Gpio pins — Your Destination for Single Board Computers

Utilizing UARTA as a serial port

craighaworth — Thu, 14 Apr 2022 12:36:10 +0000

Board: le Potato
OS: Rasbian headerless
I wish to use the 40 pin header Pin 8 (UART_A_TX) and 10 (UART_A_RX) for uart to uart coms with an ESP32 microcontroller board.
I have used lc_overlay to activate overlay uarta.
I had an expectation, that either one of the serial ports ttyS[0,1,2,3] would now be usable as a serialport, OR
that a serialport would appear in /dev similar to ttyAML0 but maybe ttyAML1.
Any advice on the proper approach to enabling a serial port over UART A would be appreciated.

How does one use PWM?

tristan — Thu, 13 Oct 2022 15:26:52 +0000

Hi,

Is there any guidance available on how to use PWM on GPIO for the AML-S905X-CC?

I had a look under /sys/class/pwm, but that directory appears empty, at least in Ubuntu 22.0.4 LTS.

Thanks!

Can't get IC2 to work with Ubuntu image of Libre board

jzpi — Sat, 20 Aug 2022 00:09:53 +0000

Using this LCD and the Ubuntu image for my Libre board I can't seem to communicate to it. I tried following a guide for doing it on a Pi with no luck. Is there a config I need to enable it with?

Epaper hat problems

Spudz — Tue, 05 Apr 2022 22:43:00 +0000

Hi everyone. Recently got a potato and an 2.13 inch epaper hat. I got the epaper files from waveshare and need some assistance. I do have a raspberry and use a piglow in it but the armbian os is new to me. So how would I get it working? The epaper hat has a plug with wires that one by one connect to the gpio pins.

How do I access gpio pins (H2+ version)?

Bicko — Fri, 03 Apr 2020 08:19:03 +0000

Hi, I really like my H2+ version of the ALL-H3-CC; it's been sitting on my network taking regular surveys and providing useful reports for a very long time. Now I want to use it for some hardware control, as I do with Raspberry Pi, and I'm struggling to find out how to do this.
In Raspbian on Raspberry Pi I use Gpiozero (https://gpiozero.readthedocs.io/en/stable/index.html) in Python. How would I go about this on the H2+?
I had been using Armbian and sometimes Ubuntu, but I cannot seem to get Gpiozero to work in either of those.
I thought Raspbian might be the way to go (downloaded from http://share.loverpi.com/board/libre-computer-project/libre-computer-board-all-h3-cc/image/raspbian/), but I'm a bit concerned that 'h5' appears in those filenames. I did try the latest from that server, but it did not work on my H2+ (led stayed red, no o/p on the screen).
So I'm looking for some pointers, please. Ideally Gpiozero, but that's not critical - using Python really is desirable, though.
Over to you, the experts.
Regards from the locked-down UK.
Mike.

Putting the Le Potato in a car

bman1296 — Sun, 22 Mar 2020 07:35:27 +0000

Hi,

I would like to put a 'Le Potato' board in my car. However, I do not want it to cycle with the ignition turning on and off - instead, I would like the board to control when it turns off (say, 24 hours after the engine being off), after detecting the ignition wire is low.

I understand completely how to do this with a raspberry pi - I use a switch to supply power to pull GLOBAL_EN to low and this trips the pi into rebooting. However, this does not exist on Le Potato. From what I have seen, when you sudo shutdown -H now, it reboots, and if you reboot it obviously reboots.

My question is if there is any functionality on the board to get it to power back up after having halted or some other means - any suggestions??

1wire Device

DOcean — Sun, 08 Dec 2019 13:55:38 +0000

Hello,

is it possible to use 1wire on La Frite?

Is it dead?

Alejandro — Sun, 25 Aug 2019 15:34:31 +0000

All started when I connected my Lafrite, it did not load normally. I disconnected it and tried again but nothing, is dead. Both LEDs turn on but beyond that I have nothing, I have no image on the monitor that is the one I have always used and discard with another TV, HDMI cable and another power source but nothing.
Update 1:
I have already verified and discarded the hdmi cable, the power adapter, likewise remove the Emmc.
Update 2:
I connected Lafrite through the USB port closest to the pins to the PC and it has detected it as "GX-Chip", I am looking for the driver and I have been able to install it with this app "Amlogic USB Burning Tool" and Windows detects it as "WorldCup Device". Beyond this point I don't know what I can really do because the Amlogic tool is to flash .img files and the firmware offered by LibreComputer for Lafrite are .bin
Thanks for any help you can give me

Resin 3d Printer with this Board

nmitchko — Tue, 30 Apr 2019 18:47:03 +0000

Hi all,

Has anyone used this board to power a 3d Resin printer? The open source NanoDLP software can run natively on a raspberry pi 3,3B but does not support 4k output on the RPI. I am looking for this board to replace the RPI because of the 4k support.

I will keep this discussion open as I venture into getting this board to power my DIY printer.

Nmitchko

Progress so far:

Frame nearly assembled
Ubuntu bionic installed
NanoDLP Installed as server, may have to use an arduino nano to act as a driver controller for now.
```
sudo apt-get -y install unzip
```

wget https://www.nanodlp.com/download/nanodlp.arm64.zip

```
unzip nanodlp.arm64.zip && cd nanodlp 
```
```
./run.sh
```

More to come when my display arrives from CHINA.

GPIO on Android?

mossball765 — Wed, 08 May 2019 19:22:36 +0000

Has anyone been able to access the gpio using android on the le potato?
I'm an android noobie, but I'm looking for a starting point to figure out how to add physical buttons to android via the gpio. Any information, pointers, or suggestions would be a huge help!

SPI Device Interface

HelloMyNameIsRob — Tue, 23 Oct 2018 06:11:34 +0000

Hey, I'm pretty new to thus stuff, so I appreciate any help I can get.

I'm trying to get the Le Potato to communicate to some Arduinos using a NRF24L01.
I think I should be able to interface using this RF24 library (https://github.com/nRF24/RF24), but trying the example results in: Unable to open SPI device: No such file or directory

It's looking for the device at /dev/spidev0.0, which doesn't exist.

I started out with the Ubuntu images from Libre Computing, and got frustrated.
So, I tried loading their Raspbian image and using the raspi-config to enable the SPI interface.
...still no luck (after verifying the /boot/config.txt contains dtparam=spi=on, and rebooting)

I took a look at some forum posts that reference device-tree overlays, but I'm really not sure what I'm doing with them.
This one never really seems to come to a usable conclusion:
https://forum.armbian.com/topic/6448-le-potato-gpio-pins-on-sys/
...maybe I just don't understand what they are talking about.

This one references a new linux source, and I'm not sure how to compile it for Le Potato, and that seems like a lot of effort unless I'm sure it will work:
https://github.com/libre-computer-project/libretech-overlays

Again, my goal is just to get this communicating through the NRF24L01 through the SPI interface.
I don't care which OS I use, as long as I can do that... and run a NodeJS server.
If anyone has had any amount of success with this board, I would love to hear how you got there.

Thank you in advance for your responses!

GPIO library support for Le Potato

dogbert2 — Mon, 12 Nov 2018 01:04:02 +0000

Are there any C or python libraries for GPIO access for the Le Potato, or does someone have some examples they can share on the list?

TFT Touch display & Android ?

DarioBocc — Mon, 08 Oct 2018 22:05:30 +0000

Hello, is possible to use GPIO pins to drive a TFT Touch display on android?
Thanks!

Gpio pins for solid state relay

brandonme — Fri, 05 Oct 2018 14:09:40 +0000

If I understand this correctly you don't have to import the gpio library In the script? I think I'll start out checking output with a multimeter first. Am I going about this the correct way? I see people use resistors but every wiring diagram I see doesn't show resistors used but this is a fused relay though. Sainsmart to be exact.