I am a software engineer and I don't have much experience with analog electronics.
I am doing a project of weight measurement using HX711 weighing sensor.
This is a rough schematic of my circuit:
I am trying to measure various weights. As I increase the load cell capacity the fluctuations seem to increase as well. For load cells of 1 ton and more the fluctions increase tremendously.
I have interfaced the HX711 with a Raspberry Pi using this library Tatobari-hx711.
I tried averaging that is given in this library. That doesn't seem to work.
I also read that the rxcitation voltage to the load cell through the HX711 is noisy so I am powering the load cell from the SMPS itself.
- Is there a simple way to reduce fluctions? What can I try?
- What can be done in software to reduce noise?
- If the output of load cells is same (0-20mv) why does this issue arise? Is it due to the multiplication factor? Lower range load cells work fine. Is it due to stable first bits of the ADC output?
- I read somewhere that the fluctuations can be reduced using some hardware peripherals like resistors. How does that work?