HI, Can anyone give me some help on how would i be able to read my sensor signal (positive to negative voltage) or program my arduino to directly read the values I get from my sensor? How can I input my sensor signal into the arduino to display my results? I plugged my OP-AMP Output directly to the…

pH Meter to Arduino to LCD help please.

Grumpy_Mike April 27, 2012, 7:33am 8

It could be you have some oscillation on the signal which will make the multimeter reading wrong. Have you looked at it on a scope?

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