#help-with-linux-sbcs

1 messages · Page 4 of 1

umbral sable
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They are available in that voltage range, at least, since 1.2V is somewhat common these days.

copper summit
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Much appreciated I may only need tx so will start there thank you so much.

copper summit
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The pico uart is 3.3?

torn trench
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It should be possible. Might require bootloader shennanigans

dusk grotto
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Yeah because even though updating worked

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I still cant install the imager

torn trench
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also if your existing pi os partition takes up the entire SD card, you might not be able to reduce the size

hollow bridge
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I am attempting to use a Raspberry Pi to run a strip of WS2811B LEDs.
I was recommended to use the rpi_ws281x and adafruit-blinka libraries.
When I attempted to pip3 install the rpi_ws281x and adafruit-blinka libraries, I was met with the following error:

Collecting sysv-ipc (from adafruit-blinka)
  Downloading https://files.pythonhosted.org/packages/0c/d7/5d2f861155e9749f981e6c58f2a482d3ab458bf8c35ae24d4b4d5899ebf9/sysv_ipc-1.1.0.tar.gz (99kB)
    100% |████████████████████████████████| 102kB 1.6MB/s 
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-o4ihuwxz/sysv-ipc/setup.py", line 11, in <module>
        import prober
      File "/tmp/pip-build-o4ihuwxz/sysv-ipc/prober.py", line 137
        d["SYSV_IPC_VERSION"] = f'"{version}"'
                                             ^
    SyntaxError: invalid syntax

It seems that the Raspberry Pi's Out-of-box Python version (even after apt update and apt upgrade is still only 3.5.3-1. The syntax that caused the error only works in Python 3.6+.

I have been trying to update Python to 3.11 (or really, any version >=3.6) for the past few days, but it seems that the Raspberry Pi is not allowing me to. Or, when I do manage to do it, it says that the _ssl module fails to install and refuses to allow me to pip install anything else. It seems that newer versions of Python require a newer version of OpenSSL, but even when I try to make install that manually, Python still refuses to use it when I make it.

...Am I missing something? Why does a module intended to run on a Raspberry Pi fail to run on a Raspberry Pi? And why can't I update Python?

turbid rivet
copper summit
hard pike
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You can also run it on 1.8V logic

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😬

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But there are not terribly many useful applications for that

turbid rivet
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Oh, the chip can. I guess more specifically the Pico runs 3.3v.

twin helm
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can the chip still talk USB if running at 1.8V I/O?

hard pike
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1.8V is if you want to run the chip really fast

turbid rivet
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Is it faster? I thought the goal of lower voltage was to save power

hard pike
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Well, if you want to run a faster PLL you need a lower voltage

turbid rivet
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I guess it would reduce rise and fall times, but doesn’t lower voltage affect clock speed?

hard pike
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The max 135MHz from my understanding is only doable if you use 1.8V supply. But perhaps you could get some nice power performance out of 1.8V

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Though generally I’d assume you’d draw more current at lower voltage

twin helm
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oh, is the clock speed thermally limited at 3.3V or something?

hard pike
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It might be? I just know all the overclocking is done with lower supply voltages and tuning the internal regulator

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Also looks like the ADC supply can only be 3.3V

hard pike
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My guess is 1.8V to VReg_In would reduce thermal loss of the LDO

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So it would definitely help reduce any thermal throttling caused by heat generated from the LDO

scarlet latch
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Hey guys I have a raspberry PI 3 at work that I have had for several years. I am trying to connect with remote desktop connection and its not working. It will connect, i can see the desktop but I am unable to click anything. I am doing this at my home with my raspberry PI4 with no issues. Any idea whats going on?

pure sigil
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hi

haughty kettle
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Anyone here ever set up the Adafruit Braincraft hat?

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I followed the guide Lady Ada wrote on getting it set up and everything went smoothly. All test run just fine and I get the expected output, however, when I tried following the next guide on TensorFlow Lite object recognition I hit a snag at running the graphic labeling demo. Pygame complains that it doesn't have a display to output to, but I configured and set the default display according to the guide and when I test the display only it works just fine. Not sure what Pygame is complaining about or how to troubleshoot it. Any pointers are welcome and appreciated. Thanks in advance!

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For reference, here are the two guides I used:

Adafruit Learning System
Adafruit BrainCraft HAT - Easy Machine Learning for Raspberry Pi

Easily use Machine Learning on a Raspberry Pi 4 using the BrainCraft HAT

Adafruit Learning System
Running TensorFlow Lite Object Recognition on the Raspberry Pi 4

Automatic object detection on the Raspberry Pi using TensorFlow Lite

tropic flame
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Guys What’s up with this Raspberry Pi shortage? I just burned one out and I’m losing my mind.

tired marsh
tropic flame
raw solar
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Just don't pay scalper prices, it encourages them

hard pike
tired marsh
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availability changes frequently, don't rush it

tropic flame
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I would rather suffer in pain than make a scalper happy.

hard pike
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Bears are a great metaphor for buying from scalpers

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Same

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I’m just going to become an industrial customer for Raspberry Pi so I can get some compute modules

tropic flame
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So whats the dif between compute and Standard Model 3-4B or Zero W

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I can still run rasbian lite and manipulate the GPIO pins with Python right?

hard pike
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So if a 4GB WiFi 32GB MMC doesn’t work, I can very quickly put in an 8GB Wi-Fi 32GB MMC module. No soldering or real hiccups at all

raw solar
hard pike
raw solar
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Indeed

tropic flame
hard pike
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Should work without much modification

tropic flame
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Sweet

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Do you guys know of any clone boards with wifi that can run Rasbian

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or is that not a thing]

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I know Arduino has a bunch of copies that work with the same IDE

hard pike
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Might be difficult to get rasbian on other if you’re not familiar. But Rasbian is based on Debian

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So you can install Debian on most A7 or better SOCs

tropic flame
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any boards with wireless and a solid amount of GPIO's you would suggest?

hard pike
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BeagleBone are great

torn trench
hard pike
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The beagle bone blue has Wi-Fi, the SoC is an Octavo one with a PRU which allows you to do things that would usually require an additional microcontroller to do

torn trench
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I believe the latter are substantially faster. But I use a lot of plain old zero ws because it’s hard to beat $10 for wifi and Linux.

hard pike
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The only weird thing is the connectors

torn trench
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The beagles are really awesome

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Not quite as cheap, but I think it’s probably cheaper than a pi at the moment

raw solar
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I have a Zero W that’s lived in my attic for like 4 years

torn trench
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And it’s probably the second most supported Linux sbc? I think it also runs mainline Linux?

hard pike
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It might run Ubuntu, definitely runs Debian

torn trench
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And is fully open source from the schematics up?

hard pike
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Yup

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Only weird thing is the documentation of the Sitara A8/9 but TI gave BeagleBone a lot of leeway on publishing documentation

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Especially since TI founded the BB org lol

torn trench
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Sometimes I think the sitara has too much documentation lol

tropic flame
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The main issue for me is that i'm just getting into this stuff and rely heavily on the premade libraries for networking type projects

torn trench
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1000s of page manuals

tropic flame
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and all of those are written for the pi

hard pike
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Compared to Broadcom it’s like getting the lord of the rings series lol

torn trench
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Yeah haha it’s better than just getting nothing for sure

hard pike
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Broadcom gives you a pamphlet and then says $1m for the full data sheet

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And then still holds it back

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I kind of wish Raspberry Pi moved away from Broadcom and just rolled their own SOC

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The Pi 2W was great but still Broadcom

torn trench
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Idk why people use wiring pi for gpios instead of sysfs, for example

hard pike
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Blinka would be largely preferred if you need cross platform flexibility and ease of use

torn trench
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But I mean, if you want to use a library that depends on wiring pi then it does you no good for me to say that haha

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What is blinka?

hard pike
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Blinka is essentially the interface for circuitpython to SBCs

torn trench
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I feel like 95% of pi stuff should be done through Linux interfaces instead of some pi thing

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Oh yeah if you want it to be circuitpython then that sounds like a good option

hard pike
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Blinka supports a number of SBCs

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It’ll be slower, but if you’re starting out, speed isn’t really a primary objective

tropic flame
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Oh true. I see Adafruit has some documentation on setting up their IO platform on
black

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BeagleBone Black

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Thanks for the info everyone!

random falcon
raw solar
neon frigate
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is this legitimate? it seems a bit too good to be true

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https://store.rakwireless.com/products/raspberry-pi4-model-b-4gb?variant=42471708917958&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&utm_term=&utm_campaign=&utm_source=adwords&utm_medium=ppc&hsa_acc=7661842829&hsa_cam=19208204876&hsa_grp=&hsa_ad=&hsa_src=x&hsa_tgt=&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gclid=Cj0KCQiAzeSdBhC4ARIsACj36uFFQzxwTHQPlz1h4N9hNexH--Veuer1o4mLVNjKxO04liDxQLYytyYaAh4JEALw_wcB

RAKwireless Store
Raspberry Pi 4 Model B (4GB) | Stock Available

Get your Raspberry Pi 4 Model B 4GB for just $79! We also have kits for NB-IoT/Cat-M and LoRaWAN® applications, as well as enclosures for your Pi. Perfect for IoT development. Shop now!

wispy hazel
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Their shipping is pretty expensive though directly from their store.

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I recommend their official aliexpress store if in the Us, as it’s only $9.99 to here.

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Basically with there being little to no profits in helium mining anymore, they have a lot of stock to offload.

dusk grotto
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So I was setting up home assistant and then I clicked more to see what else it could fine now it's a little darker and I can't click anything what should I do

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And when I try to click anything I cant

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I'm scared to reopen the website

dusk grotto
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I got it fixed

true ember
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Background
-I have ledstrips I am controlling via circuitpython/blinka on my raspberry pi

Problem to solve:
-I would like to have a dim level be able to be set by a user physically (at least 5 steps from 100% to 0%), as the rpi is headless
-I'd use a pot, but rpi have no analogue inputs

Identified solutions

  1. An Analog-Digital Converter (ADC) + analog potentiometer
    I do not know which ADC unit is best and don't know how to evaluate differences.
  2. A digital potentiometer
    I have never used one nor know whether this would make things harder or easier
  3. Maybe just some 10-button accessory?
vague heron
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Hi, I’m using a PCA9685 board conecte to a raspberry pi, it has the address 0x41. The pi does detect it but when using the python library for the board I get an error saying that no board has been found on address 0x40, I assume it’s the default one.

What line of python code should I add to make it work? Or do I need to chain it with another board with address 0x40?

Thanks

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Is this the correct channel or should it go in robotics? Thanks

steady rose
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here's fine for now. sort of question that could be in various places. no biggie.

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you'd specify the non-default address when creating the PCA instance

# 
pca = PCA9685(i2c_bus, address=0x41)
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the library uses 0x40 as the default

vague heron
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These is my code, so would it work if I change line 6 for the line you told me? And then could I create a second instance line pca2 with the default address? Thanks

IMG_4357.jpg
steady rose
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do you have two PCA9685's attached?

terse helm
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Hi, wondering what the best strategy is for connecting to the test pads on a Pi Pico. I’m trying to use a different usb port and would like to hand solder if possible. I read you can use a hot plate and stencil to do this but trying to make this more accessible.

humble marsh
# terse helm Hi, wondering what the best strategy is for connecting to the test pads on a Pi ...

This channel is really for RPi Linux computers, not Pico. But if you're talking about the pads on the bottom, the easiest thing to do is to add some solder to those pads, and then tack-solder jumper wires to there (put the wire on the pad, and then put the soldering iron on the wire and melt the solder you added. If the wire is untinned you might need to add a little flux, but maybe not. A stencil and paste is not necessary at all.

vague heron
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I have connected them with the 0x40 Bering the first one and then the mother one like it says on adafruit website. I just could figure out the code, there was only the arduino version 😅

dapper dirge
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hi , i download the pico-ducky project and do all the steps that are on github and when i put the payload.dd and plug the pico it's works few times then stops and the only way to make it works is to restart the pc and this is not good for someone who change the payload or the script everytime so yeah , any idea ? and sorry for my bad eng <@&356864093652516868>

turbid rivet
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And yes, you should be able to declare two separate instances of pca9685 objects if you’d like. I think the ServoKit initialization does this for you too, if that’s what you’re trying to do…

humble marsh
vague heron
steady rose
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@dapper dirge ok, in that case, yes, you'll want two lines of code - one for each sensor attached. something like:

pca1 = PCA9685(i2c_bus)  # uses default 0x40 address
pca2 = PCA9685(i2c_bus, address=0x41)

if you wanted to code to be more explicit so the addresses are obvious, code also do this:

pca1 = PCA9685(i2c_bus, address=0x40)
pca2 = PCA9685(i2c_bus, address=0x41)

both options are functionally equivalent

brazen holly
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Hi all! A while back I purchased the RP2040 Adafruit Macropad. I tinkered with it a bit but since I was under a lot of workload and stress I put it on hold until I had free time after graduating. Unfortunately now that I have the time Ive been trying to figure out why my display has a constant circuitpy logo on the top left. My code has a simple print("Hello") To test it out. I have tried the nuke ufw and tried to reinstall circuitpy and its still there. I don't know if its in a mode that I am unaware of. I have skimmed the docs to find a reference to this but I have found none. I googled a bit and it appears I am the only one experiencing this? Idk if im just dumb or what. Picture is below.

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any help is appreciated!❤️

vocal lava
brazen holly
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ah sorry

vocal lava
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no need to apologize, you didn't know. 🙂

brazen holly
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thank you for the tip

wraith grove
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being an OLED, that freaked me out, there is a display structure thingy that can be poked at
also appreciate the not having time thing, I feel like I've abandoned something awesome there myself

dapper dirge
steady rose
dapper dirge
steady rose
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oops - sorry. tagged the wrong person. please ignore.

dapper dirge
dapper dirge
steady rose
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someone else above was working with multiple PCA's. somehow got your tag mixed up in the response. sorry.

dapper dirge
dapper dirge
steady rose
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hmmm. sorry. not right not at least. that could be various things and may take some time to figure out.

dapper dirge
vague heron
steady rose
vague heron
rigid girder
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Hi all

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I am trying to add some SK6812-e's to a pcb of mine that uses a pi pico

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I'd just like to ask, can I wire the DIN to any of the GPIO/ADC multi purpose pins and still have it function normally?

zealous seal
brazen holly
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Yeah I think It was just That I was missing some libraries and the different codes I was trying were exiting. The issue is fixed now. But thank you, you are right.

zealous seal
brazen holly
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Thanks! Might I Ask where you got the trackball that you added? Sounds like a cool idea for an Input Device.

zealous seal
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If you do get it - I have a case designed for it. I haven't uploaded it yet but I can add it to my case design files on printables/thingiverse

brazen holly
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thats so nice of you! thank you! I will try to look for it in Aliexpress or ebay to see if its in stock.

zealous seal
brazen holly
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thanks

verbal jacinth
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how many volts can i give to the raspberry pi pico via the pins? the adafruit website says 3.3V but google says 5.5V

dusk grotto
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You should be able to find the docs on the pi website

verbal jacinth
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thanks!

dusk grotto
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Should be on this page

faint sparrow
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I think the rpi rp2040 board has an unusual powr supply and esp. it can be run by a lower voltage than usual.

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The datasheet shows it clearly (schematic)

verbal jacinth
vague heron
verbal jacinth
dusk grotto
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There should be a dataset download

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It's a PFD

faint sparrow
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it's a PDF file

dusk grotto
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Yeah

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Or you can download it off the website your choice they both are the same

verbal jacinth
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managed to find this in the datasheet of the rp2040

verbal jacinth
# dusk grotto

so this means i can use a 4 x AA battery holder with the raspberry pi pico w?

image.png
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seems okay to me since the batteries will output about 6V

faint sparrow
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Don't lawyer it. ;)

verbal jacinth
dusk grotto
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This is where my knowledge ends

rotund pivot
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typical alkaline batteries can start out at 1.5V, I wouldn't do it

dusk grotto
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Yeah I agree with anecdata

verbal jacinth
dusk grotto
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I mean 6 volts is going to probably hurt it over time

faint sparrow
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I would derate it to VBUS 5.0 volts. Which is above the sweet spot. 5.5 v is right on the edge of operating range.

verbal jacinth
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so just use 3 x AA batteries? those output 4.5 volts

dusk grotto
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I mean in my eye that should work

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What are you planning on do with the pi that need a battery pack?

verbal jacinth
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making a handheld

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didn't consider using a lithium-ion battery because why not batteries

dusk grotto
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Hmmm interesting

verbal jacinth
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i could also use usb c

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seems to output 5v with the resistors on the breakout board

dusk grotto
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Question so I wanted to make a home assistant tablet display using the pi touchscreen how would I get home assistant showing on the same device that the server is on

verbal jacinth
verbal jacinth
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Eh, I think I need to put the positive wire into the VSYS pin since that’s the power of the system (VBUS is input of USB)

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Yep!

verbal jacinth
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still don't understand this though, i've seen people say that 5V is good enough and seeing it powered by about 4.5-5V

image.png
hoary mesa
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If you feed the Pico 5V the on-board dc/dc will step the voltage down to the 1.8/3.3V (not sure rn) the RP2040 needs

verbal jacinth
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so i can give 4.5V via the VSYS and GND pins just fine?

hoary mesa
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Yes

verbal jacinth
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alright thanks for the help

hoary mesa
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maybe add a diode on vsys to prevent the usb backfeeding

verbal jacinth
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oh yeah accidentally said VBUS

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there

hoary mesa
verbal jacinth
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can go up to 50V

hoary mesa
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I think the RPi Pico datasheet actually mentions a example diode you could use, let me check

hoary mesa
verbal jacinth
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i'd also want the pico to be powered by an usb C, should i use a resistor and a diode for clamping the voltage at 4.5V and preventing backfeeding?

hoary mesa
verbal jacinth
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USB C

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this one im gonna use

hoary mesa
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I suggest you read pages 18-20 in the Pico datasheet, that might already answer all the questions you have

verbal jacinth
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will the pico short?

hoary mesa
# verbal jacinth what happens when a backfeed happens?

If you connect a power source to the USB input aswell as the the Vsys-pin the source with the higher voltage powers the Pico. This also means that if the usb input is at e.g. 5.5V and your other power input is at 5V, the usb will start to feed power into the 5V input which may or may not damage that power input.

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The Pico already has a internal diode that "or"s the supplies and prevents backfeeding into the USB port

verbal jacinth
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ooh i thought you meant if the pico also sends power to the battery source

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by backfeeding

hoary mesa
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That is exactly what it means

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in this case the other power input is your battery

verbal jacinth
hoary mesa
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The pin probably wont be bothered by it but the battery most likely will

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take a look at this picture from the Pico datasheet

image.png
verbal jacinth
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alright, the battery holder im buying has a on/off switch so if im careful i won't need to solder in a diode

hoary mesa
verbal jacinth
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oh wait that would still damage it

verbal jacinth
hoary mesa
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for a more permanent approach you should add that second diode

verbal jacinth
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cant seem to find any schottky diode in the adafruit store

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but i can also use a p-channel mosfet, right?

hoary mesa
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In your case most diodes will do, doesnt have to be a schottky

verbal jacinth
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but it would also work with 1N4001 diode right

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alright

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about the USB-C breakout board, how can i limit it to only giving about 4.5 to 5 volts?

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it's something to do with the CC1 pin i think

hoary mesa
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usb c is not that trivial but I think slapping 5.1k resistors on cc1 & cc2 to gnd will get you 5V and up to 3A?

verbal jacinth
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there's already two 5.1K resistors on cc1

hoary mesa
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good to go then

verbal jacinth
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so just connecting the gnd and vbus pins of the breakout board to the pico is just fine?

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like vbus > vsys (with diode of course) and gnd > gnd?

hoary mesa
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Yup, its shown in the RPi Pico datasheet as I mentioned.

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what do you mean by gnd > gnd?

verbal jacinth
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connecting the gnd of the usb c board to the gnd of the pico

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same for vbus > sys

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vsys*

hoary mesa
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ah. You have to do that, yes

verbal jacinth
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does ground need a diode too?

hoary mesa
verbal jacinth
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okay, that should be it

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thank you!

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it should be this

image.png
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allowing usb and battery to be used at the same time

hoary mesa
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exactly

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👍

verbal jacinth
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and this for usb c

image.png
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forgot to change 4.5V to 5V on the breakout board
i'll use a digital multimeter to make sure the battery and usb c outputs about 5v

fickle rose
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if the diode's backwards it will have the exact opposite effect from what you want

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or is that just the image?

verbal jacinth
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Oh I thought the white needs to face away from the pin

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To only allow the battery giving power to the pin

fickle rose
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The stripe is the cathode side and the opposite side is the anode and the power will only flow from anode to cathode so from not stripe to stripe

verbal jacinth
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oooh, i'll update the images

verbal jacinth
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only allowing the battery to give power to the pico and preventing usb backfeeding

faint sparrow
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better off recognizing polarity than 'direction'. ;)

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the cathode band is 'closer' to the negative terminal of the battery or power supply.
a digital meter has the black lead as the negative terminal of the meter. That's the solid reference for polarity.

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The manufactured battery itself is the other solid reference for polarity.

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So when the black test lead from the meter is touched to the - (negative) terminal of the battery, and likewise red test lead to the '+' terminal of the battery, the measured voltage (DC volts) is positive - no minus sign on the front panel of the (digital) multimeter.

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Then just construct a test circuit for any diode and see what's what. (always use a series resistor of about 470 ohms or more before doing any tests with voltages)

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o------resistor-----diode-------o

verbal jacinth
verbal jacinth
faint sparrow
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I don't think about 'negative voltage' I think about polarity.
There's no way in a short conversation to ascertain what the other person knows, quickly.
Series resistors are used everywhere (pretty much) if you don't know enough to either reduce their resistance, or omit, entirely.

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Just a simple heuristic.

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They are not used at line levels, only at hobbyist voltages.

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I = E / R

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Just like with a simple transistor, the lower the exhibited 'resistance' the better, when passing current.

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Same with a long wire to your appliance, on a temporary extension cord. Goal is no voltage drop across the resistance of that long wire.

agile depot
#

I'm looking to develop a Unity based app to run on a Raspberry Pi Zero 2 W, what would be the best OS to run it on? I'm looking for one that can boot quickly, run efficiently, and use GPIO controls and a TFT instead of just USB and HDMI.

dusk grotto
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What’s the app for

agile depot
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I'm hoping to make a 3D Pokedex

hoary mesa
fickle rose
torn trench
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A lot of work though

verbal jacinth
agile depot
fickle rose
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Also the charge current would be unregulated again causing problems

hoary mesa
verbal jacinth
hoary mesa
raw solar
#

It’s common to have a protection circuit on the cell and a dedicated charging circuit. Raw cells have no protection

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Always check your datasheets

faint sparrow
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Have anyone tried using adafruit Optiga Trust-M breakout with Pico ? Any hints on where to start or check if the part works ? (Can see the LED on the Optiga)

velvet rampart
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how does everyone solder to gpio on pi4 model b or any other with preset headers?

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and can't be on reverse side due to screen being screwed there with small .5 standoffs

steady rose
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i generally avoid any direct soldering to a pi's headers

velvet rampart
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so where do u solder to? breakout board or terminals?

faint sparrow
#

the raspberry pi has headers so you use an IDE connector pressed onto a ribbon cable, or you can use individual Dupont jumpers.

#

The point was don't 'damage' the Pi by soldering to its headers. If it doesn't have them, solder them in all at once.
And generally don't just solder wires there - use headers.

raw solar
#

The only Pi I’ve ever soldered to was the Zero/Zero W — otherwise I usually use individual jumpers

steady rose
#

there are lots of options, so it depends on your setup.

velvet rampart
#

i used headers but it's still going onto a pin, maybe rephrasing it beyond. how do you deal with header pins which are too long?

verbal jacinth
hoary mesa
#

To prevent backfeeding you need the diode we already talked about

#

or you go for the more complex (more efficient) mosfet solution

verbal jacinth
#

not ground but to negative

#

or does it just.. work?

hoary mesa
#

The diode does not invert the voltage, no.

#

As I told you, the Raspberry Pi Pico datasheet shows the exact arrangement you want

#

Take a look at pages 18-20

faint sparrow
#

@velvet rampart Sometimes bend them over but they are vertically challenged and were not designed for compact builds at all. You can sometimes do a 90 degree this or that, especially pre-formed pin headers - they come in 90 degree mounts, or straight.

velvet rampart
#

i was bending every other one so this totally works

faint sparrow
#

They're there for providing uniform and fairly frequent disconnects.

velvet rampart
#

yeh i just didn't want duponts but maybe there's a way to make a more solid dupont fit

faint sparrow
#

oh wait tht's mad max' dog

#

there we go.
I have a press-fit pic I always post on this subject:

savya--staked-a.jpg
velvet rampart
#

oh doggy

faint sparrow
#

grab that pic before I delete it if you want it

raw solar
#

saves the dog

velvet rampart
#

paw

#

i can't steal a dog

faint sparrow
#

(Just so you know the mad max story line is that there was never any danger depicted, but the passenger did not know that - gyro captain)

#

More recently I use the same extra long header pins to 'pin' the target board to a breadboard. Unclear experiment as I haven't tested the results much.

velvet rampart
#

that's interesting

faint sparrow
#

In the above one pin is folded over up top, on each row, to keep it from getting loose again. I press really hard with my thumb to put a lot of tension on everything.

#

I try to fold over pins I won't use but sometimes that's impractical.
I do the same setup with RP2040 and several other boards.

velvet rampart
#

😅

dusk grotto
#

The mess of wires nooooo

velvet rampart
#

haha it's perfect

#

took me a long time to get it but now it's perfect

dusk grotto
#

Nah you should see my desk it’s is covered in wires for a project I’m working on lmao

velvet rampart
#

yes it happens. however on subject of the gpio a custom pcb is really better

#

and then a simple bridge between both

#

imo

dusk grotto
#

Wait what bored is that connected to

#

Board*

velvet rampart
#

that's a pi4 model b

faint sparrow
#

I'm thinking about buying USD $35 crimpers and blank Dupont pins to crimp onto silicone insulated wires, for flexibility. Or even hook up wire. Jumper wire will not hold a shape when bent, from the source I'm using.

velvet rampart
#

and i've cut proto board with a rotary tool and then through hole mounted the push buttons

#

have u seen the terminal blocks @faint sparrow they look nice

faint sparrow
#

I also use 'clipboards' from office supply store as a substrate - nice and thin and easy to work.

velvet rampart
dusk grotto
velvet rampart
faint sparrow
#

alright so this isn't raspberry pi and I don't like being found way off topic. ;)

velvet rampart
#

well the terminal block conforms to 40 pin gpio which is rpi

raw solar
dusk grotto
#

I was wondering if any could shed some light on how to do that

velvet rampart
#

mmmm

#

sending video over wifi? must be some sort of streaming library available

#

i don't know what a home assistant is sorry

raw solar
#

Amazon Alexa, Google Home would be examples of home assistants

dusk grotto
#

Or whatever their website is

raw solar
#

I meant for stendle not knowing what they are at all, those are popular examples

velvet rampart
#

are you just exposing data and events from the home assistant server? maybe they've got an API you can expose things to another screen via the network

dusk grotto
#

The issue is I want home assistant server and the dashboard running at the same time

dusk grotto
raw solar
#

I’m not familiar with that platform tho, so I won’t be much help

velvet rampart
#

maybe there's a way you can set the dashboard to run on any authorised device (just speculating here)

#

like i use some ruby scripts on a server but i can tell them as daemons to run in the foreground accesssible via an IP

raw solar
#

If it’s a web page you can just have the Pi open that page on boot

dusk grotto
#

Good idea I thought about that but when you boot it up it takes you straight to the terminal

#

It’s not pi os with the server running on top of it

#

It’s the server itself

#

You know what I mean

raw solar
#

Ah… so you want the server to display the dashboard on itself

dusk grotto
#

Correct

velvet rampart
#

(only joking here) use your phone to live stream the tablet to the internet

dusk grotto
#

Lmao 😂

raw solar
#

Thats tricky then, you’d need to add a GUI desktop environment to be able to show graphics

velvet rampart
#

🙂

velvet rampart
raw solar
#

I’m out of helpful info too XD others know more than I

dusk grotto
#

Is there away I could over ride it of some kind

#

Override *

velvet rampart
#

u could use obs commands and a robot with silicon gloves to push the buttons on the tablet via twitch bitties

#

[ really leaves the conversation ]

lost wolf
#

Hey, folks! The previous name of this channel has led to a significant amount of confusion regarding what the intended topic of the channel is meant to be. This channel is for questions and support about Raspberry Pi Linux single board computers, and other Linux single board computers. (It is NOT for support of the Raspberry Pi Pico or Pico W.) To that end, we've renamed the channel to #help-with-linux-sbcs to be clearer and more applicable. We hope this helps folks find the right channel for their questions moving forward. Thanks!

lost wolf
dusk grotto
#

I thought she was talking about us I got scared 😂

lost wolf
#

😄 Nope! That was meant for everyone.

twin helm
#

could you clarify whether that includes non-RPi Linux SBCs like BeagleBone? i suspect that's the intent…

#

(and would be a definite expansion in scope, but probably a welcome one)

lost wolf
velvet rampart
lost wolf
#

Nope, this covers all of them!

#

That's why we named it "linux-sbcs".

#

Instead of including RPi in the name.

velvet rampart
#

that's v clear i see it now

gentle briar
#

Amusingly, I needed something to pretend to be a PLC for a project and my Pi Zero died. I found an Orange Pi and was trying to find all the pieces to make it work when I tripped over a cache of Pi Zeros I had saved, so I grabbed one, along with a WiFi adapter plugged into an OTG adapter and had it going fairly quickly.

velvet rampart
#

stoked

gentle briar
#

I had been asked to "have the fake PLC send real data from something", so I had it respond to requests with the CPU temperature

hard pike
velvet rampart
#

i've been asking my one rl tech friend each time we speak on the phone "so, how many rpi boards are you sitting on rn?" he always says limited, and already taken in clusters

dusk grotto
#

Ok note to self people in the home assistant discord are kinda rude

#

I asked the same question their

#

And they basically shot me down

lost wolf
#

I'm sorry to hear that. Honestly, you'll be hard pressed to find other communities like ours. They exist, obviously, but they are not common. We are spoiled here. I'm so grateful to and proud of our community for being what it is.

velvet rampart
#

i tried a server dedicated to another sbc and well all they were posting was "i took 6 hours to compile a kernel and it has limited functionality" or "this emmc writer is preferred but it didn't work"

#

and "doesn't boot"

dusk grotto
gentle briar
velvet rampart
#

i want one but not got paid yet *cry more

dusk grotto
#

Never thought I would hear pi and in stock in the same sentence but that’s sick

hard pike
#

RPi announced there would be 100k+ units stocked at distributors but I honestly didn’t even notice a change in stock

wraith grove
#

I miss seeing pis for sale

faint sparrow
#

I’d still prefer this against ubuntu as this is much more controllable and less memory and cpu intensive

velvet rampart
#

rpi is frustrating with its wifi and when it decides to come online

#

some times it never happens, most of the time it does

#

.16 is not .161

#

not sure who typed that

#

these new mini sticks have a bad deadzone

gentle briar
velvet rampart
#

and the switch doesn't seem to work at all

faint sparrow
gentle briar
#

I have the Orange Pi Lite, which appears to only accept power via the barrel jack.

velvet rampart
#

okay adjustments for low and high in adc script so that's nice

#

now for that switch

velvet rampart
#

ok nothing wrong with the pin

#

ok i got a faulty part

#

what are the chances

velvet rampart
#

Recommended power is 5v 3a

#

I just read someone attempted to re route everything to a battery but had over voltage protection .

dusk grotto
velvet rampart
#

It does look good but I don't like the limited power source options on many of the SBCs

#

I'm looking at odroid more and more but quite pricey

zinc jackal
#

Shame Odroid don't use USB... Unless that's changed at some point.

velvet rampart
#

yeh i haven't seen any odroids that aint barrel jack either

#

the new rockpi has lots of problems

zinc jackal
#

I'm still waiting for people to fix up the Linux process for the Ox64.

manic glacier
#

Hello! I'm working on a project for controlling ws2812b LEDs from a raspberry pi 4. I'm wondering what the pros and cons are of using various driver libraries:

  1. https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel
  2. https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel_SPI
  3. https://github.com/rpi-ws281x/rpi-ws281x-python

In case it's relevant, I'll be controlling approximately 600 ws2812b LEDs with a desired frame rate of 30 FPS. I will want the pi to have audio output simultaneously. I will be using python.

Thanks for any insight you can provide!

gentle briar
velvet rampart
fickle rose
#

Oooo this place is new

earnest roost
#

Well, this channel was renamed. See the pinned message.

velvet rampart
#

I'm just going to wait for rpi 5

earnest roost
#

Not happening this year.

potent hedge
half nexus
velvet rampart
#

well let's all wait for pi 7 to be sure

fickle rose
verbal jacinth
velvet rampart
#

i want the pi 11 just like the playstation 8

velvet rampart
#

my pi4 model b has gone to heaven. careless with power supplies. 3d rendering in emulators is borked.

velvet rampart
#

yep even raspberry pi os the desktop has the pixelation now. fried chips

#

however

#

looks like it's just my power slot

#

ok no. it's got 'issues'

#

tried over in next hdmi slot also, same issues

#

sadness, was very close to printing the case.

#

looks like this rpi becomes a web server of some sort

#

it does actually solve a logistics problem i had so not all is lost

#

this pi will never see gaming, but it can still be beautiful ^^

#

😐

raw solar
#

At least you found all the issues before you had everything assembled...

velvet rampart
#

i think in the build i broke it, i've been swapping between 4 power sources

raw solar
#

Oof... I haven't had an issue like that

velvet rampart
#

and get this one of them is usb from a dc wall socket - super careless

#

and i overclocked it with only a passive heat sink. i totally deserved it

half nexus
#

To which PI 2+/B GPIO pins would you suggest to connect FDD pins 18 and 20?

hoary mesa
velvet rampart
half nexus
#

Alright, mini routine, help me make floppy music happen.
Hardware

Raspberry PI B (new header)
3.5" floppy drive (SDF-321B)
Female DuPont jumpers
Process:
Kingdread/floppymusic - Done (compiled with make MODEL=PI2)
Pi GPIO software configuration - Assistance needed
Wiring FDD to Pi - Assistance needed

spice kayak
#

With the pixelation, have you tried a different hdmi cable? I had display issues and thought after 5+ years that it was failing, but the adafruit mini hdmi worked. It was actually the official cable that just aged from over use. The version from adafruit is heavier/sturdier by comparison.

fresh patrol
velvet rampart
#

my final check was to use a dsi monitor, and yes that also has the pixelation now. so both interfaces via hdmi and dsi plus all other checks. funny thing is it's only with games that have 3d

half nexus
crystal jewel
#

G’day and G’evening. I’m debugging a U-Blox R412m board connected to my Pi-3 over USB and ’dmesg’ and ’lsusb’ are both showing absolutely nada when I plug/unplug the board; but the boards power led comes on (so that’s something). Being the board has a usb-c connector on it, im using a cheap usb-c/usb-a adapter and that’s my prime suspect (from previous experience of cellular boards and cheap usb cables)

#

But throwing it out to the brains trust in case I’ve overlooked something obvious and if you agree and reckon it’s the cable can someone let me know if they reckon this would fix the problem (being Adafruit I have faith of course but you gotta ask - esp. As it would be an international purchase for me!) https://www.adafruit.com/product/5045 (cos. Believe it or not I can not find anyone in my local retailers that stock anything other than cheap unreliable brand cables)

Black Woven Right Angle USB C to USB A Cable - 0.2m long

As technology changes and adapts, so does Adafruit, and speaking of adapting, check this Right Angle Black Woven USB-C to USB-A Cable. USB C is the latest ...

fresh patrol
#

As dumb as it sounds have you tried the usb C both ways up. in case one of the data sides is broken

twin helm
#

also, do you have any other USB hosts you can try to connect the board to?

crystal jewel
crystal jewel
twin helm
crystal jewel
#

Thanks! Good tips of turning the cable around works I’ll have something to say when people say “usb-c is superior since it works both way”☺️

twin helm
#

yeah, the D+/D- wires are only supposed to be hooked up on one side of the USB-C plug; the receptacles (or the device/host they're attached to) are responsible for electrically handling the cable flipping

fresh patrol
#

That can't be true for a A to C adapter though

#

Unless there's a chip in the A shell and it's not just a cable

twin helm
#

there has to be a CC resistor on the C side of such an adapter, in any case. but there's still supposed to be only one D+/D- pair; the device with the C receptacle has to sort it out

faint sparrow
#

Hi
I am emberrassed to make this post but here it goes.
I have used RPis and python for a few years, but never really understood the difference between different python versions, the difference between pip and pip3 or most of the errors I get when I fail to install stuff.

I really want to get OpenCV installed, and I have tried a few times and read instructions on many forums. I have no doubt that OpenCV is great, as well as many of the instructions that I have read, and that the fault lies in me. It is so frustrating knowing that if a knowledgable person would sit at my computer for 2 minutes, everything would work!

So please help me to get OpenCV installed. I understand that to be able to help me, you need to know a few different things. Can we start out by someone telling me what you need to know and how I can get that info?

winter meadow
faint sparrow
#

Thanks, will try that now

humble nova
#

and as someone else already said, 99% of the times, official docs for a given library/program goes into great details on how to install

faint sparrow
#

thank you for clearifying that 🙂

winter meadow
humble nova
#

i just meant that the "python == 2.x" part doesn't always hold
eg arch-based distros don't have 2.x iirc
or, installing python 3.x on windows, you use it as python

faint sparrow
winter meadow
faint sparrow
faint sparrow
humble nova
#

and imma guess you installed the lib for python3

faint sparrow
#

aha, what should I do?

humble nova
#

try running python3 /home/pi/faceRecog.py

#

ie: use the correct interpreter, where the lib is actually installed

faint sparrow
#

I get this now:

image.png
humble nova
#

no need to add the /usr/bin

#

(unless you removed it from $PATH)

faint sparrow
#

I still get the same thing:

image.png
humble nova
#

no, that's not an error, just a QoL change for your
the error seems like it's trying to import some C code that it can't find

#

have you installed doing pip3 install cv2 or how?

faint sparrow
#

apt-get

#

I tried with pip and pip3, but that did not work

humble nova
#

no idea how apt-get goes for installing python libs

#

let me test my Ubuntu WSL, should be somewhat similar to raspbian

faint sparrow
#

thanks!

humble nova
#

pip3 install opencv-python and then >> import cv2 worked

#

all i've done is googling for "install opencv" and go into PyPI (python's package index, which was also the 1st link) to see what the package is actually named: https://pypi.org/project/opencv-python/

faint sparrow
#

I tried the same thing now. This is what I get:

#

sorry, are you saying that I should do something else?

#

Again, I really appreciate you helping me.

humble nova
#

but, WSL Ubuntu is not the same as raspbian

faint sparrow
#

I installed the extra stuff that was mentioned in that link, at now it seems to work! I no longer get any error when I import cv2. Thanks!!

humble nova
#

google and its stackoverflow results, are our best friends when coding :p

faint sparrow
#

hehe, I know 🙂 But when you are bad at speaking the language (linux-stuff), it is difficult to undestand where to look and what everyone is saying. A channel like this really helps. I wish I knew about it earlier 🙂

humble nova
#

my 1st approach when i face an error/warning i don't understand is to google it, many times it solves the issue in a moment
if not, i proceed asking somewhere

half nexus
winter meadow
fresh patrol
half nexus
#

I'll probably use two 2A USB power supplies

fresh patrol
#

Sounds wise. Do tie the grounds together 🙂

thin wraith
#

I don't know if this is an error or what, but if somebody can tell me where something similar to pulseout in pulseio is i would really appreciate it. the python script is not there in the github so im just a little confused

image.png
torn trench
#

Not very familiar with blinka, but would pwmout work?

thin wraith
half nexus
#

Update: after failing to power the drive from the USB, I've decided to take out an old PSU. It's all fits together, just you know, when connecting any drive pins to ground, it doesn't light up the LED.
There are a few links in this chain that can be missing:
PSU

The PSU does not have power on the FDD pins
The FDD doesn't have ground pins all the way trough
The FDD light is dead
The FDD itself is dead
FDD

#

Third times the charm, it's working!

#

Everything is silent

#

Have I messed up with pin select?

#

The software works fine, or at least to some extent

pi@raspberrypi:~/c/FDD/floppymusic $ sudo ./floppymusic ~/c/FDD/midi/e1m1.mid
[floppymusic 1d68a51f]
Reading drive configuration drives.cfg
Setting up GPIO
Setting up drives
Reading MIDI file
Merging 1 tracks
Ready, steady, go!



Cleaning up
Bye bye!
pi@raspberrypi:~/c/FDD/floppymusic $
half nexus
#

I've changed out the midi, no sound

#

but at least it was worth transferring the collection

half nexus
#

Any other pin configurations?

#

I might tell some truth, I don't know much about GPIO. Only that it stands for General Purpose Input Output

half nexus
#

So, update till the next time:

Drive select indicator - working ☑️ (pin 12)
Drive power supply - working ☑️ (both USB and PSU)
Software - working without showing any issues ❓
Connection - unsure ❌ (used pins bcm21 -> fdd18 & bcm20 -> fdd20)
Motor - not in motion ❌

crystal jewel
#

however, I am having issues getting it to work with serial on my Pi 3, and so, once again - i ask if anyone can point me to what I may have overlooked; for memory, I am working with a UBlox R412m on the IoT 6 Click from Mikroe (https://www.mikroe.com/lte-iot-6-click) - my Pi 3 is freshly imaged from the latest Raspbian 32 bit lite; I've run raspi-config to disable console over serial and enable hardware uart

I have done a loopback test by shorting RX/TX and running minicom - with echo off, I am seeing my typed characters back on the screen, so it appears serial is ok

  1. Mikroe Pi 3 click adapter: https://www.mikroe.com/pi-3-click-shield
    • slot 1: the modem doesn't power up properly; slot 2 it looks ok (not sure why this is)
    • i ran the loopback test on slot 2
    • this should be ttyS0, but the modem doesn't respond to AT commands
  2. Mikroe USB Click adapater: https://www.mikroe.com/click-usb-adapter
    • enumerates and I see two ttyUSB ports
    • loopback test fails, so not expecting much and indeed nothing happens!
  3. adafruit Debug Console (https://www.adafruit.com/product/954)
    • on Pi3, it enumerates and i see ttyUSB0, but hooking up the IoT Click, no response from the click
    • on Mac with Silabs driver installed, the port is in Arduino IDE, but when hooked up to the click, no response
#

I can see anything ive missed... but wouldn't be the first time!

$ cat /boot/config.txt | grep -i uart
enable_uart=1

$ cat /boot/cmdline.txt
console=tty1 root=PARTUUID=342cd3a6-02 rootfstype=ext4 fsck.repair=yes rootwait

with the USB Click adapter attached

$ sudo dmesg | grep -i tty
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=Composite-1:720x480@60i vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=tty1 root=PARTUUID=342cd3a6-02 rootfstype=ext4 fsck.repair=yes rootwait
[ 0.001189] printk: console [tty1] enabled
[ 3.170649] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 114, base_baud = 0) is a PL011 rev2
[ 3.181690] 3f215040.serial: ttyS0 at MMIO 0x3f215040 (irq = 86, base_baud = 50000000) is a 16550
[ 9.908074] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0
[ 9.909199] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB1

#

On a side note, I'm also curious as to what solutions people use (and prefer) when hooking cellular modems up to Linux for data...

crystal jewel
#

ok, RTFM: - buried in the datasheet

image.png
#

and the schematic; VUSB_DET is held high (by default) by the (already populated) J4 0-ohm resistor

image.png
#

(I might recommend they look at their font kerning - 'c' and 'l' is a perhaps a little close with that font 'l')

in anycase, by the looks of things I need to desolder J4 to get the UART enabled... which I'm loathe to do as I use it mostly with USB; (cases like this I much prefer pin jumpers... might have to swap J4 for a SMD pin header instead)

image.png
#

but, what annoys me most is the documentation that says (for the IoT 6 Click) - which (at least to me) reads: "this device should communicate via UART by default; the USB port is only for diagnostics, not data"... no mention of j4... also

image.png
#

also, interfaces GPIO and UART!

image.png
crystal jewel
#

hrmm... ok no, I think i've misread the schematic here; since when I use Serial, VBUS from the USB port is not connected, in which case VUSB_Det is floating....

crystal jewel
#

ok! progress 🙂 (i realise I am probably talking to myself, but rubber duckying can be useful!)

#

using the Adafruit USB to TTL Serial Cable - Debug / Console Cable for Raspberry Pi I was finally able to get the modem to come up in the Arduino IDE under Mac - turns out, the cable provides 2 serial ports and of course i was choosing the wrong one

#

i had assumed it was the USBtoUART, but its actually the usbserial that works

image.png
#

dmesg -w and plug the USB to TTL Serial Cable into the Pi

image.png
#

interesting, on Mac i see 2 usb-to-serial ports, but on Pi I only see 1.... 🤔 does anyone know how many ports there should be under Linux with this cable?

#

connections (which worked on Mac)

image.png
#

a loopback fails though...

image.png
tired marsh
#

I think they are the same port, but /dev/cu.SLAB_blabla is the equivalent of: /dev/serial/by-id/usb-Silicon_Labs_CP2104_USB_to_UART_Bridge_Controller_01426E16-if00-port0

crystal jewel
#

@tired marsh cheers, interesting as one works, but not the other!

tired marsh
#

I know that the wch driver creates a second port (that works while the default one doesn't) so maybe it's the same situation

crystal jewel
#

yeah, that is what im leaning to as well

#

im told that its plug n' play on raspian... but perhaps thats changed

crystal jewel
crystal jewel
#

... ok, that's where Im gonna have to leave it for today; if anyone can think of any reason for this, id be greatful! I might need to pop over to the Raspberry Pi forums

steady rose
#

sudo apt purge modemmanager

crystal jewel
#

@steady rose thanks - I saw that in my log but chose to ignore it 😂

#

The reason being though…. ModemManager is part of what I’m testing… so if I have to remove it we might be in trouble!

#

Sorry for the rudeness of my question, but do you know of an issue between modem manager and serial?

steady rose
#

the general issue is modemmanager takes the com port, so other access gets blocked

#

didn't read all of the scroll back on this issue though, so possible im not understanding general issue.

#

how were you doing the loop back test?

#

with the adafruit USB cable?

crystal jewel
steady rose
#

that's wiring. what commands were run on the pi for the loopback test?

crystal jewel
#

Just shorted rx/tx and used minicom with no echo

#

When I do that with the onboard uart (pin 8/10) it works but not the Adafruit

#

And by work it echos back what type

steady rose
#

what specific OS are you running on the pi?

crystal jewel
#

Latest raspbian 32 bit lite

steady rose
#

did you change COM port to dev/ttyUSB0 in minicom? the UART on pins 8/10 would've been differnet.

crystal jewel
#

Yep, ttyS0 for pins 8/10 (or /dev/serial0) and ttyUSB0 for the Adafruit cable

#

115200 baud 8N1 on both

#

But I’ll take a look without modem manager and see how it goes 👍

steady rose
#

that'd still be my guess. i'm not familiar with minicom and how it might use modemmanager.

#

but there's no modem involved here, so it generally is not needed

crystal jewel
#

Cheers @steady rose it’s been a journey of discovery this one…
But can’t say I mind falling down a rabbit hole every now and again

crystal jewel
#

@steady rose finally managed to put some time aside and take a look - removed (and purged) modem manager - but no difference, sadly

on the other end of the serial cable though is a modem - specifically the U-Blox r412m

#

syslog

image.png
#

sudo minicom -b 115200 -D /dev/ttyUSB0
ctrl+a : e (echo on)

image.png
#

$ sudo cat /boot/cmdline.txt
console=serial0,115200 console=tty1 root=PARTUUID=9f28df8b-02 rootfstype=ext4 fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles

(bare in mind, im using a USB-serial, so the console on serial0 shouldn't be an issue - when I want to use /dev/ttyS0 then console on serial is disabled)

#

for the same reason, uart is not enabled in the config.txt - however in previous testing, i have enabled uart in config.txt and also removed the serial console

#

... but just unplugging the USB and moving it across to my Mac gets me this! 🤷‍♂️

image.png image.png
#

ill reverse the cable - take the USB on the Mac and then see if i can get a serial console from the Pi working; if that works then we can try and just send data between the Mac and the Pi over serial; ill have a dig around see if i can find something else that talks serial that I can plug in as well - maybe see if i can grab my scope from work and see whats coming out the serial port

gentle briar
#

It could be as simple as line ending characters, or something more complex and subtle involving format or (virtual) control signals

crystal jewel
#

@gentle briar - interesting; i can certainly try that; from the arduino IDE above im using both NL and CR - I can even put a full Pi OS and install arduino on it so it's like-for-like! and test that; though if it were then at least a loopback echo test should work (which it does on ttyS0.. hrmm)

I have a few other Pi's here as well so i can give those a test - maybe the add-ons are getting in the way (never had an issue before, but theres a first time for everything)

gentle briar
#

It looks like a weird and subtle issue, so I'm casting around for things I've seen in the past in similar situations

crystal jewel
crystal jewel
# crystal jewel

i am very confident that the serial lines are not conflicting (as I have been using this setup for years and this is the first time this issue has come up) but if the serial lines were causing an issue, then the ttyUSB should be fine still

gentle briar
#

You did mention the Silabs driver but it appeared to be an FTDI cable in dmesg, but it doesn't look like a driver problem, so I didn't comment on that earlier.

crystal jewel
#

and i have used the ttyUSB for talking to Arduino's in the past

gentle briar
#

I agree that it's likely not a conflict.

crystal jewel
gentle briar
#

I had been looking at your original post where you had ```
[ 9.908074] usb 1-1.4: FTDI USB Serial Device converter now attached to ttyUSB0

crystal jewel
#

yup. sorry for the confusion - the board i am using is a Mikroe Click - i have an adapter with a Mikrobus <-> USB adapter on it, and that one is FTDI (but it doesn't work either) -> so three different Serial interfaces (onboard, FTDI and Silabs) and none work

gentle briar
#

Since there's only one control line (DTR?), it should be easy enough to measure it and see if there's a difference

#

Amusingly, I have a Mikroe Click GSM board, but I think it's an earlier one.

crystal jewel
#

yeah, i have a GSM board around here somewhere actually... bottom of a draw, if i can find it, ill test that (the Quectel M95 iirc)

gentle briar
#

Having three serial interfaces available could be useful, you could hook up a third one (RX only, so it doesn't conflict with anything) to monitor the communications

#

Heh, I think mine's the same Quectel one

crystal jewel
#

its a good little module; shame about the 2G sunset but 🤷‍♂️

#

and if i can get my scope, i can probe the lines as well, see whats going on ... so a few tests to do still

gentle briar
#

A scope is invaluable for seeing details like stop and parity bits (I don't know if minicom has much facility for adjusting those, on the Mac end, I usually use CoolTerm)

crystal jewel
#

my scope is not high end (Analog Discovery 2) but it does do serial decoding, and is a brilliant low cost tool - an arduino can be great for this too actually

gentle briar
#

I had one weird problem (with a SCSI bus in that case) where I had the company rent an expensive SCSI analyzer that ended up hiding what was really going on, and an old fashioned oscilloscope finally pointed up the real issue.

#

An Analog Discovery 2 is a dandy tool for exactly such situations. Even this ancient 75-year-old PocketScope, which is the opposite of high end, is sufficient for serial debugging

pocketscope-arduino-serial.jpg
crystal jewel
#

right! my hacking time is over, kids are calling - ill run some more debugging and see where we get to! i have no idea what the root cause will be, but will be fascinating to find out... and im sure ill learn something new along the way

gentle briar
#

Let us know, I'm curious

crystal jewel
#

digging out the GSM module is a good excuse to clean and tidy the parts drawers

gentle briar
#

Heh, I know all about side quests like that!

torn trench
#

Rather than the arduino serial console?

crystal jewel
#

@torn trench no, not yet; grabbed the first serial application I had; I’ll add it to the test list - are you thinking something in minicom? Certainly possible - but never had an issue before

#

But I’ll try minicom on the Mac and Arduino ide on the pi 👍

torn trench
#

A bug in minicom seems unlikely, but maybe either tool has some weird default option that makes it work/not work

#

A long shot for sure though

crystal jewel
#

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.

edgy oar
crystal jewel
#

I assure you there is a better than 99% chance of user error … 😜

edgy oar
#

that's usually my twist. It was working the whole time, I just didn't notice.

gentle briar
#

I had that on a recent project, but I didn't notice because the middleware had a bug where it said the connection was inactive, so I didn't bother to query the database. When I did, I found out my system had been working for days and logging to the database all along!

edgy oar
#

hah. yeah, I really hate that. So much time spent spinning wheels.

edgy oar
#

anyone know what RPi4 firmware version (or rough date) included the automatic over_voltage scaling feature? I can't seem to locate the specific version.

crystal jewel
#

@gentle briar @edgy oar (she/her): it would appear the problem was hw flow control - so the prize goes to @gentle briar I think (#help-with-linux-sbcs message)

#

but also @torn trench @steady rose, @tired marsh thanks

#

I came in this morning, put a full version of Raspbian + Desktop on, and VNC'd in; Checking Arduino IDE, the Adafruit debug cable worked as expected - but failed in minicom still

checked all the different line endings, but no luck

installed pyserial, and ran a simple check, which didn't work as expected; tried ATCOM from SixFab though (which builds on pyserial) and that works with ttyUSB0

so at this stage, the adafruit cable works in python and arduino, but not minicom; ttyS0 is still dead - also pyserial-monitor doesn't see ttyS0

#

installed CoolTerm, it sees the ttyUSB0 (which works out of the box), ttyS0 doesn't even get detected

#

hooked the IoT 6 Click up to using just 5V, RX, TX and GND with ttyS0 - and that works in CoolTerm, minicom
back in minicom disabled hardware control and the adafruit cable now works

#

now, im not 100% sure what is going under the hood

  • something in the way the Mikrobus is implemented is not playing nice with HW Flow control; not sure what right now (but there is also another strange issue with my Mikrbus adapter's socket #1 - maybe pin conflicts)
  • minicom's HW flow control and the adafruit cable have some issue somewhere (or Adafruit, CoolTerm, Pyserial just ignore HW flow control by default)
#

the Adafruit cable being CP2102 based, I suspect my ESP32-DevKit C will have the same requirement (device is in use though, so can't test)
need to look at the FTDI device again and see what that looks like... but honestly right now, i will have to stop, as now it's working i have to get on with the main topic which is to get the modem over uart to come up in ModemManager

gentle briar
#

This is AdaFruit's 4-pin cable (product ID 954)? I'll admit, I had misremembered the pinout, I thought it was RX, TX, ground, and DTR, but you're right: it's RX, TX, ground, and +5V. No flow control at all. Many of the other USB-serial adapters are 6 pins, and add CTS and RTS (or DTR) for HW flow control.

crystal jewel
gentle briar
#

In the bad old days, we'd open a port with tip or somesuch, then use stty to manually call ioctl() to fine tune the flow control settings. I think CoolTerm shows you the signals using simulated LEDs. Now I'm curious as to what that 4-pin cable does with RTS/CTS/DTR, and the fastest way to find out may be CoolTerm.

#

I had originally guessed that the Mikrobus board was not answering because it wasn't seeing a flow control signal it wanted, but with a 4-pin cable, that's not an option, so now I'm thinking it's essentially the same problem, but on the other end: the receiving apparatus isn't accepting data because it isn't seeing the flow control signal it wants.

crystal jewel
#

i am not 100% sure, you would think that the Mikrobus Click HAT (made by Mikroe) and the IoT 6 Click (made by Mikroe) would play nice together - maybe they do and im just missing something - I never found my GSM Click, but here it is (from 2019) plugged in an working on the same Pi Click hat

image.png
#

i am curious as to what lies beneath, but yep - sadly have to shelve that for now; if i can get MM working quickly, ill come back 🙂

but the funny thing is using ttyS0 from the Pi Click Hat always failed. even if i disabled the flow control in the terminal software... but its also behaving strangely with both click adapters

gentle briar
#

I suspect the HATs just use an onboard UART on the Pi that may be RX/TX only, but I haven't played with those (I normally just plugged the Mikrobus boards into a breadboard and ran signals to them with jumper wires).

homer-breadboard-early-scaled.JPG
#

It does include an ADC chip, attached to the I2C bus, but the RX/TX signals are just passed through, and the RTS pin just goes to CS0 and CTS to INT, so they would only be switched/monitored if the software chose to do so.

crystal jewel
#

my suspect is the pi hat, as slot 1 is misbehaving (though the symptoms dont make sense either!)

the IoT 6 Click has a power button for powering on/off the modem; in slot 1 of the click hat, the button doesn't work... but slot two it does. but using rx/tx/5v/gnd from either slot works... so, go figure!

gentle briar
#

That kind of board draws some serious power spikes, so I always powered them with a beefy separate supply

#

I don't think it's a compatibility issue per se, but some communication software making some assumptions

crystal jewel
#

the modem clicks? yes, esp. the 2g versions (this is LTEm)

crystal jewel
#

.... and ill report back!

edgy oar
#

@crystal jewel Thanks for the update!

#

I have that adapter too and haven't had issues with tio or termius

#

Did have a weird issue at first though -- had cmdline.txt and config.txt set up for uart and serial console. Despite having same 115200 baud and 8n1, I would just get strange characters on the screen as if the baud rate was wrong.

#

Eventually gave up and reinstalled raspian and it worked fine. No idea what was goofy with that.

crystal jewel
#

$ mmcli -L
/org/freedesktop/ModemManager1/Modem/0 [u-blox] SARA-R412M-02B

#

Boo yeah... thats a GOOD end to monday... took me less time to debug the udev rules to get MM to recognise the serial port than to fix the ttyS0 (this is running on ttyS0)

lost wolf
#

Is the Pi Zero 2 W is beefy enough to benefit from a "nicer" (faster) SD card? Or is there no point in bothering?

hard pike
lost wolf
#

Hah!

hard pike
#

I believe it supports faster SD peripheral speeds so it might be worth the investment

lost wolf
#

Rad ok. Thanks.

hard pike
#

If it was just the Pi Zero W I’d say save the money, but being a Pi Zero 2W definitely should have at least marginal benefits

lost wolf
#

Excellent.

lost wolf
#

Ok, so, I'm using the RPi Imager. I have a display set up, but no keyboard options at the moment. I have a Bluetooth keyboard, but it looks like I need the OS up and running, and some other kind of HID input to connect it. I'm missing the dongle on my RPi-setup keyboard because someone was using it for something else. 😖

#

Need USB Micro to A-socket adapter, and while I know I have a number of them, none of them are to be found.

hard pike
#

Schrödinger’s USB dongle

steady rose
#

@lost wolf you looking for a work around?

lost wolf
ruby night
steady rose
#

you'll need OS GUI for getting the BLE keeb working? or just eventually?

lost wolf
#

Maybe both, but mostly eventually. So I need a keyboard that works so I can navigate the OS.

lost wolf
steady rose
#

if you can get things working via CLI, then SSHing should work

#

if you do need GUI - then, VNC

lost wolf
#

Ok so, wait. Can I connect a Bluetooth device via command line through SSH?

#

Because I have a display....

#

So in theory I can hook up the display, log it into the GUI, then SSH in, connect the keeb, and have it work?

#

I have no clue how to command line connect a BT device though.

steady rose
#

yes. in theory.

#

i've never gone thru that though

#

i'd think possible using bluetoothctl

lost wolf
#

Fair enough. Display does not seem to be working and pinging it isn't working either for SSH. Wait, I did not plug USB cable into "pwr in" plug. Trying that. Nope, still nothing. By "nothing" I mean no ping and no display. (Display might be a display issue, not a Pi issue.) The green power LED comes on and blinks a bit, but eventually turns off.

ruby night
#

I did confirm that you can set the VNC resolution via ssh in rasp-config

lost wolf
#

Thanks @ruby night

#

Power USB cable is plugged into a wall thing with multiple USB ports.

ruby night
#

so you should be able to set it then enable VNC and be able to bring up the GUI.

#

you enabled WIFI and ssh in the imager, correct? then you are trying to ssh to pi@raspberrypi.local?

lost wolf
#

I renamed it, but yes. I'm reimaging it in case I typoed something the first time.

#

Took screenshots of the setup to verify

ruby night
#

"should" work 😉

#

Sorry, I have to go, but it "should" work... I have done it many times. Good luck.

lost wolf
#

Thanks Jerry!

lost wolf
steady rose
#

also note you can do a lot of settings when burning the image

lost wolf
#

Wondering if it's not successfully connecting to the WiFi.

steady rose
lost wolf
#

I renamed it, enabled SSH with a password, gave it a new username, enabled WiFi.

steady rose
#

oh...they also turned off the default account

lost wolf
#

And did localisation.

#

So I'm trying to log into newname.local

#

or ping it even

#

I used my 2.4GHz WiFi because that's what micros need. Should I have used my 5GHz?

#

Or could I have used it?

steady rose
#

2.4 should be fine

lost wolf
#

🤷🏻‍♀️ Worth asking I guess.

steady rose
#

you're doing all the config setup via rpi-imager?

lost wolf
#

yes

torn trench
#

I’m not sure whether the zeros even work with 5GHz?

torn trench
lost wolf
#

I plugged in another display that I know doesn't need drivers, and it's not getting any signal either

torn trench
#

Hm. How’s the LED on the board?

lost wolf
#

Checked our WiFi, it's not connected to it.

lost wolf
torn trench
#

if you have a serial cable handy, you might be able to see some stuff on the console

hard pike
#

Serial SSH

#

It’s super handy

torn trench
#

I believe the light should stay on. So it kinda seems like it must be failing to boot

#

I don’t believe simply having the wrong wifi connection info should cause that. Could be worth trying a different SD card

#

What image are you writing with rpi imager?

lost wolf
#

This is the first time using this Pi. Maybe it's bad.

lost wolf
steady rose
#

what model pi?

lost wolf
#

Zero 2 W

torn trench
lost wolf
steady rose
#

if you put the SD card back in your PC, do you get a boot folder to show up?

torn trench
#

0w2 is 64 bit iirc?

#

Although I thought you could still run 32 bit OS on it

hard pike
#

It should work with 32b

lost wolf
#

I'm happy to try 64

lost wolf
steady rose
#

32b should be fine

lost wolf
#

Takes like 5 minutes to redo. 🤷🏻‍♀️

steady rose
lost wolf
#

Hmm.

steady rose
lost wolf
#

Yes I see that.

#

Still worth trying, I guess.

#

I don't know.

steady rose
#

it's something else

lost wolf
#

I get a splash screen on this display. Then nothing.

#

Light is blinky for a bit then shuts off

#

It is not connected to my WiFi.

steady rose
#

how long did you wait after initial power with the fresh SD card inserted into the pi?

lost wolf
steady rose
#

yep

lost wolf
#

It was plugged in for 5-7 minutes or something when I asked for a list of things connected to the WiFi. From the router.

#

I've tried pinging sooner, but realised I should wait. So I tried pinging later, and still.

steady rose
#

hmm. that should be enough. the initial boot can be a bit long-ish.

torn trench
#

how are you powering it?

lost wolf
#

USB to wall. Apparently the LED is a boot activity LED, not specifically power on the Zero 2 W?

steady rose
#

yep

torn trench
#

ah ok, I was looking at my 0w (not 2) to see what it did

#

and it was on the whole time. But sounds like maybe it's different on the 2

lost wolf
#

Found an adapter and keyboard btw.

#

Didn't change anything.

steady rose
lost wolf
#

Ok I'll try it.

torn trench
#

I think that's the same thing rpi-imager does

lost wolf
#

I recall it not playing nice with MacOS, but maybe it's better now.

steady rose
#

a little different

#

should be ok with mac, the boot partition is pretty generic

torn trench
lost wolf
#

So create the wpa file on the boot drive. It's full of .dtb files. Am I seeing the right part of it?

#

That was the issue before is that MacOS would boot part of it but not all of it

#

or something

torn trench
#

that sounds about right to me

#

is there a file cmdline.txt?

#

there are two partitions, one is /boot and the other is the root filesystem

#

you should be able to mount /boot on a mac because it's FAT formatted, which is pretty universal

lost wolf
#

Oh right ok

torn trench
#

root is ext4 formatted and you would probably need a special program to mount it on a mac iirc

#

but you should be able to add the files to /boot, and on first boot they'll be copied over

steady rose
#

yep. several .dtb files.

torn trench
#

I believe this only works on the first boot though

#

(been a while, could be wrong)

steady rose
#

should def see cmdline.txt and config.txt as well

lost wolf
#

Yes.

#

I do.

steady rose
#

yep. that's it.

#

just a simple text file then

lost wolf
#

It's .conf tho right?

#

It's created.

steady rose
#

name needs to be exact

lost wolf
torn trench
#

I think wpa_supplicant.conf and if you want ssh you can just add an empty file named "ssh" or something?

steady rose
#

wpa_supplicant.conf

#

and the boiler plate example should work

#

just change SSID and PASSWORD

lost wolf
#

Now put it back in the Pi?

#

Why won't it show booting up on the display though?

#

I thought that was a thing.

steady rose
#

cable/edid stuff/drm stuff/etc

#

displays can be finicky

lost wolf
#

Tried 2 cables now.

#

It shows the splash screen

steady rose
#

it may be trying to do something else after that, and getting wrapped around axle

lost wolf
#

How long do I wait after powering it.

#

It's not showing up in the client list on my network.

#

Which it wasn't before either.

steady rose
#

minutes-ish

#

esp. with the mdns stuff. can be quirky.

lost wolf
#

yes but I really don't want to do that.

#

I wanted this to be super compact.

#

Project doesn't need the headers. sigh.

#

I'm going to grab another Pi and see if it boots.

steady rose
#

i'll run thru a setup real quick also just to see if there's anything obvious

#

i'll change hostname, etc.

lost wolf
#

Same behavior. I'm trying a different SD card now.

#

Uff.

#

If it was the card all along I'm going to feel rather defeated.

steady rose
#

do you have other pi's on your network with hostname raspberrypi?

lost wolf
#

nope

steady rose
#

have you connected to pi's before with the hostname.local approach?

lost wolf
#

IT LIVES

#

Showing up on display

#

Give it a minute here to see if everything works.

steady rose
#

this was just with SD card change?

lost wolf
#

It at least mentioned generating SSH keys and some other thing

#

Also 64 bit.

#

Now it is again not doing anything.

#

Hmm.

#

So we got 1 mm further.

#

Apparently.

#

Sigh.

#

Now it's back to splash screen and then nothing on display.

#

I guess it probably did the other thing the first time and I didn't have a working display hooked up at the time.

#

So I don't think we actually gained anything.

#

The other Pi did the same thing though

#

So I am thoroughly confused.

torn trench
#

interesting, so you're seeing the systemd boot logs on the screen?

#

and then it goes blank?

#

do you know what the last thing you see is? An FTDI usb-serial cable could be pretty useful if you have one

lost wolf
#

OK, so the FIRST time it started up, it showed screens about generating SSH keys and some other thing. Not command line scrollback, but ASCII outlined little windows.

#

Then it goes blank.

#

Reboot, splash screen shows on the display, and then nothing.

torn trench
#

hm, interesting... I almost exclusively do headless stuff with them so I don't know much about how the displays work

lost wolf
#

Well display or not, it should be doing something, shouldn't it?

#

It's clearly not booting properly.

torn trench
#

I think that's likely, but hard to be 100% certain. I'm not sure it's entirely ruled out that it's booting up, but there's some kind of wifi issue and display driver issue.

#

it's certainly true that there's not much evidence that it's booting up correctly seeing as it's not connected to wifi and the display goes blank

hard pike
#

Why not start with a bare configuration?

torn trench
#

I think there are like, different display modes or something. At some point your window manager is gonna take over the display, and that's a possible point where things are breaking down

lost wolf
#

The giant 🤯 for me is that it does the same thing on the big Pi now.

hard pike
#

Just SSH, no Wi-Fi, no display

torn trench
#

ssh with no wifi?

lost wolf
#

How do I SSH into a Pi with no WiFi.

torn trench
#

would be hard on a zero w 2 🙂

hard pike
#

Serial ssh

steady rose
torn trench
#

that's just serial, no ssh, isn't it?

lost wolf
#

There aren't headers on it and I'm not putting any on.

#

I have a regular Pi here too tho

hard pike
#

The USB ports allow you to ssh over serial

lost wolf
#

Which I guess has ethernet

#

oh

#

fair enough

hard pike
#

Just use putty or screen on a Mac terminal

torn trench
#

in ethernet gadget mode?

hard pike
#

Nope, Serial SSH

lost wolf
#

Does it mount?

hard pike
#

you should at the very least get a serial port

#

on your computer

lost wolf
#

uff.

#

ok

hard pike
lost wolf
#

Yeah I understand

hard pike
#

from putty just change the serial port and speed to 115200 at least

torn trench
#

I'm very confused by the term serial SSH. You can definitely do serial over USB though. It would require a bit of tinkering with the config.txt I believe

#

I'll try and dig up the changes needed to use the USB port for serial...

hard pike
#

you shouldn't need to do any changes

lost wolf
#

I'm not seeing it anywhere.

hard pike
#

Ah wait

#

Follow this

#

You need to change like a few small things in the config

#

My brain was defaulting to Debian on a beagle bone 🙂

#

It has SSH over USB enabled by default

#

Very convenient

torn trench
#

that is using ethernet gadget mode fwiw

#

(g_ether in the modules load)

hard pike
#

Eh, names don’t matter here; it’s the mental concepts that matter 😆

#

TIL, thank you andy

torn trench
#

I'm curious though, how it's gonna get an IP address

#

hm looks like it's using zeroconf. Maybe a link-local address

hard pike
#

Same way you get an IP on an unconnected network? Self assigned local Ip 169. Something

lost wolf
#

I followed the steps. It shows up in my USB Device Tree for a short time and then goes away.

#

The steps did not work, there is no response.

#

Why this time. Why is it all buggered this time. I've never had so much trouble with a Pi. Ever.

hard pike
#

Do you have any other SD cards to try?

torn trench
#

I believe these instructions should enable a serial console over the USB connection on the pi, rather than over the UART (which you'd need headers and an FTDI cable to use)

lost wolf
#

From the initial one.

torn trench
#

it's also, I suppose, a possibility that the board is damaged or something. But personally I'm optimistic that a serial console (whether USB based or UART based) could get some more information

steady rose
#

@lost wolf the rpi-imager route did not work for me either. not sure why, although it did leave out the country code in wpa_supplicant.conf for some reason. however - i got it working by moving SD card back to PC and manually making a new wpa_supplicant.conf and then rebooting with that in the pi.

lost wolf
torn trench
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I had issues with the example wpa_supplicant once. I will try and find the one that worked for me

steady rose
#

sort of - i had made attempts immediately after using rpi-imager

lost wolf
#

OK let me try that set of things.

steady rose
#

i attached a console cable to be able to get in and check things outs

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then did the manual file edit trick

lost wolf
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card not mounting now. Trying a new new one. 🙄

steady rose
#

this time don't do any of the config in rpi-imager

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just burn the image

lost wolf
#

Already clicked go with the config stuff still in there.

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I'll try this once

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and then do it without if this still fails again

steady rose
#

ok, before moving SD card over, can sanity check what's in the firstrun.sh script it'll generate

lost wolf
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Moving over to Pi you mean?

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So remount it on my Mac and check that

steady rose
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check these lines:

cat >/etc/wpa_supplicant/wpa_supplicant.conf <<'WPAEOF'
country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
ap_scan=1

update_config=1
network={
    ssid="mynetwork"
    psk=69e49214ef4e7e23d0ece077c2faf3c73f7522ad52a26b33527fa78d9033ff35
}

WPAEOF
chmod 600 /etc/wpa_supplicant/wpa_supplicant.conf
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before moving to pi

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just open on mac

lost wolf
#

Imager unmounts when done

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so I need to remount it first

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but will do

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@steady rose So run cat >/etc/wpa_supplicant/wpa_supplicant.conf <<'WPAEOF' from the boot directory?

steady rose
#

just checking file contents. open in text editor. make sure it nominally looks like above.

lost wolf
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ok

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Wait.

steady rose
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it'll have more. but those are the lines creating the wpa_sup file

lost wolf
#

There is no /etc

steady rose
#

doesn't matter - it's there after boot

lost wolf
#

omg

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I was looking for the wrong file

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ok ok ok

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give me a moment

steady rose
#

/boot/firstrun.sh

lost wolf
#

yeah I figured it out

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eventually

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Looks the same to me

steady rose
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has a country line?

lost wolf
#

country=US

steady rose
#

yep

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ok. i guess try booting with that.

lost wolf
#

uff.

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Wait weren't you saying manually generate a wpa_supplicant.conf file?

steady rose
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yes. but now you have firstrun that will interfere and try to do the same thing

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guess could just delete it

lost wolf
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hmm

steady rose
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and go other route

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rpi-image also doesn't add a scan_ssid=1 line

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i'm trying to work backwards and break it now

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to find out why the rpi-imager route did not work

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hmm. yah. if i remove that one line. it's back to not working - not connecting to my wifi

lost wolf
#

hmm

steady rose
#

add it back. reboot. it works.

lost wolf
#

Interesting.

steady rose
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the psk being hash vs. plain text doesn't seem to matter. works either way.

lost wolf
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I have an idea, trying it one more time.

steady rose
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ok, but you tried a manual wpa_sup file and that didn't work either

lost wolf