Never tried this. I'd suggest looking at a supplier like Digikey and seeing what precision of resistors you can afford (1% are the best, by memory).
Then do some calculations and see how much your values can drift, up and down.
Robert
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Re: another way to get a keyboard matrix to work off 1 adc pin
Never tried this. I'd suggest looking at a supplier like Digikey and seeing what precision of resistors you can afford (1% are the best, by memory).
Then do some calculations and see how much your values can drift, up and down.
Robert
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