1-wire sensors lost after some time
1-wire sensors are lost after some time of usage.
for example the recorded data (via node-red to influxdb):
i tried to reboot via ssh (M203 Module), this doesn't help (after the last points near 07:45).
There is no issue in the file systems with the used MicroSD card (SanDisk Extreme Pro)
the evok webinterface shows N/A for the defined sensors in the evok.cfg
For cabling i use a 2x2x0,8 EIB cable. Cable length are different to the sensors (in a range of 5-15 meters)
later i'll take pictures of the wiring points to ensure all things are ok.
( I think there is some issue in the 1-wire port or evok )
One DS18B20 is faulty. To discover this one sensor was not easy.
Therefore, I have each data line of the sensors (heating) individually connected to the bus and then tested the 1-wire bus. (if the heating sensor data wires are disconnected, the other 2 sensors are transmitting values)
At no time did I disconnect GND and + 5V to a sensor.
Unfortunately the simple connection of the sensor data ware was not sufficient, because EVOK did not deliver any new values.
Only a restart of the module could detect a functioning sensor / 1-wire bus within one minute.
Without restart, the value comes in felt 5-10 minutes, if the bus works well ...
6 sensor wires in one clamp, the faulty was there.
The sensor wires are drilled together and then put in the WAGO clamp.
Martin Kudláček last edited by
it is hard to see from the picture, but it looks like your sensors are connected in star topology. This is highly unrecommended and you can read more about it here: https://www.maximintegrated.com/en/app-notes/index.mvp/id/148