temp sensor every now and then giving null value

[pjottrr]

Hi all,

i'm a bit new to domoticz/ home automation, and mainly trying to figure some stuff out. I've started with the smart meter, some sensors and a few smart plugs.

What i use:
Domoticz on ubuntu running on an atom 330
Mosquito as mqtt broker ( on the same machine)
Tasmota on shelly s plugs and the firebeatles esp32 boards

I've figured out most of it, but i ran into a problem with a am2301 temperature / humidity sensor
Every so often the temperature reading is somehow corrupted and all values sent from the firebeatle as Mqtt result in Null values

normal message: 06:27:13.846 MQT: tele/tasmota_30F51C/SENSOR = {"Time":"2022-04-24T06:27:13","AM2301":{"Temperature":17.9,"Humidity":43.7,"DewPoint":5.3},"ESP32":{"Temperature":37.2},"TempUnit":"C"}

faulty message: 07:39:15.910 MQT: tele/tasmota_30F51C/SENSOR = {"Time":"2022-04-24T07:39:15","AM2301":{"Temperature":null,"Humidity":null,"DewPoint":null},"ESP32":{"Temperature":37.8},"TempUnit":"C"}

_______________________________________________


I've tried different pull up resistors, but that doesn't seem to make any difference, tried multiple different pins but it looks like it's a Tasmota problem that has to do with a timeout that is too short ( not 100% sure)

i could possibly fix it by changing one of the source files to have a longer timeout and then recompile Tasmota and use my own compiled version of Tasmota. However, that seems to be a lot of work, and replacing the sensor with a "decent one seems more logical.

but before i replace the sensor, i was wondering, is there a way to ignore all those null values in Domoticz?
I don't mind having not all the values but i do mind that the graph is all messed up : https://prnt.sc/BSpe_cSteMtX

So suggestions on how to get a decent graph are welcome
With kind regards,

Peter

[waltervl]

Perhaps you can do something with tasmota rules https://tasmota.github.io/docs/Rules/#rule-syntax to filter out illegal values.