#help-with-linux-sbcs

1 messages · Page 9 of 1

torn trench
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fwiw you can use the USB on the pi for serial or ethernet with the dwc2 driver

hardy plaza
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This reminds me of a news story years ago about this new French Fry product (may still be on the market, dunno) where they'd invented a factory process to inject beef fat into the center of each fry so that each one had 4 grams of fat. So a whole plate of them would be like a week's worth of fat. And the quote from the beef industry guy was: "if we could figure a way to get beef products into ice cream, we'd do it." His job was to sell as much beef product as possible. And to me, that's the same with the petroleum industry: the more plastic used the better for their industry. And to me, that's why I don't particularly like the whole 3D printing industry...

hardy plaza
torn trench
#

I guess I'm thinking of the Pi Zero, where you can power it via the USB port

hardy plaza
#

You'll note that on the power connector, none of the data connectors go anywhere.

torn trench
#

Can't you power it over the data connector though?

hardy plaza
#

No.

torn trench
#

I'm about 95% sure that works on the Pi Zero

hardy plaza
#

That is the power connection for the Pi. If it works on the Pi Zero it might be back-powering the board but you'd be bypassing the normal power circuit, not a good idea.

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You'll note that the Pi Zero still has two micro-USB connections, one labeled PWR, the other labeled USB. Ignore those at your peril.

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If you power the Pi Zero from the DATA port you'd be using it in USB gadget mode, and you'd not want to have any power coming back over the USB hub or you'd be back-powering it, so in this particularly instance you'd have to be using a non-powered hub (you would want a common ground connection). You really don't want two power supplies contending on the same board. Put it this way: unless you actually know what you're doing I'd just follow the directions on the label, etc. And to my understanding this is not what the OP was asking about. I believe it was about data transfer over the USB ports (please correct me if I'm wrong).

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In very brief: you never want to inadvertently connect two power supplies together, which is a possibility if you connect two computers via USB if you're not being careful.

hardy plaza
#

I think a lot of people don't realise this, but the official power requirement of all Raspberry Pi models is actually 5.1 volts, not 5.0 volts. The operating range of the Pi is 4.75 to 5.25V so a standard 5.0V USB power supply will work, but under a load it can't handle (i.e., it cannot supply enough power) the USB supply may drop below 4.75V and cause the Pi to reset. This kind of under-supply (effectively a "brown out") is a very common cause of a lot of issues I've seen on various online forums.

The RPi official power supply wart provides 5.1V. Connecting an official Pi supply to a Raspberry Pi and mistakenly connecting that Pi to a desktop computer's USB (which is 5.0V) would be causing the Pi's supply to back-power the desktop, potentially damaging either or both systems.

faint sparrow
#

I was looking at pyusb/libusb for adressing ports, to send keyboard-like inputs, but I see no reference.. is it a correct library to use in such use case?
Ie using a vegetable pi board as a keyboard

hardy plaza
# faint sparrow I was looking at pyusb/libusb for adressing ports, to send keyboard-like inputs,...

I don’t understand the intent. Why would you send “keyboard-like inputs” rather than the text that tapping on a keyboard would generate? You want to send the actual keyboard codes over a serial port?

As to using a non-Raspberry Pi to do this, that is a different question but basically comes down to whether you can install whatever OS and Python libraries you need on it. I don’t have a specific answer, you’d have to try it out to find out.

faint sparrow
hardy plaza
zenith crystal
#

i'm a bit lost on this one and i can't find anything that resembles this: if i have a Crickit Hat and "anything" connected to the I2C bus on a Raspberry Pi 4, it's hit or miss whether or not i get an SMBus Errno 121 -- any suggestions?

stupid power switch possibly -- either that or taking it all apart and putting it back together "did something" 🙄

strong barn
#

taking it apart and putting it back together is the EE equivalent of

zenith crystal
#

been there, done that, got the t-shirt, burned it 😈

#

heck, i programmed on windows 3

sand basin
#

Hi everyone. It seems to happen the "Keyboard" in usb_hid class is for sending out the characters only. The "pressed_keys" attribute does not exist anymore. It would be highly appreciate it if someone would make a tutorial about how to get pressed keys from a usual USB keyboard connected to RPI in Circuitpython. I appreciate any idead. Thanks a lot in advance.

strong barn
#

Is the keyboard running circuitpython, or the RPi, via blinka?

sand basin
#

The keyboard itself is just a usual usb keyboard which is being used with a PC or MAC.

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On my RPI zero W, the circuitpython is running and the adafruit hid is installed. The "pressed_keys" attribute does not exist in the latest version.

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even "key_count" attribute is not there.

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for example this code is not possible to run:

#

import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS
from adafruit_hid.keycode import Keycode

import time

Create a keyboard object

kbd = Keyboard(usb_hid.devices)
layout = KeyboardLayoutUS(kbd) # We're using a US layout

while True:
try:
# Wait for a key to be pressed
if kbd.key_count > 0: # Check if any key is pressed
key_event = kbd.events.get() # Get the key event
if key_event.pressed:
# Decode and print the key pressed
char = layout.keycode_to_ascii(key_event.keycode)
print("Pressed:", char)
time.sleep(0.1) # Give some delay to avoid excessive prints

except Exception as e:
    print("Error:", e)
strong barn
sand basin
#

not really. This guide is showing how to read a switch connected to RPI pins. I am talking about a usual USB PC Keyboard got connected to the USB port of RPI. I want to read out each characted pressed on the keyboard.

strong barn
#

Maybe I'm misunderstanding something, but I don't think the adafruit_hid library is what you're looking for then. It is for emulating HID devices, not reading from them.

sand basin
#

I think you are right. I do not know what library coud do this job then?

strong barn
sand basin
#

Thanks a lot. I'll check it out.

#

Searching for dependencies for: ['keyboard']
WARNING:
keyboard is not a known CircuitPython library.

strong barn
#

Why are you running circuitpython on the rpi? It's perfectly capable of running full-fat python

sand basin
#

Because of many other libraries available in circuitpython for my hardware project.

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I do not need an operation system for my project

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I thought circuitpython can do what I need but apparently it is way limitted than man thinks.

solemn finch
#

bare metal CircuitPython on the Pi isn't stable because it isn't often used

sand basin
#

How about micropython?

solemn finch
#

micropython doesn't support it at all

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just like you don't want an OS because you are doing something simpler, a microcontroller is simpler than a SBC

sand basin
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I thought using those libraries speed up the process

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but it is quire limitted

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Thank you so much

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have a nice day/evening

solemn finch
#

you too! sorry it didn't work out

sand basin
#

No problem. At least I know this is not my way. I work with STM32 MCUs a lot. I just wantet speed up my own private projects. No problem. I will go on with ST.

hardy plaza
#

I know this isn't exactly a beginner's task but I looked into the CPython keyboard library and its dependencies don't look like porting it to CircuitPython or MicroPython would so difficult (keyboard-0.13.5/keyboard/__init__.py):

import re as _re
import itertools as _itertools
import collections as _collections
from threading import Thread as _Thread, Lock as _Lock
import time as _time

The only one there that isn't currently available in MicroPython is itertools, and I wrote a simple port of that myself (which I'm happy to share if asked).

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But I do agree: if you're working on a Raspberry Pi there's little reason not to use CPython ("full-fat" Python).

velvet frigate
#

I found something weird on the latest bookworm os, not sure if its just me being weird or the os is being weird. I need to export DISPLAY=:0 for my code to use the display so I set it in /etc/environment, only problem is on reboot the desktop wont load with it set in there, I removed it and it booted fine.

strong barn
velvet frigate
zenith crystal
#

is your code running as the same user as the desktop? you should only need to set that variable if your trying to access the "local" display, which has to be set up first (which is why the boot fails)

velvet frigate
#

I'm working with the demos here, im running as the same user. I only need to set the display when im ssh'd in https://github.com/raspberrypi/picamera2/tree/main/examples/hailo
when i run the program it says this when it starts
QStandardPaths: wrong permissions on runtime directory /run/user/1000, 0770 instead of 0700

GitHub
picamera2/examples/hailo at main · raspberrypi/picamera2

New libcamera based python library. Contribute to raspberrypi/picamera2 development by creating an account on GitHub.

zenith crystal
#

yes, you would need to only use that when using SSH -- have you tried using the camera directly from the desktop?

velvet frigate
#

Yes that seems to be ok but I'm typically using ssh and want to find a way to fix that. The examples are flawed so I am rewriting them and adding recording, the way they were written the overlays are not exactly where they are supposed to be, my version uses a lot more processing power to resize and pad the frames and then resize and scale the overlays so that I get a 1080p video with accurate overlays
https://gist.github.com/matt-desmarais/b67a1bf378543a86c2eb0f3c8b57c1ca

Gist
hailo detect

hailo detect. GitHub Gist: instantly share code, notes, and snippets.

strong barn
#

I would try to set it when you launch your code, instead of in /etc/environment

zenith crystal
#

launching desktop apps via SSH is actually kind of nasty, as you've found -- i think you may be approaching this somewhat backwards, so if you can explain what you want to do...

humble marsh
#

from @green dagger :

What is the absolute minimum to get a pi zero connected to my laptop ?

#

The absolute minimum is to use wifi

green dagger
#

k will read - how about things to purchase ?

https://www.adafruit.com/product/2885

Pi Zero Protector
USB Console cable
TBD OS microSD card

Goal is to plug into laptop and play with OS on the Pi. No need for WIFI, Camera, other stuff.

will read the article and check out the wifi zero also

Raspberry Pi Zero - Version 1.3

At first glance, the Pi Zero isn't much.  It just looks like a slimmed down version of the Raspberry Pi we know and love.  But when we started to think of the possibilities - ...

humble marsh
green dagger
#

https://www.adafruit.com/product/5291

So I can just power it and wifi into a console from my laptop ? ssh in ?

Raspberry Pi Zero 2 W

Raspberry Pi Zero 2 W is the latest product in Raspberry Pi's most affordable range of single-board computers. The successor to the breakthrough Raspberry Pi Zero W, Raspberry Pi Zero 2 ...

humble marsh
#

The console cable is not necessary for the Pi Zero as noted in the tomshardware link above.

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@green dagger ^

mystic light
#

if for some reason the network setup on the initial SD card install doesn't work, then you'll at least want to hook the RPi up to a monitor to see what's going on

humble marsh
strong barn
#

don't get the cables, get the adapters. An HDMI cable is endlessly useful, a micro/mini HDMI cable on one end and full size on the other just ends up annoying

green dagger
#

ok yeah the wifi zero for sure - the way my desk is set up there is barely any room on the right of my laptop for USB cable to Circuit Playground Express - so its difficult to use, hits my mousepad...

But then ill need to buy power for it... ok. will review.

zenith crystal
green dagger
#

Ok, have the console USB cable for CPX, Have a phone usb power supply and even have a case (though it is a plastic Gelato jar 🤣 ). So I think all I need is Pi Zero 2 W and a microsd card. Got it on how to install the OS. (ack to HDMI, but for now, just get it running to ssh in over wifi).

If it is allowing ssh in over wifi from laptop, can I also use wifi out to install OS updates and software ?

That would be exceptionally convenient.

humble marsh
green dagger
#

and last question - I want to connect the CPX to the PI to use the CPX for sensors and output. Any thoughts in the large on this ? I am good with low level coding.

humble marsh
#

that is more convenient than using the REPL serial

green dagger
#

Thanks.

humble marsh
#

it predefines a bunch of packet types you may want

vernal abyss
#

I made a very fun mistake on my Raspberry Pi Zero 2w and I'm hoping there's a solution that I've missed. I have a python script running at startup that waits for a signal from another board, takes a video, then shuts the Pi down (it's running on a small battery and I want to be careful not to let the battery die before powering the Pi down properly). I took out the condition of waiting for a signal from the other board to debug something, so now the script goes right through and turns the Pi off immediately after the video and I don't have a chance to open the startup script and change anything. Is there a way to pause the script or boot the Pi up without running the script?

humble marsh
vernal abyss
#

@humble marsh That's helpful thank you! I'm able to view what's on the SD card now but it's mounted as read-only, so I can't edit the offending file. Both posts you've linked have people with the same issue but their solutions aren't working for me. When I try to remount the SD card to read-write in the bash terminal on the Pi I get "mount: bad usage" and I don't know where to go from there.

humble marsh
#

you could just try sudo mount, or sudo su temporarily and then mount and edit it

vernal abyss
# humble marsh did you put the card in another rpi, or swap cards and you're using a card reade...

I put the SD card into an SD card adapter on my Windows PC and modified cmdline.txt with "init=/bin/bash" so that the Pi wouldn't run init programs when it starts up. The only other Linux computer I have is a Raspberry Pi Zero 1.3 and it won't boot at all with the SD card (this was an issue before I made the mistake with this python script)

Those sudo commands both return "sudo: unable to resolve host (none): Name or service not known" I'm guessing because the Pi is running without init programs

humble marsh
vernal abyss
humble marsh
vernal abyss
torn trench
#

Can you interrupt the boot via graphical or serial console?

torn trench
#

I think using sudo may not be necessary since you are probably root?

arctic pawn
#

hello, today out of nowhere my raspi code started spamming me with this error:
Can't set realtime thread priority=99: Operation not permitted.
You are probably not running as root ?
This will seriously mess with color stability and flicker
of the matrix. Please run as root (e.g. by invoking this
program with sudo), or setting the capability on this
binary by calling
sudo setcap 'cap_sys_nice=eip' /usr/bin/python3.11
Press CTRL-C to stop sample

my project is an LED matrix controlled by arduino connected buttons

whenever i click a button it displays this sometimes it crashes sometimes it works

whats going on?

humble marsh
arctic pawn
humble marsh
#

did you reboot? Did you do any apt upgrades?

arctic pawn
#

After the error

humble marsh
novel pilot
#

I'm trying (unsuccessfully) to have my Pi (3 and 4) communicate with the USB-version of the SHT41. I'm able to listen to it via cat /dev/ttyACM0, but it doesn't show up when I do i2cdetect -y 0|1. I see output, but nothing on x44. My goal is to be able to set the precision and turn the neopixel off (no preference on the code doing it being python or bash or C).
When I run the regular code, like on https://learn.adafruit.com/adafruit-sht4x-trinkey/circuitpython-sht4x-demo, I get ValueError: No I2C device at address: 0x44.
My question is do I need to focus on:

  1. Getting the SHT41 USB to show up on i2c, or
  2. Rewrite the code to connect some other way (serial?)
steady rose
#

it won't show up in i2c scan

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the sensor is not directly connected to the pi's i2c

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the demo code from the guide is meant to be run on the trinkey itself, not the pi

novel pilot
#

Thanks @steady rose . Do you think there's a way to make the python library talk to it via the USB, or would I be better off opening the serial port and writing/reading directly?

steady rose
#

are you wanting to get the SHT4x sensor data onto the pi?

novel pilot
#

I'd like to turn the neopixel off without soldering, and I'd like to see if changing the precision/heater improves the temp accuracy

steady rose
#

to do that, modify the code running on the trinkey

novel pilot
#

Makes sense. I'd do that in My and CircuitPython, right?

steady rose
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yep

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or arduino

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can program the trinkey either way

novel pilot
#

The things I do to send more useful data to my MagTag🤓 Thanks for the guidance!!

steady rose
#

if you're wanting to get the SHT4x sensor data onto the pi, then a SHT4x breakout would be a better option

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that would be directly connect to the pi's i2c, show up in i2cdetect, and program would be running on the pi itself

novel pilot
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I was hoping to have it run about 10' away from the Pi, and that's where the USB cabling seemed safer

steady rose
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yah, that's long-ish for i2c, but could possibly work

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could setup a secondary data serial port to send the data

novel pilot
#

I like your idea of programming the trinkey directly. Nice to have multiple options! You've been awesome, thank you so much!

steady rose
#

np. for the trinkey, programming it is the only option.

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something has to be running on the trinkey

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no way to directly access the SHT4x over USB

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the program running on the trinkey will have to act as an intermediary

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and that can be done any number of ways (up to you)

mystic light
rotund pivot
mystic light
#

yup, those

novel pilot
#

Reprogramming in Trinkey directly was the perfect solution. Everything works great now. Thanks all!

dense osprey
#

I got a bit of a specific problem:

  • I am running a windows application on linux. (Inside docker)
  • that windows application requires a license key (which I bought), a user name and a serial number
  • the serial number is "randomly" generated for each system. So it is kind of bound to the license key.
  • the problem now is that when I generate a new docker image/update things etc. it reinstalls everything but now the windows application shows a different serial number => the previous license key does not match anymore.

Is there some way I can kind of "freeze" the serial number somehow? (At the moment I have to message the windows app developer each time to change it but at some point they will probably stop responding to me due to spam 😄 )

waxen valve
hardy plaza
waxen valve
dense osprey
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I don't want it to change on each build

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Basically it reinstalls the software and then it shows a new serial number at the moment

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Which I somehow need to avoid

waxen valve
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which is basically half the job of pirating the software, and why DRM is a pain even for paying customers

dense osprey
#

ah bummer - I thought I could somehow tell docker/linux to freeze that part somehow

waxen valve
zenith crystal
#

do it it two pieces -- the first Docker image you create is one that "installs the software"; then you use that image as the basis for your noodling

strong barn
#

Contact the developer and ask them for guidance? They probably have some idea for build/test purposes

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@dense osprey though I'd think about switching to a VM and just maintain that, it seems like that's the paradigm that the dev expects

dense osprey
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Yep talked to the developer - they mentioned I would need to keep the MAC address static somehow

strong barn
strong barn
#

When doing AI/computer vision projects on a RPi 5, how much would you expect the system RAM to make a difference, esp if using an AI accelerator like the Coral?

turbid rivet
#

@wheat pelican moving here because raspberry pi. Did you enable the serial interface in the raspberry pi configuration?

wheat pelican
wheat pelican
#

well, this is what I did.

Would you like a login shell to be accessible over serial? No
Would you like the serial port hardware to be enabled? Yes

ruby night
steady rose
#

^^that. featherwings are not designed to be used with pi's. so need info on how this was done.

wheat pelican
wheat pelican
#

I'm just trying to test this bad boy out. I figured this would be enough to do a simple test.

turbid rivet
wheat pelican
#

Is wiring rx/tx inverse? I just assumed rx goes to rx and tx goes to tx. First time having to wire UART.

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Thinking about it now, I understand the logic between the two devices.

steady rose
#

the tx/rx thing with serial/uart is a common source of pin confusion. in general RX<->TX and TX<->RX

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for SPI though, it's MOSI to MOSI and MISO to MISO

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those four pins should be enough for that wing

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once tx/rx get swapped

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just to mention - there are other GPS variants that might be better suited for pi usage - just in terms of form factor

wheat pelican
north peak
#

Hi I recently got the new pi touch display 2 and i'm having trouble getting it working. i'm not able to get any kind of display out from the pi. are there any common issues that might cause this. I feel like i installed it correctly but this my first time working with a screen like this

humble marsh
north peak
#

thank you i'll definitely take a look through this forum. the pi was just flashed with the rpi imager tool so maybe it needs to be updated after that?

humble marsh
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which Pi

north peak
#

pi 5

humble marsh
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I don't have one of these displays, so I don't have any experience here.

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is the PI coming up? Do you have other ways to see that it's working (HDMI, etc.?)

north peak
#

activity light is good. i had this working fine with home assistant OS earlier but i wanted to switch to pi os for the screen support. Trying to test ssh now and see if i can reach it

humble marsh
#

I'd just try it plugged into your TV or montitor

north peak
#

no cables for that unfortunately. the new pis only have micro-hdmi 😦

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ssh works!

tulip fjord
#

I created a virtual environment for python. I then installed then adafruit_io module. My code (one of the examples) can't find it,

Traceback (most recent call last):
  File "/home/awoodbridge/att_py/att.py", line 9, in <module>
    from Adafruit_IO import MQTTClient
ModuleNotFoundError: No module named 'Adafruit_IO'

but if I run python3 and import it there, it works fine.

Python 3.11.2 (main, Sep 14 2024, 03:00:30) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
> import Adafruit_IO
> >>> dir(Adafruit_IO)
> ['AdafruitIOError', 'Block', 'Client', 'Dashboard', 'Data', 'Feed', 'Group', 'Layout', 'MQTTClient', 'MQTTError', 'RequestError', 'ThrottlingError', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '__version__', '_version', 'client', 'errors', 'model', 'mqtt_client']
> >>>
> ```
humble marsh
#

in general, don't run with sudo unless you have to

tulip fjord
# humble marsh when you run as sudo, y you lose the venv, because you become a different user

If I run it without sudo I get this error:

Traceback (most recent call last):
  File "/home/awoodbridge/att_py/att.py", line 60, in <module>
    client.connect()
  File "/home/awoodbridge/att_py/lib/python3.11/site-packages/Adafruit_IO/mqtt_client.py", line 150, in connect
    self._client.connect(self._service_host, port=self._service_port,
  File "/home/awoodbridge/att_py/lib/python3.11/site-packages/paho/mqtt/client.py", line 1435, in connect
    return self.reconnect()
           ^^^^^^^^^^^^^^^^
  File "/home/awoodbridge/att_py/lib/python3.11/site-packages/paho/mqtt/client.py", line 1598, in reconnect
    self._sock = self._create_socket()
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/home/awoodbridge/att_py/lib/python3.11/site-packages/paho/mqtt/client.py", line 4609, in _create_socket
    sock = self._create_socket_connection()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/awoodbridge/att_py/lib/python3.11/site-packages/paho/mqtt/client.py", line 4640, in _create_socket_connection
    return socket.create_connection(addr, timeout=self._connect_timeout, source_address=source)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/socket.py", line 851, in create_connection
    raise exceptions[0]
  File "/usr/lib/python3.11/socket.py", line 836, in create_connection
    sock.connect(sa)
TimeoutError: timed out
north peak
humble marsh
tulip fjord
humble marsh
tulip fjord
#

I did double check them. THey are in the program for now

humble marsh
#

Ah, I see you did that, but no one responded.

hearty python
#

Not sure if this is the right place, but am I able to connect my VS code to my raspberry pi zero W? I tried to create a remote ssh but got an error that said the remote host architecture does is not supported. Does that mean the pi doesn't allow this to work?

fickle rose
#

Sounds like vscode doesn’t support armhf

hearty python
#

What exactly is that? I saw some stuff online and it seems like certain versions of the pi work and others don't?

wraith grove
hearty python
#

Dang okay, so it seems like it’ll work with most other just not the Pi Zero W. Not a big deal I was more just curious on why it wasn’t working.

#

Also having problems with VNC into the Pi Zero W as well. It connected but I only had a blank gray screen.

hardy plaza
hearty python
#

The thought process with the Pi Zero W is the ease of connecting through the WiFi and the small form factor. doesn’t seem like there is much of a price difference with the Pi Zero W 2 so might be worth upgrading to get the better processor

hardy plaza
#

The processor is four cores vs one and a lot faster. You do realise the rocket will be out of WiFi range in flight? But you could still do data logging on the Pi that you download once back in WiFi range.

hearty python
#

Yes, should have specified that it’s not needed for live telemetry (that’s a problem we will solve at a later time) but more if we can connect to it through WiFi and run the scripts wirelessly to enable things and then once it goes it’ll record data locally and we can check once it’s ideally back lol.

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So the hope was we could connect the pi to a hot spot that our laptop would be on, start some script, then launch it and check the data when it’s back

hardy plaza
#

Yeah, just ssh into the Pi. You can even set up scripts to do this automatically. Also you could scp (remote copy) files, set up a small python web server on the Pi, etc. Lots of ways…

#

You could also monitor a switch with a GPIO pin that starts and stops you monitor program so you don’t need WiFi to enable things remotely.

hearty python
#

Yeah that’s a decent way to do it too, I like that. Still very much trying to figure out how we want to do all of this.

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For my basic testing I’m just writing stuff on my laptop snd scp it to pi. Also seeing what other options are out there are like you said there are a lot of ways

mint berry
#

So I have 4 Raspberry pi 3's hooked to different TV's displaying information, They are all using the same script to loop vlc thru all the files in a folder, forever, 1 has multiple videos in the folder, 2 have 1 video each, and 1 has just static images. The one with static images is the one I'm having trouble with.

It constantly reports not enough power, and it doesn't continue looping might go thru the list once, twice, 3 times even but eventually I'll walk by and vlc is not playing and has completely closed, have supplied it with a new power supply, full 2amp, changed the micro USB cable, took off the case just in case it was not getting fully connected or overheating, and finally moved the SD card to a different pi 3, all the same.

I'm in the process of rebuilding the setup completely but in the meantime wanted to know if anyone could think of anything I'm missing.

humble marsh
mint berry
humble marsh
#

are the TV's and HDMI cables all the same model?

mint berry
#

yes the tv's are the same, HDMI likely aren't

humble marsh
#

could still be a "bad" HDMI port somehow. Could try another HDMI port on same TV. Also swap the cables. Not sure this is a high-probability possibility

mint berry
#

Yeah thanks for the input, the whole thing has been weird to me made me question myself a lot

wraith grove
#

Also a power supply that offers 5.1V might help, if that isn't already the case.

strong barn
#

I don't think the Pi 3s cared about 5.1V

hardy plaza
strong barn
hardy plaza
# strong barn https://datasheets.raspberrypi.com/rpi3/raspberry-pi-3-b-plus-product-brief.pdf ...

It's not a debate, unless everything on the internet is a debate. What you're referencing is the Product Brief, which is not a datasheet. All models (and all schematics) will list "5V" as Vcc or the power supply voltage, but the official power supplies all provide 5.1V and the recommended voltage from the Raspberry Pi Foundation is 5.1V, for all models. This is intended to limit problems that commonly occur when power supplies are overburdened and brown out under load. The voltage range of the Pi is 4.75V to 5.25V but if it drops to around 4.85V you'll begin to see problems, and the Pi will become unstable at the low end of its range, doing things like resetting.

So if you have a very stable 5.0V power supply that can handle the load without browning out it will work fine, as that's the design voltage for the board. As you may know, the Broadcom chips have internal regulators to drop the input supply down to 3.3 volts for use by CMOS-level peripherals, 1.8V for SDRAM, though many peripherals (like USB and HDMI) require 5.0 volts.

strong barn
#

So it sounds like 5V is the proper voltage, just power supplies can't be trusted

hardy plaza
# strong barn So it sounds like 5V is the proper voltage, just power supplies can't be trusted

It's not so much that they can't be trusted, it's that people typically assume that if a power supply says "5.0V" it will deliver 5.000 volts. And that it will deliver 5.000 volts when under load. All supplies will vary a bit from their stated voltage, the cheaper ones more than the well-engineered ones. But even good quality (e.g., Pololu) regulators will vary because of the tolerances of their parts, typically 5% on the resistors in the voltage divider used as an internal reference voltage, which worst case could be up to 10% off. And people typically don't consider that a 5V 3A supply is fine for a Pi rated 3A, but not for a Pi plus a bunch of additional peripherals.

Under load, when the power supply can't deliver the required current, something has to give, and that will be voltage. So the voltage will begin to drop, or "brown out" when the power supply is insufficient to meet the demand. So yes, quality of the unit is important, but a better guaranteed is making sure you've provided a power supply with enough current to handle your entire system when under load. Some electronics can handle a varied supply better than others, but something like a Pi begins to fail when its supply drops below a certain threshold. It's stated minimum is 4.75V but I've seen failures above that, around 4.8-4.85V depending on the surrounding system as well as environment (e.g., ambient and/or operating temperature).

north peak
#

Looking at getting the m.2 hat for the pi 5 but i need the gpio pins. product photos make it look like all of the pins are sheathed when the hat is installed. Is there something i can get to extend the gpio pins so i can use them normally when that hat is on or add additional hats on top? the pins are already extended by the kit but could i get an even longer extension?

image.png
hardy plaza
# north peak Looking at getting the m.2 hat for the pi 5 but i need the gpio pins. product ph...

There are a few of those peripheral boards that fit under the Pi rather than on top. Another alternative if you want to use that particular HAT is to use extended GPIO headers (with really long pins) that extend through the HAT so you still have access to the GPIO pins. The only issue I've had with that is that even with the long pins they aren't quite as long as necessary (only the tips of the pins end up in the top HAT) so you need to make sure you've screwed the top board down with spaces to make sure you get a good fit, otherwise it will tend to come loose.

#

You can see I'm doing that here. I've got a Pi Zero 2 W on the bottom of that stack (you can see its red and grey SD card) with an extended header that pushes up through the Pimoroni Mini Black HAT Hack3r so that I can attach an Inventor HAT on the very top. The small screws are necessary to hold the Inventor HAT in place because the pin length is a bit short. But it all works fine.

image.jpg
north peak
#

oh ok i see so you're saying you can get away with the shorter pins as long as you have some other support structure

hardy plaza
#

You can get M2.5 spacer kits on AliExpress that come in a large number of lengths, as you'll need to fiddle with lengths sometimes to get the right fit between boards.

#

I found an earlier photo of that same arrangement but using PiconZero boards. It's probably a bit easier to see without the rest of the robot there.

IMG_9278.jpg
#

If you haven't already purchased the HAT it might be easier though to just use one of the alternatives that fit underneath the Pi, if that works for your project.

north peak
#

ok yeah i just looked at the pimeroni nvme base and it looked like it might work with the right screws and spacers

hardy plaza
#

All of those do basically the same thing, just in different physical configurations.

north peak
#

it even has the ribbon cable offset so it doesnt interfere with the other ribbon cables

#

yeah thank you its a little more expensive but that would work much better for me i think

hardy plaza
hardy plaza
north peak
#

Thanks I wonder if that is the same length as the stacking header in the official m.2 kit

#

Cause if these are longer then it might be fine to just swap the header for the longer pins

hardy plaza
#

It sounds like you're on the right track in any case.

humble marsh
#

I used the Pimoroni nvme adapter. Its advantage is that you can use up to a 2280-length SSD board. I had such a leftover drive. Also it covers the components on the bottom of the Pi 5, so you have less need of a case.

brave nebula
#

I am running on rpi4 8gb board.

I CAN run my app without sudo. However, it gives this error WITH sudo.

The first line of my python code is:
#!/home/n/bin/adafruit/bin/python

Consideration: I did NOT have this problem 2 days ago. I did have problems importing numpy into adafruit bin.

sudo ./touched.py --led-no-hardware-pulse 1 --led-brightness 20

self._target(*self._args, **self._kwargs)
File "/home/n/feeduser/./touched.py", line 42, in run
File "/home/n/bin/adafruit/lib/python3.11/site-packages/board.py", line 473, in I2C
File "/home/n/bin/adafruit/lib/python3.11/site-packages/busio.py", line 36, in init
File "/home/n/bin/adafruit/lib/python3.11/site-packages/busio.py", line 148, in init
ModuleNotFoundError: No module named 'adafruit_blinka.microcontroller.generic_linux'
^CTraceback (most recent call last):
File "/home/n/feeduser/./touched.py", line 173, in <module>

humble marsh
humble marsh
brave nebula
#

Yup. Sourcing pushed the user path in front of the system /use/bin/venv path which I guess is broken for Adafruit-Blinka

humble marsh
brave nebula
#

Thanks.. I read both twice. I mostly get it. sudo -E env PATH=$PATH ./touched.py --led-no-hardware-pulse 1 --led-brightness 20 doesn't work. Same error. I'm still looking looking...

brave nebula
#

I discovered that if I sleep before invoking the rgbmatrix module to allow my other task to access an I2C object that it works in user and superuser. If rgbmatrix class is loaded first then the I2C fails. I will keep looking.`class GraphicsTest(SampleBase):
def init(self, *args, **kwargs):
super(GraphicsTest, self).init(*args, **kwargs)

    time.sleep(1)
    self.thread = threading.Thread(target=self.run)
    ##self.thread.daemon = True  # Make the thread a daemon so it doesn't block exit
    self.thread.start()`
humble marsh
strong barn
#

so the new pi 500 is out, and has no NVMe slot? that seems like a major missed opportunity

wraith grove
#

Looks like they considered it really hardstrongly. Might even have enough traced out to make one addable, dunno, early days.

agile depot
#

Is there an up to date Bluetooth Nintendo Switch controller Library compatible with Raspberry Pi OS? Preferably written in Python. I tried NXBT but it appears to be out of date as many buttons don't work. I've been trying to make a script to take a Logitech G920 steering wheel's input and translate it to a switch controller for Mario Kart, while maybe translating the HD rumble into force feedback on the wheel.

#

I also tried using a USB Host feather to get the raw HID data from the wheel, which mostly worked, but I was unable to change the autocentering on the wheel.

restive jungle
#

Dose anyone know if its possible to run the NeoPixel Stick - 8 x 5050 RGB LED with Integrated Drivers on a Raspberry pi pico 2 with a external PSU with python because when I try either some of the Leds light up but not all & they never light up with the right color or they are just white?
Thanks.

strong barn
#

so that's not an SBC, but that's fine. Are you sure it's the RGB model, and not the RGBW model? because both exist.

restive jungle
humble marsh
#

that's why the colors are wrong and it's short

restive jungle
strong barn
#

I ripped that component off of an rpi CM4 by accident. Any idea what it might be?

cm4-dmg.jpg
#

the datasheet calls that area the wireless cutout, I'm inclined to guess it's a resistor on the onboard antenna

strong barn
#

No educated guesses?

#

I'm hoping that if I'm using an external antenna, it won't matter

waxen valve
humble marsh
#

@stuck perch [moving to #help-with-linux-sbcs , since your problem was not CircuitPython]:
What's the kernel version? uname -a output would tell us. I see a number of i2c issues in buster, but they are all old, so hard to tell what change might have caused the problem.

viral quarry
humble marsh
#

I agree there are bugs to fix.

viral quarry
humble marsh
# viral quarry Thanks for suggesting the replacement for the DHT sensors. I believe the main is...

The problem is that there are some Blinka Pi 5 problems right now. It's not an inherent problem with the library. There have been some steps toward fixing that (https://github.com/adafruit/Raspberry-Pi-Installer-Scripts/pull/329), but it doesn't seem to be finished. I'll inquire about this next week.

There are several DHT libraries for RPI (e.g, https://github.com/szazo/DHT11_Python), but I'm not if they work properly on the Pi 5.

viral quarry
# humble marsh The problem is that there are some Blinka Pi 5 problems right now. It's not an i...

I’m not really sure about the Blinka Pi 5 issue, but I have seen a forum post mentioning that dht.exit() doesn’t get executed when stopping the script either with Ctrl + C or the stop button in Thonny. As a result, the DHT device isn’t properly exited and the process on the pin isn’t killed which leads to 'Unable set line 4 to input' in the next execution.

Here’s the relevant code snippet:

Read DHT sensor data (uncomment if using the DHT sensor)

try:
temperature_c = dht.temperature
temperature_f = temperature_c * (9 / 5) + 32
humidity = dht.humidity
except RuntimeError as error:
# Errors happen fairly often, DHT's are hard to read, just keep going
print(error.args[0])
time.sleep(2.0)
continue
except Exception as error:
dht.exit()
raise error
except KeyboardInterrupt:
dht.exit()

#

this issue also occurred when I was using the Pi 4

humble marsh
viral quarry
humble marsh
#

the cleanup needed is one of the reasons we disrecommend DHT sensors. They are just painful to work with. But if you want to work with what you have, I understand.

fast ocean
#

Hello, I have a ILI9341 screen and a Raspberry Pi Zero 2 W that I'm trying to connect it to via SPI. I looked online at some guides but all of them I found are for different driver chips or for displaying the GUI on the screen, whereas I'm trying to output info from a python script onto the screen. Is there an up-to-date guide somewhere?

hardy plaza
steady rose
#

but some of the details can vary depending on what ILI9341 based display you are using

fast ocean
balmy bronze
#

@waxen valve what were you seeing as the max effective data rate from linux->pio on pi5? I seem to be getting about 10MB/s -- I have a PIO program with CLKDIV 1 that is doing a tight out pins, 32 loop and it can toggle a pin at about 1.35MHz according to my scope, which seems to be a hair under 11MB/s. [d6 in this capture]

image.png
#

In this capture, the first few edges are fast because it immediately follows a pio label: jmp x--, label busy delay loop and the FIFO had a few entries in it. so I think PIO is running at my desired frequency, just constantly in a state of underflow because of Linux->PIO transfer speed

image.png
waxen valve
#

i was focusing on things like getting pulseview to capture the gpio header, and helping some other guys capture an adc at 40mhz

#

i need to look into how the "correct" way works, and what its using

solemn finch
waxen valve
#

partially working, there was no proper control of the sample rate or pin selection, and it randomly dropped samples

#

changing the sample rate or pin selection required changing the RP1 source, rebuilding, and re-injecting it into the RP1

#

the stuff RPF did, should greatly simplify things, and make that step trivial

#

but the sample loss, i dont know, i think i was just pushing it too hard

#

capturing 32 pins at 200mhz, lol

#

thats 6.4gbit of data!

#

let me dig up the old src

waxen valve
#

those are the changes i had made to libsigrok

#

it basically just opens /dev/example and reads u32's out, and re-packs data to make sigrok happy

#

and has some hard sample rates defined, that fit the dividers possible with PIO

#

looks

waxen valve
solemn finch
#

Ok, so it isn't mainlined at all

#

32 pins at 200mhz would be amazing

waxen valve
#

correct, it needed some ugly hacks to hijack the RP1's 2nd core

solemn finch
#

👍

waxen valve
#

the thing RPF released, eliminates the need for those hacks

#

but i havent had time to investigate how it works, and redo my stuff around it

#

you can also see here, that i had issues with the edges

#

i'm not sure if thats due to the samples being out of order (2,1,4,3 ...)
or actual ringing

waxen valve
#

(from memory), the DMA runs at 100mhz, and has a 128bit bus

#

so in ideal conditions, it can move 128bits, 100 million times per second, or 12.8gbit of thruput

#

the PIO is on a 32bit bus, so the DMA can only move 32bits per clock, that immediately cripples you to 3.2gbit

#

and 32bits at 200mhz, is 6.4gbit, so thats out

#

also, there is some latency and stalls between transfers, and pcie junk screwing things up

#

and it struggles to get close to that with no-block mode

#

in theory, if you configure the PIO to block on PUSH, then youll never loose a sample, and can probably push it much harder

#

but then you need some hw flow control, where the PIO tells the external hw to transfer each sample

#

which isnt good for a logic analyzer, or adc recordings

#

@solemn finch oh right, and the first 2 DMA channels, have a deeper FIFO

they just go to whatever asks for dma first, like the uart, lol

#

so if you want better performance, you need to init the PIO dma first

solemn finch
#

👍

waxen valve
#

However, apart from a few hackers out there, it has so far lain dormant; it would be great to make this resource available to users for their own projects, but there’s a catch.

#

does that make me a hacker? 😄

#
  1. We need to “link” the uploaded code with what is already present in the firmware — think of it as knitting together squares to make a quilt (or a cardigan for Harry Styles). For that to work, the firmware needs a list of the names and addresses of everything the uploaded code might want to access, something that the current firmware doesn’t have.

linking like that is not required, i entirely skipped that

#
  1. Third-party code running on M3 cores presents a security risk
  2. Once the M3s have been opened up in that way, we can’t take it away, and that’s not a step we’re prepared to take.

its too late, i can already get that kind of access 😛

#

it just doesnt persist across reboots

#

ah, so they added a mailbox, that allows you to send messages to the RP1 firmware

#

and the RP1 firmware then does things on your behalf

# 
clever@raspberrypi:~ $ ls -l /dev/pio*
crw------- 1 root root 511, 0 Dec 27 22:59 /dev/pio0
#

aha, after that reinstall during xmas, i already got the latest everything

#

yes, the driver does have dma support

#

so i dont need to mess with kernel stuff (hopefully)

#

i can just open /dev/pio0, and do everything

#

but i'm also curious how the mailbox works

# 
    ret = rp1_firmware_message(fw, GET_FIRMWARE_VERSION,
                   NULL, 0, &version, sizeof(version));
    if (ret == sizeof(version)) {
        dev_info(dev, "RP1 Firmware version %08x%08x%08x%08x%08x\n",
             version[0], version[1], version[2], version[3], version[4]);
        ret = 0;
# 
root@raspberrypi:~# dmesg | grep RP1
[   41.372336] rp1-firmware rp1_firmware: RP1 Firmware version e4eb725aa7bca7efe2673df3020818c0880a6e30
#

its searching device-tree for raspberrypi,rp1-shmem

# 
                        rp1 {
                                #address-cells = <0x02>;
                                #size-cells = <0x02>;
                                sram@400000 {
                                        #address-cells = <0x01>;
                                        #size-cells = <0x01>;
                                        compatible = "mmio-sram";
                                        phandle = <0x107>;
                                        ranges = <0x00 0xc0 0x40400000 0x10000>;
                                        reg = <0xc0 0x40400000 0x00 0x10000>;

                                        shmem@ff00 {
                                                compatible = "raspberrypi,rp1-shmem";
                                                phandle = <0x60>;
                                                reg = <0xff00 0x100>;
                                        };
                                };
#

bit unclear, on the addressing but its clearly referencing the 64kb sram block

#

i'm guessing the kernel and RP1 firmware just agree on a certain area to write messages, max of 1, and the RP1 is just polling it?

#

and the size is just 0x100 bytes

balmy bronze
waxen valve
#

its not clear yet how it signals the other end

balmy bronze
#

/* Submit the buffer - the callback will kick the semaphore */ I think linux notices when the DMA finishes

waxen valve
#

but how does the RP1 know when a mailbox received a message?

#

i also had trouble where the DMA would deadlock if i messed with PIO the wrong way during a dma operation

#

and only a reboot could unhang it

balmy bronze
balmy bronze
waxen valve
#

so thats for DMA'ing the raw fifo of the pio

#

not any kind of config messages, i think

balmy bronze
#

but it's the overall DMA rate that I was disappointed about, so that was what was on my mind

waxen valve
balmy bronze
waxen valve
#

down in the probe function on 218, you can see how it initializes things

#

228 gets the shared memory from device-tree

#

233 converts it to a struct resource handle

#

249 then maps that into the kernels virtual addr space

#

so now fw->buf points to the shared memory on the RP1

#

@balmy bronze with this hack-tastic code, i was able to access the RP1 sram in the same way, and side-load a binary into an unused area

#

and at line 88, that is an opcode inside a while(true) { ... } from the stock firmware

#

its re-written into a jump!

#

so core0 temporarily gets hijacked, forced to run the launch_core1.bin file

#

and due to RPF adding the mailbox and PIO support, those addresses are now wrong

# 
  if (*REG32b(0x200007c8) == 0xf04f281f) {
    *REG32b(0x200007c8) = 0xbc1af006;
  }

which is exactly why i put that if statement in

balmy bronze
#

with my adafruit boots on I'm pretty sure we'll just be using whatever is the endorsed userspace API but I reeally appreciate the background knowledge here

waxen valve
# 
./eeprom-util -p ~/apps/rpi/rpi-eeprom/firmware-2712/default/pieeprom-2024-11-12.bin
72724 byte stage1
474271 byte compressed file, "bootmain"
27997 byte compressed file, "memsys00.bin"
26742 byte compressed file, "memsys01.bin"
19221 byte compressed file, "memsys02.bin"
14855 byte compressed file, "memsys03.bin"
4106 byte compressed file, "mcb.bin"
2426 byte compressed file, "logo.bin"
8819 byte compressed file, "font.bin"
1602 byte compressed file, "qrcode.bin"
528 byte plain file, "pubkey.bin"
2064 byte plain file, "cacert.der"
1040 byte plain file, "bootconf.sig"
78 byte plain file, "bootconf.txt"
#

when i poke at the latest pi5 firmware, i can see all of these files in the eeprom image

#

the RP1 firmware, is at some random offset within bootmain

waxen valve
#

and after some unpacking and convertion, i get this

potent trellis
#

Can these displays be driven by a raspberry pi?

hardy plaza
ashen kettle
#

Hi all, does anyone know how to get 2x 64x32 to work stacked vertically? By default it seems rpi-rgb-led-matrix considers --led-chain=2 as horizontally stacked 128x32 instead of vertical 64x64.

Does anyone have experience in configuring this? Thank you!

cO5VCOj.jpg
ashen kettle
#

EDIT: I figured it out! I added the parameter --led-pixel-mapper=V-mapper. Woop!

tacit spoke
#

can the pi 500 ram be upgraded (8GB to 16GB) with something like changing, adding, or removing a resister on the pcb?

and

can the pi 500 control neo pixels directly threw a gpio pin say pin 13?

tired marsh
broken shuttle
tacit spoke
#

@broken shuttle thanks for letting me know.

brave nebula
brave nebula
ashen kettle
brave nebula
#

No... 4x1 works great... Ive done 4x2 (64x64) (and all other rgb matrices).

hearty schooner
#

anyone have experience getting a pi zero2w to cooperate with some kind of remote desktop? i've got VNC enabled in raspi-config, but it can't connect, gives a REALLY useful error message

image.png
#

tried xrdc, and i do get a login dialog from the pi side, but it never connects. tried nomachine, it sees the pi, but won't connect.

#

i just want to be able to get to the pi desktop from my windows machine, so i don't have to dig up the connectors to put a keyboard/mouse on the pi...

#

i'm assuming that since none of what i've tried will connect, it's a similar problem across the board, but my limited pi/linux experience is not helping.

lean kiln
hearty schooner
#

pi connect now supports every pi, from the latest blog post

#

i'll try tiger. didn't try that one (yet).

#

FINALLY! something worked. now to try to get Blinka to work. Not anticipating issues, just... it's been an adventure getting this little beast to work.

#

@lean kiln thank you!

lean kiln
#

I always wonder why I still have tigerVNC on my windows PCs and then I remember some Pi / RealVNC shenanigans from the past

hearty schooner
#

i used to use realvnc several years ago, but they started making it more difficult to use for free, so i switched. have been happy with teamviewer, but they're also making life more difficult.

#

was trying to use the memento camera for a photo project, but it has pretty limited resolution in even relatively bright light. so i've got a zero2w and an arducam 12mp camera board. going to try to get equivalent functionality out of the pi. will mean learning all sorts of new stuff.

turbid rivet
hearty schooner
#

ya, that's what it was doing. but that message appeared to be on the pi itself. no clue what it was actually trying to do.

hearty schooner
#

is there any trick to using wifi from a blinka app? i just have a simple file:


print(wifi.radio.ip4address)```

and it tells me there isn't a module named wifi.
humble marsh
hearty schooner
#

ok, thanks.

#

i thought i'd seen sample code that used it, and i was confused. 😉

#

@danh does adafruit.httpserver work?

humble marsh
#

on blinka? I wouldn't necessarily expect it to, but you can use CPython's own http server capabilities, such as SimpleHTTPServer

hearty schooner
#

k, will look there.

#

learning curve going from esp32 to pi is incredibly steep. 🙂

humble marsh
#

networking in CPython is not easy :/

torn trench
#

In general, if you're coming from an esp32 kind of scenario, you might find that on the pi there is less code to write and more configuration to do

#

for instance if I wanted to know the IP address of a network interface on a pi, I would probably read a file in /sys/class/net

hearty schooner
#

current problem is memory allocation for the camera buffers. with an 8mp image stream, i'm getting:

  File "/home/pi/spincam/main.py", line 6, in <module>
    picam2.configure(preview_config)
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1134, in configure
    self.configure_("preview" if camera_config is None else camera_config)
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 1109, in configure_
    self.allocator.allocate(libcamera_config, camera_config.get("use_case"))
  File "/usr/lib/python3/dist-packages/picamera2/allocators/dmaallocator.py", line 43, in allocate
    fd = self.dmaHeap.alloc(f"picamera2-{i}", stream_config.frame_size)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/picamera2/dma_heap.py", line 98, in alloc
    ret = fcntl.ioctl(self.__dmaHeapHandle.get(), DMA_HEAP_IOCTL_ALLOC, alloc)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 12] Cannot allocate memory```
#

wondering what's necessary to give it more memory. it's running on a 4gb pi4, so there should be plenty of ram available.

#

but as i'm pretty much a pi-thon newb, i have no idea where to look.

strong barn
#

maybe check your system logs to see if there's a real OOM condition, but you might also be doing something that hits some other (per user, per process) memory limit

#

what version of what OS are you running?

#

you probably want to check /var/log/messages or journalctl for the logs

hearty schooner
#

latest... 6.6.something. just made the SD card a couple days ago, and have updated everything

strong barn
#

not kernel, major of the distribution

#

raspberry pi os 12/bookworm?

hearty schooner
#

yes. 64 bit.

strong barn
#

run your code, keep a journalctl --follow open in another terminal?

#

there are a bunch of kernel parameters that might influence this behavior if it's not a real OOM condition, but I'd expect to see something logged

hearty schooner
#

i'll try. the pi only has a 480x320 tft for display, and no keyboard at the moment. i guess it keeps looking more and more like i need to plug in a keyboard. at least i switched from the zero2w, where i needed the stupid OTC adapter.

strong barn
#

ssh?

hearty schooner
#

there is no /var/log/messages 😦

strong barn
#

(or other remote access method, VNC is useful if you might need GUI apps

hearty schooner
#

can't run it ssh, it needs the display present

strong barn
#

ssh shouldn't need a display, my pi is most definitely headless

hearty schooner
#

i'll try vnc too. i've got it running in autostart at the moment, but i can change that.

#

running picamera2 with preview needs display 🙂

#

which is where the OOM is

#

it's allocating the stream buffers

strong barn
#

a display shouldn't prevent sshd from running, but that's a secondary issue

hearty schooner
#

it won't get to the allocation step without it

strong barn
#

messages doesn't exist on Pi OS, it's just journalctl

#

but some distros still use messages

hearty schooner
#

ah k

#

i'll go do some reading and see what i can find out.

strong barn
#

good luck

hearty schooner
#

thx 🙂

hearty schooner
#

@strong barn only thing it shows is that the cma failed.

... 
kernel: unicam fe801000.csi: dma alloc of size 10371072 failed```
torn trench
#

could be a ulimit thing

#

operating system limits the amount of ram it will give a process

#

would also be interested in the output of cat /proc/meminfo

hearty schooner
#

i got past the alloc error, added cma=200M to the end of cmdline.txt . rebooting to get default size from meminfo.

#

with added memory, picamera still can't alloc properly. still trying to figure that part out. may have to ask the developer.

#

CmaTotal: 65536 kB
CmaFree: 57260 kB

#

that should be enough for the 10mb alloc that it was trying to do.

torn trench
#

yeah that looks like 64 mb with 50whatever free

#

although that's not 200M so idk what's up with that

hearty schooner
#

that's without the 200m

torn trench
#

oh I see

hearty schooner
#

with it, it shows like 198+ free

torn trench
#

and with the 200m do you get a different error message?

#

what does ulimit -a say?

hearty schooner
#

ya. it doesn't complain about the mem alloc, it's failling in their dmaallocator.py code

#

1sec

# 
core file size              (blocks, -c) 0
data seg size               (kbytes, -d) unlimited
scheduling priority                 (-e) 0
file size                   (blocks, -f) unlimited
pending signals                     (-i) 14892
max locked memory           (kbytes, -l) 485364
max memory size             (kbytes, -m) unlimited
open files                          (-n) 1024
pipe size                (512 bytes, -p) 8
POSIX message queues         (bytes, -q) 819200
real-time priority                  (-r) 0
stack size                  (kbytes, -s) 8192
cpu time                   (seconds, -t) unlimited
max user processes                  (-u) 14892
virtual memory              (kbytes, -v) unlimited
file locks                          (-x) unlimited```
strong barn
#

@hearty schooner I'm not positive about the interaction between python and kernel limits, but that stack size looks like only 8MB, smaller than your 10MB desired

hearty schooner
#

the DMA/CMA is in the heap space, which grows in the opposite direction from the stack

exotic pumice
#

I am using pi5 and i cant run test script because i deleted rpi and i get an error ModuleNotFoundError: No madule named 'RPi'

ruby night
#

In your virtual environment

exotic pumice
#

lgpio.error: 'GPIO busy'

ruby night
#

You will need to provide more information -- What are you doing? -- What code are you running -- what did you do to get in this situation.?

exotic pumice
#

blinka tester

ruby night
#

Did you just install "blinka"

exotic pumice
#

no i use install script

ruby night
#

Yes, but I meant did you install it recently?

exotic pumice
#

it works i seted bad pin

#

thanks

ruby night
#

Great -- Good luck!

exotic pumice
#

how to use ce1 as spi reciever

ruby night
hearty schooner
#

anyone here familiar with that esp32s3 bug in the usb that was responsible for 9.2.3 and refined in 9.2.4? i'm apparently seeing it again. fixed it on one (feather 4+2) last week, but I don't remember what I did. Now it 's a qtpy 4+2 doing the same thing. CP drive comes up OK right after reflash, but after power cycle it doesn't, and terminal shows ESP messages on the wrong serial port (in this case, regularly 24, but espstuff on 23). DanH was very helpful in the past, but isn't here...

humble marsh
hearty schooner
#

I have no boot.py. I'll see if this was with or without a hub.

hearty schooner
#

just realized i'm in the wrong channel for this... ah well.

hearty schooner
#

had to rebuild the os on my pi4. struggling to get things set back up the way they were. right now, it's an import error... i have "from pyzbar.pyzbar import decode", and it says "ModuleNotFoundError: No module named 'pyzbar'". pip tells me "Requirement already satisfied: pyzbar in ./env/lib/python3.11/site-packages (0.1.9)". and the files are there, with what looks like appropriate contents. Any ideas on what it's looking for that's not being satisfied?

tired marsh
#

make sure it's the pip from the same python and vice versa ? not using sudo or anything ?

steady rose
#

is "the way they were" from before the change in allowing sudo pip? sounds like maybe a venv or similar issue

hearty schooner
#

env folder activated. no sudo on pip.

#

before change was the same setup. followed the blinka install guide on both.

steady rose
#

try a which pip and/or which python with the venv active to verify what is being used

hearty schooner
#

yep, both are from the venv "env"

steady rose
#

hmm. what does pip list show?

hearty schooner
#

has pyzbar in it.

#

i don't mind linux when things "just work". but when they don't, I'm really lost. 😐

steady rose
# 
pi$ python
>>> import pyzbar
#

and just doing that says there's no pyzbar?

hearty schooner
#

nope, works there. lemme try something, hold on...

#

was a bash issue. i'd been running it before with "sudo python main.py", as creating a webserver on port 80 isn't allowed otherwise. but i had to recreate the .sh that i was using, and i must have had an activate in there that i'd forgotten about.

#

going to change the port, as it's all internal comm anyway.

steady rose
#

it has info on how to run as root, etc.

hearty schooner
#

yes, haven't re-read most of it since i set this up originally about a month ago.

#

all good now, thanks for the help.

steady rose
#

cool. np. venvs are "fun". xkcd 1987 and stuff 🙂

hearty schooner
#

aye

#

i've been a windows guy since the early 90s at least... have always hated command line stuff. makes trying to get things done in linux more than a challenge.

steady rose
#

yep, def helps to be able to CLI stuff when using linux. so if that's not your thing, then it's not going to be fun.

hearty schooner
#

it's weird, i can remember all sorts of on-screen dialogs & settings... but remembering what to type to edit some arcane config file just doesn't stick in my head.

steady rose
#

oh. editing config files is easy.

#

just use butterflies

hearty schooner
#

lol. please don't get me started reading through xkcd... i have stuff to do the rest of this week. 😉

zenith mason
fickle rose
#

What was the thing that turns a pi 0 into a USB stick? I think the PCB is red and that’s all i remember

hard pike
fickle rose
hard pike
#

Ah that one

#

Unfortunately Amazon listed

faint sparrow
#

on orange pis sbc, how could I tell the board to boot on power on? Online I see that it's not something that you can do within linux itself, but on bios... but sbcs don't quite have a bios....

hard pike
#

On raspberry pi, it’s baked in. Not sure about orange pi

faint sparrow
# hard pike You should be able to do this with a stage 1 boot partition

found my issue in the end, although I don't understand why.
by default the board does boot on power, BUT if the usb/serial is on the sbc, but NOT attached to the pc mainboard
the sbc won't boot by itself, untill, you press to the button on the board.
otherwise, with the usb/serial off the sbc it boots fine, if the usb/serial is attached to he pc board, the sbc does also boot fine

dim siren
#

Has anyone made Adafruit Blinka work with the Khadas VIM3? It doesn't seem able to detect the board, and when I force board selection using
os.environ["BLINKA_FORCEBOARD"] = "KHADAS_VIM3"
it doesn't set the correct chip.

dim siren
#

I figured it out, I needed to modify adafruit blinka source code, so I suspect there might be something wrong with it. I will give the details in a github issue later.

lost quail
#

Does @keen ridge have anything planned for Pi Day? Any exciting announcements, specials or deals?

hearty schooner
#

is there a way for a script (python or bash) to tell if it's running in an ssh session? i'd like to have a python script run from .bashrc, but only if it's actually during startup on the pi itself, not if i'm connecting with ssh. trying to avoid running it twice, in other words.

tired marsh
#

(one way for startup scripts is to use crontab's @reboot shortcut)

torn trench
#

systemd might be even more idiomatic

#

if this is something you want to run when the system starts up

#

but yeah I think cron would be better than .bashrc or .bash_profile

steady rose
hearty schooner
#

thanks all

hearty schooner
#

FWIW, systemd wasn't the right path. It starts the service, but the python is an automated camera module & TFT display... and the preview doesn't happen on the TFT when it's run as a service. Investigating cron...

#

or more accurately, when it starts as a service after reboot. it works fine with 'start' the first time, but not automatically.

tired marsh
#

that might be a matter of starting it at the right point, based on what the script depends on, maybe make it last, or delay it in some way

torn trench
#

It would be interesting to see the logs of the python script when it is not working as expected

#

lots of things could be going wrong 🙂 but I can't think of any inherent reason why systemd shouldn't work for this, or wouldn't work as well as cron

hearty schooner
#

even cron with just @reboot didn't work... i had to add "sleep" to it to make it launch a few seconds after cron starts up. i'll try it again in a bit and see if there's anything that shows up in the log. it still showed up in the process list, so it didn't fail, there just wasn't anything visible, and from all appearances it just booted into a console as it was supposed to.

hearty schooner
torn trench
#

if you can determine what you need to wait for, systemd has After= and Requires= directives that could be useful

hearty schooner
#

k

torn trench
#

and could help reliably start the service as soon as possible without relying on sleeps 🙂 but sometimes sleep gets the job done

#

can get messy quick if you have a lot of them though 😄

hearty schooner
#

for the sake of learning, i'll poke at it some more... although part of me wants to just leave it alone, as it currently works. 🙂

soft whale
#

Hey all, question...
So I'm interested in doing some embedded audio, I've got something running on a raspberry Pi 5 pretty well. But I'd like to see if there are better options for SBC, for my application. I'm looking at the Bela board which is specifically designed for embedded audio. It seems like the benefit is RT operating system, and better analog inputs and outputs. I'm also seeing that the hardware is just a BeagleBone Black. Is it modded in any way? Or is it the exact same hardware? Also it looks like they use Xenomai operating system which ensures RT, but can't I just install that on the BeagleBone Black? I guess what I'm asking, is why is the Bela $200 and the BeagleBone Black is $55?

#

Also, if the RPi 5 has a much faster processor than the BeagleBone Black, and I can use a hat for DAC output, can I just install Xenomai on the Pi and get better performance from a board that costs $70?

turbid rivet
#

As for the RPi5, I’d imagine such a solution would be possible, but may require further investigation to see if the RTOS has a port for RPi5 and can work with certain DACs or ADCs.

soft whale
#

Ah, ok, so if the cape has a bunch of extra features that I don't really need, I can make something a lot cheaper by just getting the beaglebone and getting some cheap components for ADC and DAC.

turbid rivet
#

At volume, yes, I would imagine so.

soft whale
#

I found some documentation on building Xenomai for Pi 4, it's probably similar for Pi 5. But I see what you mean about compatability with DACs, that could get frustrating.

#

also no idea if xenomai has a nice friendly package manager like apt

torn trench
#

(which is also why the raspberry pi is so much more popular than the BBB)

#

I have quite a few nifty pieces of hardware laying in cupboards because the software support and knowledge base just isn't there. Not really the manufacturers' fault, that stuff is so expensive to produce you can't do it at small scale.
but FWIW I don't know anything about this Bela thing, maybe it really is great and has great software support and tons of people use it successfully

opal pagoda
#

can you connect and LLM to the raspberry pi using circuitpython?

stone canopy
violet tendon
#

Hello, I'm looking for a small board (and addons) that has wifi, poe and supports linux. Any recommendations? I've looked at pi zero + poe hat, luckfox and banana pi unfortunately they are a little too big for my project.

strong barn
#

I don't think you're going to find something off the shelf in that form factor, with that feature set

violet tendon
strong barn
violet tendon
#

Whoa atom processor so beefy👍

turbid rivet
mystic light
#

does anyone have experience getting the arducam V3 working with the RPi Zero 2 W? The system sees the camera, but when I try to access the stream after running motion, it says stream is not ready, also seems to have trouble setting the fps

ruby night
mystic light
#

it's supposed to work with libcamerify, I've tried it with and without that and get the same result

ruby night
#

did you try the basic rpicam-hello ?

mystic light
#

libcamera-hello works

ruby night
#

"it's supposed to work with libcamerify" suggests it is an issue with motion not the camera

mystic light
#

rpicam-hello also works

#

yeah, there are two issues I see in the motion logs, one is that it seems to have trouble selecting a palette, and it errors setting the fps

ruby night
#

Good luck! -- I gave up on motion when I migrated to bookworm and libcamera... It's a shame, I have not found a good replacement.

mystic light
#

well that doesn't sound encouraging! 😛 thanks, I'll try a few more things and then likely bail

#

if I find a solution I'll post it

ruby night
#

Sorry to bring bad news.

mystic light
ruby night
ruby night
faint sparrow
#

So I've got one of those usb/hdmi video capture things, it's shown on the usb (I guess? Couldn't find it on lsusb), but I don't quite get, how to see the incoming input/stream it over the internet without actually saving any input

Screenshot_2025-04-06-11-41-44-256_com.termux.jpg
hardy plaza
faint sparrow
hardy plaza
#

And opening up a private network is tricky security wise

#

You’d need to properly harden your Pi and properly open up a port, but I’d not personally risk that, you REALLY don’t want your home network to get hacked

faint sparrow
hardy plaza
#

Saying your data has already been compromised is not an argument for deliberately making it worse. You can rebuild your network and change all your passwords but if you end up giving up your banking login you could lose everything.

#

In any case that’s your choice, I’m just trying to provide some advice

faint sparrow
hardy plaza
# faint sparrow Wouldn't a vpn access just fix it? As I had in my mind to access to it through a...

Yes, that would be a "proper" way of doing it. You just want to be sure you're setting everything up carefully and not leaving any holes. Criminals nowadays are very sophisticated, they know all the hacks, way more than us civilians. They can do identity theft and clean out bank accounts pretty quickly. On a risk-benefit basis, a hobby (to me) is nowhere near worth this kind of risk. But I'm pretty cautious, as I've known both friends and family who've dealt with this kind of thing, and they never even opened up their home network.

Like I said, this is all your choice, I'm just providing some advice.

languid atlas
#

Anyone here familiar with Vizy cam?

#

Or any kind of Linux Open Source camera

strong barn
#

you might also check out streamyard. I know it's popular with a bunch of linux using tech youtubers, but I don't know much about it.

#

https://streamyard.com/

StreamYard
StreamYard

StreamYard is a professional live streaming and recording studio in your browser. Record your content, or stream live to Facebook, YouTube, and other platforms.

torn trench
#

that's to stream an mkv or similar, idk how it would need to be adapted for a capture card

faint sparrow
#

But those kvms, how do they do it? They don't seem to streem over another "central" endpoint, but just have 2 devices, ie kvm and 2nd device

faint sparrow
#

Nvm they host themselves

soft whale
#

Has anybody here got some experience with Jetson Nano or Jetson Xavier NX? I'm trying to find a way to start prototyping with one of these, but I'm not sure what carrier boards are avaialble. I've only found the seeed studio ones so far, and they don't have sd card slots for flashing...

strong barn
soft whale
strong barn
soft whale
#

dat price do

strong barn
#

can you not use the NVMe slot?

soft whale
#

Oh, this one has SD card slot. If there is a slot on the board, I can use it to flash the OS? Because that's all that I'm really worried about. Don't have a Ubuntu computer lying around, and it would be really annoying if I have to do it from some dual boot on my macbook

strong barn
soft whale
# strong barn can you not use the NVMe slot?

Is there a way to flash the OS onto the NVMe card and then just plug it into the board? All the instructions for flashing that I've read are either SD card or USB cable from Ubuntu host computer

strong barn
#

... you're going to have a hard time with jetpack without ubuntu systems around

soft whale
#

ouch, really?

#

I figured that I would just do everything via SSH on the commandline like I do with raspberry pi

strong barn
#

jetpack is pretty janky imo. we were doing stuff offline, and it was a real pain. that said, that was last year, and things keep changing, a new version of jetpack has come out since

#

the higher cost stuff is pretty available, the low cost ones you need to preorder and wait

soft whale
strong barn
#

so there are a lot more, but they tend to be from SIs that specialize in specific verticals

soft whale
#

I basically want to run a torch model on it with some extra python shenanigans

strong barn
#

offline as in not on the internet. jetpack assumes it will be internet connected

soft whale
#

Oh, I'm happy to have it connected to the internet, but my project will definitely be all on the board. It likes an internet connection for updates etc.?

strong barn
#

yes

#

https://www.forecr.io/collections/carrier-boards so for example, you see they make carrier boards for things like railway usage, aerospace, etc

Forecr.io
Carrier Boards

We provide compact, industrial, high valued and ready to deploy carrier boards for all NVIDIA Jetson processor modules. Click for explore and purchase.

soft whale
#

Haha it's all way too intense for my usecase, I really just need the devkit, but I can't find it anywhere

strong barn
#

you have to preorder it. they sell out before shipments even arrive.

soft whale
#

I suppose it's also gonna be a real pain to get audio out of this thing too eh?

#

Will it work with a Raspberry Pi DAC+ hat? or are the pins not the same?

strong barn
#

I think you can get audio out over hdmi

#

depending on the board

#

I have no idea what software support is like for a raspi hat under ubuntu // jetpack. The 40 pin header is supposed to be the same though.

#

you might have an easier time with a USB DAC, but ???

pure sigil
#

ive got the library installed but im confused how to go from here

#

oh nvm i figured it out

tame imp
#

can anyone recommend a solder-less way to connect stemma-qt boards to a RPI 5?

turbid rivet
strong barn
ruby night
faint sparrow
#

I got an usb/wifi dongle for my SBC. So I can connect to it wirelessly even without an active internet connection. Or so it was my aim. Online I see it should be possible to do such thing with Hostpad, but I can't make it work.

I can bring up a wireless, but I can't connect, I think it fails into getting an ip and so it doesn't connect as it desconnect after trying to retrive it. I already specified both dhcp/ip. I'm trying to redo from the start cause I'm lost, anyone has any idea?

faint sparrow
#

I think it's a config issue, as if I manually assign an ip to the client I can connect but not do anything with it.
I guess it's the dnsmasq that ain't working... Yet both servisces (hostapt and dnsmask) are active... Yet the wifi seems to be brigen up only if I call hostatp ./hostatp.conf and not if I call to start the service

strong barn
faint sparrow
strong barn
#

no prob, just wanted to make sure it wasn't some other software I don't know 🙂

#

To start, what hardware (sbc and dongle) are you running, what OS/distro/version?

faint sparrow
strong barn
#

That's not the greatest starting point for compatibility, but it can probably get there... Can you post your hostapd.conf? you may need to redact some info

faint sparrow
#

Sure wait a sec

faint sparrow
strong barn
#

wlx001325adc98d that's the interface name?

#

whoah

faint sparrow
#

I thought at changing it, but one problem at a time, I'm not so great with linux

strong barn
#

what kind of device is connecting to this?

faint sparrow
#

So there's the network that you can connect to only if you auto assign a static ip, but it's useless because it doesn't actually work

strong barn
#

that's expected behavior, you need dhcpd or something like that as well

faint sparrow
strong barn
#

oh you said you're using dnsmasq, my bad

#

can you post your dnsmasq.conf?

#

you need to make sure you've got a dhcp range set in there

faint sparrow
strong barn
faint sparrow
strong barn
#

that's a little unusual to give no ranges for the dhcp-range, but should work. The dhcp-options shouldn't have spaces, but I don't recall if that's an issue

faint sparrow
# strong barn this looks like a pretty reasonable guide: https://finchsec-1672417305892.hashno...

I've followed the guide, but still nothing same problem as before, I can't get an ip in dhcp and so it doesn't connect. Assigning a static ip does connect but the wireless is useless
Here are the logs:
https://pastebin.com/mZMaYQVj

Pastebin
Using interface wlx001325adc98d with hwaddr 00:13:25:ad:c9:8d and s...

Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.

strong barn
faint sparrow
# strong barn to me it looks like something is going wrong with hostapd. Try setting `wpa_pair...

Neither, for a short while without woa_pairwase=CCMP it actually worked somehow, I didn't yet have internet or a DHCP, but I could SSH to the SBC, which is my main aim. But then going into "/etc/network/interfaces" I discovered that the wlan interface was configured to use another network class, which I thought was maybe causing conflict.
Nothing more than wrong, as soon as I change it to the correct class, it stopped working althoughether, setting it back to what it was, didn't solve either. Now I'm back at the situation that was before, ie I can connect to the network with a static ip setted, but I can't do anything with it

strong barn
#

That sounds like a routing issue. I might try to look at the client side to see if you get more helpful error messages. Also, using a computer might give you better debug options than a phone.

faint sparrow
#

Yeee, DHCP issue solved, it was the f*** firewall

faint sparrow
#

I... want to throw this thing out.
Randmly it stopped back working, although it has been days that it worked, without changing config,
After for some reason it keept failing to boot, or staying on the internet with the embedded interfaces

strong barn
#

No offense, but this is one reason why raspberry pi remains popular. Sure, their hardware isn't cutting edge, and the cost is a bit more, but they're just more reliable. I accidentally ripped some components off a CM4 board and it is still working

opaque wagon
#

Using a Raspberry Pi 5 and PiTFT cap touch, experiencing very bad screen tearing. (developing a Kivy app and the screen manager transitions really show how bad the screen tearing is) Anyone have any ideas how to fix it?

strong barn
opaque wagon
rotund kernel
#

Hi, I have a question about my Raspberrypi when i run a script with a st7789 driver display my cpu usage goes to 100% and temperture is high any advice?

hardy plaza
# rotund kernel Hi, I have a question about my Raspberrypi when i run a script with a st7789 dri...

Well, that certainly isn't normal, so I'd suggest something is wrong but it's impossible to diagnose remotely. You didn't mention whether or not the display is actually working or not, which Pi or display model you're running, which version of the OS, if there's any other peripherals attached, or anything about your power supply. All these things make it easier for someone else to help you diagnose the problem.

When you say the temperature is "high" you might mention how high (a Pi can run just fine up to 80°C before it begins to throttle, so "high" temperatures aren't generally a problem). Also, check that your power supply is sufficient to run all your peripherals. In many cases I've seen it's an under-supply problem.

Your best bet initially is to check your system logs (/var/log/syslog) for clues. If you're using a more recent version of the RPi OS it uses journald for logging, so there's no text-based log files. In that case, see: https://www.loggly.com/ultimate-guide/using-journalctl/

rotund kernel
#

I have a raspberry pi 4 B 4g ram, the screen is a 2.0 OTFTSPI GMT020-02 vers. 1.3 with the adafruit ST7789 library and i'm using the original raspberry pi power supply. The temperature goes around 70 degrees and the 2core is using 100% the other cores nothing.

strong barn
#

Is the display working? What is the script doing?

rotund kernel
#

Yes the display is working fine, ist monitoring my IP adress, uptime, temperature, ram usage every 5sec. The display turns off between 22u and 08u

strong barn
#

that sounds like a fairly small job to consume 2 full cores. What kind of code are you running? Have you looked at top or anything to see what's using all that CPU?

rotund kernel
#

its 1 core the core number 2, yes i looked and its my display python script.

strong barn
#

maybe share that script?

rotund kernel
strong barn
#

if you change the sleep time to something higher (30?) does that have an impact on the CPU usage?

rotund kernel
#

that helps nothing :/

#

it's doing this the whole time

tired marsh
rotund kernel
#

I will try this

rotund kernel
tired marsh
rotund kernel
#

yes

#

no 100% usage, now it's like 2%

tired marsh
#

👍

faint sparrow
turbid rivet
faint sparrow
faint sparrow
#

As soon as you talk... It doesn't work yet again, for other uknown issues. Now dnsmasq doesn't recognize an interface that's present

strong barn
#

pi zero format doesn't have anything with 2+ ethernet ports AFAIK. At much higher cost you can get a CM4/5 with router carrier board

turbid rivet
#

Small and cheap are relative, but ignoring that, gigabyte Ethernet is surprisingly hard to find on these SBCs. https://radxa.com/products/cubie/a5e comes to mind, though you may need a hub for additional usb ports…

Cubie A5E

8 Core Tiny AIoT SBC

kind vessel
faint sparrow
faint sparrow
strong barn
#

Can an actual router meet your needs, instead of an SBC? Maybe you can get an old router running openWRT or something

vivid hearth
#

I'm running a Raspberry Pi Zero 2 with Raspberry Pi OS Lite and Blinka. It's serving two USB webcams via Motion and running a few GPIO and IOT scripts. Works fine and usually runs at 30-50% CPU usage and less RAM. Problem is it periodically (1-2 a day) locks up requiring a manual reboot. This never happened when I ran the same load on a RPi4B. I don't know where to start the debugging. The SD card is fairly new so I doubt that's the problem. Any thoughts?

humble marsh
vivid hearth
#

I also thought it was heat until I added the fan a few days ago.

humble marsh
#

when it locks up is the console completely inaccessible? Is there anything in /var/log/syslog that's interesting?

#

trying another SD card would be easy

vivid hearth
hardy plaza
vivid hearth
#

I have noticed that it is often slow to even return keystrokes. I’m wondering if the system is overloaded in a way that *top commands don’t indicate.

#

I wouldn’t expect lock up behavior though. I typically notice it after nothing updates for a few hours.

strong barn
#

You can set up core dumping and try to use sysrq magic keys to force a core dump on freeze

#

then review the core dump for what's going on

#

then if that doesn't work, you almost certainly have a hardware issue

#

If you have a spare pi, try swapping it out first though, because if you've never set up core dumping and magic sysrq keys, it's a little bit of an adventure

vivid hearth
#

Same design, of course.

vivid hearth
#

Switched out with another board and it's still having the same behavior. I need to try a different SD card but I hesitate to reinstall everything so I might just clone it and hope it's not a corrupted file.

vestal cairn
#

What's the simplest/smallest/quickest OS to use for a Pi Zero 2 for PyGame? Just install alpine then python then pygame?

hardy plaza
vestal cairn
#

But that's what I'm currently using, yes

hardy plaza
vestal cairn
#

Decided against PyGame anyway.

hardy plaza
# vestal cairn Thanks! I will stick with it, then.

You'll definitely want raspi-config and other tools, and as a Linux user myself (and before that, Unix, going back to the 1980s) there's absolutely nothing wrong with the Raspberry Pi OS, works great! And Debian compatible, which is my favourite.

broken stump
#

Hello everyone I’m using a raspberry pi 4 and led matrix for a project. I am trying to auto start it once my pi gets power using crontab e but whenever I power it back on the image on the matrix only flashes for about a second. I don’t know how to fix it please help. PS here’s my code

IMG_3493.jpg
hardy plaza
broken stump
#

Omg @hardy plaza that worked if I have a presentation for this that will last around 15 minutes how long should I do a time sleep for?

hardy plaza
# broken stump Omg <@828135237744984114> that worked if I have a presentation for this that wil...

I was really suggesting this just to see what would happen. My suspicion was that you'd gone to the trouble of setting up your LED matrix, you got it going, but then your script exited immediately (it finished what you'd told it to do), shutting off the LED matrix just as soon as it started.

There are a variety of ways to keep a script going. One of them (and only one of them, probably the most basic) is to create an infinite loop. Here's kinda a classic structure for this:

try:

    # put the rest of your script inside here...
    # ...
    matrix.SetImage(image.convert('RGB'))
    
    while True:
        # this will run until you type Ctrl-C
        time.sleep(1)

except KeyboardInterrupt: 
    print('Ctrl-C caught, exiting…')
except Exception as e:
    print('{} raised: {}'.format(type(e), e))
finally:
    print('complete.')
mild raven
hardy plaza
# mild raven Yeah LED Matrixes don't have greyscale only 1-bit buffers and have to be softwar...

One way to keep the display functioning would be to have a Python script that is always running in the background, and periodically reads a filename (a full path) from a file. You could then just edit the file containing the image and when you save it, the next time the image script reads the filename it would update the image.

But yes, as you say, the display needs a continual refresh or it will display nothing.

mild raven
hardy plaza
zealous summit
#

Can someone help me set up my raspberry pi zero 2 w

rotund pivot
#

What are you wanting to do? What have you already done? Where are you stuck?

zealous summit
#

I want to use it to record the video from an analog security camera

#

so I got an rca to usb micro capture card

#

I flashed the sd card for the raspberry but my pc wouldn't recognise my raspberry no matter what I did

#

and it wouldn't let me update the drivers either

#

and now it doesn't recognise the sd either

zealous summit
#

I'm trying to make the ssh connection for the raspberry

#

but the pc doesn't recognise it

#

it comes up as 'unknown device'

steady rose
#

@zealous summit you'll need to figure out how to SSH into the pi:
https://www.raspberrypi.com/documentation/computers/remote-access.html
you can configure network settings in rpi-imager when creating the SD card image:
https://learn.adafruit.com/raspberry-pi-zero-creation/using-rpi-imager
also, having a USB serial cable is a good idea when using a pi headless (no monitor):
https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/overview
simply connecting the pi to the PC via a USB cable will generally not work

zealous summit
steady rose
#

a "data cable" sounds like a standard USB cable
the "serial cable" has a USB-to-serial converter chip in it, it's more than just a USB cable

#

there are USB gadget modes for the Pi that allow the Pi to show up as some kind of USB device, but those are not the standard way of interfacing with the pi, and require more effort to setup

#

and most likely not what you want

zealous summit
#

so I should get a serial cable, do the network stuff on the sd and figure out the ssh for the pi

steady rose
#

you can try SSH now, no serial cable needed

#

but if anything happens on the pi, you won't have any visibility

#

like if it can't connect to your network for some reason

#

then you won't be able to SSH in and figure out why

#

try using rpi-imager and use the option to configure networking, enable ssh, etc.

#

can try pinging it from the PC as a way to test that it's managed to connect to network

#

ping raspberrypi.local

#

initial boot / network connect can take a while with a fresh SD card image. like 10's of seconds to a minute-ish.

#

a fresh image does some stuff and even some reboots, etc. before settling in to normal operation

zealous summit
#

I see, I'll set the os for the sd and I'll tell you if anything comes up

zealous summit
#

@steady rose so I'm trying to set up the sd but my laptop doesn't see it for some reason

#

I might have figured it out

#

yeah figured it out

#

ima start doing the stuff on it

zealous summit
#

Ok I did all the installations and a tutorial told me that I have to edit some files on the sd to make the raspberry pi act as a usb network device

#

but the pc doesn't recognise the raspberry

steady rose
#

what tutorial are you following?

zealous summit
#

chat gpt 🤭

#

I can't understand anything from the official websites

#

so I use it to dumb it down to my level

steady rose
#

are you using rpi-imager to set up the sd card?

zealous summit
#

yes

steady rose
#

what operating system did you pick?

zealous summit
#

this img.xz file

steady rose
#

did you then go through the various configuration options in rpi-imager? like setting it for your network, enabling ssh, etc?

zealous summit
#

No I didn't modify those, but I assume I should have enabled ssh

#

I didn't want to tinker with them since I don't know what they do

#

well most of them

steady rose
#

you'll need to use those options to configure the pi to connect to your network

#

and then ssh in to the pi - which means to connect to it over the network, not via the USB cable

#

you are not going to be able to connect to it using only the USB cable

zealous summit
#

I see, I will look further into it and see if I manage anything

zealous summit
#

I'm having a look at the options rn

#

is the "Configure wireless LAN" thing related to my wifi network?

#

actually I might have figured it out, ima let it start writing the os on the sd now

zealous summit
#

@steady rose alright I flashed the sd and all that, now what?

steady rose
#

put it in the pi, power pi to boot it up, try to ping pi to verify it connected to network

zealous summit
#

it doesn't recognise any name I give it

steady rose
#

if you are unable to find and ping the pi on your network, then you are sort of stuck without some other way of getting into the pi to help troubleshoot

zealous summit
#

that sucks

#

I thought raspberries were easy to work with

kind vessel
#

(that will only work if you configured the wireless LAN, though)

lucid nebula
#

Can someone help me?

#

I'm getting FileNotFoundError: [Errno 2] No such file or directory: 'db/foia-tickets/json' even though the file exists at that location

twin helm
lucid nebula
#

Ye, I was derp and made the realization after a bit of thinking, lmao

zealous summit
kind vessel
zealous summit
zealous summit
#

is this tutorial good for what I'm trying to achieve?

steady rose
#

yes

vestal cairn
#

Linux question: I can turn off the cursor blink by uisng setterm -cursor off and I can clear the screen using clear. Is there a way to target those commands to the shell that's controlling the attached screen? If I attach a keyboard, that works, obviously, but I'd like to be able to do it when SSHed in as well.

wanton current
#

*try

vestal cairn
#

Those get the SSH terminal, not the one attached to the screen, right?

hardy plaza
zealous summit
# steady rose yes

does it matter if I'm connected or not to the internet while flashing the sd? I have the software pre downloaded and so far I've been flashing it offline

#

I have a feeling that was the issue all along

vestal cairn
hardy plaza
steady rose
zealous summit
#

yes

zealous summit
#

it still isn't working

#

flashed it from a different laptop

#

different network

#

it doesn't recognise the name even though it's the same thing

#

doesn't respond to ssh ping

kind vessel
#

Couple ideas/things to look out for:

  • SSID (wifi name) is case sensitive, so "My WiFi" is not the same as "my wifi" for example. (Password too, but that's probably more obvious :))
  • Some devices have problems connecting or staying connected if you use the same SSID for both 2.4GHz and 5GHz devices. (band steering) I recommend using separate SSIDs for each if you're able.
  • mDNS only works in same subnet by default, and is often blocked since it is a broadcast, so pinging hostname isn't reliable in a lot of instances.
  • log into your router/access point and see what clients are connected and if you can locate the IP that way.
zealous summit
#

I'll try these out

zealous summit
steady rose
#

compatible pi models are shown

#

i never use that feature. i have the images already downloaded. i just select the image (CHOOSE OS->Use custom) and the sd card (CHOOSE STORAGE).

image.png
zealous summit
#

yes

zealous summit
#

and followed the same steps

steady rose
#

your os imaging process should be fine then

#

(assuming os image is compatible with pi model being used and was downloaded correctly)

zealous summit
#

should be, but I still can't manage to get the raspberry to respond to my ping after flashing the sd

#

even tried on a whole different device and network

steady rose
#

troubleshooting such things without access to the pi is difficult. it's a black box and you're trying random things and hoping for the best.

#

if you want to continue with the headless setup, highyl recommend getting a serial cable

#

the other option would be to connect a monitor/mouse/keyboard

kind vessel
#

Headless setup really isn't ideal for your first go around, that's generally more for experienced users and advanced use cases. I agree, keyboard/mouse/HDMI would be my recommendation to at least get in and see what's going on after you're imaging. Is it booting up? Erroring out? Wrong wifi credentials? Using the display should make it easier to figure that out 🙂

zealous summit
#

I double check my network name

#

so it's exactly the same

#

and then

#

I type out the password and paste it in

#

so I don't mess up on accident

#

then I do the flashing

#

put the sd in the raspberry

#

let it read or whatever it's doing and after like a minute it makes the usb sound

steady rose
#

what do you mean by "makes the usb sound"? it seems like you are expecting the pi to show up on your pc like a USB device?

#

you should also set hidden and country in the wifi settings as needed for your setup

zealous summit
zealous summit
#

ssh enabeled

#

country/region

#

everything but hidden

steady rose
#

if needed

#

depends on your wifi setup

#

I use thr data port on the pi to supply power to it
^^ don't do that. power normally via the other usb connector.

#

you can ignore the "data" usb connector at this point

#

if your only power is the USB port from the PC, it may not have enough current output to fully power the pi

strong barn
#

And agree with cater, don't power via the data port.

zealous summit
#

like when you connect a keyboard

zealous summit
zealous summit
steady rose
#

unless you've done something significant to alter the hardware, that would not help.

#

the only solution to "headless pi not connecting to network" is to somehow access the pi (serial cable, monitor/mouse/keyboard) and determine why

#

it should be as simple as (1) configure wifi settings in rpi-imager, (2) burn image to sd card, (3) boot pi with sd card

#

(if anyone watching knows a way to headless-ly enable a USB CDC device gadget with a console login, i'd be interested in how)

zealous summit
#

(same)

zealous summit
steady rose
#

no

#

identical to the cable in terms of hardware, just packaged differently

#

cable is generic

#

the PID 3589 is pi specific

zealous summit
steady rose
#

there is circuitry and a specialized chip (the CP2102)

zealous summit
#

dang

steady rose
#

can see it all on the PID 3589 pcb

#

for the PID 954, its all in the chonky plastic bit

#

there's stuff in there. more than just wires.

image.png
zealous summit
#

Yeah I had a feeling

#

what about this thing

#

description :

#

The Prolific PL2303 USB-TTL Serial Converter Cable allows you to use a USB interface as a TTL interface. This cable allows you to connect any TTL interface device, such as a sensor or development board, to your computer and start communicating with each other. The module is compatible with a wide range of devices, as it uses 5V logic and power supply. One end of the cable features a standard USB Type A connector, while the other end has a female pin connector.

Note: This cable does not include a DTR (reset) wire, so it cannot be used as a programming device.

steady rose
#

you want 3v logic for the pi

#

so that specific one would not work

zealous summit
#

dang

#

so it would be underpowered by the raspberry?

#

or would it overpower it

steady rose
#

yah, it would damage the pi

zealous summit
#

dang

#

I'll look on

#

I'm too broke for raspberry stuff

steady rose
#

there are lots of "USB to serial" chips and hardware based on them

#

the PL2303, the CP2102, etc.

#

they all do nominally the same thing: USB-to-TTL serial

#

but the logic level needs to be 3V for usage with a pi

hearty schooner
#

search amazon for "3v usb serial" ... there are lots

zealous summit
#

CH340G USB to TTL Converter Module – USB to UART Serial Interface (3.3V / 5V)
The CH340G USB-TTL Converter Module is a robust USB-UART interface board designed to facilitate serial communication between microcontrollers and personal computers. Leveraging the power of the CH340G chip, this module provides seamless USB connectivity for a wide range of embedded systems, including but not limited to Arduino, ESP8266 and ESP32, that require UART communication.
Feedback

zealous summit
hearty schooner
#

ah

zealous summit
#

they don't deliver components either

steady rose
#

does that one allow setting 3/5 via that jumper?

zealous summit
#

yes

steady rose
#

is there a better image showing the pinout info?

zealous summit
#

Input Voltage: Configurable 3.3V / 5V via jumper

zealous summit
steady rose
#

input voltage comes from USB and is 5V

#

its the voltage output (logic) that needs to be 3V

zealous summit
#

yes

steady rose
#

it seems like maybe that one would work

zealous summit
#

yeah, but I would need a pinout sheet

steady rose
#

the CH340G is yet another usb-to-serial chip

zealous summit
#

it's what I'm looking for right

steady rose
#

it may be printed on the PCB and just not visible in product photo

zealous summit
#

I hope

#

I might just buy it because it costs 2 bucks

hearty schooner
#

it'll be documented somehow

zealous summit
#

probably on the back as he said

#

I could message them about the data sheet

steady rose
#

two pins seem to be for the jumper. so would assume the other 4 are GND, PWR, TX, RX

zealous summit
#

yes

steady rose
#

if you're powering the pi separately, you generally ignore the PWR pin on these

#

and only connect GND, TX, RX

#

most of these are not able to supply enough power to drive a pi

zealous summit
#

yo I found the data sheet online

steady rose
#

and you'd want the PWR pin to be 5V

#

datasheet for that product? or datasheet for the CH340G?

zealous summit
#

nvm it's usb to uart

steady rose
#

uart = serial

zealous summit
#

oh

#

I'm not sure which one it is

steady rose
#

looks like datasheet for just the CH340G

#

even though it does show some example usage circuits

zealous summit
#

so that's why it had like 20 pins

steady rose
#

yep. that's the pinout / pin count for the CH340G itself

zealous summit
#

I think this is the circuit of the module

#

on a different website I found the same product

steady rose
#

looks probable

zealous summit
#

and in the description it said "yo data sheet at this website"

#

and then I found it

#

yippe

#

it has the pinout on the back

steady rose
#

seems like that might work

zealous summit
#

you were right

#

on the pi where do I connect rxd and txd

steady rose
zealous summit
#

man this website was a ton of help

#

so 8 and 10?

steady rose
#

GND to GND
TXD to GPIO 15 (RX)
RXD to GPIO 14 (TX)

#

or 8/10 physical pin number, yah

zealous summit
#

fire

steady rose
#

and then power the pi separately