Analog Reference

I'm reading from a variable-voltage load cell. The change in voltage is around 4 mV. It has four wires: Excitation ground, Excitation positive, Signal negative, and Signal positive. When applying 10 volts across Excitation ground and positive, the voltage across the Signal negative and positive is around 4.3VDC. I would like to use the Signal negative pin as an analog reference, then measure the voltage to Signal positive. On the documents (, I see AREF on the ribbon cable, but it doesn't appear to be available on the board. How do I use a "custom" analog reference?

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Asked on 6/14/21, 4:57 PM

I tried to write this comment before, but I don't see it so I'll try again. After further research, it looks like I can't rely on the onboard ADC to be able to read this signal. I'll open a new question about communicating with a separate module for reading load cells.

on 6/14/21, 8:37 PM

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Asked: 6/14/21, 4:57 PM
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Last updated: 6/14/21, 8:37 PM