#help-with-linux-sbcs

1 messages · Page 22 of 1

west sierra
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I am going to guess no because the 40-pin header on the PIM470 is right at the top of the display... Has anyone tried this?

rotund pivot
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there are also analog/digital multiplexer chips/breakouts that could feed into one ADC pin on your MCU (needs digital outputs for addressing) ...just depends as Ed points out what ADC requirements you have

west sierra
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I just really like the idea of a square display, because I like that better for text editors and terminals anyway.

teal laurel
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Hey all! I’ve got a pi 400 arriving Friday and a cyberdeck hat and I’m pumped. I’ve got an adafruit display so I think I’m ready from a hardware perspective to have a great time. From a software perspective, I’d like to go with Bullseye since it’s new. Any word if there’s disruptions to the tft display scripts with the new OS?

west sierra
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What do you get from Bullseye versus Buster?

teal laurel
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New version of the OS based on Debian Bullseye instead of Debian Buster. I assume Bullseye will have support longer.

west sierra
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I doubt there'll be any differences with TFT display drivers.

teal laurel
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Cool. The only reason I ask is there was a big thing about the camera drivers changing.

west sierra
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Well. Then you just wait to upgrade until it's confirmed, or you test it out and see if it works.

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It's not like you can't wipe Bullseye off of the SD card and go back to Buster in a jiffy.

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Only one way to find out about the square display and the hacker hat + Cyberdeck HAT. Happy birthday to me!

hardy plaza
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I have the rectangular Hyperpixel mounted that way on a Pi400 and there's clearly no room for the square one. The Cyberdeck HAT mounts at a fixed angle and the square display would be way too tall. The CYBERDECK HAT can mount only HATs that are roughly the same dimensions as the HAT itself, there's only about 5mm clearance below it.

west sierra
hardy plaza
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It's a bit of a shame the HAT isn't mounted on a hinge, which would permit it to be angled backward. I'd probably recommend one of the Hack3r HATs and a ribbon cable. You'd need to rig up some kind of stand but you could then place it wherever you like.

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There's the Flat HAT for the Pi400 as well as the Sparkfun one, but they would mount the display on the same plane as the keyboard, so that wouldn't really work out so well.

west sierra
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Thanks. I think I am going to try rigging with a flat cable. Can probably 3D print something. I just really like that tall display. I figured it wouldn't be easy, but hey...

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and the black hat hacker

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https://www.adafruit.com/product/4673 I was thinking this one just to see if it'll work, I ordered it together with the display

Pimoroni HAT Hacker HAT

For when two (mini) HATs are better than one! A nifty prototyping tool for connecting multiple mini HATs (a.k.a. Bonnets, pHATs, Zero-HATs, etc!) to one Pi.This HAT gives your Pi two sets of ...

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then possibly use the stand-off mounts that come with the square display (or I have a bunch of stand-offs somewhere in my lab).

pale pewter
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Good morning. I'm working on driving an 8x8 Matrix with a RPi Zero W (the earlier one, not the 2). I previously have done this successfully with an Arduino. This time around I've gotten the Pi to light up individual pixels on the Matrix, but now I want to draw alpha/num characters.

When I did this with the Arduino I recall there being a separate library to do the text, but after a lot of looking I can't find a comparable library/module for Python on the Pi. Hoping someone can point me in the right direction. Thanks.

ruby night
pale pewter
ruby night
pale pewter
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Thanks. @ruby night I'll take a look. BTW, you may not remember, but I believe we met a few years back at JL's party in E, Maine.

ruby night
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Yes -- I do remember -- Nice to "see" you again.

full estuary
full estuary
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not seeing a no, so gonna ask: is there a trick to getting the faceplate to snap into place? with a rpi 3 a+ and the 2.4" tft hat it doesn't seem like there's enough room for the faceplate to snap into place

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could this be caused by the header on the hat not sitting flush to the pcb ( accidentally soldered mine in at a bit of an angle, fixed with the gentle application of pliers and some brass header spacers )?

lean sparrow
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Hi I have just received a shiny new PiTFT 2.8 display . I am looking for an easy way to connect it to a PI 4

Duh I feel a bit stupid. The first 26 pins have not changed for the Pi 4 . I'll play some more over the weekend.

wheat rain
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This is the 26 pin (2x13) model? I would suggest a 2x13 stacking header (or two 1x13 stacking headers).

civic rune
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the holes on a raspberry pi are 2.54mm/.1" right? That's pretty close to what I'm measuring

umbral sable
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Yes, should be standard 0.1" headers.

steady rose
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holes? like mounting holes? or the header pin spacing?

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if headers, then, yah, standard 0.1" spacing

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the mounting hole size is probably on a board drawing somewhere

civic rune
steady rose
civic rune
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2.7 interesting OK

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THanks, I should have relied on the official docs over a google search

steady rose
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@civic rune were you able to get the mp3 copied off?

civic rune
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I was thanks

steady rose
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cool. that was a bit of struggle.

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but glad you got it one or the other

civic rune
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yeah I have no idea what was done to the pi or my flashdrive to make it not work

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when I redo the system I'm going to use a fresh pi that I know what's been done to

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Is it safe to assume that the red line is 49mm and the blue is 58mm? I may as well just do this board in mm since my critical dims are in mm

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and I think I'm gonna use 0603 instead of 0805, need the space

steady rose
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it maths to that. but assuming is always potential issue.

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the info in the HAT spec may have better details

civic rune
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ok thanks. I'll check that out

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are the HAT specs on the same site?

steady rose
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i think the A+ form factor is same as HAT

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yep. 58 and 49.

civic rune
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nice

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I wish that F360 EDA could do math in the menus where you enter dimensions. Regular F360 can

civic rune
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weird behavior that I can't explain from my pi. I used GPIO3 and GND (shorting them together) and some code to check the value of GPIO3 to create shutdown functionality. The command I used is sudo shutdown -h now. Works beautifully. However the weird part is pushing this button after a shutdown also works to start the pi?? I didn't write any kind of code to do that. Is that a built in function of the pi and can it be transferred to another pin? I need GPIO3 for I2C on my next revision

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I have to sign off in a little bit but just ping me and I'll see it 🙂

umbral sable
civic rune
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ahhh

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OK

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Anyway to transfer it to another pin that you know of?

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I guess I could have two buttons, one for power off and one for power on, so that when I've powered off and am not using GPIO3 for SCL it has another function

umbral sable
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I'm not sure, unfortunately. It might just be the bootloader software, or the pin choice might be tied to the CPU hardware.

civic rune
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Hmm ok. The two buttons thing will have to work

civic rune
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Or actually it seems there are alternate i2c pin configs

hardy plaza
civic rune
hardy plaza
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No, just two, if you check the link. It's pins 3 and 5 for the more common I2C1 and pins 27 and 28 for I2C0.

civic rune
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Hmm

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Well I'll have to get to the Readme when I'm at work next

hardy plaza
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If you want to alter that layout you need to modify the kernel, which is not something most people would know how to do or benefit from. It's probably better to use an I2C multiplexer, which are cheap and easy to use.

civic rune
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I don't think a mux would work for my application but they are useful

hardy plaza
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Yes, technically it's possible to completely alter the Raspberry Pi by modifying the kernel. It's after all just a Cortex CPU and could be turned into a different computer (e.g., RTOS), but the board layout is configured for being a Raspberry Pi. If your application needs more than two I2C buses perhaps look at a different SBC or MCU (the latter can sometimes have a larger number of I2C buses, e.g., the STM32MP157 has six).

ruby night
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ooh -- just saw this -- I have not tried it. Your mileage may vary ... If you want to add the legacy camera interfaces to Bullseye, please click your update icon in the taskbar to update. Then open a terminal (Ctrl-Alt-T) and type ‘sudo raspi-config’, go to ‘Interface Options’ and then ‘Legacy Camera’, and reboot. These camera interfaces are deprecated, and we are not supporting them going forwards. from https://www.raspberrypi.com/news/new-old-functionality-with-raspberry-pi-os-legacy/

pale pewter
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It feels like I'm having a timing problem with my project driving an matrix8x8 (Adafruit Mini 8x8 LED Matrix w/I2C Backpack ) from a RPi Zero. Is it possible that the Pi is sending I2C faster than the matrix8x8 can handle it? I can provide more context if it's useful.

pliant pebble
steady rose
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@pale pewter possibly but not likely. more context would help.

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the HT16K33 has a max I2C clock rate of 400kHz (per datasheet)

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pi zero i2c has ability to go higher, but doing so likely would mean overriding default setting somewhere. typically, 100kHz is used as default

pale pewter
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@steady rose Thanks. Yes, I was just about to add an update to my question. It appears that the Pi can send i2c too fast in some cases. https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/i2c-clock-stretching I changed the rate on mine to the suggested 10000. But now I seem to have broken something else. I'll report more when I figure out what's going on.

Adafruit Learning System
CircuitPython on Linux and Raspberry Pi

Make hardware and interface with sensors super easy using CircuitPython

steady rose
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i don't think the HT16K33 does any clock stretching, so that info may not apply, other than how to change clock speed

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the HT is pretty simple and well behaved. things should "just work".

pale pewter
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That's what other docs and tutorials have led me to believe. But something's going on here that's ultimately giving me the error: OSError: [Errno 121] Remote I/O error.

steady rose
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that could be connection related

ruby night
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FYI -- it looks like the camera support is either legacy or libcamera, not both

turbid rivet
pale pewter
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@steady rose I agree. I'm actually working here with a chain of 8 of these. They worked as expected when driven by an Arduino. But something's different here. It may simply be that the Pi can't power 8 or them.

steady rose
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that could be

turbid rivet
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Arduino is powered by a 5V bus, so it could have something to do with the logic level difference?

steady rose
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does it correlate to number of total LEDs trying to be lit?

turbid rivet
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I do know the HT16K33 is a 5V device, so you would have to make sure it's powered with 5V, and if that doesn't do it, you could consider level shifting the I2C signals to 5V as well.

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Based on the datasheet, I would believe it does need level shifting to 5V logic.

steady rose
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how are you attaching all 8? the mini backpack address jumpers only support 4 different addresses?

turbid rivet
steady rose
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my project driving an matrix8x8 (Adafruit Mini 8x8 LED Matrix w/I2C Backpack ) from a RPi Zero

(from above)

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the mini is the one outlier that doesn't expose all 3 HT addr pins

pale pewter
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@steady rose My bad, I do have the non-Mini version. Three jumpers for setting addresses. [This is the one with the non-sequential layout of the jumpers, so you have to think harder when setting them. 🙂 ]

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@turbid rivet Good catch. I WAS powering them with 3.2v. Although changing to 5v doesn't seem to have solved my problem. Still debugging. (Interestingly, I earlier had the whole array of 8 matrices working, only one pixel lit up at a time, but on 3.2v. Go figure.)

steady rose
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are they all showing up OK in an I2C scan?

pale pewter
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@steady rose That's a good question. Unfortunately I've been unable to install that tool so far on this Pi. I had backburnered that question, but maybe I should figure it out, and get that answer

pliant pebble
steady rose
turbid rivet
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Yeah, 3.2 is definitely out of spec. Do you have the means to level-shift the I2C signals to 5V?

pale pewter
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@steady rose Not sure exactly what I tried to install before, but it failed with an error I didn't understand, so I set it aside. But the one you just pointed me too installed OK. Thanks.

steady rose
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what OS are you running on the pi?

pale pewter
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@turbid rivet Hmmm. I hadn't realized there could be a different voltage level for the i2c. Looking into that now.

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@steady rose Raspian Bullseye

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Bullseye, that's the name of the new one, yes?

turbid rivet
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Devices typically use their default logic levels for I2C. Most Arduinos would default to 5V, while the Pi handles all logic at 3.3V. Most hobbyist controllers use 3.3V or 5V, but I've seen them go as low as 1.2V in certain applications.

steady rose
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you may have run into a apt issue of some sort. but you'd likely get similar issue trying to install anything.

turbid rivet
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The HT16K33, unfortunately, needs a voltage of at least 0.7 x Vdd, so 3.3 isn’t enough to drive it. Proper level shifting is recommended, but it might be possible to lower the supply voltage of the matrices to 4.5v if you have the right kind of diodes on hand…

steady rose
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sudo apt get update
sudo apt get dist-upgrade
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^^ try that combo and then try installing i2c-tools again

turbid rivet
pale pewter
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@steady rose I got i2cdetect installed. It is NOT seeing the matrix devices.

steady rose
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ah. ok. sry. im bouncing around.

turbid rivet
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Wait, the learn guide has it wired to 3.3v power for python/CP wiring? How does that work?

steady rose
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the 3.3V usage comes from just trying it and it ends up working (despite datasheet)

pale pewter
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@turbid rivet Yes. How? I'm also looking at that tutorial that got me started on this, and it clearly shows a Pi driving one of these HT16K33 backpacks.

steady rose
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at least for basic use cases

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but for chaining 8, may be no longer getting away with it?

civic rune
steady rose
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i've had no issues using 1 or 2 of these at 3.3V

pale pewter
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Thanks all for the help. I'm gonna regroup a little, reread all the stuff I've looked at already, and maybe even start from scratch. (It's a learning experience.)

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I'll definitely test with only one 8x8

turbid rivet
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Maybe the manufacturer just never tested 3.3v logic then. I guess 3.2v is bad, and you can't maintain 3.3v with that many of them chained together.

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If you have an external voltage source for, say, half of the displays, perhaps it'll work better?

civic rune
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I'm just catching up on the convo, discord loaded the conversation at your comment and I replied. Many of them might be an issue yeah

turbid rivet
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Combining 5V power and 3.3v logic definitely doesn't seem to work.

pale pewter
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@civic rune Thanks. That's a useful datapoint.

civic rune
steady rose
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some of the breakouts have 5 pins - with two separate "power" pins - one for power-power and one for logic-power

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or logic level

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in those cases, it's mainly the LED part itself that is requiring >3.3V

turbid rivet
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Well, 8 matrices will draw a maximum of 1.28A, so if you try to drive more than 40% of the LEDs, you'll hit the Pi's current limit and the voltage will start dipping?

turbid rivet
steady rose
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yep

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the HT itself seems to be totally fine at 3.3V though

pale pewter
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UPDATE: I've backed everything to an earlier build: The 8x8s are powered with 3.3 v from the Pi. The i2c is apparently at 3.3v. I returned the i2c baud rate to its default.

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I'm running an earlier practice script that scrolls a single lit pixel across all 8 8x8s. And it works just fine. So is seems I didn't damage anything. More to come...

ruby night
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@hushed vortex FYI -- with new support for the legacy camera < https://www.raspberrypi.com/news/new-old-functionality-with-raspberry-pi-os-legacy/ >I was able to get my braincraft up and running with raspistill working under bullseye.. The only issue I had was that at the very end - after installing pitft, I had to go back to raspi-config and re-enable the legacy camera support -- even though I quite sure I had done earlier, it must have gotten reset somewhere along the way. Anyway -- nice to have it back up and running. I have not tried the tensorflow demo, yet --- later today or tomorrow. Note: if you use the legacy camera support, you cannot use libcamera.

Raspberry Pi
"New" old functionality with Raspberry Pi OS (Legacy) - Raspberry Pi

We are releasing a 'legacy' version of the Raspberry Pi OS based on Debian Buster, to provide a continuity option for users who require it.

hushed vortex
pale pewter
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Just to give you some context, here's my dev assembly. The Arduino is no longer connected. The single pixel you see is in the process of scrolling across all 8 8x8s. The goal here is a "message scroller" device. I was in the process of getting it to display text when today's problems arose. More to come...

IMG_1704.jpeg
pliant pebble
hushed vortex
steady rose
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@pale pewter are the headers soldered on? looks a little thin in the photos

ruby night
hushed vortex
pale pewter
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@steady rose Yes they're soldered. It was one of my early efforts, so it may benefit from me revisiting it.

steady rose
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it looks like too much of the pad (copper ring on PCB) is still visible on a lot of the pins

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would indicate an un-solder issue, i.e. needs a bit more solder

ruby night
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@hushed vortex First snag with tensorflow on bullseye ```sudo apt-get install -y libatlas-base-dev libhdf5-dev libc-ares-dev libeigen3-dev build-essential libsdl-ttf2.0-0 python-pygame festival python3-h5py
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-pygame is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-pygame' has no installation candidate```

hushed vortex
ruby night
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sounds good! It was worth a try...

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From that article, looks like Buster will be supported for a few more years.

hushed vortex
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That's good at least

ruby night
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using python3-pygame gets it moving again

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got as far as pip3 install ./tensorflow-2.3.1-cp37-none-linux_armv7l.whl ERROR: tensorflow-2.3.1-cp37-none-linux_armv7l.whl is not a supported wheel on this platform. may need to look at some updates .....

hushed vortex
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Yeah, there's probably a newer version

pliant pebble
pliant pebble
ruby night
hushed vortex
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It might be more like how Microsoft supports old versions of windows for a few years after a new version is released.

past zinc
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Does anyone know if you can set the brightness of a section of pixels instead of forcing an overall brightness?

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I'm using the Neopixel python scripting on a raspberry pi

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I only see brightness set when declaring the pixels alias

umbral sable
past zinc
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What's the main detriment to having all pixels set to 1 brightness? is it a power draw limitation or could it cause damage to the pixels themselves?

umbral sable
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I don't think there's any limitation to running everything at maximum brightness, assuming your power supply can handle it. The pixels should be designed for it.

past zinc
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sweet, yeah it seems like I'm running about 504 pixels with 150 watt power supply so I should be good.

umbral sable
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You probably already know, but when you have many pixels, it's good to inject power at multiple places via separate wiring, rather than having a long string of 500 in a row, etc.

past zinc
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yeah, I was thinking about that. I do have a 2nd wire to inject more power, I just need to tap into the power leads. just doing testing right now to see if it's all going to at least do what I want

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it's all running from the same power supply, I just have an unused 2nd lead right now

white sigil
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Hello, I am having issues with the 3.5 inch LCD backpack, I have gone through the easy-install script process several times. It works just fine when I configure it for the console but when I run the script again for desktop / fbcp it just displays a black screen after rebooting. Plugging HDMI in shows an image (at low resolution)

marsh narwhal
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How to run SPI?

civic rune
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You may need to setup spi in raspi-config.

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Go to the terminal and run raspi-config

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Or possibly raspi config not sure

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Then one of the options will have a sub option for initializing spi

teal laurel
turbid rivet
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If they’re spaced out enough, it shouldn’t be too bad, but it’s a possible concern you should be on the lookout for when you test it.

marsh narwhal
civic rune
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Hmm I don't own one of those so I can't help unfortunately

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It'll help if you're more specific with your issue. Your initial message wasn't verbose enough for specific help :)

faint sparrow
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Anybody available to chat?

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i wanted to know, How can i run an application like "Image Viewer", "VLC", "Chromium" or any other application from raspberry pi terminal?

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Nevermind

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Now i want to know how can i close the application from the terminal

civic rune
hardy plaza
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Just search "vlc command line". There is a wiki.

faint sparrow
civic rune
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Sure thing

faint sparrow
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Do you know how can i open and close an application using python? i tried some the OS.system and Subprocess libraries but once the application is opened using thos methods, The python scripts doesn't move forward, it keeps waiting untill the application get's closed

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So for example,
by using the OS library

os.system("onboard")```
*onboard is the application name i want to run
hardy plaza
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@faint sparrow, there's also the --play-and-exit argument, which is probably a lot easier.

faint sparrow
faint sparrow
hardy plaza
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Whatever you're using to open vlc from the command line, you just add that argument.

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E.g.,

os.system('vlc --play-and-exit ...')
faint sparrow
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error: no such options

hardy plaza
faint sparrow
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as i've mentioned the application i want to open is the onboard

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which is the virtual on screen Keyboard

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i just mentioned VLC just to give an example of the default applications comes with raspberry pi

hardy plaza
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Oh, sorry, in your original message you'd mentioned vlc.

faint sparrow
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So in general any application

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do you have any solution for that?

hardy plaza
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You need the PID of the onboard command in order to kill it. Using pkill is not really the proper way to do it, as you may end up killing things you shouldn't. Generally speaking you want to just kill the specific process.

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All of this kind of thing can be done via os.system in python or via other python libraries that interact with Linux.

faint sparrow
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pkill -x onboard

hardy plaza
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Yeah, that works but is not a good practice. Like if you do pkill -x python you could have massive side effects.

faint sparrow
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but i won't do that

hardy plaza
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But I'm not here to lecture you on good practice, really.

faint sparrow
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you know what, executing any command on terminal can have massive side effect like if you do sudo reboot
it can actually reboot the pi

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wow

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Dangerous isn't it?

hardy plaza
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Yes, of course. You can delete your entire OS. You can shoot yourself in the head. We don't generally do these things.

faint sparrow
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That's why we should not use Terminal

hardy plaza
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No, that's why we should understand the commands available in Terminal.

faint sparrow
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Yeah so that's why when we use pkill -x onboard it only kills the onboard and it's subprocesses not python

hardy plaza
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I've been predominantly a command line user for over 30 years. (And I don't wear suspenders or have a pocket protector.) The command line is very powerful and there are a lot of tools available that work very well on the command line. The more you know the more functionality you gain. A windowing environment is by comparison very limited.

faint sparrow
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So Anyway my real question was ...

hardy plaza
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Yes, that is correct. I'm just trying to say that the general way to do that is to obtain the actual PID number and use that to kill the process. It's a good skill to have and to know how to do. Part of using a computer over time is to gain skills one doesn't already have.

faint sparrow
hardy plaza
faint sparrow
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okay, forget about the onboard, Let's take any other application, chromium?

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file explorer? ..... THonny?

hardy plaza
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What are you actually trying to do?

civic rune
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Look at subprocess

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I think?

hardy plaza
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In order to find the process you need the PID. That's what the link I provided told how to do.

faint sparrow
hardy plaza
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The process ID is what gives you a hook into the process you just started.

faint sparrow
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let me share the link

civic rune
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Does a program always have the same process id?

hardy plaza
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No, it's basically randomly generated.

faint sparrow
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@hardy plaza I think you are over complicating things

process = subprocess.Popen(['oboard'],
                     stdout=subprocess.PIPE, 
                     stderr=subprocess.PIPE)
stdout, stderr = process.communicate()```
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So basically this is the script i run

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and it opens up the onboard application

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but the problem is

hardy plaza
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You can use stdout and stderr values to provide the returned content of your command. If you use that and the link I provided you earlier to get the process ID (PID) you can then have a hook into the process and/or subprocess.

faint sparrow
# 
process = subprocess.Popen(['echo', 'More output'],
                     stdout=subprocess.PIPE, 
                     stderr=subprocess.PIPE)
stdout, stderr = process.communicate() # script get's stuck at this line untill the onboard application is closed 

print("Ended")```
The string get's printed out after the onboard has been closed not immediately after it opens up the onboard application
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@civic rune

civic rune
faint sparrow
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If i never close the application, the string will never get printed out

hardy plaza
faint sparrow
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i have to manually close the application using the close button on the app

hardy plaza
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Like I said, I don't know onboard. There may be command line arguments like in vlc to close upon completion. But I gotta run now, bye.

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You can also add a "&" at the end of the command line to automatically background the process. Again, in the link I sent.

faint sparrow
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Okay i found the solution to my simple problem to which these guys were complicating, AnyWay if anybody else looking for the solution it was just to use the Popen method instead of all that crap
so var1 = subprocess.Popen('onboard')
and then to close that application simply use
var1.terminate() Or you can also use pkill

pale pewter
ruby night
pale pewter
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Well... I only have 2 out of 8 of my 8x8 matrices up and running, and I'm already seeing the performance price I'm paying by going to Python, from my earlier build's compiled Arduino code. #itsALearningExperience 😉

agile depot
#

Is there a good 3D scanner compatible with the Raspberry Pi that uses something similar to Intel Realsense or LiDAR instead of just an RGB camera?

#

Preferably under $150 (Judging by the Intel prices, I dont even know if thats possible)

umbral sable
agile depot
#

While I have a Kinect 360 I dont know if that would work since it requires 12 volts and a special adapter

#

Its also somewhat bulky to carry

pliant pebble
#

So a Legacy release rather than Ubuntu's style LTS releases

potent hedge
#

Mainly for people who were dependent on the stuff that was deprecated out of bullseye

#

I guess there were way more of those than anticipated

faint sparrow
#

Hi @hardy plaza @civic rune I apologize if my last message was disrespectful to you guys. There is a strong reason why my behavior was like that But I will leave that explanation To some time Later

#

they were just trying to make you follow best practices rather than close an app in a gung-ho way...

civic rune
#

Not to worry on my end. I appreciate the apology, shows maturity. Stress does unfortunate things to us.

hardy plaza
ruby night
pale pewter
#

Aha! (While there's no question that Python is slower than a compiled language...) I figured out what the bottleneck was that was making my display animation flickery and slow. Now it's both smoother, and better fps. Woo hoo! (My apologies, but I had to crow.)

civic rune
#

Nice work!

echo hare
#

hello everyone,
I have a raspberry pi 4 , hx711 and loadcell 5 kg . How can ı work it? I tried but ı didnt work

lucid nebula
#

Hey, I got a question. Could I repurpose an old laptop, format the drive and install RaspberryOS onto it?

civic rune
#

I don't know for a certainty but my intuition says no

#

you could probably apply a regular linux distribution

faint sparrow
#

raspOS is for ARM

#

not x86/x64

wheat rain
hardy plaza
hybrid heath
#

Is there any advantage to using a Raspberry Pi Camera Module 2 over a USB webcam on an RPi 4?

lucid nebula
vocal otter
#

Anyone know how I can find out if a Broadcom Touch IC is compatible with a Pi?

hardy plaza
# hybrid heath Is there any advantage to using a Raspberry Pi Camera Module 2 over a USB webcam...

Advantage? That would depend entirely on what you want to do with it. If you want direct software access to a camera that you can wildly configure, post-process, gain access to individual pixels, etc. then the Pi camera provides that. And because it's not a USB device and its support is built into the OS you get some performance benefits as well (especially on Pis that don't have USB-C support). The Pi camera works out of the box via configuration (raspi-config), whereas with a USB camera you'll be relying on webcam support in Linux (like the Cheese or VLC apps). They're apples and oranges really.

west sierra
#

What's the most robust way of powering a Raspberry Pi Zero W via battery? I was hoping there was something I could use to be able to utilize something like this guy: https://www.adafruit.com/product/354

Lithium Ion Battery Pack - 3.7V 4400mAh

Need a big battery for your project? This lithium-ion pack is made of 2 balanced 2200mAh cells for a total of 4400mA capacity! The cells are connected in parallel and spot-welded to a ...

civic rune
west sierra
#

ohhh

#

2A internal switch (~2.5A peak limiting) means you can get 1000mA+ from a 3.7V LiPoly/LiIon battery. Just make sure your battery can handle it!

civic rune
hardy plaza
#

I'd probably use something like this, as you can (with a multimeter) tune it to 5.1v:
https://www.pololu.com/product/791

...and if you need 5A rather than 2A, there's this model:
https://www.pololu.com/product/2570

Pololu Adjustable Boost Regulator 2.5-9.5V

This powerful, adjustable boost regulator can generate an output voltage as high as 9.5 V from an input voltage as low as 1.5 V, all in a compact, 0.42″ x 0.88″ x 0.23″ package. A trimmer potentiometer lets you set the boost regulator’s output voltage to a value between 2.5 and 9.5 V.

Pololu Adjustable 4-12V Step-Up Voltage Regulator U3V50ALV

This powerful boost regulator efficiently boosts input voltages as low as 2.9 V to a higher, adjustable output voltage between 4 V and 12 V while allowing an input current as high as 5 A.

west sierra
#

I want to put it all in the same case, though

civic rune
#

Hmm

#

Not sure

west sierra
#

yeah, I am trying to figure out...

To make this even more useful, we stuck a smart load-sharing Lipoly charger on the other side. The charger circuitry is powered from a microUSB jack, and will recharge any 3.7V/4.2V LiIon or LiPoly battery at 1000mA max rate.

#

I believe this can be used with one of the 3.7/4.2V batteries, and output 5.2V

#

2A internal switch (~2.5A peak limiting) means you can get 1000mA+ from a 3.7V LiPoly/LiIon battery. Just make sure your battery can handle it!

#

@civic rune we can't read, neither one of us... like top paragraph:

This little DC/DC boost converter module can be powered by any 3.7V LiIon/LiPoly battery, and convert the battery output to 5.2V DC for running your 5V projects.

#

LOL

civic rune
#

Oops

#

I can use my tiredness as an excuse

west sierra
#

me too

#

so I am thinking.... get one of the 18650 packs, either the double or triple, and it'll power that pi ZW for a hot minute

hardy plaza
#

I was powering it from six AA cells (three in parallel).

west sierra
hardy plaza
west sierra
#

yup

#

but, the data is still in there, in the comparison chart

hardy plaza
#

Ah, thanks

#

Both models are very modest in their power requirements 😄

west sierra
#

yeah

#

and I think I can use either one of these two:
https://www.adafruit.com/product/353
https://www.adafruit.com/product/354
Because they say to keep long-term draw under 1A.

Lithium Ion Battery Pack - 3.7V 6600mAh

Need a massive battery for your project? This lithium-ion pack is made of 3 balanced 2200mAh cells for a total of 6600mA capacity! The cells are connected in parallel and spot-welded to a ...

Lithium Ion Battery Pack - 3.7V 4400mAh

Need a big battery for your project? This lithium-ion pack is made of 2 balanced 2200mAh cells for a total of 4400mA capacity! The cells are connected in parallel and spot-welded to a ...

#

this is going to be awesome

hardy plaza
#

So one of those battery packs and one of the PowerBoost 1000s?

civic rune
#

Oh tiredness got me again, I thought you were using another pi. The pi zero 2 is not something I've used yet. I own one but too busy

hardy plaza
civic rune
#

Nice

#

I need to get into concurrent programming. What's an "easy" task to tackle?

hardy plaza
civic rune
#

Let's say Python to start.

hardy plaza
#

There are three concurrent approaches in Python: threading, multiprocessing, and asyncio. They each have their reasons for existing and use cases.

civic rune
#

Hmm ok I'm planning on learning Asyncio for cp so maybe that will he a good jumping off point to desktop Python

hardy plaza
#

Python can't do "real" concurrent programming (like Java) because of the GIL, so which you choose depends on what you're trying to accomplish.

west sierra
#

So, I broke the little black thing on the camera connector on my RP ZW. What do I do?

unknown.png
hardy plaza
#

Asyncio is more mature in MicroPython but one chooses one's own poison, so to speak.

civic rune
#

Yeah I mean to get back to uPy but the community here is so great I stick around

hardy plaza
#

I'd search around for a comparison of the three approaches because they're all valuable, and different.

civic rune
#

Asyncio is like a 1 day old baby in CP

#

But a promising baby

hardy plaza
#

Asyncio is actually quite difficult to get right, in my experience.

#

Very tricky stuff.

civic rune
#

Interesting. In college for uPy we had a tasking suite that the prof wrote. I'll see if I can find out what he used.

hardy plaza
#

You'd probably need to peruse the Publisher and Subscriber classes to understand the MessageBus:
https://github.com/ifurusato/kros-core/blob/main/core/subscriber.py
https://github.com/ifurusato/kros-core/blob/main/core/publisher.py

GitHub
kros-core/subscriber.py at main · ifurusato/kros-core

KROS Core provides the core functionality of a K-Series Robot Operating System (KROS), a Raspberry Pi based robot written in Python 3. - kros-core/subscriber.py at main · ifurusato/kros-core

GitHub
kros-core/publisher.py at main · ifurusato/kros-core

KROS Core provides the core functionality of a K-Series Robot Operating System (KROS), a Raspberry Pi based robot written in Python 3. - kros-core/publisher.py at main · ifurusato/kros-core

civic rune
#

Cool thanks

west sierra
#

alright, ordered that booster and a 6600mAh 3-cell 18650 pack.

ruby night
faint sparrow
#

Does anybody here know any python module that can help me in Connecting Raspberry Pi to a WiFi network?

#

i can use the os.system to execute the commands in the shell to list and connect to the network but, firstly, I want it to be cross-platform (windows + Raspberry Pi OS) Secondly, it is a bit pain in the rear end to manually parse each network name or manipulate the entire command when you are getting inputs and giving outputs to a GUI, So i want a python module that can help me do that, So far i've tried the pywifi module which just doesn't work right for me

peak edge
#

Hey everyone, any one has experience debugging the rp2040

#

what is your set up

turbid rivet
#

Debugging? Are you suspecting hardware issues, or are you just trying to understand the inner workings?

#

For me, the REPL over USB is typically sufficient enough, but I have an extra Pico on the side if I ever need to build an SWD debugger for weirder issues.

#

If I want to observe a certain set of pins, I have a multimeter for measuring voltages and passive circuitry, and a USB oscilloscope for visualizing and measuring changing logic signals and the ocasional power noise.

peak edge
#

I am doing my research at the moment. I want to develop a device and if need be

#

run a debugging session

#

i read that you can debug with another Pico

#

there is the jtag Olimex board

#

i was thinking of Particle Debugger with openocd

#

if some one have already done it

#

i have also read that the guys at raspberry use jlink by segger

#

but they are hella expensive

#

so yeah

#

asking does not hurt

pale pewter
#

Can someone please point me to the spec that tells me how many amps/watts I can expect to get out of the 3v3 pin on this RPi Zero W?

peak edge
#

this is the zero dc-dc converter

#

"Output Current: Up to 1A per Channel "

#

1 amp - (py zero power consumption)

smoky magnet
#

Hi 👋 new to group…and hoping someone can help me? I’m having some issues getting an adafruit st7735 128x128 tft working on a raspberry pi. I hope I’m in the right section I’ve followed the info and installed the correct decencies but everytime in run getting hello world or any other script I keep getting errors. Can anyone please help 🤦‍♀️🤣🤯

solemn finch
#

go ahead and post a link to the tutorial you followed and a copy of the errors you are seeing

faint sparrow
#

Anybody know any solution?

unknown.png
#

was just trying to install python version

Screenshot_2021-12-07_183702.png
smoky magnet
steady rose
#

@smoky magnet where did that image_timed.py example come from?

hoary turtle
#

How much Ram is on the pi zero 2?

hard pike
#

512MB

heavy folio
#

does anyone have any resources for the pi400 keyboard shell as a 3d model?

tidal crest
#

Hello,
which python modul would you recommend for creating a GUI for the raspberry Pi (Touchscreen 7 inch) with multiple pages (with dropdown menu, buttons, text, checkboxes etc.)

steady rose
#

try tkinter as a start, since it's the sort of standard

half nexus
#

I need some help with WS2812B 8x8 hat matrix by waveshare, more importantly, running anything other than demos included. (I'm kinda newbie in this topic)
The pi is rpi 1 model b+ running stock raspbian

pale pewter
#

@half nexus Good morning! I've been working with a Pi Zero driving a chain of adafruit 8x8 matrices. Working in Python I'm using the adafruit_ht16k33 and adafruit_framebuf libraries. Not sure how similar that is to what you're doing, but if so, I'd be glad to help.

half nexus
#

Most of the code for these LEDs I found is for Arduino, which I don't have, which is why I'm using raspberry to drive this hat, which I can't find code to, because (loop basically)

pale pewter
#

@half nexus First, full disclosure: I'm not all that far ahead of you in this learning process, but I'm glad to share what (I think) I've learned.

#

To directly drive one of these LED matrices requires a fair amount of wiring and code. I've seen references to people who have done that, wiring the matrix directly to the dev board. I have not tried that. (although it sounds like an interesting challenge.)

#

What I've done is... Adafruit sells something called a "backpack" that does all the complicated electrical stuff, and lets you just connect two power wires, and two data wires, from the Pi to the display. You might want to look around and see if such a support board exists for that the matrix you're using.

half nexus
#

Well, I have what I have

#

Goal of this little project is to chose some Christmas pattern, and put it on repeat as a Christmas three decoration (I know, sounds wasteful)

#

If you want, I can start from scratch, or even try out some other libs

#

Just so it works

#

I don't have a time to play around with it, the deadline is slowly coming as the sun sets

pale pewter
#

Sounds like a perfectly nice project. Go for it.

half nexus
#

And I'm going it for

#

Just with the help of this community

pale pewter
#

I'll do some digging around and see if I can find reference to the "direct wiring" projects I mentioned. I'll post them here.

#

I suggest you post your progress, with some details, here. I, and I'm sure others here, will be happy to weigh in on how it's going.

half nexus
#

The hat works perfectly fine, I guess the only issue is just in software for it. Maybe we could make a Frankenstein out of two codes

image0.jpg
pale pewter
#

Is that lit up connected to a Pi? Or direct connect to power?

half nexus
#

Only to pins

#

I tested pi with desktop USB 2.0 output, and even strandtest.py for about an hour untill I bored

#

LEDs got a little bit warm, but kept temperature consistent

pale pewter
#

One gotcha to watch out for is that the Pi's pins don't generally output enough power (aka amps/watts) to light up all 64 pixels at once. So trying to do so might cause problems.

#

I'll take a look at the repo. Have fun. Report your progress.

half nexus
#

I just recorded it in 60 fps, now I have to crop it

#

This server is boosted to max, so I have 100mb upload limit

#

In person it looks good and really bright, and hurts to look at directly

#

The power of LEDs is controlled in the script itself

turbid rivet
#

If your power supply provides a good enough current limit, there shouldn't be any problems there.

half nexus
#

My power supply is computer USB 2.0

#

Well, I'll use a phone brick on the place

turbid rivet
#

500mA from USB might be a bit rough if you drive full white on all 64, but you should be able to drive about 40% brightness, which is more than enough for most color animations with non-white background.

half nexus
#

Well, this thing won't overcome a standard lightbulb, but surely it's brighter than my phone's flashlight

#

Well, like 64 times :P

turbid rivet
#

It should be plenty bright enough haha

half nexus
#

Well, I'm gonna use this indoors on a cloudy weather

#

So, what are the codes and libs that I can use with it, to achieve the goal, of making it into a Christmas tree decoration

#

LEDs won't be visible directly, so there's no point in shapes, pixel art or text on it

turbid rivet
#

I mean I wrote some minimal scripts in Arduino, so I can't say I have code on hand for the Pi.

#

What kind of visual effects are you trying to design?

#

Are you using Adafruit Blinka, or something else?

half nexus
#

Something like a Christmas tree lights

#

Maybe snowfall effect

half nexus
turbid rivet
#

It may be overkill for a single matrix, but it could be a good reference.

half nexus
#

I can try out and change quantity to 64

#

Well, any other code for the pi ¯_(ツ)_/¯

#

Well, you can suggest anything, if it would work, then it would work

half nexus
#

After not being able to run one of the examples, and idea came to my head to install every lib I know

#

Yeah

turbid rivet
#

Oh, the example requires a text file to contain the coordinates corresponding to the lights on the trees.

#

The instructions in the Github readme mentioned that.

half nexus
#

Yeah

turbid rivet
#

No library is going to account for that hahah

half nexus
#

But this idea struck me like a lightning that I was trying to run

half nexus
#

Alright, one thing at a time

turbid rivet
#

that wiki would also work, though not sure how easy it would be to modify.

half nexus
#

I just want to run some exsisting code, which I currently can't find

turbid rivet
half nexus
#

And some of my previous tries

image0.png image1.png
#

While walking around the lib, I found file called ez_install.py
I ran it

image0.png
foggy onyx
#

Hi folks,

how this https://github.com/ChristopheJacquet/PiFmRds transmits radio waves using gpio ?? As raspberry pi gpio can only give output dc pwm, it cannot output ac and this program also works on dc pwm but radio waves work on ac, how this works how it is possible ??? Can anyone please tell me ??

Some vedios :-

English - https://youtu.be/4yhhW2ekgN8
Hindi - https://youtu.be/YcFn5oJbgi8

GitHub
GitHub - ChristopheJacquet/PiFmRds: FM-RDS transmitter using the Ra...

FM-RDS transmitter using the Raspberry Pi's PWM. Contribute to ChristopheJacquet/PiFmRds development by creating an account on GitHub.

YouTube
Null Byte
Hijack FM Radio Stations with a Raspberry Pi [Tutorial]

How to Hack FM Radio Frequencies with an RPi
Full Tutorial: https://nulb.app/z44hc
Subscribe to Null Byte: https://goo.gl/J6wEnH
Kody's Twitter: https://twitter.com/KodyKinzie

Cyber Weapons Lab, Episode 038

There's an entire spectrum of information that surrounds us. With a Raspberry Pi and some simple know-how, you can take social engineering...

▶ Play video
YouTube
TechChip
Raspberry Pi FM Radio Transmitter tutorial in Hindi | Hijack FM Rad...

In this tutorial I will show you that how to build FM radio transmitter using Raspberry Pi 3? how to make pirate radio station using RPi 3?
how to hijack FM radio stations using Raspberry pi?

Hardware:
RaspberryPi 3 B+ : https://amzn.to/2z3gzTp
SanDisk 32GB Class 10 with adapter: https://amzn.to/2AsRXoW

Software:
https://www.raspberrypi.org/do...

▶ Play video
#

It really works man 🤯🤯

half nexus
#

So

#

What should I run on it?

turbid rivet
# foggy onyx Hi folks, how this https://github.com/ChristopheJacquet/PiFmRds transmits radio...

A digital output, in its simplest form, switches between high and low. It doesn't create the sinusoidal waves typical of regular radio waves, but it can certainly generate frequencies that can be picked up by an antenna tuned into the right frequency. The problem with this method is its harmonics, as square waves generate a LOT of harmonic frequencies, since its Fourier series equates it to a lot of higher-frequency sine waves. In most places, many of these frequencies are strictly regulated, so using this method to broadcast anything ove any significant distance could get you in trouble...

half nexus
#

I dunno what am I doing whrong

turbid rivet
#

Then run main.py.

half nexus
#

Lemme type in

#

It's collecting

# 
failed with error code 1 in /TMP/pip-build-fxezsje7/sysv-ipc/ 
``` nah
half nexus
#

Removing parts of code doesn't make sequences go away ¯_(ツ)_/¯

half nexus
#

Here's what I tried with unicorn hat lib

image0.jpg
#

Maybe we should try merge the codes 🤔

turbid rivet
#

AH, @half nexus you need to be using python3. Python2 doesn't work.

#

At least not with the CircuitPython example? Probably most of them will have problems with the wrong version of Python.

half nexus
#

Ok ¯_(ツ)_/¯

#

Btw, any soft to work with iPhone?

#

When I used raspberry with Android, I just plugged it into available USB port, and turned on the USB hotspot on

#

Because my rpi doesn't have wireless support, it's much harder to do stuff on the go

#

Maybe I'll set one of the few examples to launch on boot. I couldn't find any pattern for it

half nexus
#

I'll ask my teacher on the classroom hour to go to computer lab to configure this thing, and possibly pick something, or write something our own

half nexus
#

This thing is sick

image0.jpg
#

Ofc I'll come here again if I'll get any problems

civic rune
#

Is there any way to safely shut down a pi that you can't really physically get to and cannot ssh into?

umbral sable
civic rune
#

I didn't think so thanks

half nexus
#

Only power outage is the last answer

#

You have to touch the pi directly, or be a super user in order to do such critical stuff

hoary turtle
#

I just got my pi zero 2w. I tried to add the CLEAR case to it, but, it dosnt snap on. There’s a black small stub that’s sticking out on the back inside…. It seems to be stoping it

pale pewter
#

Is adafruit shipping Zero 2 Ws? <excited>

#

😦 apparently not.

civic rune
#

I got one from them

pale pewter
#

I'm on the list to be notified. Waiting (mostly) patiently.

west sierra
#

I got one from Pimoroni.

#

But, that was an expensive shipping cost. 😄

rain timber
#

I use the sample code for (https://pypi.org/project/adafruit-circuitpython-bmp280/) to use my BMP280 with my Raspberry Pi zero W and i get this error ImportError: No module named adafruit_bmp280

However, I have installed the library by using pip install adafruit-circuitpython-bmp280 and pip3 install adafruit-circuitpython-bmp280

#

I2C is also enabled

#

I need altitude

civic rune
#

I don't think this is it, as I haven't needed sudo in the past, but perhaps sudo pip3 install...?

rain timber
#

Ill give that a shot!

#

Still didnt work,

#

Do i need that library for using the BMp280?

civic rune
#

Oh sorry the ...s were because I'm on mobile

#

It would be the full text of the call to pip3 with sudo before it

rain timber
#

nono i put all of that

civic rune
#

Hmm I'm not sure what's wrong. What you did should have worked

rain timber
#

Itsaid "requirementalready satisfied" andthen when running the code it said No module named adafruit_bmp280

civic rune
foggy onyx
civic rune
#

It's complicated

foggy onyx
hoary turtle
#

When you “cluster” Pi Zeros together, does that add up the RAM?

opaque wagon
#

No

#

You need a special program to distribute tasks to all of them and then collect the results

#

And most programs don't support something like that

rich vale
#

Hey, peeps, I have a question related to Image Processing. which camera is used to get a sense of an object (by Computer Vision) either by video processing or image processing because we are building a semi-autonomous bot to detect weeding to spray precision pesticides(only required amount of chemical to overcome bunch amount of chemical wastage as well to move small cultivation forward from blanket spraying to precision spraying)

umbral sable
rancid pecan
#

i'm curious to learn the pros/cons of using circuitpython vs ardino for the MacroPad RP2040. Any thoughts?

umbral sable
rancid pecan
#

I'm building the macropad to be an interface with VoiceAttack software (macro and voice control for apps/games). I've figured out how to do various key settings/combinations in QMK previously, but the echelon functionality will be to enable two-way comms between the RP2040 and a C# app (VoiceAttack) on the host PC.

shut fog
#

Which pin is Board.D18?

rancid pecan
#

And QMK is C++ based so i have some familiarity there. But python seems very good to know these days

rich vale
rich vale
umbral sable
rich vale
#

There are varieties of cameras available which suits for our project I mean there's is a computer vision equip with pre processing (IP techniques) so which one is best

turbid rivet
rich vale
rich vale
turbid rivet
#

Well, I don't have any experience with imaging droplets outside, so I don't know how much my opinion would be.

#

You might have to just pick a camera and see how well it works...

rich vale
#

Umm

turbid rivet
# rich vale Umm

If you're really unsure, take a picture of your weeds and your spray and see if your resulting images are processable with your software.

#

If the image quality is insufficient, you can use that as a basis to gauge what your camera needs would be.

umbral sable
#

If you start with a clear, high-res image, you can down-res or blur it after the fact to see how bad of a quality you can live with.

turbid rivet
#

The weed detection might be super tolerant of any cheap image sensor, but I imagine properly imaging the spraying of pesticides will take a lot more experimentation.

rich vale
turbid rivet
#

Unless I'm misunderstanding the purpose of the computer vision, and you don't need the spray visualized at all...

#

As someone who deals with 3d printing of wax models, I know there are other ways of controlling fluid output, though precision does vary based on the dispensing solution.

umbral sable
#

(Amusingly, now I'm imagining that over time, this sort of device would cause weeds to evolve to mimic the appearance of legitimate crops, specifically to fool computer-vision algorithms.)

turbid rivet
#

@unique tulip are you proud of me

unique tulip
#

I am simultaneously excited about the prospect of mechanical weeding and plant care but, at the same time, I've seen enough saucy Dr. Sarah Taber tweets retweeted into my feed on the subject of automating farming and doing it wrong.

rich vale
#

Umm ya tell me abt that concept dude if u know something that would help us

unique tulip
#

OTOH, doin' it for funses is absolutely different from being an MIT Media Lab startup thing that failed to build the sort of growth chamber that mainstream science has been building quite successfully since 2001.

#

Citizen science is great.

#

Also, there's this: https://carbonrobotics.com/

Carbon Robotics
Carbon Robotics

The Carbon Robotics LaserWeeder solves one of agriculture's biggest problems: weed control. Laserweeding kills weeds without herbicides or tilling by harnessing computer vision and thermal energy to identify and destroy weeds at the meristem. It's healthier for crops and land, and safer for farmers.

#

But, like, I don't think that solves everything, which makes a precision sprayer useful. Because, like, crusty bits on a leaf can be zapped on a laser, but it might be overall better to apply small amounts of chemical.

#

Also, it's very likely the case that you want hyperspectral imagery. It's REALLY easy to pick out living plant things if you are looking at the near-IR band that normal cameras reject.

civic rune
rich vale
rich vale
umbral sable
rain timber
#

Using the sample code for circuit python Bmp280, i get this error

i2c = board.I2C()   # uses board.SCL and board.SDA
AttributeError: module 'board' has no attribute 'I2C'
turbid rivet
rain timber
#

RPI zero w

ripe pike
rain timber
#

Im sorry i forgotto mention it, i reinstalled board and it works

half nexus
#

(dug up from general)
Hello there! Anyone know some sound/music visualiser for piromini unicorn hat/waveshare led hat(b)

plush wave
#

Hi all just a quick one is there a way to turn off the mass storage on the pi pico

umbral sable
turbid rivet
plush wave
humble marsh
#

they can't be printed, since there is no USB to print to

#

so they are put in that file

plush wave
humble marsh
#

what is in boot_out.txt?

#

if you want to disable CIRCUITPY, that is done in boot.py, as described in the guide above

#

that's also where you define new HID devices

plush wave
#

Adafruit circuitpython 7.0.0 on 2021-09-20; raspberry pi pico with rp2040
Board ID: raspberry_pi_pico

humble marsh
hard pine
#

can someone answer a quick question

#

from this page: https://www.adafruit.com/product/2345

Power protection circuitry - you can plug a 5V 4A wall adapter into the HAT and it will automatically protect against negative, over or under-voltages! Yay for no accidental destruction of your setup.
it also links to https://www.adafruit.com/product/1466 as the recommended power supply

Adafruit RGB Matrix HAT + RTC for Raspberry Pi - Mini Kit

You can now create a dazzling display with your Raspberry Pi Model Zero/A+/B+/Pi 2/3/ or Pi 4 with the Adafruit RGB Matrix HAT. This HAT plugs into your Pi and makes it super easy to control ...

5V 4A (4000mA) switching power supply - UL Listed

Need a lot of 5V power? This switching supply gives a clean regulated 5V output at up to 4 Amps (4000mA). 110 or 240 input, so it works in any country. The plugs are "US 2-prong" ...

#

my question is this

#

do i need a switching power supply, or just any 5v 4a, or literally anything that can supply at least 5v 4a or more

#

how regulated does the actual power cable have to be

#

because it sounds like the HAT controls the voltage

#

asking because i really want to buy a cable without one of those boxes in the middle, i want to hang my project on the wall or put it on a high shelf

#

so i can't have a heavy weight in the middle of the power cable

#

could i just plug the USB end into the wall via an iphone brick or whatever

#

tldr i'm just wondering how much power regulation is needed in the cable

#

that last one basically does nothing and probably delivers the full 240v or whatever

#

right?

#

also lmk if there's a better place to ask about general electric stuff

turbid rivet
#

@hard pine Nobody really likes having to deal with wall warts on our outlets, or the annoying brick halfway up the power cable. The problem is that it's really rare to find a smaller USB brick that actually supplies more than 2.1A, and I personally wouldn't trust any number higher than 3.

#

Anything that could supply the 5V 4A would be fine, though the switching ones tend to be more power-efficient than the linear alternative.

#

Since the actual current is based on the load, any supply with a higher current rating is fine as well.

hard pine
#

thanks, so does the power regulation on the HAT protect against surges or actually reduce the current to 5v 4a

turbid rivet
#

No, it only protects against surges. There isn't any actual voltage regulation onboard, only overvoltage and undervoltage protection.

hard pine
#

kk

#

?

turbid rivet
#

If that works for your project, go for it.

#

It's easier to get AC extension cables if you really need the space, anyways.

#

The big bricks can be managed with a well-designed mount, if you can get creative in camoflauging it.

#

Wall warts are easier to manage, but can be frustrating when you run out of outlets...

hard pine
#

alright ty

pale pewter
#

Arghh. Yesterday afternoon I got the email that the Pi Zero 2 was back in stock. But it went into my spam folder (I don't know why, but I'm definitely fixing that), and by the time I discovered the email, the item is out of stock again. ☹️

ripe berry
#

Don’t worry, I didn’t see it until about 1 hour later and they were all long gone by then! 😆

west sierra
#

I have a Raspberry Pi Zero W with an Adafruit Mini PiTFT - 135x240 on top. I am running a slightly modified version of the stats script from the https://learn.adafruit.com/adafruit-mini-pitft-135x240-color-tft-add-on-for-raspberry-pi/python-setup page, main difference is I am currently using sched to fire off events. Some to refresh the screen, and one to time out and kill the backlight to save power by not updating the screen until the button is pressed.

Are there any ways of using something similar to Alarm with a Raspberry Pi, where I can pause the script until the button is pressed? Or, does running a fairly tight 0.1s loop with a check to see if a button is pressed consume a lot of power? Goal is to power this entire rig with a battery.

#

This is the code mods I have done:

def show_stats():
    # the code from the regular stats example


def turn_off_display():
    backlight.value = False
    printing = False
    if not s.empty():
        for ev in s.queue:
            s.cancel(ev)


while True:
    if printing:
        s.run()
    if buttonB.value and not buttonA.value:
        printing = True
        backlight.value = True
        s.enter(0.1, 1, show_stats)
        s.enter(10, 1, turn_off_display)
        s.run()
    if buttonA.value and not buttonB.value:
        turn_off_display()
    if not buttonA.value and not buttonB.value and not printing:
        backlight.value = False
    time.sleep(0.1)
hardy plaza
# west sierra I have a Raspberry Pi Zero W with an Adafruit Mini PiTFT - 135x240 on top. I am ...

I don't use CircuitPython so I can't really provide help there, but in regular CPython or MicroPython there's the concurrency stack. I understand CP has now got asyncio.

In any case, whatever is your main loop will be running on a thread. You can either just loop that thread with a timer, or start a new Thread as a watcher. Or you could use the pigpio library to configure an interrupt on your event. There's lots of options. I'd probably use pigpio since you've got CPython on the Pi available to you. If you're not familiar with the library it's a good one to learn.

west sierra
#

oh cool, so I can run an interrupt with pigpio?

hardy plaza
#

Yes, you'd set a callback on either a rise, fall, or either, on a pin.

#

Having libraries like pigpio are one of the reasons I've so far tended to stick with the Pi rather than an MCU. I've tried porting a few of them to MicroPython and/or used the micropython-lib project's files as a basis.

west sierra
#

Dang! That's amazing.

west sierra
hardy plaza
#

Yeah, that's a thing, hold on a minute... (I'm preparing for a flooded basement tonight)

#

BTW, you can also use the RPi.GPIO library's GPIO.wait_for_edge() method if you don't want to use pigpio. There's no callback and the code blocks until the pin transition occurs. So it's both simpler and less powerful.

#

Regarding the poweroff/wake on GPIO idea, the power down part isn't difficult, you just use whatever is your trigger (could be anything) and call:

import subprocess
subprocess.call(['shutdown', '-h', 'now'], shell=False)

The trickier part is the startup. In this case you'll have a powered-up and shut down Pi. The trick here is to use GPIO 3, which has its own special functionality. Here's a link: https://howchoo.com/g/mwnlytk3zmm/how-to-add-a-power-button-to-your-raspberry-pi

Howchoo
How to Add a Power Button to Your Raspberry Pi

This guide will show you how to add a power button or switch to your Raspberry Pi that can turn your Pi on or off.

west sierra
#

can I not use another GPIO?

#

I have this guy, and those two buttons

#

top is for turning the screen on and output some stats for the wireless AP

#

which I've got working, mostly, but it could probably be better

#

and then I just have a timer that shuts the screen back off after ~10 seconds

hardy plaza
#

Not for wakeup, no. GPIO 3 is special.

hardy plaza
#

That's running 'top'

west sierra
#

and of course it's like the one kind of header I don't have at hand

hardy plaza
#

What I've done is make up a Dupont connector wiring harness to bring the Pi's pins over to the display. I can't mount it on the Pi as the space isn't available and it'd not be viewable.

west sierra
#

makes sense, which parts did you use for the wiring harness?

hardy plaza
#

I bought a kit of assorted connectors from AliExpress, a bunch of single and double row Dupont (0.1") connectors. Some people use a crimp tool, and that's certainly easier, but I hand-solder all mine.

#

I was originally using "Jumper Jerky", the rainbow ribbon cable, and peeling off what I needed. That works, though the wire is a bit stiffer than I like and there's only two lengths available. It's more work but I started making up wiring harnesses for most everything on my robots. It takes a lot more time but I just try to get into my "Zen soldering mind". 😇

west sierra
#

I have a crimp tool, and a bunch of duponts floating about

hardy plaza
#

But the Jumper Jerky works fine in a pinch. There's also Adafruit's pre-made ones: https://www.adafruit.com/product/5070 if you only need a few. You can use a very sharp instrument to unlatch the pins from their sockets and push them into a different socket (e.g., take out the single row pins and push them into a double-row connector.

I would entirely avoid the Dupont male connectors, they're very weak and their little members break off pretty easily. Just use pins, double ended, when necessary.

west sierra
#

lemme see what kind of crap I've got

hardy plaza
west sierra
#

(something off of Amazon)

hardy plaza
west sierra
#

hahahaah

hardy plaza
#

I have a whole basement full of damp crap now.

west sierra
#

it's like, I have some legit great things in my lab, like from Adafruit and SparkFun and whatever, and then there's these kinds of things that are harder for me to find on a site like Mouser or Digi-Key. Still haven't figured out if I even can find the cheap stuff there, or if they only have the trademarked stuff.

#

Like. Dupont connectors. Entire cases full of 2.5M and 3M machine screws in varying length with socket cap hex heads and washers.

#

Bags full of nutserts.

#

You having a flood?

hardy plaza
#

Yeah, since last March the stream next to my house has been diverted (possibly by a tree root) under my foundation, or at least next to it, such that during heavy rains it's now flooding my basement, 20-30cm of water at times. This being New Zealand I can't get a plumber or drainlayer to do the work because they can't be bothered. I'm currently being ghosted by my 7th (attempted) plumber. 😑

#

As to DigiKey and Mouser, you can sort on price and find the cheaper items as well. I know you can buy a mil-spec subminiature toggle switch for $50, but you can also find the cheap ones for a few dollars. They're never be as cheap as AliExpress, but we all pay for that in different ways, so I tend to avoid AliExpress except for things like Dupont connectors. I once bought a torch/flashlight I'm happy with, and buying from the actual Chinese manufacturers of things like the Orange Pi is probably fine.

west sierra
#

I'll search for something like cat 6 cable, and get like $70/foot industrial indestructible shenanigans cable.

hardy plaza
#

Part of what is difficult for me now, is that the US Postal Service will no longer ship to New Zealand, so I had an order to buy a small number of parts from Adafruit but the DHL cost to ship it here is now NZ$64. So I basically have stopped buying from Adafruit, it's just too expensive to ship here. It's actually cheaper to buy Adafruit parts from Pimoroni and suck up the dollar-to-pound conversion that happens there, as I can get Royal Mail shipping for I think about £9.

west sierra
#

AliExpress is definitely a somewhat worse lottery than Amazon, unless you're buying components.

hardy plaza
west sierra
#

but on Amazon you never know... they change names of these stores every few weeks/months, but it's probably the same factories producing the same stuff, and it's probably patent infringement and various other intellectual property laws they are breaking... but, they're in China, and what can you do?

#

Every now and then I get lucky with ordering electronics components off of Amazon, but, I've a few too many incidents so I just don't any more.

hardy plaza
#

What I can't figure out is the USPS won't ship to NZ because it's not profitable enough, yet much of what I can order on AliExpress ships here free. My understanding is that the Chinese government is basically subsidising Chinese businesses (who aren't themselves otherwise profitable) in order to out-compete Western businesses. It's not like that's unusual, the US government has had farm subsidies for decades. The difference here is that it's in technology now...

hardy plaza
#

In any case, dinner time here! ciao!

west sierra
#

I was like trying to figure out if there was a way I could route packages for you through Sweden, but it's not cheap to send packages from there, either it appears. an up to 1 kg package costs ~$41 USD to send to a non European country.

#

(I'm from Sweden, and all my family is there, but I live in the US)

#

oh, that was the parcel service... I think if it's components from Adafruit, I can get them here to me for like $10-11 (sometimes cheaper with USPS), and then ... sending to Sweden is $69.95. No joke. Wow.

#

oh wait, no, $38.20 Sweden, and then from there like $20 to New Zealand. Still sucks. Wow.

dusty wolf
#

Hello. My Wio Terminal has an accelerometer, but no LIS3DH library to connect it. Can I install it on the board, if so how?

west sierra
late kernel
#

Hey - I am using the adafruit 4x7 segment display with the backpack and am experiencing some prolems related to i2c on my raspberry pi.
(I am trying to follow this: https://learn.adafruit.com/adafruit-led-backpack/0-dot-56-seven-segment-backpack-circuitpython-and-python-usage)

  • I know the problem isn't the display because it works fine with an arduino
  • I can run commands like i2cdetect, i2cget, and i2cset and they all work for my device
  • when I run the most basic setup in python:
>>> import board
>>> from adafruit_ht16k33.segments import Seg7x4
>>> i2c = board.I2C()
>>> display = Seg7x4(i2c)

That last line throws an error

#

Any help would be much appreciated

west sierra
steady rose
late kernel
#

sudo i2cdetect -y 1

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

the remote io errors could mean a connection issue

#

something marginal, good enough for scan and one off xfers

#

but not heavier traffic of driver code

#

how is the backpack connected to the pi?

late kernel
#

via 4 female to male wires

#

3.3v and gnd and then pins 3 & 5

steady rose
#

headers are soldered on backpack?

late kernel
#

yeah

#

and they work with arduino

#

so the backpack should be good

#

i also tried another pi and the same error was thrown

steady rose
late kernel
#

yep

steady rose
#

weird. can you post photo?

late kernel
steady rose
#

thanks. one more of other side too if you can.

late kernel
steady rose
#

could also be pi headers - is that a Zero WH? or did you solder headers on pi?

late kernel
#

i did those headers, but I tried it with a 400 and it threw the same error

steady rose
#

try reflowing those header pins and see if it helps

#

no more solder, just reheat with iron and make sure they are wetted out well on the pads

late kernel
#

even though it worked with an arduino uno?

steady rose
#

yah, that's weird, but could be 5V vs 3V got past whatever marginal issue there might be

late kernel
#

should i try 5v on the pi?

steady rose
#

nope. it should just work at 3v.

#

the behavior you are seeing + the current state of soldering = it's worth trying to reflow the soldering first to see if it helps

#

those four pins are all that are needed for talking to the backpack, the LED pins are just for lighting the LEDs, there's no i2c on those

late kernel
#

@steady rose just reflowed - still not working

steady rose
#

same behavior?

late kernel
#

yep

#

ill try the 4 pins im using on the pi but I doubt thats an issue

steady rose
#

if it did same thing on a pi 400, then probably not

#

but still worth checking

#

it could be multiple things 😦

late kernel
#

still nothing

steady rose
#

nothing? or same behavior?

late kernel
#

same behavior

steady rose
#

can you try again on the pi 400?

late kernel
#

sure

#

Now it works with the pi 0

#

Huh

#

So I guess my pi 0’s headers are messed up

steady rose
#

unfortunately it is most likely the soldering

#

but hopefully just reflowing will help

#

the amount of solder looks OK

#

but potentially not wetted out enough on pin and pad

#

key is to get both pin and pad adequately heated, so solder will flow on to both

plush wave
#

Quick question, is there a hid keyboard matrix coding out there.
Want it try a 45 key project with 1 board but some of the buttons need to have double key imputs

pale pewter
late kernel
#

both work

civic rune
pale pewter
civic rune
#

Sure thing. Your method seems to show up in older guides, I think because the helper function didn't exist.

smoky magnet
lost stirrup
#

Hi does anyone have i2c example c language code for feather rp2040?

marsh surge
#

Hello, first time posting here but I got myself into a little pickle i'm wondering if anyone can help me with... So I built a PiGRRL zero as a gift for a friend who is getting deported from Canada for bs reasons during christmas, so i decided to make him something. Long story short I thought I had another 2 weeks to work on this but because of immigration bs that time has evaporated and my last work day is tomorrow. So what I have right now is a fully functional PiGRRL zero with a raspberry pi zero W as a brain. This is the guide I was following and I had 0 problems with the hardware... all the problems came in the software. first I couldn't get emulators to show up with th e default OS posted (but i could run doom and the controls worked) then i realized the automatic method wasn't meant for pi zero W models so I tried manually installing the latest retropie. It runs fine but I couldn't get it to connect to wi-fi (despite seeing the networks) and I couldn't get the controls to work. I'm running out of time quick and at this rate the gift will be a doom exclusive machine. does anyone have any ideas on what to do now?

#

btw here is the project pictures atm

#

Today i'm spending most of my time finishing the case so i'm running out of time to spend sitting at a desk troubleshooting everything. The problem with the most recent retropie was the wi-fi trouble I had (and i got no errors just a couldn't connect to network) I have 0 idea how to properly add support for any of the hardware attached to the pie, and with the older version from adafruit with proper support already implemented for controls and screen support i couldn't get emulators to appear when I added roms. Because of this I feel really stuck, I don't have any more time to troubleshoot error after error which keeps happening, and i know the hardware is functioning perfectly. Does anyone have a pre-made OS or anything like in the comments that's up to date? I have full rom archives as my disposal and if i can just get past that dumb error i should be okay

civic rune
#

That's a very thoughtful gift. I can't offer any help but nice work.

modern tundra
subtle dust
#

Has anyone play with HID mouse emulation with raspberry pi zero ?
I would like to control my mouse with my raspberry pi zero

opaque wagon
violet ivy
#

Hello, I'm trying to get a led strip (ws2801) working... but i can't control the led strip somehow.
I'm using a raspberry pi 4 with adafruit_ws2801 in python and the pins MOSI for data and SCLK for clock.
any ideas?

#

did you restart your pi? no, did you need to restart your pi? yes
fixed 😛

torn mountain
#

Hi all, this is my first time working with a raspberry pi + neopixels, but im having a lot of trouble understanding what is going on. I have a 16 LED ring WS2812, and I've been trying to get them to work by following these instructions: https://learn.adafruit.com/neopixels-on-raspberry-pi/python-usage ( I did have an issue with the second command (sudo python3 -m pip install --force-reinstall adafruit-blinka) Everytime I tried to run this, I'd get an error when Building wheel for RPi.GPIO. Maybe this has to do with the stuff I'm seeing below?

I've been noticing weird interactions with my neopixel ring, when I plug it into different data pins, I get different interactions. With 18, I get only three LED's lighting up random colors, and flickering, when I try to fill with one color like (0, 50, 0).

on other pins, like 21 (which is working the best for me), only pixels 0-12 work, and they don't work correctly for the defined colors. for example, when I fill with (0,50,0), I expect to get all green, but I get alternating yellow, blue, red colors. each pixel interacts differently with each color, and I'm really confused as to what is going on 😦 Sorry for the huge block of text, I'm new to rasp pi, and this kind of tinkering, and I hope somebody can help, thanks. The attached image is running fill with green only (0,50,0) on pin 21. I also have two LED rings and they both share the same behavior, which makes me think its not a hardware issue.

IMG_20211213_234715.jpg
Adafruit Learning System
NeoPixels on Raspberry Pi

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

#

some extra information: I am running this without any level shifting or diode, and only running it off the 5V pin on the pi, (not sure if its okay, but I've seen from googling that for a small number of LED's this shouldn't be an issue), pins 21 and 10 do the interaction where filling will create the alternating yellow, blue red. Pins 18 and 12 won't fill and show, I have to put the fill in a while True infinite loop for the lights to flicker, and only the first few lights flicker.

torn mountain
#

This is what running the while true loop looks like for pin 18

west sierra
#

I purchased a Cyberdeck like a week or two ago, not sure if it's the same rev or not?

steady rose
west sierra
steady rose
#

which guides? the hyperpixel itself is a pimoroni product.

west sierra
#

There used to be a guide for how to hook it up.

#

used to be on the product page, but it's no longer there

#

you know what, I might be confused, because I am looking at the Wayback Machine from October and they're not there either. So, I just made that up. In my head. Like a crazy person. Move along.

steady rose
#

no worries. could be something related? like a project guide?

west sierra
#

Yeah, it was a project guide, but it wasn't the photo one or whatever.

steady rose
#

but in general, since it's a pimoroni product, best to go there for the details

west sierra
#

yeah, I usually do

#

@steady rose so does this mean I should be cutting the trace on my Cyberdeck?

steady rose
#

yep. the guide info is the same as that forum thread.

#

there are two options though

#

let me look at the thread again. the info in the thread is kind of scattered. the guide brings it all together.

#

meh, easier to just enliven the guide page

west sierra
#

one was desoldering

steady rose
west sierra
#

Thank you. Well, I gotta take Trace and Xacto to the doctor. Someone's getting snipped!

west sierra
#

@steady rose I shouldn't have cut that trace... now I've got a round, encroaching blackness coming in from the sides

steady rose
#

on the display?

west sierra
#

yup

#

I guess I just killed my Cyberdeck.

#

I just noticed, the STEMMA connectors are white on this image. They're black on mine.

#

Did I cut too deep, or not deep enough?

#

It shows the boot screen, but then it doesn't show the terminal window

steady rose
#

connector color doesn't matter. that's just a supplier variance.

#

doubt you cut too deep

#

do you have a multimeter? could use that to verify trace is cut.

west sierra
#

Thank you for helping me with this. I would be super sad if I broke it right before Christmas.

steady rose
#

continuity test

#

between those two point

unknown.png
#

actually, measure resistance. since there's still that resistor in line.

hardy plaza
west sierra
hardy plaza
turbid rivet
# hardy plaza No, but I can imagine. The HyperPixels are quite a nice display but as they use ...

I wouldn't call it unusual, since that type of display is actually fairly common. Instead of adding an expensive HDMI chip, products with built-in screens tend to use these DPI displays for reduced cost. Being able to drive a display with GPIO pins is nice, but if you can accept a slightly lower color count, there are ways to free up a few more pins by disabling the less significant bits.

#

It's probably also worth noting that most basic projects only use a few pins, and the more complex projects will offload some of the work to external GPIO expanders or other auxillary devices.

#

I can't speak for older Pis, but I know for a fact the pi4 can definitely support a DPI display and an I2C bus.

west sierra
#

So, I am using this screen as the main display for the OS. I haven't fully settled on a wm yet, but still looking for something quick and easy, yet powerful.

#

Main issue is that these drivers really only work well for Raspbian. And Bullseye is out because of the changes to DPI drivers.

west sierra
hardy plaza
west sierra
thin wraith
#

how would i use this
http://www.adafruit.com/product/1095#tutorials and http://www.adafruit.com/product/1096#tutorials that with a raspberry pi.
say i wanted to turn on an led with them what would the wiring and the code look like

Keyfob 4-Button RF Remote Control - 315MHz

This 4-button keyfob remote goes with our three basic 315MHz RF receiver modules. It will work with all of them, sending out one of four commands that match up with the four outputs. Its ...

Simple RF M4 Receiver - 315MHz Momentary Type

These Simple RF receivers are the easiest way possible to add wireless control, painlessly! There's no programming, configuring or addressing - simply power the receiver with ~5 VDC and ...

west sierra
#

Then take a look at that article and it should get you in the right direction. Have you used Python before?

#

You can wire D0 through D3 on the receiver to basically any free digital pins on the Raspberry Pi.

thin wraith
west sierra
west sierra
thin wraith
#

alright, ill make sure to check it out later

#

thanks

west sierra
# thin wraith thanks

any time... using something like poetry prevents a bunch of crap installed globally that might conflict with other things you write/run later on

turbid rivet
#

You can also use the onboard Python with a simple GPIO library like gpiozero for something simple like this. https://projects.raspberrypi.org/en/projects/physical-computing/0 provides a good overview, and the only difference between this receiver's code and the button code would be adding a false argument after the pin number when you declare a Button().

vague bear
#

Hi Everyone - I've exhausted my stack-overflow search abilities. I'm a mac user so I've become accustomed to using defaults read and defaults write to store non-secure variables for scripts. Is there a way to do this in on rpi?

steady rose
#

scripts written in what?

frosty kernel
#

I want to use a I2S module with my Adafruit Feather RP2040 but in the exemple that i saw, the GPIO18 is used but on the Feather it's used already used by a neopixel

steady rose
#

@frosty kernel is that a circuitpython question?

frosty kernel
steady rose
#

oh...you did. nvm.

vague bear
steady rose
#

i think that defaults thing might be macos specific?

vague bear
#

ok. That's what I thought.

steady rose
#

and is for saving application configuration settings?

#

is that what you're trying to do? or is it some other variables?

vague bear
#

Yes. for app config - Open to suggestions 🙂

steady rose
#

sry. i don't have any. but that sort of thing tends to be OS specific.

#

if it's environment variables, there's os.environ

vague bear
#

Thanks @steady rose I appreciate the confirmation / info

steady rose
#

and also get/putenv (same page)

grim geyser
#

Hey all

So I am in search of someone who knows Python

I have a CubeSat project on right now, and for that I require a person of this skill

If you know ANYONE such, pleaseeeee do inform me as soon as possible.

hardy plaza
#

In other words, just ask what you actually need help with.

wraith grove
# 
print('Python.')
grim geyser
#

So basically I want someone to help me out with Raspberry Coding of my educational CubeSat project, which I plan to sell

ripe berry
#

I’ve had a good experience with Fiverr. You might find someone there if no luck here.

ruby night
grim geyser
#

Okay sure

#

Thanks all

umbral sable
civic rune
#

Can anyone think of a valid, non silly, reason to do pi -> HDMI ->TV -> AUX -> Stereo for sound? The TV that was working died and the only spare we have is an ancient, out of support Sanyo model. I want to try to just do pi -> AUX -> stereo

steady rose
#

not sure what your end goal is?

#

need more info. is there a video w/audio source coming from the Pi over HDMI?

turbid rivet
steady rose
#

the new TV doesn't have HDMI?

turbid rivet
#

@civic rune You just need a Pi to send audio and video to an RCA output, yes?

civic rune
#

Sorry I've been out of cell range.

#

Goal is to send audio to a stereo. The existing setup seems convoluted.

#

The TV is because they didn't put a shutdown button on the pi enclosure so (for now) you have to use keyboard/mouse/TV to shut down

steady rose
#

there is no video involved? only audio?

civic rune
#

Video is involved, see above

#

But only because of bad design. The program itself doesn't output video

steady rose
#

the replacement sanyo tv does not have HDMI?

civic rune
#

It does

#

I just can't figure out how to make the audio exit thru the auc jack and sanyo no longer supports this model

#

Getting a new TV is not a near term option

steady rose
#

there's no audio out on the sanyo?

civic rune
#

There is but plugging into it does nothing

#

And I've been thru the whole menu and no settings seem to exist

steady rose
#

is the audio out an RCA connector?

civic rune
#

Yeah

#

Oh oops misread

#

There are both RCA and headphone AUX ports

steady rose
#

you can hear audio on the TV's built in speaker, but nothing on the audio out ports?

civic rune
#

Exactly.

steady rose
#

weird. seems like either the TV's broken, or those ports aren't what you think they are

civic rune
#

It says "AUDIO" next to the port and the manual implies that it should just work. I'm gonna see if there's some reason why they didn't connect to the aux port on the pi directly

steady rose
#

if you can figure out the audio out on the TV, no need to use the TRRS port on the pi

#

there's audio on hdmi

#

tv should just pass it on

#

should be two RCA connectors on the TV audio out. for L/R chan.

#

there may be some config needed on the pi? to set audio over hdmi? not sure. that'd just be a raspiconfig thing.

#

but if you hearing stuff on TV speakers, then should be set

civic rune
#

I don't think I can figure out the TV in time. I have just over 2 hours

#

Yeah I think default is audio over HDMI IME atleast

steady rose
#

a headphone port might cut out sound in weird ways too when used. like turn off the TV's speakers so just headphone audio is in use.

civic rune
#

I'm not sure that that's a setting that exists on this TV

#

I've had no issues with TRRS in my pi design

#

Are there models of the pi that don't have a TRRS?

steady rose
#

only the zero's afaik

civic rune
#

It's possible that the TRRS is just not accessible on this build which is also bad design

#

It's bolted/wedged into the enclosure such that there is a side I can't access

steady rose
#

you could do audio out over USB?

civic rune
#

I don't think I have time for that. I might just have time to go to a Best Buy

steady rose
#

do you know the sanyo model number? most tv's have audio pass thru.

civic rune
#

Yup the way they enclosed it makes the audio jack inaccessible

#

Yeah one sec

turbid rivet
#

RIP

civic rune
#

Yeah it's covered by a big block of wood. Apparently a PhD did this.

#

This travesty

#

Electrically it's way more complex than needed and shutting it down is harder than it needs to be.

#

@steady rose model number DP26640

steady rose
#

looks like that?

unknown.png
civic rune
#

Yup

#

Bane of my existence

steady rose
civic rune
#

What about the audio port?

#

Let me see if the amplifier we're using has RCA

steady rose
#

everything else is input

civic rune
#

Ahhhh

#

I just assumed it worked like the other TV. Ok I'll try to find a cable

steady rose
#

that's for a computer. VGA + audio

unknown.png
#

maybe...why is there that arrow from the upper HDMI input 1?

#

oh. for that.

unknown.png
#

yah. it's an input

civic rune
#

Ahh ok. Weird. I know nothing about TVs tho. Ok I'll probably have to drive an hour out of my way to gosh darn best buy

#

Thanks so much for your help @steady rose

#

Oh one more thing, am I looking for a cable that goes from one plug to two like this?

20211216_144207.jpg
steady rose
#

i think you'll need more than just a cable

#

the single coax digital is different than the two coax analog

#

is that a photo of the receiver you're needing to use? to route the tv audio to?

civic rune
#

Yup its a stereo amplifier

#

It's been 15+ years since I set up a TV with analog out so I don't know a thing.

steady rose
#

look for an input on the back of the receiver that's similar to tv

#

a single RCA labeled "digital" or "coax"

turbid rivet
#

Or S/PDIF

civic rune
#

Here's what I've got to work with

20211216_144742.jpg
steady rose
#

😦

turbid rivet
#

Ooof, the stereo's older than the TV.

civic rune
#

Yeah everything is ancient

turbid rivet
#

You'll need a DAC to convert the S/PDIF digital audio to an analog RCA.

steady rose
#

^^ yep

civic rune
#

Oh my gosh

turbid rivet
civic rune
#

So we're in trouble.

turbid rivet
#

Yes.

#

I hope you can at least get an HDMI portable monitor or something quickly...

civic rune
#

Well the spare TV works for video and I guess we can just have bad audio for now

#

Or I could buy a new stereo.

steady rose
#

you'd route TV coax to input (2) and then connect red/white coax to input on receiver

unknown.png
#

pi audio jack is covered?
and no time to attempt USB audio?

civic rune
#

I'd need another component for that no?

steady rose
#

for USB audio, yes

turbid rivet
#

USB DAC could at least bypass the TV

civic rune
#

We have 2 more hours til go time. I'll talk to our audio guy and see if he has another stereo. It needs digital input right?

turbid rivet
#

But otherwise, still a separate purchase I'm afraid.

#

For that TV, yes.

steady rose
#

yah. 2 hours is not enough time.

#

could bodge wires directly to pi board to access TRRS signals?

#

but that'd be an act of desperation with slim chance of success

#

show the audio guy the image from the manual that has all TV's back connections

#

there are also ways of streaming audio over network....but also not feasible with time constraint. and would need other items as well (like a second pi)

civic rune
#

Yeah we have a second pi but no wifi in the area.

#

Is there a way to write a quick and dirty script that might keep the screen from falling asleep?

steady rose
#

should be able to do that somewhere in pi desktop software

civic rune
novel mist
#

Hey there!
Is there a way rotate usb touch sourface on raspberry? I am using an usb touch screen.

west sierra
novel mist
#

It is rotated 90 degrees

west sierra
#

what model is the screen?

novel mist
#

To rotate the display it was easy, but i dont know how to rotate the hdmi input

west sierra
#

Oh

#

You are in Raspberry Pi OS?

novel mist
#

Well it is hard to tell 😄

west sierra
#

got it!

novel mist
#

Yes I am on raspberry os

west sierra
#

OK, so you can definitely rotate that. Can you make that window larger? If I remember correctly there should be a button there to rotate... Unless I am confusing it.

#

OK, so wait a second, are you supposed to have the screen standing up like that?

#

If so, then everything is right, and the output there is showing that the screen is rotated.

novel mist
#

Yes. The screen is rotated. That is okay. The touch input is not working

west sierra
#

Oh, touch is not translated when the screen is rotated?

novel mist
west sierra
#

I think for that you need to know the model/chip of the screen so that you can properly send the right commands.

novel mist
#

This video explans it i think

west sierra
#

yup, it hasn't translated the touch coordinates when the screen rotated

novel mist
#

Yes! That is my issue!:)

west sierra
#

OK, so can you provide the product name and model number of the display?

novel mist
#

Nope I have no idea about that

#

Is there a way to find it out?

west sierra
west sierra
novel mist
#

China.

west sierra
#

OK, so try this:

# 
dmesg | grep -i ft5406
#

what does that give you?

#

(you may have to run that as sudo)

novel mist
#

That do nothing

west sierra
# novel mist That do nothing

so that's not the driver then, can you look at the back of the display, maybe there's a label there that says the brand of the device, and hopefully a model number?

#

We basically have to know what the driver is in order to correctly rotate, I think?

turbid rivet
novel mist
#

Something made by asus

novel mist
turbid rivet
#

Nope, no datasheet for that guy. Time to rotate in software.