UnravelTEC / Raspi-Driver-DS18B20

Driver for reading ds18b20 onwire temperature sensors and outputting in prometheus scrape format

DS18B20

Software to read out DS18B20 sensor values over onewire on Raspberry Pi.

This software is licenced under GPLv3 by UnravelTEC OG (https://unraveltec.com), 2019.

Prerequisites

You might need to run the following commands as root e.g. by typing sudo before running a specific command.

Enable onewire interface

add dtoverlay=w1-gpio,gpiopin=4 to /boot/config.txt

Note: Standard pin is 4 - argument may be omitted then.

Wiring DS18B20 to Raspberry Pi

• DS18B20: Signal -> Pi: pin 4 (or else) - and add a pullup resistor (e.g. 10K) between this pin and 3v3, or else it wont work!
• DS18B20: VIN -> Pi: 3.3V (or any other gpio configured output,HIGH)
• DS18B20: GND -> Pi: GND (use one of GND pinouts)

installing as a service

./install.sh

Two different drivers:

• the (newer) python service publishes sensor data to local mqtt broker under the topic $hostname/sensors/DS18B20/temperature
• the (older) shellscript service writes a file /run/sensors/ds18b20/last and updates it every second (which resides in RAM) - it is meant to be read out by prometheus.