I’m using HX711 adc module with arduino and 200 kg loadcell. It works well but when i powered off and wait next day the 50 kg weigth drifted 60 gr and 100 kg weight drifted 120 gr. when i wait 1-2 hour then powered on 50kg weight drifted 20 gr and 100 kg weight drifted 40 gr. What can be the reason and is there anything that i can compansate this drift.
Hi navy.
It’s not the HX711 that’s drifting, it’s your load cell that does that. All load cells will drift or “creep” when left under strain.
What you need to do is zero the scale then apply a know weight for several days and then calibrate to that weight.
If you search for “load cell creep” online, you should find a bunch of information explaining why this happens and different methods for accounting for it.