does the green led indicate? I believe it has something to do with the memory?

steady rose Jul 2, 2021, 4:25 PM

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@remote cove some chromium process is probably hogging the cpu. and even slowing down keyboard reading. is the "YES" button the default option in the dialog you got?

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green led = activity

remote cove Jul 2, 2021, 4:27 PM

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steady rose <@!526365510267568151> some chromium process is probably hogging the cpu. and ev...

No. It was to the right so I tried to press the right key. Also an the moment the popup isn't there anymore

steady rose Jul 2, 2021, 4:28 PM

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is the chromium still active? does it have focus? i.e. - is it what is currently selected to take in keyboard input? (vs. some other open application)

remote cove Jul 2, 2021, 4:28 PM

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steady rose is the chromium still active? does it have focus? i.e. - is it what is currently...

Yes , yes

steady rose Jul 2, 2021, 4:29 PM

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try <ALT><F4> and wait a bit and see what happens

remote cove Jul 2, 2021, 4:29 PM

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remote cove Jul 2, 2021, 4:29 PM

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steady rose try <ALT><F4> and wait a bit and see what happens

Ok

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How long should I wait? To redo the document would take around 10 minutes, but i don't know the chances of the raspPi un-freezing. Do you know how likely it is?

indigo shore Jul 2, 2021, 4:32 PM

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@steady rose No frame rate issues -- still photos. I'd rather crop than scale so as to maintain the images' detail.

steady rose Jul 2, 2021, 4:33 PM

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@indigo shore if you're working in python, this is an excellent library:
https://picamera.readthedocs.io/en/release-1.13/index.html

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pair that with PIL/pillow and you can pretty much do anything

indigo shore Jul 2, 2021, 4:35 PM

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@steady rose Wow! mind reader... I was just going to ask if you had a link... was having trouble finding info on subframes

steady rose Jul 2, 2021, 4:38 PM

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@remote cove wait 10's of seconds. but not more than a minute i guess. but if the runaway process has grown, it may be totally rendering the gui non-responsive. and maybe the pi in general.

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chromium causing this is probably not too surprising

indigo shore Jul 2, 2021, 4:39 PM

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Wow! again. It appears that I can save to numpy arrays with a designated resolution. That might be perfect.

steady rose Jul 2, 2021, 4:40 PM

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yep. there's some great low level hardware info in that readme also.

remote cove Jul 2, 2021, 4:40 PM

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So I restarted the raspPi after 2 minutes of waiting. I need to do my work again 😦

steady rose Jul 2, 2021, 4:42 PM

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@remote cove have a terminal window open running top so you can watch what process was causing the issue. and maybe another so you could try kill -9 ing it.

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not sure if pi has other tty's created you could <CTRL><ALT><Fx> to?

wintry steeple Jul 3, 2021, 7:57 AM

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does anyone know a way for me to send vl53l0x sensor data over from a raspberry pi zero to PC via bluetooth and run a script on PC?

hardy plaza Jul 3, 2021, 8:21 AM

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wintry steeple does anyone know a way for me to send vl53l0x sensor data over from a raspberry ...

I can do it via HTTP but I don't know how to on Bluetooth. Why Bluetooth? It has shorter range and slower performance. No WiFi available?

wintry steeple Jul 3, 2021, 8:23 AM

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hardy plaza I can do it via HTTP but I don't know how to on Bluetooth. Why Bluetooth? It has...

the wifi is needed to connect to my tello drone so its not available. so right now i am trying to find a way for me to get TOF sensor data from raspberry pi zero to pc via bluetooth so i can run the script to the tello drone

hardy plaza Jul 3, 2021, 8:25 AM

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wintry steeple the wifi is needed to connect to my tello drone so its not available. so right n...

Why can' t you use WiFi for both the Tello drone and your PC? I.e., everything via WiFi? I don't think bandwidth would be an issue...

wintry steeple Jul 3, 2021, 8:29 AM

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hardy plaza Why can' t you use WiFi for both the Tello drone and your PC? I.e., everything v...

i need to run a script on my PC to Tello drone API via WiFi, so i cant connect to my raspberry pi zero to my PC WiFi, which prevents me from getting my TOF sensor data

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so im trying to think of a way to connect my PiZero to my PC via Bluetooth and get the sensor data and implement the data to the script

hardy plaza Jul 3, 2021, 8:34 AM

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wintry steeple so im trying to think of a way to connect my PiZero to my PC via Bluetooth and g...

I guess I'm unclear why you can't do both. A Raspberry Pi is a multi-user, multi-process Linux computer. You can run a script to create the drone connection as well as getting the VL53L0X sensor data from the sensor, and connect via HTTP (create a single endpoint of a RESTful web service) to your PC. They can all be running simultaneously. I just did "ps -A | wc -l" and my Pi is currently running 127 processes.

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You'd just be creating a few more...

wintry steeple Jul 3, 2021, 8:36 AM

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hardy plaza I guess I'm unclear why you can't do both. A Raspberry Pi is a multi-user, multi...

the script i run on my PC is a object detection script that requires my GPU for calculation and run on the Tello drone via WiFi

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so i am sure if that method will work

hardy plaza Jul 3, 2021, 8:37 AM

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Well, your computers (PC and Pi) can run multiple processes (they always do) and can make multiple connections over WiFi, all at the same time. It's not like the computer is only running one script, it can run many.

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I guess my point is that using Bluetooth rather than WiFi doesn't gain you anything. If you can figure out how to communicate over HTTP it's probably easier than doing it over Bluetooth.

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In any case, I'm sorry I've got to take care of some business here at home, good luck!

wintry steeple Jul 3, 2021, 8:40 AM

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hardy plaza Well, your computers (PC and Pi) can run multiple processes (they always do) and...

i will try looking into thanks!

steady rose Jul 3, 2021, 10:00 PM

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Anyone know with busio if it's possible to tell it to ignore the MISO pin? As in, not initialise it? My LCD on my rPI has no MISO pin, so I am using that IO for something else, when when I init SPI, it takes control of that pin anyway and messes with it.

steady rose Jul 4, 2021, 12:53 AM

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should be optional

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https://circuitpython.readthedocs.io/en/6.3.x/shared-bindings/busio/index.html#busio.SPI

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blinka also i think
https://github.com/adafruit/Adafruit_Blinka/blob/a79eb436569f2c4d1390571eba5779fc5aedf6db/src/busio.py#L268

limpid hawk Jul 5, 2021, 1:52 PM

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I'm looking at making my 3b+ into a smart display

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I just want something laid out that I could run with big buttons that could still run on raspbian so I can use that as a base and have big buttons like a smart device

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Idk how to go about starting

chrome wasp Jul 5, 2021, 1:55 PM

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The first step is to take a step. Break the project into workable pieces and choose one to begin on.

limpid hawk Jul 5, 2021, 1:56 PM

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The step would be knowijg how to make raspbian or similar into a os that has a bunch of big shortcut buttons

chrome wasp Jul 5, 2021, 1:59 PM

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There have to be hundreds of UI libraries. One of them should be able to give you big buttons

limpid hawk Jul 5, 2021, 2:03 PM

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What site do I go on to get these elements

night marsh Jul 5, 2021, 3:09 PM

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can anyone help me out with this ?
https://github.com/adafruit/Raspberry-Pi-Installer-Scripts/issues/183

GitHub

Unable to run this on db410c · Issue #183 · adafruit/Raspberry-Pi-I...

running this Raspberry-Pi-Installer-Scripts/blob/main/libgpiod.sh script gives me the following error ` Installing build requirements - this may take a few minutes! Hit:1 http://deb.debian.org/debi...

wintry steeple Jul 6, 2021, 7:43 AM

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does anyone know how do i send vl53l0x sensor data from raspberry pi to windows PC with pycharm via bluetooth?

torn trench Jul 6, 2021, 7:50 AM

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isn't pycharm an IDE?

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and when you say "raspberry pi", I am assuming you mean a full fledged raspberry pi microcomputer, not the pico microcontroller?

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I suggest you break this down into two problems. First, get the rpi to print data from the vl53IOx to the terminal. The fastest way to do this would probably to try and run the circuitpython code on Linux. I used this tutorial the other day to run the seesaw circuit python code an an rpi zero w: https://learn.adafruit.com/circuitpython-on-raspberrypi-linux

Adafruit Learning System

CircuitPython on Linux and Raspberry Pi

Make hardware and interface with sensors super easy using CircuitPython

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The second part of the problem is bluetooth communication. I haven't done a lot with it, but I believe it's possible to treat like a UART (serial connection).

wintry steeple Jul 6, 2021, 8:03 AM

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torn trench The second part of the problem is bluetooth communication. I haven't done a lot ...

for the bluetooth communication do u have some examples? thnaks

torn trench Jul 6, 2021, 8:07 AM

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I've never used it, so I don't have any examples I can really endorse. But I read this the other day: https://www.raspberrypi.org/documentation/configuration/uart.md

UART configuration - Raspberry Pi Documentation

Documentation in this section includes basic guides to configuring your Raspberry Pi.

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which suggests that the secondary UART on raspberry pi devices (/dev/serial1) is hooked up to bluetooth

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so I believe on the pi side, it may be as simple as forming a bluetooth connection to your laptop, and then sending data to /dev/serial1. I am not really sure how to get the other end of the UART up on your laptop though

spiral mason Jul 6, 2021, 3:49 PM

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Why don't you put them both in a wlan/Network and post the data to the windows pc ? Or use some Webfrontend on the pi ?

quartz tusk Jul 7, 2021, 5:22 PM

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Hello all, I have a few questions regarding my raspberry pi zero. I am attempting to record accelerometer data (adxl343) and microphone data (Bluetooth) at the same time. Is this possible to do with the Zero or will I need something with more computing power?

hardy plaza Jul 7, 2021, 6:55 PM

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quartz tusk Hello all, I have a few questions regarding my raspberry pi zero. I am attemptin...

A Pi Zero is a Linux computer so being able to run multiple processes at the same time is no issue. That will really depend on the data density/throughput of both sources, like how often the accelerometer is getting updated, the quality of the audio and the overhead for Bluetooth processing. But I'd say try it out, and if that doesn't work you could move up to a Pi 3 A+, which is still pretty small but has four cores (the Pi Zero has only one). But the Pi Zero is still a pretty capable machine, so I'd say give it a go, it probably can handle it.

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I'd actually be curious to hear if you're successful or not, as it's kinda at the point where I think a Pi Zero should be able to, but I'm not sure.

faint sparrow Jul 7, 2021, 9:24 PM

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Hello! I recently bought a Raspberry pi 4B. I am trying to control Gpio's but pi always shows no module named Rpi.. Even after I installed the package. Can anyone help me out?

opaque wagon Jul 7, 2021, 10:10 PM

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Capitalization is important - I believe it should be rpi instead of Rpi

gaunt hatch Jul 8, 2021, 10:15 PM

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Hey, guys
I'm trying to get my rpi pico to run a code but nothing seems to happen
This is all I get
Adafruit CircuitPython 6.3.0 on 2021-06-01; Raspberry Pi Pico with rp2040

%Run -c $EDITOR_CONTENT

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I know there's nothing wrong with the code because it works on my arduino board

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nvm I figured it out, the code was too large for it's memory

oak frost Jul 9, 2021, 1:44 PM

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I want to control 2 stepper motors and 12 LEDS (not individually) using a raspberry pi B+
Can I just buy a 4 output motor driver for this?
The cheap one is marketed as a "stepper motor driver" so would this work?

hidden pebble Jul 9, 2021, 1:59 PM

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@oak frost What did you have in mind to buy? Might be worth posting a link to it then we can evaluate.

turbid rivet Jul 9, 2021, 3:33 PM

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oak frost I want to control 2 stepper motors and 12 LEDS (not individually) using a raspbe...

A lot of the cheaper stepper drivers or motor/stepper hybrid drivers are still very timing restrictive, meaning that while an Arduino or a Pi Pico would handle these with relative ease, a processor module like a Raspberry Pi would struggle to utilize this kind of driver well. If you want to control a stepper motor with a Raspberry Pi, I recommend at a minimum getting a stepper driver with a step/dir interface, so you can ease the burden of tightly controlled synchronus oscillation.

For higher-precision applications, I recommend using a microcontroller as an intermediary to control the stepper timing.

ancient iris Jul 9, 2021, 7:32 PM

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I am building an app that currently runs on a Raspberry Pi Zero W, but needs to be able to communicate simultaneously using BLE and serial (UART). I’ve discovered that this is a problem on Raspberry Pi’s and I’m looking for some other processor that supports BLE and doesn’t have the UART limitations of a Pi. Any suggestions? App was originally written in Java and communicating with a serial device, but adding BLE to make a BLE peripheral was a problem in Java. Switched to Python and have the BLE peripheral working, but now trying to add the serial I/O I’ve run into the Raspberry Pi issues with UARTs.

torn trench Jul 9, 2021, 11:15 PM

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ancient iris I am building an app that currently runs on a Raspberry Pi Zero W, but needs to ...

What's the problem with using BLE and UART at the same time?

I thought one UART was hooked up to the bluetooth stack, and the other UART was hooked up to pins? Can you not use both of those at the same time?

ancient iris Jul 9, 2021, 11:24 PM

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Please see docs.bitscope.com/pi-serial. With BT turned on the useful UART is used by BT, leaving the miniuart for serial i/o. The miniuart is tied to the VPU clock which varies, dynamically changing the bit rate (who came up with that brain-dead idea?). Alternative is to overclock the device, which “causes the Pi to draw a lot more current”. I need a low power battery-powered device, to go along with Bluetooth Low Energy, that can utilize both BT and serial comms.

torn trench Jul 9, 2021, 11:27 PM

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it looks like you can lock the VPU clock without overclocking

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(I assume you were already aware of this)

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but wouldn't that solve the issue?

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interesting reading btw, thanks for the link

oak frost Jul 10, 2021, 12:26 AM

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turbid rivet A lot of the cheaper stepper drivers or motor/stepper hybrid drivers are still v...

I'm running it very slowly 1 day and 1 year per rotation

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I thought that you can just energize the different sections to rotate the motor, I'm just using the motor driver as a prebuilt h bridge

oak frost Jul 10, 2021, 12:54 AM

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https://sg.element14.com/on-semiconductor/lb1936v-tlm-e/motor-driver-stepper-2-ph-ssop/dp/2844986?st=motor driver

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@hidden pebble im thinking this one

oak frost Jul 10, 2021, 1:17 AM

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maybe this https://sg.element14.com/texas-instruments/drv8844pwpr/motor-driver-1-2-h-bridge-htssop/dp/3118949?st=motor driver

oak frost Jul 10, 2021, 1:33 AM

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Maybe ill get three transistors and unipolar stepper motors instead

scenic jacinth Jul 10, 2021, 7:01 PM

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Is there any distribution for the raspberry pi for creating an easy to use access point?

I want to reuse a Pi I have here, and I do know how to work with hostapd, but I was wondering if there is a specialized distro for it.

torn trench Jul 10, 2021, 7:11 PM

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I'm not aware of a specialized distro. Is there something you hoped a specialized distro would do?

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You could set something up to build a special image of raspios with all your software preinstalled if that's the kind of thing you're looking for

scenic jacinth Jul 10, 2021, 7:28 PM

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I would like it to have an interface similar to an OpenWRT router, where you just burn the firmware and then get a web page to control the AP.

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I have done something similar with FruityWifi, but in this sense, it's not a specialized distro, but something you install on top of a general purpose distro.

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I use it on a infosec course to demo some nice wifi attacks, which fruitywifi also has a bunch integrated.
http://fruitywifi.com/index_eng.html

ancient iris Jul 11, 2021, 4:11 AM

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torn trench (I assume you were already aware of this)

I haven’t been able to configure the Pi correctly to get BT working on the miniuart and free up the good UART for my app.

fierce spire Jul 11, 2021, 1:24 PM

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I am currently writing a program that uses textfiles to write in but if the program gets interrupted and can't close the file correctly, all the written data gets deleted and a blank textfile is left over. Is there a way to make some kind of caching without closing and reopening the file?

opaque wagon Jul 11, 2021, 1:25 PM

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I believe for file objects there is a flush function which will write to the disk (idk going off of memory lol)

fierce spire Jul 11, 2021, 1:50 PM

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ok thank you

humble badge Jul 12, 2021, 10:07 AM

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Does anyone have any experience with using spi devices on Pi?

gentle briar Jul 12, 2021, 12:11 PM

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You're probably going to get better results asking your actual question.

oak frost Jul 12, 2021, 12:22 PM

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True that

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Anyone have any idea how i should run a stepper motor using my rpi

gentle briar Jul 12, 2021, 12:40 PM

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One fairly straightforward approach would be a stepper HAT like this one: https://www.adafruit.com/product/2348

Adafruit DC & Stepper Motor HAT for Raspberry Pi - Mini Kit

Let your robotic dreams come true with the new DC+Stepper Motor HAT from Adafruit. This Raspberry Pi add-on is perfect for any motion project as it can drive up to 4 DC or 2 Stepper motors ...

oak frost Jul 12, 2021, 2:47 PM

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Doesn't seem that great as it's huge, expensive and straightforward

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I'm new to electronics so it would be nice to solder some ICs and resistors or something

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I could get a "regular" motor driver which I think should be able to control the motor by using it as a system to control a high power wire with a low power one and in both directions

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I also have a LED load which it could also power

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But in my head it should work but I think I saw some contradictions online

turbid rivet Jul 12, 2021, 2:58 PM

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You're going to need to be more specific with what you mean by a "regular" motor driver. if you're looking at a "regular" motor H-bridge, you'll need a pair of them, and you will need to be able to reliably switch them at speeds relative to how fast you need the stepper to turn.

oak frost Jul 12, 2021, 3:01 PM

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I need to run it very slowly

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I will get one with 5 outputs then

turbid rivet Jul 12, 2021, 3:02 PM

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5 outputs?

oak frost Jul 12, 2021, 3:02 PM

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yessir

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4 for 2 stepper motos and 1 for the lights

turbid rivet Jul 12, 2021, 3:04 PM

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Not sure if you need an H-bridge for an LED....

ripe pike Jul 12, 2021, 3:53 PM

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Hi friends, so confession: I don't understand the value of the CM4 boards... it feels like you need to build a board underneath with IO similar to a traditional RPi (sd cards, usb), and is more expensive (albeit is better specced, sometimes). For example, this project: https://www.crowdsupply.com/diodes-delight/piunora
Doesn't that duplicate a RaspberryPi? Yes, it has more novel IO, but can't a RPi Hat provide that, too?

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What am I missing?

turbid rivet Jul 12, 2021, 3:56 PM

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The CM4 boards are intended more for a mass-production scale than a hobbyist use. If you are developing a product you plan to sell, a compute module takes all the functionality of a standard pi4 and makes it much easier to assemble to a finished PCB.

turbid rivet Jul 12, 2021, 4:00 PM

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ripe pike What am I missing?

Mass production requirements for your projects, I assume. 😉

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As for that Piunora project in particular, it appears to be a good drop-in replacement for an existing Arduino project with an additional computing requirement added. Can't say it's for everyone, but it does have a smaller footprint than a Pi with a PiHAT.

ripe pike Jul 12, 2021, 4:29 PM

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Well actually, I am producing a product for sale haha. Built on an RPi, but we are building a HAT. http://pioreactor.com/
If I choose a cm4, I still would end up implementing sd card, etc. Different stokes I suppose

turbid rivet Jul 12, 2021, 5:08 PM

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ripe pike Well actually, I _am_ producing a product for sale haha. Built on an RPi, but we...

Ahhh, I see. I guess in that case the difference isn't in mass-production, but the goal of the deliverables haha. If you ever do move away from HATs to a complete, integrated solution, a CM4 would be an option to consider then.

cobalt forge Jul 12, 2021, 7:26 PM

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Since QT Pi rp2040 is out of stock, I am going to use a tiny2040. I believe this will work. I am having trouble figuring out the SPI pins though. Could you tell me what TFT pins go to what tiny2040 pins. I got most of them figured out.

TFT Tiny2040

V+ 3V3 (Pin 3)
GND GND (Pin 2)
CK SCK (Pin 14)
SI ???
TC RX (Pin 0)
RT TX (Pin 13)
DC SCL (Pin 6)
BL SDA (Pin 7)

What does the SI pin traslate to?

Thanks

steady rose Jul 12, 2021, 7:38 PM

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what TFT?

cobalt forge Jul 12, 2021, 7:39 PM

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adafruit 1.54 240x240 TFT Display

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it is for the kitty paw macropad

steady rose Jul 12, 2021, 7:45 PM

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CK and SI are the main SPI pins

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the others are just any available GPIO

cobalt forge Jul 12, 2021, 7:45 PM

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So what would the pin equate to on the tiny2040?

steady rose Jul 12, 2021, 7:46 PM

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CK = SCK and SI = RX (SPI)

cobalt forge Jul 12, 2021, 7:46 PM

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does the SI pin assign the slave number?

steady rose Jul 12, 2021, 7:47 PM

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the TFT has better pin labels on the back

cobalt forge Jul 12, 2021, 7:47 PM

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Hmmmm....

steady rose Jul 12, 2021, 7:47 PM

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https://cdn-shop.adafruit.com/1200x900/3787-10.jpg

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SI is short for MOSI which is Microcontroller OUT, Sensor or device IN

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so in this case, IN to the TFT

cobalt forge Jul 12, 2021, 7:48 PM

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when using the QT Pi rp2040:

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Wiring TFT to QT Py

Solder the wires from the TFT display to the pins on the QT Py. Make the following connections.

V+ from TFT to 3V on QT Py
GND  from TFT to GND QT Py
CK from TFT to SCK QT Py
SI from TFT to MOSI on Qt Py
TC from TFT to RX on QT Py
RT from TFT to TX on QT Py
DC from TFT to SCL on QT Py
BL from TFT to SDA on QT Py

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so TC -> RX already so what does the SI go to?

steady rose Jul 12, 2021, 7:50 PM

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SI would go to one of the SPI RX pins

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https://cdn.shopify.com/s/files/1/0174/1800/files/tiny-2040-pinout-diagram_4dd9e9ab-6f6f-4b63-82d4-16793d109f17.png?v=1614260173

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not to be confused with UART RX

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CK would go to SPI SCK

cobalt forge Jul 12, 2021, 7:51 PM

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Yeah. I was using the diagram the SPI column

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So, TFT Tiny2040

V+ 3V3 (Pin 3)
GND GND (Pin 2)
CK SCK (Pin 14)
SI ???
TC RX (Pin 0)
RT TX (Pin 13)
DC SCL (Pin 6)
BL SDA (Pin 7)

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so based on the TFT -> QT Py and the pins I'm using on the Tiny2040, are they correct and again what would the SI pin go to if the TC is going to SPI RX already

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Sorry if I am confused

steady rose Jul 12, 2021, 7:56 PM

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SPI RX can show up in two places. use one for TFT. the other can be used for TC if you want.

cobalt forge Jul 12, 2021, 7:57 PM

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Oh, so the SI and RT from the TFT can go to the same SPI RX?

steady rose Jul 12, 2021, 7:57 PM

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it's only on one pin at any given time

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    V+ from TFT to 3V on Tiny 2040
    GND  from TFT to GND Tiny 2040
    CK from TFT to GP2 Tiny 2040
    SI from TFT to GP0 on Tiny 2040
    TC from TFT to GP4 on Tiny 2040
    RT from TFT to GP5 on Tiny 2040
    DC from TFT to GP6 on Tiny 2040
    BL from TFT to GP7 on Tiny 2040

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something like that maybe?

cobalt forge Jul 12, 2021, 7:59 PM

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Oh ok!!! Thank you. I will give that a try. Thank you very much!!!

sturdy lodge Jul 12, 2021, 11:09 PM

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Is any one familiar with rgb image data type option from the pi.camera capture function?

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the guide im looking at is suggesting i use >

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data = np.empty((cam_res[0],cam_res[1],3),dtype=np.uint8)

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as the data type to save an image into but it returns an error cause the first position of the np.empty object is a 3item vector when it needs a single value item instead

tribal hawk Jul 12, 2021, 11:40 PM

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Hi! I'm trying to connect a Pico to the OTG USB port of a Pi Zero and see it in the terminal - I'm connected to the Zero using an FTDI adapter (serial), but when I run sudo blkid it doesn't show up in the list. I can see and mount the SD card I have connected to the GPIO header, but bot the Pico as a Mass-storage device (I plugged it in with BOOTSEL held down to activate it's RPI-RP2 drive). The USB OTG connection is direct (not through a hub). Any ideas?

oak frost Jul 13, 2021, 2:54 AM

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turbid rivet Not sure if you need an H-bridge for an LED....

Emergency self destruct

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Okay after research I learnt the very disappointing truth about connecting an LED the wrong way around

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The actual reason was to save money

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But transistors can cost as low as S$0.03

torn trench Jul 13, 2021, 5:45 AM

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tribal hawk Hi! I'm trying to connect a Pico to the OTG USB port of a Pi Zero and see it in...

I took a shot at connecting a pico to my zero w with a micro-usb to micro-usb cable. blkid shows the pico as a mass storage device when I hold bootsel when plugging in the pico (although this also causes the zero w to reboot!)

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what role does an ftdi adapter play here?

marble hollow Jul 13, 2021, 8:01 PM

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Question on powering RP2040 Feather, with a battery for use outside year round. Since LIPO's are not recommended to be used below 0 degrees C and I need to have this run Below 0 F I am puzzled as to a appropriate battery and solar charge to use. Does anyone have any suggestions? Thanks

fresh marsh Jul 13, 2021, 8:29 PM

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I have a hyperpixes hookded up to a cyberdeck plugged inti a pi400 I installed the software but nothin shows up on displa

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are there ant common gotchas I should look for?

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sorry hyperpixel 4.0 "

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I used "curl https://get.pimoroni.com/hyperpixel4 | bash" for the software, is that correct?

steady rose Jul 13, 2021, 8:36 PM

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@fresh marsh there is a known hardware issue with that combo. one sec. let me find links to relevant info.

fresh marsh Jul 13, 2021, 8:36 PM

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awesome thanks

steady rose Jul 13, 2021, 8:37 PM

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start here and read rest of thread:
https://forums.adafruit.com/viewtopic.php?f=50&t=179733&start=15#p875641

fresh marsh Jul 13, 2021, 8:38 PM

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k will do thanks

fresh marsh Jul 13, 2021, 9:19 PM

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wait do i need a 64-bit OS image on the pi400?

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i never get anything not even a screenflash

faint sparrow Jul 13, 2021, 9:29 PM

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https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=275372&start=850

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Sounds like it's not stable yet. So: no.

fresh marsh Jul 13, 2021, 10:02 PM

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oh

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I tried cutting the trace and either that doesn't work in my case or I didn't do it correctly (my vision isn't that good and I am paralyzed in the left arm and hand)

hardy plaza Jul 13, 2021, 10:08 PM

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fresh marsh I tried cutting the trace and either that doesn't work in my case or I didn't d...

When cutting a trace, use an exacto knife and make a 45 degree cut from one side, then a (roughly) 45 degree cut from the other, so you're creating a tiny channel. Then if you clear out any remaining material between the two cuts there won't be any connection. Don't dig too far or you may cut a trace within the PC board (some PC boards have multiple layers, not only on the surface).

This 45 degree cut isn't quite so tricky as just scraping at it and hoping you've disconnected the trace, it's just two angled cuts just slightly apart, then a bit of cleanup between.

fresh marsh Jul 13, 2021, 10:12 PM

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ugh I don't think I'm able to do that kind of work

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Is it possible to get an updated one sent to me?

cobalt forge Jul 13, 2021, 10:18 PM

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steady rose ``` V+ from TFT to 3V on Tiny 2040 GND from TFT to GND Tiny 2040 CK...

Wll that didn't work, \ncode.py output:
Traceback (most recent call last):
File "code.py", line 44, in <module>
NotImplementedError: No default SPI bus

hardy plaza Jul 13, 2021, 10:26 PM

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fresh marsh ugh I don't think I'm able to do that kind of work

Can you find a magnifying glass somewhere? Or a jeweller's loupe? They sell magnifying glasses with attached lights, some expensive, some quite a bit cheaper.
https://www.wish.com/product/5c8620b983ef6253b171141d?hide_login_modal=true&from_ad=goog_shopping&_display_country_code=NZ&_force_currency_code=NZD&pid=googleadwords_int&c={campaignId}&ad_cid=5c8620b983ef6253b171141d&ad_cc=NZ&ad_curr=NZD&ad_price=18.00&fallback_cids=5ce798e14ee6f65a2aa820d9&campaign_id=9973252488&exclude_install=true&gclid=CjwKCAjw87SHBhBiEiwAukSeUTcCkOpqvLvG-pt6aicX1EIUmpnu-Rxcy5hXG8ZeO0bxWP1L9-r-ARoCBxcQAvD_BwE&share=web

That one is $16. I've also found that no matter how good one's eyes, adding a lot of really bright light helps a lot. When I'm soldering something very small I turn on a really bright white LED spotlight, which makes a lot of difference. I can appreciate the difficulties for the hard-of-sight, or those with shaky hands. I doubt you could get a modified one but you might be able to find someone around you who could do the work since it's only a few minutes' effort.

Wish

Headband Magnifier Led Light Head Lamp Magnifying Glass Jeweler Lou...

Buy Headband Magnifier Led Light Head Lamp Magnifying Glass Jeweler Loupe With Led Lights 1.5x 3 X 8.5x 10x at Wish - Shopping Made Fun

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(though I don't believe that "Wish" is "Shopping Made Fun")

fresh marsh Jul 13, 2021, 10:28 PM

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it is a combination of being partially blind and lack of use of two hands( results of major stroke six years ago)

torn trench Jul 13, 2021, 10:28 PM

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fresh marsh Is it possible to get an updated one sent to me?

If you're asking about sending it back to adafruit (seems reasonable if it really is a hw defect) you may be best emailing their support

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(many of us here are just fellow customers :) )

fresh marsh Jul 13, 2021, 10:29 PM

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okay thanks I'll try that

hardy plaza Jul 13, 2021, 10:29 PM

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fresh marsh it is a combination of being partially blind and lack of use of two hands( resul...

Understood, and sincerely, I'm sorry to hear. I think this may be one of those times in life to "find a willing teenager"...

torn trench Jul 13, 2021, 10:29 PM

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However, if you live near Seattle I'd be happy to take a shot at it

fresh marsh Jul 13, 2021, 10:30 PM

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funny thig is I do live near Seattle (what are the odds)?

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but that is too much to ask of someone

hardy plaza Jul 13, 2021, 10:33 PM

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I dunno. I live in New Zealand (so not quite so close to Seattle) but if you were within an hour of me I'd be happy to meet in a cafe and help you. People can be complete jerks but there are also those willing to help others out, which is one of the lovely things about people.

steady rose Jul 13, 2021, 10:41 PM

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@cobalt forge you'll need to manually create the spi bus with busio and not use the board.spi one

torn trench Jul 13, 2021, 11:35 PM

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fresh marsh but that is too much to ask of someone

It wouldn't be a inconvenience for me, it's good for me to get out of the house and get some fresh air. I also can't guarantee that I could even fix it haha. No worries if you'd rather RMA it though.

hardy plaza Jul 13, 2021, 11:41 PM

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torn trench It wouldn't be a inconvenience for me, it's good for me to get out of the house ...

@fresh marsh and @torn trench I'd be a bit skeptical that cutting a trace as per the link provided would necessarily fix the problem, though perhaps you could diagnose it, dunno. In reading over the messages about this it's certainly not clear what's wrong, it is possible that the board is damaged. I've got the rectangular HyperPixel on a Pi 4 and it works fine, but it wasn't the most straightforward installation.

But I highly encourage you to get out of the house. 😋

torn trench Jul 13, 2021, 11:51 PM

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Yeah what's the theory behind this? Severing the trace to the STEMMA connector that's shared with CS on the display?

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And the idea is that the long trace for the STEMMA connector is picking up a signal or something?

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The fact that it only seems to happen with the pi 400 is kinda interesting, and does kinda lead one to suspect electrical gremlins

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@hardy plaza what standards do you use for off-pcb comms on your robots?

ripe pike Jul 14, 2021, 1:33 AM

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TIL about the pinout command in the terminal. Try it out! Provided by https://github.com/gpiozero/gpiozero

cobalt forge Jul 14, 2021, 2:17 AM

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steady rose <@!805252538240335922> you'll need to manually create the spi bus with busio and...

Ok thanks

wintry steeple Jul 14, 2021, 7:16 AM

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is there a way to get raspberry pi ip address automatically for server-client connection via same network?

hardy plaza Jul 14, 2021, 7:28 AM

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wintry steeple is there a way to get raspberry pi ip address automatically for server-client co...

Are you asking "what is a static IP address?"

wintry steeple Jul 14, 2021, 7:35 AM

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hardy plaza Are you asking "what is a static IP address?"

if i set a static ip address does it still work with vnc viewer?

hardy plaza Jul 14, 2021, 7:45 AM

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I'm not sure what you're trying to do. But if you need to get a fixed IP address for your VNC configuration, you'll need to figure out how to set a static IP address.

wintry steeple Jul 14, 2021, 7:46 AM

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hardy plaza I'm not sure what you're trying to do. But if you need to get a fixed IP address...

okay thanks

torn trench Jul 14, 2021, 7:50 AM

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zeroconf networking may be a better solution to your problem

torn trench Jul 14, 2021, 7:51 AM

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wintry steeple is there a way to get raspberry pi ip address automatically for server-client co...

which would allow you to access the pi by its hostname