1W temperature sensor
You can connect one wire (1W) DS18B20 sensors to OpenPlotter. This sensor is waterproof and can withstand high temperatures. Connecting multiple DS18B20 in parallel to the same pins, you will be able to get temperature data from coolant engine, exhaust, engine room, fridge, sea ...
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Pins names are according to the diagram below.
You have to connect these sensors to GPIO4 (aka GCLK), GND and 3.3V pins. Some sensors may have a fourth wire which do not need to be connected. You need to use a pull-up resistor as shown in the image below. You can connect multiple sensors in paralel using just one resistor.
If you want to change the GPIO pin, edit the file config.txt typing in a terminal:
sudo nano /boot/config.txt
At the end of the file you should see a line like this
replace it by
where x is your desired GPIO pin. Save and reset.
See 1W chapter to configure DS18B20 sensors.