I have 2 identical scales, both have the green HX711 and Bosche H30A.
I read, that the green HX711 boards do not have a connection between E- and GND (i checked that, my boards didn’t), so i connected them. As read, the connection is also good for stability reasons. This was already done before i figured out the temperature behaviour.
Yesterday evening i cleaned the soldering and I removed all flux. This was not really an improvement. See :
The other scale is way better. Here i have two temperature-sensors. One located in the box near the HX711 board, the other one is near the load cell. This configuration is working very good, more accuracy is not important for me. Unfortunately the temp-sensor failed during the night, so i don’t have temp measurements below 8°C, but the weight is very stable, seesecond link.
Now i should swap the electronic board and the load cell, to see whether the HX711 or the load cell itself is not working proper.
I am sure BOSCHE load cells are well designed and they have temperature compensation on board, but maybe the one i got is faulty? (At least the price and the data spec. should ensure that)
Any other ideas?