Troubleshooting an HX711 IC in a digital scale

Thread Starter

Yami

Joined Jan 18, 2016
338
Hi, I've got couple of Acaia digital scales used by baristas. The person who brought in the last one said that the measurements were off and I also noticed that the numbers were jumpy too. Anyway the manufacture states that its almost always the load cell which is effected. I tried swapping the controller board with another scale which had a good load cell. It didn't work probably the controller is calibrated in such a way that its supposed to be used with the load cell it came with.
Anyway going to my question - I was wondering whether it was possible to troubleshoot an HX711 IC. I could get access to an oscilloscope in college. Maybe check the serial outputs?

Thanks for the help
 

sghioto

Joined Dec 31, 2017
2,276
I was wondering whether it was possible to troubleshoot an HX711 IC.
First I would check that the supply voltage is stable.
Check that you have voltage across the load cell.
Check the voltage at the +INA and -INA inputs. With no load on the scale the voltages should be the same or pretty close.
SG
 
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