Greetings.
I'm making beehive scales using Arduino mini pro 3.3v, sim800, hx711 and 100kg load cells.
Design is always the same, and the scales work fine. However this year in may I bought ten HX711 modules from eBay (the green ones, cheap) and they all have the same problem. They drift horribly. In a matter of minutes 10kg become 7Kgs, then 6, then 5 etc. If I remove HX711 module I bought this year, and put last years it works perfectly fine and I get good stable reading.
So, general conclusion is that I have the bad batch of modules, although they do not look exactly the same.
But my question is I fix them somehow ? I Googled and the advice is to connect e- to ground on the module itself (reference design requires it), and to replace 20K resistor with 10K variant to make it suitable for 3.3V. tried both things, the drift stays, only the level changes a bit.
Any more ideas ? I'm using bogde HX711 library, tried others and they all have the same problem more or less..
I'm not posting any code, the problem is apparent with bogde library calibration example...
