Connect to DS18D20 sensor

[angus]

HI and welcome.

Looking at the datasheet for your sensor, it looks like it uses 1-Wire. You will need to apply a Device Tree Overlay, there appears to be one called “w1-gpio” for 1-wire that should enable that communication protocol on ‘gpio “4” (BCM)’ according to the comment in the overlay. I ran lgpio bcm 4 and that spit out info for GPIOCLK_0, which is physical pin 7.

I have no idea how to read from it after that, I’ve never used 1-Wire myself.

Here’s some info on GPIO and Device Tree Overlays for the tater, hope it gets you started off in the right direction:

Libre Computer Wiring Tool

To install via apt: sudo apt update sudo apt install libretech-gpio libretech-dtoverlay libretech-gpio To get a list of headers for your board: lgpio headers To get a list of the header pins for a header: lgpio header HEADER For getting the information for a pin number on the main GPIO header of the board: lgpio info PIN# For getting the information for a pin number on a specific header of the board: lgpio info HEADER PIN# For getting the libgpiod chip and line number for a pin on th…

AML-S905X-CC (Le Potato) Overview Resources and Guides

Get a good power supply > 5.0V < 5.5V Get a good MicroSD card If not, you’re going to waste a lot of time. Boot Boot Sequence General Troubleshooting Board Specific Troubleshooting Debug UART Shutdown GPIO Header GPIO and Hardware Overlay Control Pinout / Pinmux Map Python 3 Binding I2C SPI PWM and Fan Control UART with 921600 Baud Rate SDIO WiFi SARADC Other Overlays I2S - please request if needed PCM - please request if needed SPDIF Board Hardware LEDs Serial Number Temperature/Therm…

GPIO Pinout Header Maps and Wiring Tool for Libre Computer Boards

Below are links to spreadsheets with the GPIO and its pinmuxes. These are derived from the board schematics. ALL-H3-CC AML-S805X-AC AML-S905X-CC AML-S905X-CC-V2 identical to AML-S905X-CC AML-S905D-PC AML-S905D3-CC AML-A311D-CC ROC-RK3328-CC ROC-RK3328-CC-V2 identical to ROC-RK3328-CC ROC-RK3399-PC ROC-RK3399-PC-V1.2 Also see Libre Computer Wiring Tool and Libre Computer Pinmux Compatibility Matrix.

EDIT: Two other things I’d note if you’re new to this SBC:

1. Watch your heat: Le Potato - Long Term Process Heat
2. Your’re better off using generic Linux guides. Raspberry pi stuff tends to be pretty specific to broadcom chips, where as the folks at Libre Computer try to do everything the upstream Linux way (Which is awesome, since I daily drive Ubuntu Studio).