1-wire sensor not listed in /w1/devices/ -wrong plug occupancy?

bibabutzemann

Hello everybody,

I started from scratch and configured everything that should be configured, but I still don't see the 1wire sensor under /sys/bus/w1/devices.
I suspect that my RJ-45 connector is incorrectly connected. My sensor is a DS18B20 with 3 cables (red, black, yellow).
How do these cables have to be connected in the RJ-45?

Many thanks in advance
-Luk

Martin Kudláček

Hello @bibabutzemann,
the 1-Wire pinout on our PLCs is documented here: https://kb.unipi.technology/en:automation:02-glossary:1wire-hidden

Since your sensor is not original from UniPi (we have 4 wires), I can only guess the function of the wires:

red: Vcc
black: GND
yellow: 1-Wire

But you need to refer to the documentation of your sensor, or do the blind test which may damage your sensor.

Best regards,
Martin