#help-with-linux-sbcs

1 messages · Page 16 of 1

torn trench
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then you get the benefit of automatic IP address management through DHCP, coupled with the ability to consistently address the pi

wintry steeple
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alright ill try to do that thanks

wintry steeple
#

how do i make raspberry pi zero as a webcam and send the stream to a base pc and do some programming to the stream like qr code/barcode scanning using pyzbar

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i tried directly running the codes from raspberry pi zero but the frame rate is <1 fps

hardy plaza
wintry steeple
wintry steeple
#

i tried to lower down the resolution but only increased to 2fps ish

hardy plaza
#

If your frame rate is limited it's either by software or hardware. If software it can be fixed, if hardware you need to upgrade. The Pi Zero W is a great little computer but it's only got 500MB of memory and one core. The Pi 3 A+ isn't much bigger and has four cores, or go with the Pi 3 B+, more memory, four cores. I'd guess that the frame rate is because the whole computer is running on that one core.

hardy plaza
wintry steeple
hardy plaza
#

I can stream HD over a Python flask web server on a Pi 3 B+ as well as write to a file. At a reasonable frame rate.

wintry steeple
#

my only option is rpi zero as the sbc will be mounted to a drone for my final year

hardy plaza
#

Do you have anything more powerful than a Pi Zero available?

#

I think we typed at the same time.

#

I think basically you've hit the limit of the hardware you're using.

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Though actually I'm not sure. Do you have any Python skills?

wintry steeple
#

not really.. just started doing it

hardy plaza
#

Well, it occurs to me that I generally use a Pi 3 B+ but I can't remember how fast my Pi Zero W was on video. I've got a working streaming video class written in Python, but you'd have to do some programming to alter it to fit your needs. If you want I can provide a link to it.

wintry steeple
#

thank you!!

hardy plaza
#

hold on a minute then

#

This is all part of a robot OS I wrote, so there's lots of stuff like YAML configuration, logging, a message bus, etc, that you don't need. You'll have to strip all that out, but the basic machinery is there. This streams live video out via a flask server, writes to file, post-processes H264 video via ffmpeg, alters the camera color based on a daylight/nighttime sensor, etc, etc. You probably won't want most of that.

The first link is to the project itself. I'd just download the whole zip file, it's probably easier. The video_test.py file does what it says, though I'm not actually sure it still works as a test. The ./lib/video.py is the guts of it.
https://github.com/ifurusato/ros
https://github.com/ifurusato/ros/blob/master/video_test.py
https://github.com/ifurusato/ros/blob/master/lib/video.py

Have fun!

wintry steeple
hardy plaza
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Inside video.py is an OutputSplitter class that is how you get a live stream and a file at the same time. If you only want a live stream or a file (not both) you won't need the OutputSplitter.

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It's a lot to digest I realise, but I won't have time to cut it down myself.

hardy plaza
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Hello, I've got a question. I'd like to connect one of these Adafruit NeoPixel rings to a Raspberry Pi.
https://cdn-shop.adafruit.com/970x728/2862-01.jpg

In the Adafruit documentation: https://learn.adafruit.com/adafruit-neopixel-uberguide/python-circuitpython
they show under Python Computer Wiring a Pi connected directly to the NeoPixel, i.e., Pi 5V to LED 5V; Pi GND to LED GND, and Pi GPIO18 to LED Din. All looks good but under the Best Practices tab it states that "If using a 3.3V microcontroller you must use a logic level shifter such as a 74AHCT125 or 74HCT245." I'm perfectly happy buying a 74AHCT125 (it costs $1.50) but the diagram in the documentation shows the Pi connected directly without the logic level shifter, which seems a bit of a contradiction.

So: if one is connecting a NeoPixel ring to a Raspberry Pi, is the logic level shifter necessary or can I just connect GPIO18 directly to the NeoPixel's Din?

Adafruit Learning System
Adafruit NeoPixel Überguide

Everything you always wanted to know about Adafruit NeoPixels but were afraid to ask

oak frost
#

That's a good point, maybe they made a mistake?

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Maybe you got to use a resistor to get it to 3.7V

gentle briar
#

A resistor won't help. While a 3.3V data signal is out of spec for a NeoPixel powered by 5V, it will often work anyway.

hybrid vortex
gentle briar
#

Maybe I'm missing something: I thought the goal was to send data from the Pi to NeoPixels. You do need a voltage dropper if you're going the other way (from a 5V signal to the Pi)

turbid rivet
oak frost
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Does it not drop the voltage?

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If it doesnt then i got a severe misunderstanding of electcity

gentle briar
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I had thought the issue was raising the voltage: a resistor won't do that

oak frost
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oh, I was thinking of dropping the supply voltage from 5V to around 3.7V

gentle briar
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Dropping the NeoPixel supply voltage (instead of the data signal) could help (by bringing the voltages closer together), but a resistor may not work particularly well, as the voltage drop across the resistor will vary with the current drawn by the NeoPixels.

oak frost
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That's a good point

gentle briar
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That said, xic_man's notion of using a diode to drop the supply voltage makes some sense, as it will impose a more-or-less fixed voltage drop.

oak frost
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It might be a bit much but you can get an iron core and make your own transformer

turbid rivet
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2 diode voltages would put the supply voltage at around 3.6V, but if you have the diodes on hand, I would confirm the brightness on a breadboard before soldering anything.

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The level shifter ic is probably the most affordable compromise-free option if you have the breadboard/perfboard and tools

gentle briar
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Making a transformer-based voltage shifter from scratch seems like a disproportionate amount of effort, but there are commercial buck regulators that would do the job with high efficiency.

faint sparrow
hardy plaza
# hybrid vortex I have used a diode to drop the voltage down a bit to make it closer to the pis ...

I don't want to power the NeoPixels at 3.3v as they're spec'd at 5v and I'd like full brightness.

My understanding is that the 74AHCT125 level shifter is to shift the Pi's 3.3v logic level up to 5v as Din for the NeoPixels. If 3.3v is high enough to hit the 'true' logic threshold on the NeoPixels (as @gentle briar suggestes) a level shifter is not necessary, which seems to be what the diagram in the Adafruit tutorial shows. That is, the NeoPixels are sourced at 5v but the logic input is 3.3v.

On the other hand, the product page suggests using the logic shifter. Hence my question. Since this will be on battery powered robot I'd prefer not using diodes given they're lossy, but I'm guessing on a logic level this wouldn't be that significant, possibly more than the 74AHCT125.

gentle briar
#

NeoPixels specify 0.7 * Vdd as the threshold for reliable logic "true". With a 5V supply, that works out to 3.5V.

#

It's close, but not guaranteed.

#

An ordinary silicon diode drops about 0.6V, so that would make the supply voltage 4.4V and the threshold 3.1V, so a 3.3V signal would drive it reliably.

hardy plaza
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And since this is a logic pin the diode current can be pretty low, correct?

gentle briar
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I was thinking you meant putting the diode in series with the NeoPixel power supply.

hardy plaza
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Ah, no. I want to run them at 5v. That diagram has them hooked to 5v as source power supply.

gentle briar
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Then you can either use 3.3V logic to drive the data lead and hope for the best, or use a level shifter for more reliability.

hardy plaza
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Yeah, the diode isn't going to shift up. I'm just putting in an Adafruit order (for my birthday!) and I'll add the logic shifter as it's only $1.50, maybe try it out without.

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Thanks for your help!

gentle briar
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A diode in the data lead would either block logic true or logic false: either way it wouldn't be good.

hardy plaza
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Yup, now that you say that it makes good sense.

torn trench
hardy plaza
#

29th

torn trench
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Ah I was hoping we had the same one

hardy plaza
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I'm sure you share a birthday with someone famous.

raw solar
#

07/29 is Wil Wheaton's birthday!

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07/16 is Will Ferrell's birthday!

hardy plaza
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Why does the bloody robot stop me from typing O b a m a????

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I tried typing: "I'm three days older than O b a m a." and it keeps deleting my messages. This is frankly one of the truly annoying things about Discord, enough to make me consider spending my time elsewhere. Why do people willingly put up with robotic censorship? Why can't we talk about what we want?

raw solar
#

I think it's to avoid all political talk because that can quickly explode into arguments?

hardy plaza
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So people are willing to live with this?

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Mentioning a US president's name is not political talk.

raw solar
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Doesn't bother me, DMs are always an option

hardy plaza
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It's in the nature of normal human communication.

umbral sable
tired marsh
#

yeah, not the right place to explain why moderation exists on the internet

hardy plaza
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@umbral sable this is kinda my point. It's in the nature of human communication for discussions to veer off topic for a bit. So you guys are entirely comfortable either being censored by a robot or telling people to leave a room if they veer off topic for a minute or so?

tired marsh
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that's the point of having topics

hardy plaza
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Yes, I understand the concept.

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I just find that if you're having a conversation with somebody and either a robot cuts you off or somebody tells you to leave because for 5 messages you aren't talking specifically about the topic listed in the channel that people are being trained to keep their mouths shut. And it's also just rude. It's not normal. Unless this is the new normal and yes, I'll just spend my time and energy elsewhere, where people can act like normal people and have normal conversations.

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And I have been doing this online since 1985 so it's not like DIscord is something new.

restive venture
#

Hello,
I am using a Raspberry Pi 4 with a DHT11 module and used the code given in the example "simple dht test" while changing it to the pin I am using. it says "Unable to set line 18 to input".
import time
import board
import adafruit_dht

Initial the dht device, with data pin connected to:

dhtDevice = adafruit_dht.DHT11(board.D18)

you can pass DHT22 use_pulseio=False if you wouldn't like to use pulseio.

This may be necessary on a Linux single board computer like the Raspberry Pi,

but it will not work in CircuitPython.

dhtDevice = adafruit_dht.DHT22(board.D18, use_pulseio=False)

while True:
try:
# Print the values to the serial port
temperature_c = dhtDevice.temperature
temperature_f = temperature_c * (9 / 5) + 32
humidity = dhtDevice.humidity
print(
"Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(
temperature_f, temperature_c, 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:
    dhtDevice.exit()
    raise error

time.sleep(2.0)
mint pagoda
#

Running Win 11 (WOR) on a Pi400 with 256g SSD. Anyone else?

silent stone
#

On the Pi Camera V2, if I were to disconnect and then reconnect the 3.3v connector (in the 15 wire ribbon), would it start sending data immediately or take a bit to boot? I wanna use a relay to turn on and off the camera in a split second.

chrome wasp
# restive venture Hello, I am using a Raspberry Pi 4 with a DHT11 module and used the code given i...

Make sure your libraries are up to date. That solved the problem in this issue: https://github.com/adafruit/Adafruit_CircuitPython_DHT/issues/63

GitHub
Unable to set line 18 to input · Issue #63 · adafruit/Adafruit_Circ...

Hello, I am using a Raspberry Pi 4 with a DHT11 module and used the code given in the example "simple dht test" while changing it to the pin I am using. The first time running the...

wet panther
#

what is the difference between the Run and the Global_EN pins on the raspberry pi 4?

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when the pi is booted and I short either to ground, it powers off while the pin is shorted, and then restarts bootup when the pin is released

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I know that there is some difference between them and that it might have to do with different power states or bootloader configurations, but I don't know the exact difference

ruby night
wet panther
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Sorry, this doesnt clarity it. The linked post says

"sudo poweroff" will shut down the PMIC at the conclusion of the shutdown sequence. This reduces power consumption to about 3mA but requires pulling GLOBAL_EN low (or cycling input power) to wake the PMIC up.
I think this is saying that Global_EN would restart the pi when it is shutdown, but Run would not. However, I have just tried it myself and doing a 'sudo poweroff' + Run short, and s 'sudo poweroff' + Global_EN short, both turn on the pi

ruby night
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Ah well "Don't believe everything you read" 😉

wet panther
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Ok, I guess I will use Global_EN since someone said that shorting Run is "the wrong way to do a reset"

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My second question: how can I control this pin with a microcontroller? Would I set the pin to be output high by normal, and output low when I want to reset the pi? Would I need a pull up/ pull down resistor? Or would I need to control a transistor to short the pins?

#

Ideally it would be wired so that if the microcontroller loses power, the Global_EN would remain disconnected from ground

gentle briar
#

For questions like that, your best bet is often to just look at the schematic

screenshot_1064.png
wet panther
#

Can I control Global_EN with a 3.3v microcontroller?

gentle briar
hard pike
#

Which sometimes is cheaper and slightly more stable than just a transistor

raw solar
#

So wait, can the RUN or Global_EN pins be used to turn a Pi on and off? Or just on?

gentle briar
#

I don't know what a "load switch" is, in this context.

umbral sable
#

I presume he means like a high-side power-rail load switch with a logic-level EN line of its own.

restive venture
hard pike
gentle briar
#

65 cents vs a 6-cent transistor? I'm not sure what "slightly more stable" means here, either. It's just pulling a line to ground.

hard pike
#

TI compares them pretty cleanly

gentle briar
#

Ah, that's for high side switching: in the case of the RUN or Global_EN pins, they have ordinary resistive pull-ups and just need to be pulled down (low side switching).

hard pike
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They probably have one for low side switching too

gentle briar
#

Possibly, but I suspect it's overkill for a pulldown, when a simple transistor will do fine. The issues in the document (which is aimed at power switching, not signalling) don't apply here, as this is just signalling.

hard pike
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Valid point

#

I just like load switches 😅

raw solar
#

So... I'm still a little confused by this conversation -- can those pins be used to turn a Pi on and off? Or just on when it's shut down?

gentle briar
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I like load switches too (thinking of (mis)using them in an IC tester)

wet panther
#

Would a NPN PN2222 work? Should there be any resistors?

fierce spire
#

Hi, i've been searching for so long now, but I can't find any useful information on how to use hardware pwm with a pythonscript on my rasperry pi zero w to make my servos stop jittering and increase cpu-performance. Does anyone has a good video or something and more important: Does anybody know wheather using hardware pwm instead of software pwm is even the solution for my "Jittering-and-Performance-Problem"?

gentle briar
#

@wet panther Yes, a PN2222 would work fine. You would want a current limiting resistor between the GPIO controlling it and the transistor base: the value isn't terribly critical, 1k or 4.7k should be fine.

#

@fierce spire I'm not a Pi expert, but I don't think they offer hardware PWM (they're not microcontrollers). To get hardware PWM, you can use another board. However, apparently the "servoBlaster" library can provide fairly steady servo control signals by leveraging DMA.

wet panther
#

Thanks!

ripe berry
#

Anybody here have a Pi-top [3]? If so, do you know is it possible to plug into the HDMI on the Pi-hub from an external Raspberry Pi to use the Pi-top [3] monitor for the external Pi? I have an interactive sculpture with an embedded Pi 3b that I need to hook a monitor to so I can do maintenance/coding for it. Would rather not have to buy an external monitor and I already have a Pi-top [3] on the way for a different project. Thanks!

raw solar
#

Pretty sure you could just get an HDMI extension cable, run it from your Pi into the Pi-Top [3] to the HDMI that would go into the Pi inside. I think that HDMI cable goes to a special controller inside the Pi-Top [3]

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Oh, actually, no, the board inside has a regular HDMI, so you CAN just get a long HDMI cable and plug from your Pi into the board

#

here's the broken down device

Pi-Top_Kit_Contents.png
gentle briar
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I'm fond of using the LCDs from discarded laptops as portable monitors. I also have an Atrix dock I use as a portable, self-powered monitor/keyboard/trackpad

reused-laptop-lcd.jpg
raw solar
#

Mmm. Just make sure you don't plug a 12VAC into one that wants 12VDC. It will poof.

thorny pike
#

Hey guys, had some issues with this a while back but haven't had any time to try again until now.
I'm using two matrix panels with the adafruit bonnet on a Pi B+
https://shop.pimoroni.com/products/rgb-led-matrix-panel?variant=19321740999
https://shop.pimoroni.com/products/adafruit-rgb-matrix-bonnet-for-raspberry-pi

I'm running the demo code sudo ./demo -D0 --led-no-hardware-pulse --led-gpio-mapping=adafruit-hat --led-slowdown-gpio=5 --led-cols=64 which works but there are some display issues. There is a pretty large amount of flickering which ruins the effect sadly.
There is also some issues when running my own python code to draw custom things. My guess is it might be a performance issue but I'm not really sure.

#

this is the demo code running

#

this is my own code

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(Apologies for the 3d printer noise in the background)

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My own code is also super dim for some reason compared to the demo

turbid rivet
thorny pike
#

I have a barrel charger 5V 2A power supply connected to the hat

turbid rivet
#

Oooo, that might be why? I know each panel can draw up to 4A, so that might be the cause for your missing lines in the first demo and the dim lights in the second...

thorny pike
#

oh darn that is annoying

#

I was recommended a power supply of that spec on the forums

turbid rivet
#

You probably don't need a full 4A per, but 5V 2A might be a bit short.

#

That's essentially 1A per panel, or about 25% of the panel's maximum.

#

Looking at your application, I would've recommended at least 50%, or a 4A supply, just to have enough room for some play here and there.

thorny pike
#

Ok, that's good to know

turbid rivet
#

RGBs do need all 3 channels on for white, so you might be able to work around it if you modify your code to output a single color instead?

thorny pike
#

ok will try that

turbid rivet
#

Yeah, that'll at least get you comparatively better results. If you're unsure about future applications, you could also invest in an 8A supply and future-proof your design from any functional changes.

thorny pike
#

running it with just one rgb channel doesn't seem to have impacted the brightness or flickers

#

Will probably grab one of these then if it doesn't help can always return it I guess

#

Thanks

#

Will probably go for an 8A one to be safe

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wish I'd kept hold of my old laptop power cables, I'm pretty sure one of them fit this spec

turbid rivet
#

There are plenty of other 5V-charged devices such as mini-screwdrivers and such, but laptops in particular have too large a capacity to be charged over a 5V line.

faint sparrow
#

Dell PSU's for laptops are usually around 19 VDC.

thorny pike
#

ah no worries then

#

hopefully this one does the trick

faint sparrow
#

afaik a laptop PSU is generic (no charger guts at all; it's just a power supply and can be repurposed to any other use).

turbid rivet
#

Yeah, the charging circuitry is typically in the laptop itself. Old laptop "chargers" make great DIY power supplies for small-to-medium projects!

faint sparrow
#

A snap-in, form-fitting laptop battery, on the other hand - I think that has i2c guts inside it. You may or may not be able to ignore the i2c aspect when charging it or even using it (this part is unclear to me).

#

It's amazing how rarely anyone here asks about using this type of battery in a project. ;)

raw solar
#

The only special thing about a laptop power brick is that it may have a chip inside to talk to the laptop to say "hey, I'm an authentic $brand $model power brick"

#

But most of them are 18.5-19.5v, and supply 45, 65, 90, or 120 watts in most cases, so pretty standardized other than connectors

#

And the ID chip thing really only matters for a laptop that expects it -- for example, many Dell laptops will complain about the charger if it's not a real Dell or one with a chip to pretend it's a Dell

twilit quiver
#

idk if this should be here or the raspberry pi section so ill do both

#

hi pls can someone help me with setting up octopi with my 3d printer

thorny pike
#

What problem are you having?

waxen valve
turbid rivet
waxen valve
turbid rivet
waxen valve
#

ah, but it didnt link from the 240x240 page

#

your link also redirects to the homepage

turbid rivet
#

If that's not something you're comfortable working with, all of Adafruit's libraries are open-source, so you can take a crack at their adafruit_rgb_display library

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It should be linked from it, it's the first learn guide on the 240x240 product page.

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Not sure why you're being redirected to the homepage, though. Link works fine on my end?

waxen valve
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worked the 2nd time i clicked it

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must have been a cookie

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yep, thats the identical "confidential information" datasheet i had found earlier

turbid rivet
#

In any case, the information in that "confidential" document is fairly complete, despite its hard-to-read nature. The simpler approach would be to take the bits and pieces you need from the ST7789 module in Adafruit's adafruit_rgb_display library and work what you need from there.

waxen valve
#

i can also read the linux driver some as well

ripe berry
#

Is there an "ideal" GB size for the microSD card in the Pi 3B+? Any different for the 4B?

exotic imp
#

I was given a 3.5inch RPi Display 320x480 HAT (ILI9486) which works with the linux framebuffer driver (fb_ili9486). After having searched around, can CircuitPython/Blinka displayio use the display via this linux driver?

solemn finch
exotic imp
solemn finch
#

I don't know of one unfortunately

#

most of the work for a new display is in the init sequence. it might not be too hard to make a new driver

exotic imp
solemn finch
#

thanks! The community has done a great job with the ui libraries

exotic imp
solemn finch
#

👍 that's a great starrt!

raw solar
# ripe berry Is there an "ideal" GB size for the microSD card in the Pi 3B+? Any different fo...

Probably 8GB for any OS, assuming you're not using any storage for anything. Personally I use 16GB in general, 'cuz it doesn't make a practical difference in price for the cards I get. You don't really need to worry about performance penalties by going bigger -- I have a 3B+ I use for my cat to watch videos, running on a 128GB, and did a benchtest for lulz and it was the same as the 16GB

gentle briar
#

I can't help wondering what kind of videos your cat prefers

raw solar
#

Mostly birds in the forest, sometimes with squirrels

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And there's The Nut Bar, which is a sky-high bar for birds and squirrels, he really likes that one

opaque wagon
raw solar
#

Yeah, bigger cards have more cells to go thru, that's a point. That comes more into play depending on how much writing you're really doing -- a mostly static Pi that's just sending info to the internet or something may never write enough to kill a smaller card

wraith grove
#

I've seen one dead card on a pi that was seemingly idle for a few years

raw solar
#

Need more datapoints for conclusive analysis XD

marble trout
#

i enabled i2c and ran the blinka script in the links above

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i did notice that the blinka script sees my raspberry pi zero w as RASPBERRY_PI_400 detected

torn trench
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I was messing with an i2c sensor on my pi earlier today, and if I sent it a bad command it would stop showing up in i2cdetect

#

it might be worth power cycling, if you haven't already done that

marble trout
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yeah i've rebooted a number of times. i've never successfully seen the device so i've never even been able to send commands to it

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also, i should mention when i run the blinka test script i get all ok!s

torn trench
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I'm not familiar with blinka, but a quick glance suggests that it's simply creating an i2c device (and other peripheral types)

#

since /dev/i2c-1 is showing up on your pi, I wouldn't expect you to have an issue with that

#

(but again, not super familiar with blinka, maybe I'm mistaken)

#

when you rebooted, did you do a full power cycle, in a way that would cause the i2c device to power down and back up?

#

instead of just a software reboot of the pi?

marble trout
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oh, i just did a reboot

#

i'll try full shut down and unplug

zinc jackal
#

Seriously considering getting a Pi 400 for my Twitch stream management...

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As I rarely single purpose any machine...

Does anyone know if it handles encoding two 1080p webcam streams?

wraith grove
#

I'll do a spit-take if it can.
☕

#

there are several cases you can find it difficult to play a single 1080 stream

raw solar
#

Probably better off getting some random old PC to do it

wraith grove
#

I do have a pi 4 restreaming 3 highres streams, it isn't touching the video codec though

thorny pike
#

maybe a bit brighter but still super flickery

thorny pike
ripe berry
#

Have a Pi2B that I now need to get on the wireless network with, but the dongle I use for my other one that works great, but seem to have no brand name on it. What's the best wifi dongle for Raspberry Pi 2B out there now?

thorny pike
#

Do you have any specific requirements? 2.5GHz, 5GHz, etc

ripe berry
#

Nope

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The only thing it says on it is 802.11n. I imagine it would need to be a dongle that doesn't need a lot of power.

thorny pike
#

Tbh I'd just get a cheapo one off of your preferred online store then

raw solar
#

Not all are supported!

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There's a list somewhere of supported chipsets and what brands use those chipsets, but I don't recall where it was

thorny pike
#

Ah fair enough

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I've never run into issues, maybe just been lucky

ripe berry
#

What model do you have?

thorny pike
#

no idea, got it years ago for a couple quid off of amazon

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I mostly use the later models with builtin wifi or just wire them with ethernet

gentle briar
thorny pike
#

I can get the python and c stuff to work okish but the C# just runs with no output

thorny pike
#

And in python, it's a bit flickery

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You can see this horizontal bands going across occasionally

turbid rivet
thorny pike
#

Actually just made that mod lol

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compiled C code looks OK now, but python is still a bit dodge

turbid rivet
#

Did it help?

thorny pike
#

For C not really for python

#

wish I could get the C# to work, as I reckon it'd perform similar to the C#

turbid rivet
#

Oh, booo

thorny pike
#

I think it might be that python is just sloooow

turbid rivet
#

Python probably has too much overhead with the real-time interpreter

thorny pike
#

yeah

turbid rivet
#

Maybe try it with less slowdown haha

thorny pike
#

you have any idea if there's any C# documentation of any kind? I think I'm just not supplying the parameters right

turbid rivet
#

Not that I know of off the top of my head

thorny pike
#

RIP

#

the library has examples but very little about them

turbid rivet
#

But I'm sure someone's done it before...

thorny pike
#

I think I can get the C# to work, but will have to do a bit of reverse engineering

thorny pike
#

It does run now! Sadly not as performant as the c demos though :(

#

This is running one of the demos, it looks super smooth and great

#

This is running one of the C# examples

#

And this is python

#

I would understand python being slower than the c demos, but surely the compiled c# executables aren't that much slower than c? Or does mono slow stuff down a lot?

wraith grove
#

if mono is an interpreter, interpreted vs compiled

vocal lava
#

Is anyone familiar with using a rotary encoders with gpiozero? (https://gpiozero.readthedocs.io/en/stable/api_input.html#rotaryencoder) I really don't understand the max steps and steps. For max steps it says:
`max_steps

The number of discrete steps the rotary encoder takes to move value from 0 to 1 clockwise, or 0 to -1 counter-clockwise. In another sense, this is also the total number of discrete states this input can represent.`. I'm writing some Python that every turn of the knob changes the input on my audio video receiver, which is a list of 12 items.  But I think I'm setting the max states wrong (I have it at 12 now)
gentle briar
#

That seems oddly named to me. What is the result when you turn the knob?

vocal lava
#

Well, that's the challenge, trying to troubleshoot my code vs. what I expect. 🙂 I'm trying to control my Denon receiver over the network using the Pi and 2 rotary encoders. The first encoder changes the volume up and down - that works, but when I coded that a few weeks ago, the max_steps threw me then, so I just set a really high number (60). The second rotary encoder changes the receiver's input as it iterates through its list of inputs. I have wrap set to true: input_rotor = RotaryEncoder(19, 26, wrap=True, max_steps=12) because - if I understand correctly - it should just wrap around, which it isn't doing.

#

I think I'm going to have to write some code just to play with this max_steps thing - figure that out first, then implement my receiver code.

turbid rivet
#

Are you observing your value or your steps in a serial monitor or console?

vocal lava
#

If I understand you correctly - I'm watching it in a terminal. I've added a ton of print statements to try troubleshooting. This is the code I'm playing with, it's not final yet: https://github.com/prcutler/pi-dial/blob/main/input_encoder.py

GitHub
pi-dial/input_encoder.py at main · prcutler/pi-dial

A collection of Python programs and tools to help in building a physical button connected to a Raspberry Pi that controls your Denon audio / visual receiver. - pi-dial/input_encoder.py at main · pr...

#

It's pretty ugly, once I figure this out, I'll clean it up

turbid rivet
#

I can't say I've played with Python in a while, but is there a reason for your function definitions to be nested inside of your while True loop?

vocal lava
#

I don't know, my Python skills are fairly basic. I'm looking for the guide I was following.

#

I can't seem to find it now. I can try moving the function definitions up outside of the True loop. I'm on vacation this week, so I've got the time to play with this. 🙂

thorny pike
vocal lava
#

cool, thanks, will read that

bleak apex
#

Can anyone help me figure out how to use the Twitch API on my Raspberry Pi? I want to set it up so that my Pi notifies me when someone subscribes to my channel. I know there’s a way to subscribe to Twitch events, but I’m not quite sure where to start…

vocal lava
#

@bleak apex I think that's more of a programming project. You would want to write some code in Python (probably) that you can then run on your PC or Pi. The Python code would consume the Twitch API and then tell you whatever you want (that is in the API)

torn trench
#

(but paul is right that there shouldn't be anything different about this than using a PC for the same thing)

#

It looks like at least the webhooks api requires that you be running an api of your own to provide callbacks

#

That said, you could also just poll the number of subscribers, if that would achieve your goal. It would presumably bee substantially simpler.

bleak apex
#

The problem is, I don’t know how to really start using the Twitch API. I understand that I would need to write a script, but I’m not too familiar with how to write post and get requests. Are there any resources that could help me out in some way?

rustic folio
#

It even writes the code for you

bleak apex
#

Whoa this is super cool! Thank you!

torn trench
#

You can do a lot with curl too, to test out APIs

#

(curl is a ubiquitous HTTP(S) client for on linux)

#

(and you can get it for windows too)

#

but postman might have more learning material

rustic folio
#

Glad to help. Postman is invaluable for api development

sweet barn
#

anyone have modbros working using an adafruit tft?

#

my choices in modbros for driver selections are goodtft and waveshare

#

which one of those is the OEM

#

that would help me narrow it down lol

#

those are my driver choices

spice kayak
# bleak apex Can anyone help me figure out how to use the Twitch API on my Raspberry Pi? I wa...

Also may help in your tool belt, twitch-cli from the Twitch Dev team https://github.com/twitchdev/twitch-cli It's nice if you don't want to start straight in their API, and shows working code when you do want to see actual API calls wired up

GitHub
GitHub - twitchdev/twitch-cli: The official Twitch CLI to make deve...

The official Twitch CLI to make developing on Twitch easier. - GitHub - twitchdev/twitch-cli: The official Twitch CLI to make developing on Twitch easier.

bleak apex
#

Wow I had no idea that even existed! I’ll definitely check it out! Thank you!

faint sparrow
steady bolt
#

so i got given a Keybow 2040....already got a Pico RGB so not sure what to do with this one...

any ideas?

& is there way of coding more than 1 layer & easily switching between them without losing key functionality (e.g. through long press of a single key?)

ripe berry
#

I installed the Snaps app version of Inkscape on my Pi, but it would be so nice to have an icon I could click to launch it instead of using the command line. Is there an easy way to do that?

torn trench
ripe berry
#

Found out it works to just type ‘inkscape’ in the terminal. You’d think they’d tell you that on the download/install directions. 🤪

loud geyser
#

Hi, I am trying to connect "Adafruit Mini PiTFT 1.14" to my raspberry pi Zero W with Kali Linux operating system - but I can't get it. Help me please.

https://learn.adafruit.com/adafruit-mini-pitft-135x240-color-tft-add-on-for-raspberry-pi/kernel-module-install

Using this link, I managed to connect and configure the display for the Raspberry operating system. But connecting for Kali linux is unsuccessful. I hope you'll give me a hand! Thanks in advance!

Adafruit Learning System
Adafruit Mini PiTFT - Color TFT Add-ons for Raspberry Pi

The most compact li'l color display for a Raspberry Pi

sleek vessel
loud geyser
loud geyser
sleek vessel
# loud geyser

actually i just found some random blog post explaining how to use the pitft with kali

#

try following that

loud geyser
sleek vessel
#

did you do the python3-spidev part in the blog?

#

since it also says to remove the check for it in the script

#

so if you do that you shouldnt get the issue above (obviously if you dont install python3-spidev as well though it will not work)

shrewd flax
#

Hi everyone, I'm trying to control some 24v analogue leds via pwm on the pi. I originally wrote a program to control them using an Arduino using AnalogueWrite. When working on the pi is modifying the duty cycle equivalent to analoguewrite on the arduino? I'm a bit confused on how to control them using a pi.

loud geyser
# sleek vessel did you do the python3-spidev part in the blog?

dexter starboard the channel member tried it and here is his conclusion:

«Followed the alfredgamulo 2019 instructions. Running "adafruit-pitft.py" ends with a very dissatisfying PITFT Failed message.
All this complicated by the fact that the default python on Kali is 2.7. Have to be sure to run python3 always.
I'm afraid I won't be able to spend any more time on this.»

loud geyser
gloomy ridge
#

I think you should pin raspberry pi discord here for further info

#

It is .gg/jKgMXwXpKv

#

Or any other link

sleek vessel
#

try investigating what its trying to install exactly and install it through kalis package manager?

loud geyser
torn trench
#

(I hang out there, it's a nice place, just want to make sure it's not misunderstood)

raw solar
#

I was wondering if that was a Foundation server

loud geyser
sleek vessel
#

nice!!

uncut lagoon
# loud geyser I won

i have one of those little things, but the 240x240 one. if you want, i can share you a script i wrote to control the os with the buttons

#

it's in python 3.7

raw solar
#

I want that

uncut lagoon
#

give me a second

# 
import keyboard
import gpiozero
from signal import pause

def send_key(key):
        try:
                keyboard.send(key)
                return True
        except Exception:
                return False

def handle_held_button_a():
        button_a.was_held = True

def handle_release_button_a():
        if not button_a.was_held:
                if not backlight.is_lit:
                        backlight.on()

                send_key("up")
        else:
                button_a.was_held = False
                backlight.toggle()

def handle_held_button_b():
        button_b.was_held = True

def handle_release_button_b():
        if not backlight.is_lit:
                backlight.on()

        if not button_b.was_held:
                send_key("down")
        else:
                button_b.was_held = False
                send_key("enter")

gpiozero.Button.was_held = False

button_a = gpiozero.Button(23)
button_b = gpiozero.Button(24)

button_a.when_held = handle_held_button_a
button_a.when_released = handle_release_button_a
button_b.when_held = handle_held_button_b
button_b.when_released = handle_release_button_b

backlight = gpiozero.LED(22, initial_value = 1)

print("PITFT keys registered")

pause()
uncut lagoon
raw solar
#

:D

#

So where do I put that script? XD

uncut lagoon
#

in your home directory

#

preferably, in a folder for all these types of scripts

raw solar
#

Cool. This will come in handy, I want to put a display on an OctoPrint server and be able to get info without going to a computer

uncut lagoon
#

im trying to remember how i did some things, but im having troubles as it was almost a year ago

#

btw, i've put it into ~/.bash_login

#

not the best way, but works

raw solar
#

If it works it works XD

uncut lagoon
#

also i added sudo setfont /usr/share/consolefonts/Lat15-Terminus12x6.psf.gz into it

#

this will GUARANTEE the letters are small

#

i had issues where each reboot the letters would change size

#

sudo python3 ~/.scripts/pi_tinytft_buttons.py & <-- i added this line a bit below, for the script i sent

raw solar
#

Cool :D

uncut lagoon
#

i also created this interface for it, to control with the buttons

unknown.png
#

im connecting to it via tmux

#

weirdly enough, the yellow there shows as orange on the tiny screen

#

just to spice it up, i added this to see what's going on with it, as it is a very weak cpu

unknown.png
#

i really wanna clean it up, as it is 540 lines of pure python madness

raw solar
#

lol

uncut lagoon
#

just a sneak peak at the code

unknown.png
#

if you have any ideas on how to clean it up, i would appreciate

raw solar
#

I haven't gotten into Python enough to optimize, lol

uncut lagoon
#

that was my first time writting python

raw solar
#

Hey, I'd call it a big success!

uncut lagoon
#

and yes, it is a success, but i need to clean it up

raw solar
#

Nice

#

I didn't know you could turn off the backlight

uncut lagoon
#

you can

#

it's gpio pin 22

#

at least on the 240x240

raw solar
#

Ahh

uncut lagoon
raw solar
#

Nice

uncut lagoon
#

have fun with the script, and hope it works for you

raw solar
#

I'll let you know :D

#

Hopefully it'll play nice with OctoPrint

uncut lagoon
#

it emulates a keyboard

#

as long as it can take up/down and enter keypresses, it will work

#

i can control the console with it

#

i do notice that it takes a few seconds to start doing something

raw solar
#

I guess I could have it do more complex things? Like a command?

uncut lagoon
#

yes, you can

#

but for that, i recommend writting something like what i wrote

#

and add tmux, so you can control it better from the pc too

#

and see what's on the screen

raw solar
#

Gonna build the world's tiniest cyberdeck

uncut lagoon
#

will you use a pi zero?

raw solar
#

Of course!

#

Gonna save the Threadripper for the world's biggest cyberdeck :P

uncut lagoon
#

biggest?

raw solar
#

yiss... It shall be enormous

uncut lagoon
#

now im curious

#

btw, if anyone knows how to solve the problem of it taking some seconds before the keys work, i would love to hear it

glossy fox
#

I am having some difficulties getting an adafruit 2.8 touch screen setup. The current status is that it shows a blank white screen. I have not done any calibration. The goal is to use it with pygame to create buttons and menus and to rdp into the device headerless if I need to do anything other than that with it.

I followed the instructions here:

https://learn.adafruit.com/adafruit-pitft-3-dot-5-touch-screen-for-raspberry-pi/easy-install-2

I have Python3 installed (not 3.7) and some gpio libraries. However I get a "Unable to locate package tslib" error.

Adafruit Learning System
Adafruit PiTFT 3.5" Touch Screen for Raspberry Pi

A perfectly-sized little display that plugs into your Pi

#

When googling this I find a bunch of forum talks about it, one being from adafruit directly addressing the issue. However that would indicate that the issue has been patched. Does anyone know how I can install tslib?
In order to create programs to appear on the screen, do I need to have gone through this adafruit install script process, or is this only for when I want to setup a desktop gui for the screen?

#

When I rebooted, and go into a rdp session, i now get a black screen and I can right click to a menu for something called openbox. Does anyone know what this is?

#

Also, someone suggested that I install something called Blinka. Is this the fix for the issue? Thanks

uncut lagoon
#

it's a window manager

#

you probably did something wrong

#

can you grab another card and start over?

glossy fox
#

Card?

#

Surely you can reverse or install whatever changed it?

#

The adafruit script did it.

uncut lagoon
#

well, i had some weird issues before

#

like, the colors inverting on my display

#

i just had to re-do everything

#

besides, if you did something wrong, you will see better what may have been

glossy fox
#

Can someone help me please?

#

I want to create a menu for a tft screen
I have an example on pygame. But I also have now something called CircuitPython.
whats the difference?

opaque wagon
#

(Just saying, you most likely don't have Circuitpython installed on your Pi, you have Blinka which allows you to run Circuitpython code that works on microcontrollers running Circuitpython)

opaque wagon
uncut lagoon
opaque wagon
#

I would just mirror the HDMI output and run like a tkinter application in full screen

wooden terrace
gentle briar
wooden terrace
obsidian wing
#

Hi, This server is probably not the right place to ask for this kind of help, but here it goes I'm using the mcp3xxx library to read from this sensor(https://atlas-scientific.com/gravity-analog-ph-sensor-meter/) this sensor is hooked up to this ph probe(https://atlas-scientific.com/consumer-grade-ph-probe/). I'm reading data, but it's not a decimal ph value. It's a huge integer. Not sure if I did wrong or if I'm missing a step. I followed this(https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008) example to wire up my components. I'm on hardware mode.

turbid rivet
# obsidian wing Hi, *This server is probably not the right place to ask for this kind of help, b...

Um, it is possible that the guide forgot to mention that the read_adc() method returns an unsigned integer, not a raw voltage. The author probably assumed that 1) the reader was somewhat familiar with analogRead() on an arduino or 2) people would notice the example is returning values of 400-500.

In any case, this adc has a 10-bit resolution, so the raw values you receive will be in the range of 0-1023 (or 2^10 - 1) inclusive. To convert this number to a voltage, you divide your value by 1024 and multiply by Vref-Vagnd. The guide has Vref connected to 3.3v and AGND to 0v, so a value of 0 should correspond to 0V and 1023 to about 3.3V. That should result in a voltage you then put into the voltage-to-pH formula as defined by your sensor's datasheet.

obsidian wing
turbid rivet
#

You'll have to convert the value from that integer to a pH value through software.

obsidian wing
turbid rivet
#

I probably explained in a lot more detail than you needed haha

obsidian wing
turbid rivet
#

Tl;Dr pH = (-5.6548 * voltage) +15.509
Voltage = raw * 3.3/1024

obsidian wing
#

Good at coding. Bad at electronics. If that makes sense lol

turbid rivet
#

No it makes perfect sense. You're pretty much there with the hardware selection as far as I can tell.

#

Which means you should be very close to your comfort zone once you get past this haha

obsidian wing
obsidian wing
#

Oh... I think I understand

turbid rivet
#

Formulas to convert you raw integer to a voltage, then the voltage to a pH.

obsidian wing
#

Where did you get that 15.509? Is that a constant value?

turbid rivet
#

Sensor's datasheet. It also says calibration is optional, so I assume that formula should get you pretty close to what you need, at least.

#

I just copied that first line directly from the manufacturer's specifications.

obsidian wing
#

OMG it's right there... on the datasheet. I brushed that part of cause I thought it was info I didn't need.

turbid rivet
#

It happens. Most people don't realize the significance of the information on a datasheet until they actually need it. ;)

obsidian wing
#

Voltage = raw * 3.3/1024. What's in raw?

turbid rivet
#

Raw is what I assuming you're reading from the read_adc() method the guide has you use. It's the "huge integers" in your words.

obsidian wing
#

Oh! Ok gotcha

#

Ok ok. I'll try that. Ah man, you have no idea how grateful I am for your help so far.

turbid rivet
#

No problem, best of luck with your project!

obsidian wing
turbid rivet
obsidian wing
turbid rivet
#

10 bits mean it can return a 10-digit binary number, so the range is 0b0000000000 (0) to 0b1111111111 (1023, or 2^10 - 1).

obsidian wing
obsidian wing
turbid rivet
#

Oh those are much bigger than I expected

#

Looks like two numbers smushed together....

obsidian wing
#

I wonder if I properly setup the mcp3008 library.

#

Oh man I think I got it!

turbid rivet
#

Oh nice! What was it?

obsidian wing
#

The AnalogIn class from mcp3xxx has a volt property and that's actually giving me the right volt value. After using that variable instead of the calculation I'm getting a more real ph

turbid rivet
#

Oh, I also just realized I was looking at the old guide with the older library references heh

#

Yeah, it also seems like the raw value is scaled to 16bits in the new lib

obsidian wing
#

Now I just need to compare against an acidic and a base solution.

turbid rivet
#

Woops

obsidian wing
#

This whole time I was using water and salted water lol

obsidian wing
#

Not to worry that class variable seems to have the correct value

#

@turbid rivet Thank you so much. I hope this works, but I feel this is working as it should. I wish I could send you a cup of coffee or a beer lol.

turbid rivet
#

Lol np. Don't forget to show off when you're done!

obsidian wing
#

I will. 👍 ✨

glossy fox
#

Can someone help me with pygame please?

#

I am getting this error:

# 
  File "/home/pi/pygameLearn/pygame_menu.py", line 1, in <module>
    import pygame
  File "/home/pi/.local/lib/python3.9/site-packages/pygame/__init__.py", line 81, in <module>
    from pygame.base import * # pylint: disable=wildcard-import; lgtm[py/polluting-import]
ImportError: libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
tired marsh
#

you need SDL2, sudo apt-get install libsdl2-dev I believe

#

to get it to work with pygame

#

I think you need the dev package

uncut lagoon
restive beacon
umbral sable
#

This appears to have a 0.5mm connector on one side of the board, and pads for an optional 1.0mm connector on the opposite side, but doesn't actually have the second connector included.

restive beacon
#

Oh I see! So if I'm seeing this right, the boards are the same but flipped (and have male vs female) between those two products

#

So does that mean they won't work with 1.0mm pitch cables then?

umbral sable
#

Not out of the box. If you're handy with a soldering iron you could add a suitable 1.0mm connector.

#

It looks like they have the part number on the silkscreen.

restive beacon
#

Hmm yeah I've been searching for a 1.0mm connector but I can't seem to find any with the right number of pins

umbral sable
restive beacon
#

Great! Yeah I think having the FPC connector already soldered is the easier way to go if I must choose only one side.

#

I should be able to use a cable with fewer pins (like 30-pin) with this right?

umbral sable
#

Yes, but it won't be too mechanically stable, since there's not too much force keeping it from sliding to the side. If you're going to buy a breakout board anyway, it would be best to get the correct number of pins.

restive beacon
#

True. I thought I'd have a difficult time finding other sizes

#

Looks like the link you shared has other pin options, so I'll try another size. My project has a 27-pin connector on the other side (idk why) with 2 pins that are duds. So I'll either go with the 26 or 30 pin size and maybe try a little glue to keep things secure.

umbral sable
#

Unusual size. And yeah, a little hot glue is your friend. 😁

#

You'll definitely want a connector with more pins than the cable, so probably not 26, since that'll be too narrow to fit.

restive beacon
#

Yeah definitely true if I already had a 27-pin cable

umbral sable
#

Oh, gotcha, I misunderstood.

restive beacon
#

Considering the unusual pin count I'm going to have to order a 27-pin cable or a 26-pin cable and then order the next largest connector breakout 😆

#

Thanks for your help! Really appreciate it

umbral sable
#

If you're picking the cable, it would probably be easiest to just match everything at 30 pins if that's what you can easily find.

restive beacon
#

Oh well the other side's connector is already a 27pin soldered to the board

#

I'm just going to do what I can to match to that connector

umbral sable
#

Oh, okay. Misunderstood again, heh heh...

raw solar
#

So I see there's a second I2C bus on the Pi. The one on GPIO2/GPIO3 is called with i2c = busio.I2C(SCL, SDA), how would I call the other one?

#

On GPIO27/GPIO28

turbid rivet
#

Ive also seen people solder similar 1mm pitch cables directly to boards as well, a lot of little displays come with a similar fpc pigtail, but pretinned for an easy pass with a soldering iron.

turbid rivet
raw solar
turbid rivet
#

Oh pins 27 and 28

#

I was like, I can't even find gpio28 XD

raw solar
#

Oop, durr, brain fart

#

But yes, pins 27 and 28

turbid rivet
#

I don't remember how pins are called out on the pi's header

#

But if you just replace scl and sda with the pins you want, you should have a working i2c port for the most part.

#

The only difference hardware wise is the i2c pins have internal pull-ups to 3v3; for any other pins youll need to pull them externally.

raw solar
#

Hmm... Well, those say I2C, so they should have pull-ups, right? Would it be ID_SD and ID_SC for those pins?

turbid rivet
#

27 and 28 are i2c pins, but they're typically used to access eeprom on hats and stuff

#

So yes, they do have pull-ups.

raw solar
#

Ok, cool. I want to use the Pi OLED and a 1x4 NeoKey, so I'll need that other I2C

turbid rivet
#

....do they have the same address?

#

You can connect multiple devices to one i2c bus, as long as their addresses are unique.

#

Neokey is definitely addressable, so provided you can make the electrical connections needed, you can in fact stack them on the same i2c pins @raw solar

raw solar
#

I can't physically connect them to the same pins since the Pi OLED covers them

#

Actually, power is a problem....

#

Ah, wait, no, there's another 3V pin

#

NeoKey works on 3V, right?

turbid rivet
#

Vin takes 3-5V and regulates it to 3v for the board.

raw solar
#

Ok, cool, I should be good then

turbid rivet
#

I'm wondering if it's possible to replace the oled header with a stackable...

#

If you can get a 2x3 stackable header, you could probably desolder the old header and solder it to the through-holes

raw solar
#

Hmm... It has pads on top, regular pin holes, but uses an SMD header...

turbid rivet
#

The smt pads look like they overlap with the holes

raw solar
#

Yeah. I can see all the way thru, so I might be able to just solder to those? But using the other pins is easier

restive beacon
raw solar
#

So... I run OctoPrint to run my 3D printers, and want to add a status display for it. I'm only finding TFT touch screen info -- has anyone ever used a non-touch display with OctoPrint? I was thinking about using one of my Sharp memory displays

raw solar
turbid rivet
turbid rivet
#

You might not even need external pullups, actually. I think the newer Pis might automatically turn on the internal pullups

arctic knoll
#

How can I chain together multiple L293D Motor IC's using i2c connected to a raspberry pi?

raw solar
raw solar
gentle briar
#

@arctic knoll Possibly by using I2C PWM expander chips

glossy fox
#

Has anyone managed to get a Adafruit PiTFT screen to work with Pygame? I am having issues getting output framebuffer 1. I can seem to get outpuit when running from a remote desktop session, but appears on the desktop, regardless that I have it set to framebuffer1.

gentle briar
#

That question isn't really about the Raspberry Pi, you might get more of the right people seeing it in #help-with-circuitpython

vagrant sonnet
#

Hi beginner here. I Got an alphanumeric display hooked up to SCL and SDA (pin 2,3) now I want to connect an Air Quality sensor that uses SCL and SDA too. Is there an alternative pin I can use?

#

Just want to display the 2.5pm value on the display

umbral sable
vagrant sonnet
#

So I need a cable which breaks into 2?

umbral sable
#

Yes, or solder multiple wires to the same pins, or some other means of piggybacking the connection.

#

If you're using a breadboard it should be easy.

vagrant sonnet
#

So I would plug it into the yellow on the breadbord

umbral sable
#

I can't comment on the wire color, but yes, you'd just plug the air quality sensor into the same rows as SCL and SDA use on the display breadboard.

vagrant sonnet
#

ok cool, yellow is SCL and green is my SDA

#

Works 🙂

image0.jpg
steady rose
vagrant sonnet
#

yes

cosmic latch
#

Hi, Ive been slowly getting into coding and electronics over the past year, although i've know about it for years. I have a Circuit Playground Bluefruit and I just ordered a Macropad, and i cannot wait to get it. In the meantime i discovered a video where someone used a Raspberry Pi Zero to convert a USB device to wireless USB (https://youtu.be/I5zA1lU5Tw0). Im sure this will work for the macropad, but whats the best way to add power to allow the Macropad to basically become a wireless macropad? Are there any downsides I may run into due to my lack of experience? Is there a way for the rp2040 and the Pi Zero to talk to each other? I'm also working on designing a 3D printed enclosure to house it all.

YouTube
Novaspirit Tech
Converting Any USB Device to A Wireless USB using Raspberry Pi Zero

In this video I will be showing you how you can turn your raspberry pi zero to a wireless USB hub, essentially giving you the ability to share any USB device over wifi!

○○○ LINKS ○○○
PIA VPN ► https://privateinternetaccess.com/offer/nova_mw0n7k9dq

Raspberry Pi Zero W ► https://amzn.to/3zKhRjX

Raspberry Pi Hub ► https://amzn.to/3f2JHjc

Virtua...

▶ Play video
old violet
#

Hi, i'm coding python into a Rasp zero w, and I need an extra microsd card in my project. I tried to use this lib https://pypi.org/project/adafruit-circuitpython-sd/ with the adrafruit blinka, but I'm having some problems at the part of "storage", I don't have the lib in my project to import because I already have my OS from rasp. Does anyone know how can I get the directories from this external sdcard?

PyPI
adafruit-circuitpython-sd

CircuitPython library for SD cards.

thorny pike
#

Hey guys, I'm not super familiar with electronics to this degree - I'm using an Adafruit RGB Matrix Bonnet for Raspberry Pi, and I wondered if/how I can use some spare pins to check if a switch is pressed or not?

tired marsh
#

yup, they are broken out on the bonnet under those names if I get this right, soldering a header on top of those seems like a good move, or put stacking headers on the pi and look at the pi pinout to find the pins

thorny pike
#

So say I stuck a wire with a switch between SDA and SCL, how would I check if they were connected?

tired marsh
#

you would rather wire it between SDA and ground, then you would set SDA (or GPIO2) to pull up, and detect the button press when the value is low

thorny pike
#

ok, that makes sense

#

What do you mean by pull up?

tired marsh
#

an input pin has to have a pull value, usually internal, that sets it's default value, if you connect to ground you want the default to be high, so you set the internal pull to up

#

otherwise the value will be "floating", taking random values when the button is not pressed

thorny pike
# 
    fd = open("/sys/class/gpio/gpio2/direction", O_WRONLY);
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/gpio2/direction");
        exit(1);
    }

    if (write(fd, "out", 3) != 3) {
        perror("Error writing to /sys/class/gpio/gpio2/direction");
        exit(1);
    }

    close(fd);

    fd = open("/sys/class/gpio/gpio2/value", O_WRONLY);
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/gpio2/value");
        exit(1);
    }
    else if (fd == 3) {
        // switch open
    }
    else() {
        // switch closed
    }
#

so something like this?

tired marsh
#

I don't know that API sorry

#

note that the SDA and SCL pins have external pull ups on the raspberry pi board, so you probably don't need to set an internal one

thorny pike
#

ah ok

#

do you know any C APIs?

tired marsh
#

sorry, I usually stick to python for what I do

thorny pike
#

Fair enough

#

I usually do tbf, but I needed the extra performance of C for this project

thorny pike
#

Having real trouble getting the C library to work

#

/home/pi/Documents/LED2/src/main.c:59: undefined reference to `gpioInitialise' but afaik it's installed and I am referencing the header file 🤔

thorny pike
#

Gonna rephrase the question - I need help determining the C code I would need to check if a simple switch is open or closed. I can use any of these pins: SCL, SDA, RX, TX, #25, MOSI, MISO, SCLK, CE0, CE1, #19. I have tried using wiringPi but cannot get my C program to compile with it - it can't find the binaries. I'm using a Makefile to build the program, so it's possible I'm not using the parameters properly? Anyone got any pointers?

EDIT: Ended up using the gpio command line utility with popen instead, which works great.

umbral iris
#

Hi, I am trying to use those ublox gps module directly with my pi by connecting to pi's uart pins. but i can't get the port in the putty or in arduino serial window. what's the problem might be?

steady rose
#

did you disable the console attached to it by default?

turbid rivet
#

Is UART defined as a COM port on RPi? I thought it was device dev/serial0 or dev/ttyAMA0 or something...

steady rose
#

^^ yah, that's where it shows up as

#

but by default, what's on it is a login console (used for headless debugging)

#

^^ that's how to do it via rasp-config

#

can also edit /boot/cmdline.txt

umbral iris
#

ohh, i will try that out tomorrow, thanks @steady rose

steady rose
#

oh, you'd also want to edit /boot/config.txt

#

probably best to just do it via raspi-config as shown above

velvet frigate
worn oak
#

oops didnt mean to post yet

#

I get no audio from assistant but all tests work

#

speaker-test makes sound, arecord|aplay makes echoes

#

I had it working once, then apt update messed it up. started again from scratch

#

using voice bonnet

worn oak
#

reran the seeed install and raspi-config set default to voicebonnet

#

now gv_bottontotalk.py just hangs after printing "playing response"

#

whot am I missing?

worn oak
#

googlesamples-assistant-pushtotalk works

#

python3 permissions?

worn oak
#

I take it back, googlesamples-assistant-pushtotalk worked once, now it hangs

#

I have rebooted

restive beacon
#

Hey I have a quick question about the Pico Lipo (https://shop.pimoroni.com/products/pimoroni-pico-lipo). Any idea if the battery charging features would work the same way via 5V to the VBUS pin as with the USB-C port? I am wondering because I would like to use the USB port in host mode instead.

#

For reference, the datasheet for the regular RPi Pico (https://datasheets.raspberrypi.org/pico/pico-datasheet.pdf) says on page 20: "If you are using Raspberry Pi Pico in USB Host mode (e.g. using one of the TinyUSB host examples) then you must power Pico by providing 5V to the VBUS pin." That tells me I'm on the right track, but doesn't shed any light on the battery charger which is specific to the Pico Lipo.

umbral iris
#

@steady rose it worked, thanks.
@velvet frigate this guide is what i was looking for. i can point it for others who needs it, thanks.

idle dove
#

Hi, I am trying to use the PI PICO with the Adafruit Capacitive Soil Sensor. I am using micropython and trying to read the I2C data from the sensor. Can anyone help me with how to read the data from the bits? To my knowledge there are no micropython tutorials/drivers with this sensor and Pi PICO.

#

Here is the code and output from it. I have the I2C in GPIO pins 4&5

umbral sable
#

That looks like -1, or 0xFFFFFFFF, so you might not be getting good data from the I2C bus to start with.

idle dove
#

How do I check the data?

umbral sable
#

I'd just print out the value of ss_wetness after you read it.

idle dove
#

You are correct I am gettting 0xFFFFFF when printing

#

How do I fix that to get good data?

umbral sable
#

So I'm suspicious of your readfrom() commands since it looks like you are requesting 31 bytes. Did you mean to use readfrom_mem() to read the register address 0x1F instead?

idle dove
#

Ah. If I readfrom_mem what does the 3rd arg denote? The buffer?

umbral sable
#

The parameters are the I2C address, the register memory address on the device, and the number of bytes to read.

idle dove
#

So looking at the driver for circuit python get_temp(). I see _STATUS_BASE is 0x00 and _STATUS_TEMP is 0x04. Would this mean my args would be readfrom_mem(54, 0x00, 0x04)? https://github.com/adafruit/Adafruit_CircuitPython_seesaw/blob/4ab8a0fc00795121d81f7e609bb7a03973725f10/adafruit_seesaw/seesaw.py#L462

GitHub
Adafruit_CircuitPython_seesaw/seesaw.py at 4ab8a0fc00795121d81f7e60...

seesaw helper IC driver for circuitPython. Contribute to adafruit/Adafruit_CircuitPython_seesaw development by creating an account on GitHub.

umbral sable
#

Sorry, I'm not familiar with the Seesaw protocols. That seems a bit more complex than a normal I2C register read. Is there a reason you're not using the Seesaw library yourself?

idle dove
#

There isnt a seesaw library for micropython I dont believe

umbral sable
#

Oh, some incompatibility between CircuitPython and stock MicroPython?

idle dove
#

I thought they were different launguages so circuit python libraries dont work with micropython

umbral sable
#

My understanding is that CircuitPython was based on MicroPython, but I don't know if they've since diverged. You might get more info in one of the CP-specific channels.

idle dove
#

Ah. Yeah i dont believe this library works with micropython due to imports such as board

idle dove
#

@umbral sable Do you know how to write/read to an SD module in micropython on the pico? This is the error I am currently getting

image0.png
umbral sable
fierce spire
#

Quick question:
Can I check, if something is connected to a pi GPIO pin without actually activating the output?
So, for example, can I check wheather an LED is connected properly without lighting it up/activating the GPIO output?
I've heard, that it is somehow possible but I can't find any clear information how.
Thanks for helping me out!

gentle briar
#

You could try configuring it as an input and activating the pull-up (or down, depending on how your LED is connected) resistor and seeing if it reads as logic high or low. Whether this would work depends somewhat on the LED forward voltage, how/where the current limiting resistor is connected, and the thresholds of your I/O pin. There may be other approaches, that's just the one that occurred to me.

#

Another possible approach is to hook it to two I/O pins and configure one as an input (to sense the LED) and one as an output, and just pulse the output very briefly so the LED is lit, but not long enough to emit much light.

velvet frigate
#

I cant fit a fan on a pi 4 due to hats. It's getting throttled under load. I'm going to add some heatsinks, will that be enough or is there something else I can do?

turbid rivet
#

A heatsink will help, but if you're putting a HAT over it, you'll still want some sort of fan on the side to keep airflow between the heatsink and the HAT directly above.

velvet frigate
stable aurora
#

Hey everyone, I am trying to use adafruit io to read a toggle switch from my raspberry pi (using python). I have all the appropriate libraries installed but for some reason I am getting a request error 404.

Here is my code:

from Adafruit_IO import Client
from time import sleep

username = "myusername"
key = "mykeu"

aio = Client(username, key)

while True:
    data = aio.receive('Skylight')
    print(data.value)

    sleep(3)

Any ideas? I thought this would be simple, but ran in to this issue pretty early on. The only thing I can think of is there is a different key that I am not aware of.

snow stream
#

Does anyone have any good getting-started resources on writing Linux drivers for custom hardware? I would like to design a board with an I2S MEMS microphone and connect it to a Pi. What all is involved in going from hardware-hookup -> device shows up in Pulseaudio?

gentle briar
snow stream
#

Thanks! I have done hello world kernel modules and things like that before, but I'm lost when making the jump to doing specific things like I2S, or any other kind of peripheral interface like that. But maybe these resources have something that could help me with that. Thanks!

final stump
#

Need help with Bedclock cycling on - off

celest abyss
#

Would someone be able to help me with the 1.3 Color TFT bonnet hat? I cannot seem to get it to work. Running through the basic commands under learn does not display anything on the screen. When attempting the troubleshooting and downgrading the firmware, it turns on the backlight, but the screen is not displaying properly.

glossy fox
#

I am trying to hook up a touchscreen and programming HAT to my zero W at the same time.

#

I can run the python script that comes with the hat, and it blinks the status led.

#

however avrdude cannot see a .conf file that is exactly where it says it is.

#

actually it has issue with linuxspi device. and this is what is listed in dev

#

/dev/spidev0.1 /dev/spidev1.0 /dev/spidev1.1 /dev/spidev1.2

#

I have the screen on SPI0, but im not sure how to use SPI1 to interface with the programmer

cobalt raven
#

I am trying to run some services on an old RPi2. What parameters should I monitor to conclude that the RPI system is under load and that I should shut down a few services to ease some load.

opaque wagon
#

CPU and memory usage definitely

#

Maybe disk usage as well

#

Also CPU temperature can be important

spark kayak
#

I don't know it it's the proper channel. The question is: How can i use ili9341 screen with x2046 touch controller? I found that fbtft is quite good, but its modules are not working on latest Kernel. Do you recommend any driver? I want it to work with octoscreen software, so the touch ability is useful. Model of my hw is rpi 3B

cobalt raven
#

thanks @opaque wagon

# 
import board
import digitalio

yellowled_pin = 18
redled_pin = 17
greenled_pin = 27
blueled_pin = 26

# Activity LED
yellowled = digitalio.DigitalInOut(board.D18)

# Status LED
redled = digitalio.DigitalInOut(board.D17)
greenled = digitalio.DigitalInOut(board.D27)
blueled = digitalio.DigitalInOut(board.D26)

# How do i print these pinouts?


def dirty_pinout_printer():
        print(f"ACTIVITY LED PIN: {yellowled_pin}")
        print(f"RED LED PIN: {redled_pin}")
        print(f"GREEN LED PIN: {greenled_pin}")
        print(f"BLUE LED PIN: {blueled_pin}")
#

This is my led_pinouts.py file

#

I want to print the pinout directly from the redled, greenled, blueled variables. Instead of hardcoding the values another variables *led_pin

#

Is there a way to print the pin values from *led variables?

#

Please @ me when you respond to the above.

opaque wagon
#

Well, you could use a dictionary instead: (untested)

led_pins = {
    "red": 17,
    "yellow": 18,
    "green": 27,
    "blue": 26
}


def pinout_printer():
    for key, value in led_pins.items():
        print(f"{key.upper()} LED PIN: {value}")
#

@cobalt raven

cobalt raven
#

@opaque wagon No i meant how can i print whatever pin the redled, greenled variable are set to.

For example and know that im writing pseudocode here....

print(redled.pin)

opaque wagon
#

oh the value???

cobalt raven
#

The end idea is that the user can set and read the pins the led are set to without opening the code.

#

Yes the value.

#

I haven't found anything yet. Still looking.

opaque wagon
#

well, i haven't used blinka in quite a while so idk if this will work:

led_pins = {
    "red": digitalio.DigitalInOut(board.D17),
    "yellow": digitalio.DigitalInOut(board.D18),
    "green": digitalio.DigitalInOut(board.D27),
    "blue": digitalio.DigitalInOut(board.D26)
}


def pinout_printer():
    for key, value in led_pins.items():
        print(f"{key.upper()} LED : {'ON' if value.value else 'OFF'}")
cobalt raven
#

@opaque wagon what do you use for gpio/electronics stuff on RPi?

opaque wagon
#

RPi.GPIO i think unless i'm using adafruit libraries, then blinka

slim linden
#

How would I go about using adafruit blinka with python 2? Jython does not support python 3.

spark kayak
#

Anyone knows why module fbtft_device does not exist?

unknown.png
#

lsmod returns this

unknown.png
steady rose
#

@slim linden blinka only supports python 3

sand pumice
#

Hello! What's a common/recommended set of frontend, backend, storage options for Raspberry Pi based projects?

Goals:

  1. Must use React, whether needed or not, want to use/abuse this opportunity to learn React.
  2. Phone/Home automated NeoPixel lights, Pi Cam, Mic and Speakers powered by Raspberry Pi.
  3. Not using MQTT node red or similar publish/subscribe options. Reason is to keep the Raspberry pi project relatively self contained, low dependencies.

Current Design:
My Phone / Home Automation --> Pi hosting React on Node.js FrontEnd --> Flask Python 'backend' that uses bunch of AdaFruit NeoPixel/HW libraries. For storage, files and/or SqlLite, maybe with JSON extension to store/query relational table and/or JSON blob data.

Cheers!

uncut lagoon
#

im trying to use https://github.com/atanunq/viu to display an image on the console of my mini pitft 1.3" 240x240, but it can't display the half-block character: ▄
i tried changing font, using the uni1, uni2, uni3 and latin15 fonts, but it still can't render this, showing a "missing character" character on the display. is there anything i can do?

unknown.png
#

this is the best i could do to show the display

IMG_20210811_082300_2.jpg
edgy veldt
#

Hi

#

Has anyone worked with u-blox GPS modules?

deft ocean
edgy veldt
#

nice

#

have u tried using U-CENTER?

#

Do you know how to map the (or how they map) the hardware pins to the pin numbers present on the UBX-MON-HW message?

deft ocean
#

So far I've only connected to it with a RP2040 Pico. I've avoided U-Center so far because I'm trying to do everything with NMEA type commands but I'm beginning to think that I will have to resort to UBX commands. I've not tried the UBX-MON-HW yet.

#

I'm slowly working through this datasheet:https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_UBX-13003221.pdf

edgy veldt
#

UBX parsing is pretty ez

#

anf if you wanna change some configurations... so basic as baud rate you will need to use it

drowsy steppe
#

Hello! I'm building a (small) Raspberry Pi cluster. I have one Raspberry Pi 3b, and a Pi 4. I'm planning on getting more Pi 4's to make it bigger. Currently I'm powering the Pi 4 with a USB-C 45 W (so 9 amps) charger, so it won't overvolt, as it has a fan and I'm going to overclock it soon. The Pi 3 just has a normal (2.4 A) USB charger. This works, but as I get more Pi's having a laptop charger brick/wall wart for each one takes up a lot of space and is messy, so I'm hoping to have one power supply for them all. I'm considering:
(a) A POE+ network switch and some POE+ hats for the Pi's
(b) A big (like 5 ports) 60+ watt USB charging station, and plug the Pi's into that

How do you recommend I power a small Pi cluster? Thanks!

uncut lagoon
#

he also provides some information about the 2 versions of the poe hat, and shows what he uses for his cluster

#

he also shows how to do it and everything you may need, with examples of how to control kubernetes and all

faint sparrow
#

I have a Includes "40-Pin T-Shaped (Assembled) Breakout Board and Ribbon Cable
Includes GPIO Quick Reference Card" that cames with my raspberry 2.0, any idea what it is for exactly ?

raw solar
#

The T-shaped breakout board is so you can connect your Pi to a breadboard to mess with stuff, the reference card is for the GPIO pinout so you know what pins are what and don't blow anything up

faint sparrow
#

2nd newbie question, I still can only interact with digital gpio right ?

turbid rivet
#

Interact? Depends on how much of what you're doing you know?

faint sparrow
#

so this would be fine to interact with an IC2 humidity/temp chip but not read voltage and guess the temperature myself

turbid rivet
#

If you're using an I2C chip, you're acquiring data via serial data, not by an analog voltage

#

I don't even think the Pi is capable of reading analog voltages via GPIO....

raw solar
#

I don't think it is

steady rose
#

it'd let you interact with all of the pi's pins on a breaboard, in whatever way you want. good pi pin reference here:
https://pinout.xyz/#

#

yes, you can do I2C. also SPI.

#

pi's don't have ADCs, so can't read voltage

#

but lots of I2C and/or SPI ADC breakout options

restive venture
#

i am getting connection failed error when try to connect with thingspeak cloud

#

Importing modules

import spidev # To communicate with SPI devices
from numpy import interp # To scale values
from time import sleep # To add delay

import thingspeak
channel_id = 1999361 # PUT CHANNEL ID HERE
write_key = 'XRL09Q0VZJFL' # PUT YOUR WRITE KEY HERE
read_key = 'DJUV8KF8ATB6' # PUT YOUR READ KEY HERE

Start SPI connection

spi = spidev.SpiDev() # Created an object
spi.open(0,0)

Read MCP3008 data

def analogInput(port):
spi.max_speed_hz = 1350000
adc = spi.xfer2([1,(8+port)<<4,0])
data = ((adc[1]&3) << 8) + adc[2]
return data

import time
from w1thermsensor import W1ThermSensor
sensor = W1ThermSensor()

def measure(channel):
try:
soil_moisture = analogInput(0) # Reading from CH0
soil_moisture = interp(output, [0, 1023], [100, 0])
soil_moisture = int(output)
temperature_of_water = sensor.get_temperature()
# write
response = channel.update({'field1': temperature_of_water, 'field2': soil_moisture})

    # read
     read = channel.get({})
     print("Read:", read)

except:
     print("connection failed")

if name == "main":
channel = thingspeak.Channel(id=channel_id, api_key=write_key)
while True:
measure(channel)
# free account has an api limit of 15sec
time.sleep(15)

faint sparrow
#

Have a RasPi 4 used in a rover along with multiple other sensors. When I attach the BNO085 sensor using the UART-RVC wiring found in the docs (https://learn.adafruit.com/assets/94966), the WiFi drops out shortly after powering on the system. I suspect it is pulling too much power since that wiring requires two 3v connections. On a tester RasPi 4, the following code works reliably. Already confirmed that WiFi is stable on the rover RasPi when the BNO085 is not attached. Any ideas on what else I can try? I'm using UART-RVC due to other constraints on how my rover is set up. It should work, aside from this new issue with WiFi power.

import serial uart = serial.Serial("/dev/serial0", 115200) from adafruit_bno08x_rvc import BNO08x_RVC rvc = BNO08x_RVC(uart) while True: try: yaw, pitch, roll, x_accel, y_accel, z_accel = rvc.heading print("Yaw: %2.2f Pitch: %2.2f Roll: %2.2f Degrees" % (yaw, pitch, roll)) print("Acceleration X: %2.2f Y: %2.2f Z: %2.2f m/s^2" % (x_accel, y_accel, z_accel)) except Exception as e: print(e) pass

faint sparrow
#

My pi 2.0 has been plugged on the TV for 3 years doing nothing. All those ethereum/bitcoins lost 😦

#

Was looking everywhere for ti last week and found it connected to the TV because there was a suspect mouse near the TV

faint sparrow
# faint sparrow Have a RasPi 4 used in a rover along with multiple other sensors. When I attach...

It seems like something else in my system is using the same serial0. I moved the P0 to be powered from the BNO085 3vo pin instead of the RasPi4 3v pin and that seemed to make it a little more stable. But after running this code and seeing the sensor data, it started to report an exception, and then I lost my SSH connection to the RasPi4 (via WiFi). So, I'll look for what else could be using serial0.

steady rose
#

by default, pi creates a login shell on serial0

#

can disable in raspi-config or by editing /boot/cmdline.txt

faint sparrow
# faint sparrow It seems like something else in my system is using the same serial0. I moved th...

So, for anyone here, the issue was fixed by properly disabling the Serial Console! I'm now watching a never ending stream of sensor data coming from the BNO085. 🥳
Info from the pinout docs here (https://pinout.xyz/pinout/pin10_gpio15)

UART can be used to talk to Serial GPS modules or sensors such as the PM5003, but you must make sure you disable the Serial Console in raspi-config first.
As well as the documented steps for doing there here (https://www.raspberrypi.org/documentation/computers/configuration.html#disabling-the-linux-serial-console).

GPIO 15 (UART Receive) at Raspberry Pi GPIO Pinout

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

Raspberry Pi Documentation - Configuration

The official documentation for Raspberry Pi computers and microcontrollers

faint sparrow
lucid crest
#

I was wondering if I could get some help with a Raspberry Pi 4B running Ubuntu. Specifically, I'm using the serial port and I2C bus that are part of the RasPi (As opposed to an external USB converter like FTDI). I found that the /dev/i2c-1 and /dev/ttyS0 are set to inaccessible permissions at boot. Is there an easy way to set these to usable permissions with each bootup? Or am I stuck running chmod each time?

#

I received a suggestion of using udev rules, but I can't get my head around how to setup the matching (because these are not USB devices with lots of ATTRS), nor can I figure out the syntax for running the change mode portion. (I thought I saw somewhere that it's just MODE=0666 or something like that, but I want to confirm.)

faint sparrow
#

@lucid crest permissions and memberships in a group

# 
 $ groups
nomaku dialout cdrom floppy audio dip video plugdev netdev bluetooth
#

user (login) named nomaku has membership in group dialout and so may use the serial port.

# 
 $ ls -la /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Aug 13 14:19 /dev/ttyS0
lucid crest
#

the user is already a member of the tty group, but because it's not both RW, it's still not working 😦

faint sparrow
#

I've only used the TTL serial in 9front.org which is way different.

#

The old MS-DOS COM1 thru COM4 mapped to /dev/ttyS0 through /dev/ttyS3 iirc.

#

Those were real USART chip based ports.

#

There used to be a Linux specific website that talked a little about i2c on a Linux system's motherboard.

lucid crest
#

Ok, thanks for the info.

faint sparrow
bitter loom
#

Hello,
I am trying to get two of these displays (https://www.waveshare.com/wiki/3.5inch_DPI_LCD) running from my GPIO on a pi
Can I just use a Y splitter to have both displays showing the same output? Touch doesn't matter and I won't use it, so does that mean I don't need an i2c multiplexer?

faint sparrow
#

That's not typically done that way.

bitter loom
#

so how would I go about doing it

#

I just need the displays to output the same thing

faint sparrow
#

I don't know that you can do that as a beginner asking questions. Sounds advanced.

#

I would put it on some kind of i2c repeater and fan out from there, accepting double overhead on the microcontroller (or in this case, the RPi).

bitter loom
#

the wiki shows that the only i2c pins are for the touch

#

not needing the touch means that surely I have no use for i2c, and could just Y split the pins that matter... right?

faint sparrow
#

There's no fictional Y splitter for this kind of thing.

bitter loom
#

sure, I don't intend to buy one, I can just solder my own GPIO Y splitter

faint sparrow
#

I would find instructions you trust.

#

Then if it doesn't work out, you'll know why.

bitter loom
#

there's no instructions for this, it would seem

#

I've really tried to find something but nothing has come up

faint sparrow
#

Well you can very likely use 7400 series IC's to get something closer.

bitter loom
#

(probably because a duplicated display off GPIO isn't very useful for most people)

faint sparrow
#

Find a buffer in the 7400 series IC's that explicitly states you can connect inputs together, directly or maybe through diode OR circuits (I don't know the details; it's not an approach I'd probably resort to).

#

Also the SeeSaw module from Adafruit is worth a quick glance.

bitter loom
#

i see

faint sparrow
#

SPI can probably listen passively.

#

So it might be a candidate for a fan-out circuit.

#

As long as you're not using MISO but only MOSI.

#

I would have to guess you'd want a proper buffer circuit for each.

#

If you had enough GPIO pins you could bitbang the output(s) in parallel, too.

#

If you do try to do a hardwired Y I'd think schottky diodes inline might be helpful.

#

(and maybe 5k to 10k ohm resistor too).

sick quartz
#

I’d like to use a pi zero w’s gpio emulate a SPACE BAR/ENTER keyboard press, within a browser running on the pi zero. (Ex: Start/Stop a YouTube video playing in the browser running on the pi zero) does Blinka have that capability? gpiozero?

#

I’m trying to avoid an additional keyboard/microcontroller.

raw solar
#

Are there any 5-7" displays for the Pi that are higher resolution than 800x480> Ideally like 1080p or better?

turbid rivet
# bitter loom Hello, I am trying to get two of these displays (https://www.waveshare.com/wiki/...

I believe with DPI it is possible to split the display output. It’s not ideal, but I’m theory it should work okay. @faint sparrow is probably thinking an I2C or SPI display with conflicting feedback, but a dpi touchless display should have little to no conflict nor signal deformation in parallel. Touch will be funky, so you’ll have to find a way to disconnect the touch on at least one of the two displays, and the only other concern I would have is current draw. Make sure your pins are capable of driving the two displays, the backlight can draw a good amount of current…

mint pagoda
#

https://www.amazon.com/Haiway-Portable-1024x600-Earphone-Raspberry/dp/B08LDT4KTH/ref=sr_1_1_sspa?dchild=1&gclid=CjwKCAjw9uKIBhA8EiwAYPUS3MgdmfBZrpRNzvU4Ms-IbmMMsi43DfdqXF9MVNBsljBQqrfmvdKtQxoCrxcQAvD_BwE&hvadid=260047787226&hvdev=t&hvlocphy=9010623&hvnetw=g&hvqmt=e&hvrand=11644725329328125522&hvtargid=kwd-307354803784&hydadcr=18471_9830605&keywords=7+inch+1080p+monitor&qid=1629079759&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExSUlUNDFGRDgwQTQ5JmVuY3J5cHRlZElkPUEwODIwOTA3MkhISk4zT0Q3SkNUSCZlbmNyeXB0ZWRBZElkPUEwOTAxNzk4SFU3TjdMWDhSV0FWJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Haiway 7 inch Small HDMI Monitor, 1024x600 Resolution Small 1080P P...

Haiway 7 inch Small HDMI Monitor, 1024x600 Resolution Small 1080P Portable IPS Monitor with Remote Control with Built-in Dual Speakers HDMI VGA Input for Gaming CCTV Raspberry Pi PC (7 inch IPS)

raw solar
#

Is... Is it 600p or 1080p? It can't be both

turbid rivet
#

It’s definitely not 1080p

raw solar
#

I just don't understand why I can have a 1440p 6" screen on my phone but I can't get a 1080p 7" display DX

bitter loom
turbid rivet
#

Worth a shot, at least. I don’t see this possibly breaking anything, at the very least.

bitter loom
#

Yeah I'll give it go lol

#

bought the displays already anyway

turbid rivet
#

You might want to break out the power from a separate supply, just in case.

bitter loom
#

Yeah

#

Do you think it's possible to remove the digitizer entirely? or is that gonna be glued hard

turbid rivet
#

Digitizer? Not sure what you’re referring to…

umbral sable
#

The touch-sensitive layer of the panel, most likely.

bitter loom
muted jewel
#

Hey everyone, I'm having trouble with a project. When I test the parts separately they're all good. When I connect them they don't work. I think it might have something to do with the power? Not sure

Here's the parts list:

  • Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302

  • Mini Metal Speaker w/ Wires - 8 ohm 0.5W

  • PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C

  • Lithium Ion Polymer Battery - 3.7v 500mAh

  • Raspberry Pi 3 - Model B

  • Waveshare 3.5inch Resistive Touch Display (C) for Raspberry Pi, 480×320

  • Various buttons and wires

hardy plaza
#

Yeah, the power. You're going to need to pay attention to the power requirements, basically sum up all the device's currents and make sure your power supply has that plus a bit of buffer. You're not likely to get anything working using only a 1 amp supply.

muted jewel
#

Oh OK. Thank you for the fast reply. So I need more amps to pump through the device to be more than all the components added together?

hardy plaza
#

If the accumulated current of all your devices is say, 2.5 amps, you're going to need at least a 3 amp supply. More is better, and higher quality power supply is better, especially since this is an audio amplifier. Maybe check out Pololu as they have a ton of options.

muted jewel
#

Awesome. Thanks for the help 🙂

hardy plaza
#

Sure, happy to help.

gentle briar
#

Note, you'll also need a LiPo that can supply the input current: a step-up supply like that will need to draw more current from the cell than it provides at its output (conservation of energy)

turbid rivet
bitter loom
#

rip :( why are all the screens being sold touchscreens, it's annoying af that there's so few non touch options

turbid rivet
#

It's harder for companies to stock non-touch, since they can usually accept touch in non-touch applications, but not the other way around.

#

I can't think of an application where touch gets in the way of things enough to cause issues where non-touch wouldn't...

bitter loom
#

i'd expect non touch stuff to be cheaper and there's the added weight of touchscreens

#

but anyway, that's just me ranting

turbid rivet
#

Touchscreens, at least modern cap-touch, weigh so little that the weight difference should be negligible on most of them. Non-touch is cheaper, but they're rarely stocked. If you order directly from a manufacturer, they wait for an order confirmation to glue the screen to glass so they can confirm the need for touch before finalizing the display. Suppliers, unfortunately, don't have that luxury, so they just stock whatever is forecasted to sell more reliably. With touchscreens becoming more and more common, it just happened that way. The price difference is probably negligible in a one-off, anyways, so as long as you have the non-touch options available at scale, most people are happy.

raw solar
#

Touch can end up being cheaper because they can just make more touch than non-touch, and the non-touch gets more expensive due to lower volume of sales. Plus like Hem said, you can generally use a touch in a non-touch application [just don't connect/enable the touch part]

bitter loom
#

yeah it's understandable

#

just annoying lol

#

it'll probably be fine though

turbid rivet
#

I know applications where they just tape back or even cut off the touch pigtails in prototyping....

#

Made me so sad when they cut it for a one-off.

faint sparrow
#

anyone know of a good pi zero case that can hold the camera and has space for the soldered pins

#

the stock case is too small the pins dont allow you to close it

ripe berry
bitter loom
#

@turbid rivet my stupid solution actually worked lol

UIbVU-TJbabZ_6alcXoVtdwcAkCPEqMY8A6bjo4EDlu13G5IMD6MXAJmM-Jb3JCYtZZbiHBPztqm4CrhCNfAg8uk5eyL7sV5J46L.png
#

the cables are a MESS and a huge pain to plug in but it works!

turbid rivet
#

I figured it would, but didn’t know anyone that would actually wire it out LOL

#

That’s great!

turbid rivet
#

If you don’t have any i2c devices on the same bus, you could probably get away with disabling the touch in software, otherwise you can clip the pins or (carefully) make a disconnect in one of the ribbon cables.

bitter loom
#

👀

#

this looks good

#

would be infinitely more convenient too rather than painstakingly plugging each one in!

#

ty, I will buy one and some ribbon cables

turbid rivet
#

The interesting part in all of this is if you just remove the requirement of the exact touch position, you can make it to detect touch events on any screen via the interrupt pin

#

And if you want to distinguish which screen, you simply move the interrupt pin on one screen to a different pin on the 2x20 header

bitter loom
#

that's good to know at least

#

I'm unlikely to use touch in any way, since the displays will be awkward to touch

turbid rivet
#

Your screens can become a giant toggle switch if you program it to be one haha

bitter loom
#

i may be able to use that though 🤔

#

maybe as like a sleep function or something

young fjord
#

I'm looking for advice about an easy kit/setup to make a raspberry pi web cam.

turbid rivet
young fjord
#

Thanks that looks perfect

feral folio
#

webcam as in IP camera, or webcam as in USB camera?

#

for USB camera, I found https://github.com/showmewebcam/showmewebcam to be much faster and easier than https://github.com/geerlingguy/pi-webcam

GitHub
GitHub - showmewebcam/showmewebcam: Raspberry Pi + High Quality Cam...

Raspberry Pi + High Quality Camera = High-quality USB Webcam! - GitHub - showmewebcam/showmewebcam: Raspberry Pi + High Quality Camera = High-quality USB Webcam!

GitHub
GitHub - geerlingguy/pi-webcam: Automation to configure a Raspberry...

Automation to configure a Raspberry Pi as a USB OTG webcam - GitHub - geerlingguy/pi-webcam: Automation to configure a Raspberry Pi as a USB OTG webcam

young fjord
#

I was thinking about as an IP camera

proud kayak
#

MotionEye or MotionEyeOS would be a good pick then

#

I have a setup with MotionEyeOS running myself with a couple of external IP cameras but you can also use one connected with a ribbon cable or through USB

#

Ah just realized that @turbid rivet already linked to a guide using MotionEye

#

+1 to MotionEye then 😅

raw solar
#

Has anyone used OctoPrint with something like a Mini PiTFT? I was thinking about putting the ones with buttons on my servers so I can see a quick status without having a full monitor, and have quick action buttons to cancel/pause prints or shut down/restart the system

hard pike
raw solar
hardy plaza
#

That's one of my favourite little displays, have been putting them on my robots and running htop, or using a radio keyboard and typing on the console. It's like a 4 pt font but still quite bright and readable. There was a period where you had to pin your kernel to a version from last December but that bug has been fixed in the newer kernels so now after it does its (rather extensive) kernel modifications it just runs.

raw solar
#

htop presents well on there?!

hardy plaza
#

vera small

raw solar
#

I didn't think you'd be able to have it be useful

hardy plaza
#

actually, I run htop on the 320x240, regular top on the tiny one

turbid rivet
#

I was going to use https://plugins.octoprint.org/plugins/touchui/ but even that's a bit big for that tiny tft

OctoPrint Plugin Repository
TouchUI

This plugin will transform the OctoPrint layout into a Mobile/TFT friendly layout. With larger buttons and a responsive layout down to the smallest resolution possible. It will mimic pointer events as touch, so you can hook up those touchscreens. It also supports a virtual keyboard.

raw solar
#

I kinda just want like, IP/WiFi status, reboot/shutdown

turbid rivet
#

https://plugins.octoprint.org/plugins/display_panel/

OctoPrint Plugin Repository
OctoPrint Micro Panel

This plugin implements the software control side of an OctoPrint Control Panel for Octopi. The hardware half is a series of 4 buttons, an OLED screen and a 3D printed case that mounts on the printer next to the Raspnerry Pi so it can be plugged in to the header pins.

raw solar
#

Yeah, that's more like it, and I can add shutdown/restart buttons

#

Danke :D

hardy plaza
#

That's htop on the 320x240.

raw solar
#

Yeah, not sure how useful 240x135 will be, lol

hardy plaza
#

I can fire it up and take a photo if you like.

raw solar
#

Sure, that'll be faster than me setting it up on mine XD

hardy plaza
#

Different robot, just a minute...

raw solar
hardy plaza
#

yeah yeah yeah

raw solar
#

lol

hardy plaza
#

Professional camera on tripod, 2 sec timer, unmount SD card and put back in camera, take photo, turn off camera and put SD card back into workstation, open file in Gimp, resize and save.

raw solar
#

No graphs :O

hardy plaza
#

I've never configured top for that on that robot. But you can get an idea of the size. Actually, you could configure htop to remove features you don't want and have graphs.

#

I do like seeing the CPU usage graphs, yes.

raw solar
#

I basically just want the graphs XD

hardy plaza
#

Then I'd just go with htop and set your configuration accordingly. I think the process list is entirely disable-able.

#

I've got an 8 core NanoPi Fire3, which is just slightly bigger than a Pi Zero, and it's cool to see the cores fire up when compiling Python on it.

raw solar
#

Actually, can you splitscreen htop and something else on there? Might use the one that's double the size/resolution

hardy plaza
#

I've used the 240x135, the 200x200, the 320x240, and the full-Pi size one (can't remember the resolution of it). Obviously the bigger ones are more useful, but the 200x200 would be good if you're going to vertically split screen.

raw solar
#

Oh, there's a 200x200? I only saw 240x240

hardy plaza
#

Ah sorry, you're correct.

raw solar
#

Ah, brain typo

#

I thought there was another one I missed XD

hardy plaza
#

I'm wrong gender for multiprocessing functionality and am in the middle of coding, reading The Guardian, drinking my tea, and dealing with my cat ecking behind me. Buffer overflow...

raw solar
#

Lol, that's bound to happen

vale raptor
#

What is the partnumber of the raspberry pi 3b RJ45 Jack? It snipped off and I want to replace it

uncut lagoon
#

i would assume that anything that fits is fine?

#

i dont know about hardware

umbral sable
#

RJ45 is the Ethernet jack, not audio.

uncut lagoon
#

🤦‍♂️

#

ive never seen "jack" being used for an internet port

#

and skipped the rj45

#

idiocy of mine

#

FOUND IT

#

A70-112-331-N126

vale raptor
#

Is it the same as on a regular 3B? I mean not 3B+

uncut lagoon
#

can't find anything about the 3b

#

the 3b and 3b+ seem to be the same

#

possibly faster cpu or more ram

vale raptor
#

Well okie thanks 🙂

raw solar
#

I think they're the same parts and layout aside from CPU and RAM, yeah

uncut lagoon
#

yeah, i think too

#

the accessories for pi 3b and 3b+ are exactly the same too

feral folio
#

anybody know a good place to ask about device tree overlay stuff and/or DSI displays on the raspberry pi? I've built a PCB that has a sn65dsi83 DSI to LVDS bridge chip on it, and I've written a device tree overlay which appears to load cleanly, but it never actually talks to the sn65 over i2c.

raw solar
full estuary
#

is there a trick to getting a macropad to show up as a device in linux? been plugging and unplugging or hitting the reset button while holding down the encoder button, with no luck -- nothing in /dev and nothing in my file browser

#

it shows up in dmesg with Product: RP2 Boot

#

so i'm guessing that's good

hardy plaza
#

Try tail -f /var/log/messages and see what happens when you plug it in.

#

Or maybe also tail -f /var/log/syslog (there are multiple logs on a Pi)

full estuary
#

should i be asking elsewhere if i'm plugging the macropad into my pc? i figured because the brain is a rp2040 this would be the place to ask -- i can take this to #help-with-arduino instead if this isn't the place

hardy plaza
#

I think you're probably fine here. It's not an Arduino. You could also try the Pico Discord server, but people here may be able to help, it's a big community.

full estuary
#

alrighty

#

i've checked the output of dmesg and journalctl -r ( i'm on manjaro, so no /var/log/messages or /var/log/syslog ), and when I plug it in while holding down the encoder I get this: usb 1-4: USB disconnect, device number 9 usb 1-4: new full-speed USB device number 10 using xhci_hcd usb 1-4: New USB device found, idVendor=2e8a, idProduct=0003, bcdDevice= 1.00 usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-4: Product: RP2 Boot usb 1-4: Manufacturer: Raspberry Pi usb 1-4: SerialNumber: E0C912952D54

#

but nothing new shows up in /dev and no new storage devices show up my file browser

gentle briar
#

It could be a driver isn't attaching, or you need a udev rule to create the device node.

full estuary
#

that's probably right, cause it works fine on my windows machine

full estuary
#

i used a modified udev rule from the earlephilhower/arduino-pico repo, still no luck ( i changed the group so it matches the group used for this stuff on Arch: SUBSYSTEMS=="usb", ATTRS{idVendor}=="2e8a", ATTRS{idProduct}=="0004", GROUP="plugdev", MODE="0666" )

#

still no luck

#

but it works on Windows 10 -- i was able to upload a super simple sketch ( just sets up serial and prints out "testing" every second ) by compiling the u2f and dragging it to the RPI-RP2 storage device

gentle briar
#

your journal shows a product ID of 0003 and your udev line shows a product ID of 0004. While that may well not be the issue, I did notice the mismatch.

full estuary
#

i guess all it took was a reset, using udevadm to reload the rules just didn't do it. weird!

#

figured that out because i copied the udev rules from my laptop (where it works) to the desktop, and after a udevadm --reload-rules it still wasn't working

feral folio
#

k, I'm back with my actual question about DSI/device tree: https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=318186 -- basically, I've got a custom PCB with a DSI-LVDS bridge chip on it, and I've made a device tree overlay file. When I load my overlay with dtoverlay, I don't see any actual I2C traffic, even though I can tell (from udevadm monitor, dmesg -w, and ftrace) that the driver is being loaded. What am I missing?

feral folio
#

🤦‍♂️ it seems to work if I add the overlay to /boot/config.txt instead of loading at runtime with the dtoverlay command.

feral folio
#

oh wow, on the 15-pin DSI connector, it's lane 0, clock, lane 1. On the 22-pin connector used by the CM4IO, it's lane 0, lane 1, clock.

lethal flame
#

Hello, I got a problem with my Matrix LED Panel and my Raspierry Pi.
I've got a Raspberry Pi 1 B+, a Matrix LED Panel from Adafruit 32x64 px, the Adafruit Hat for the Raspberry
Pi and a power supply with 1500mAh and 5V.
I installed the library from GitHub (https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/rgb-matrix.sh).
But every time I wanna start one of the demos:
(sudo ./demo --led-rows=32 --led-cols=64 -D1 runtext.ppm) only 2 LED light up.
My question is, is the command wrong or do I have to do a few more configurations?

ripe berry
#

Well, for starters, I don't see that the Pi 1 is specifically listed on the compatibility for the Hat... it's for "Raspberry Pi Model Zero/A+/B+/Pi 2/3/ or Pi 4 with the Adafruit RGB Matrix HAT" Or are A+ and B+ models of "1"?

#

Also, are you sure your demo file is in the same directory, as your command line directs?

#

Lastly, I don't see the runtext.ppm part of your command in the directions for the Hat, and I don't think I've used something like that with my Hat. Here's what the directions say ```

Here’s how to run one of the examples — a rotating colored square. Because this code is performing low-level hardware operations, it must be run using the sudo command:

sudo ./demo -D0 --led-rows=32 --led-cols=16

That’s for a single 32x16 pixel RGB matrix. If you have a different size, change the --led-rows and/or --led-cols values. Add a --led-chain value if multiple matrices are chained.

There are 12 different examples in the demo program (0 through 11), chosen with -D. For a full list of the program’s options, just type demo.

narrow wave
#

A+ and B+ on their own mean 1A+ and 1B+

ripe berry
narrow wave
#

I only really got into Raspberry Pi's with my 4B, so I get that! I just remember feeling awed at my friend's model B when he got it, how such a small thing was a computer, probably early 2013? I'm just glad I get to own one myself now

lethal flame
#

so is it possible with the rbp 1 b+?

lethal flame
ripe berry
lethal flame
#

i tried the command "sudo ./demo -D0 --led-rows=32 --led-cols=64" but that wont help 😦

ripe berry
#

I would just suggest, then, if your demo file is in the same directory as your command directs and it's still not working, go carefully step-by-step through the tutorial.

lethal flame
#

but the power supply should be enough right?

ripe berry
#

Check the requirements. I use a 16 x 32 and I have a 2A power supply. The large 32 x 64 matrix at Adafruit says the power requirements are 5V regulated power input @ ~4A (with all LEDs on). If you have a smaller model, tho', power requirements will be less.

#

(smaller meaning smaller size overall, not matrix size)

lethal flame
#

okay

#

so my power supplay with 1,5 A is not enough XD

#

*supply

#

maybe thats the problem why only 2 LED lights up?

faint sparrow
#

I'm surprised very minimum isn't probably 32x64*15mA ie: 30A

hard pike
faint sparrow
#

I mean i've never seen leds under 15mA so i'm surprised there are ones that light enough at like 1-2mA

#

especially RGBs ones

ripe berry
#

These are probably not continuously lit. Possibly flashing at 60 Hz or something?

faint sparrow
#

It's hard to tell with the lack of transparency on what leds these are exactly

hard pike
#

Max draw of sk6812 is 40mA

#

That’s with all three colors on at full brightness

#

10% brightness is just 4-5mA

#

And sk6812 are plenty bright at 10%

#

Single color will probably be around 1.3mA at 10%

#

If you average 3mA per LED, that’s 1/5 of 30A or around 6A for all

#

Even then, it’s not likely that you’ll even get close to 6A so 4A is probably more than enough

faint sparrow
#

I have a 96x8 RGB display.

#

Maxes out close to 999 mA.

#

800 mA seems typical.

#

That'd work out to 1.3 mA per one (of 768) LED's during a self-test with all pixels lit.

#

Maybe 0.433 mA per color element.

#

(I don't know if it's RGB or RGBW).

#

768 locations lit in 'pure' white for this test.

#

Definitely under 1 Ampere.

#

(at 5 VDC)

hard pike
#

Are those neopixel compatible?

faint sparrow
#

No, it has an STM32 secondary board that handles the comms; I don't know what handles the display itself.

#

I am fairly sure the pixels they make can be had individually and would very likely need to be SMT.

#

I don't now how they constructed the one I have. ;)

umbral sable
#

It's likely multiplexed, so the peak current per LED is higher than the average.

burnt scarab
#

Hi there I have a question in regards to a PI zero

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I had my pi zero plugged in and running and I unplugged the mouse and key board by removing the micro usb cable as well as pulling the hdmi mini for the display. I left the power cable plugged in. My thought was the pi zero would stay on and when I was done with the mouse and keypad I could bring it back and continue where I left off. When I plugged the mouse/keyboard back in as well as the display cable I could not view anything on the screen. Eventually I just had to unplug the power to recycle power back. At that point the pi was back up. Is there a way to complete what I was attempting. Is there a way to wake up the pi after I plugged the external devices back in?

ripe berry
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Have you tried disabling sleep?

burnt scarab
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I did not...

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So do you think that the pi went to sleep and then when I plugged the mouse/keyboard back in it couldn't recognize the hardware and wake it up?

steady rose
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it could be something else related to hot plugging the HDMI. what's the goal?

burnt scarab
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come to think about it....I do not belive the PI zero goes to sleep

burnt scarab
steady rose
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share display also?

burnt scarab
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No, just the cable.

uneven solstice
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With two different Pi Zeroes, one of them W, I noticed that it's possible to cause a system freeze when plugging/unplugging USB devices, requiring to power cycle them. I imagine it's something power related (not lack of power, but the change), as it's more likely to happen when I connect or disconnect a 4 ports hub with an USB camera, Arduino Mega and WiFi module

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It can happen regardless if I use an 1A power bank or a 5A power supply

burnt scarab
raw solar
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Is fan control under raspi-config in degrees C or F?

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It doesn't specify, but I have a feeling it's in C?

hardy plaza
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The value returned by the OS is in Celsius.

ripe pike
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👋 is there a way to follow / download the nightly raspberry pi OS builds? I'm hoping to test out the new bullseye packages sooner than the official release

steady rose
final kiln
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anybody know what's the best touchscreen display to use with Adafruit CYBERDECK HAT on Raspberry Pi 400

ripe pike
south tusk
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The only quirk I'm trying to figure out is an RGB test pattern that comes up for a few seconds when the screen is powered up. Trying to interrogate the display and figure out how to disable this test pattern. Can't look professional with a big a** random rainbow gamut in the middle of the screen on power up.

uneven solstice
quaint river
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I'm trying to understand what the typical/standard procedure is for configuring an image prior to deployment. I want a workflow where once I burn the image to an SD card, I don't touch it after slapping it into a pi and booting up -- so for example, if my image is for a kiosk mode dashboard web page viewer, that image would already contain wifi configuration and a URL to load. My assumption going in was that this would mean hooking in to the OS build process, but I'm starting to get the picture that it's far more common to use a /boot partition on the image to add special files that the OS knows what to do with once it actually boots. My question is, can this be realistically automated? Say I'm using a Mac as my development machine, and I have a code repository with files that define the configuration for each deployment. Is it possible to script/automate modifications to a prebuilt image to include those extra boot files, producing a new image that is ready to be burned to an SD card?

steady rose
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there's limited config automation available via /boot

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wifi. enable ssh. hostname.

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there's also a "first run" script feature

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you can also go through all the setup one time and then make a new image of the resulting SD card and then use that for subsequent images