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olkal / HX711_ADC

Arduino library for the HX711 24-bit ADC for weight scales
MIT License
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Electrical interference issues when using 4 load cells? #65

Closed Edward-Sams closed 3 years ago

Edward-Sams commented 3 years ago

Hello World. I've been working on creating a simple scale using 4 load cells. I started with using just 1 load cell to make sure my wiring, connections and software were all correct. Everything is fine. When I scaled up the project to 4 load cells, I am getting a lot of drift in the value. I have tried twisting the wires which may have helped a little, but the problem persists. I have also noticed, just getting my hand near the scale (within 12 inches) the values drift must faster, and a much larger range. I believe I have some electrical interference. How do I solve for this?

My code, I am just using the HX711_ADC calibration software. Power source is a usb connected to my mac (same on I used for the single load cell test). I have tried soldering my wires directly to the microcontroller and using a dupont connector.

IMG_1604

olkal commented 3 years ago

Hi, sorry for late response. Unfortunately I don't understand what's cousing the problem, it seems to me you have already tried what I would normally have suggested. The loadcell signal is in the millivolt range so quite senitive to electrical noise, but I can't remember that I have seen any difference if I just move my hands up close...

Edward-Sams commented 3 years ago

Thanks. I think my issue is more the soldering connection on the hx711 and not the wires. I'm going to try a different style hx711 this weekend to see if that resolves my issue. As it works now, it works fine but if i move the setup at all, it will stop working correctly.

olkal commented 3 years ago

I’m closing this issue because it has been inactive for some time. Please reopen if you still encounter this issue with the latest version. Thank you!