Hi,
I am working on photocurrent amplifier circuit. When I supply power to OPAMP from Arudino using digital pins directly to OPAMP, the A0 is stable. (when dark A0 is 0V, when bright A0 is > 0V)
However, if I supply power from programmable DC power source, the A0 signal swings from high to low, low to high.
I though the baud rate etc is an issue, but changing the baud rate () did not solve the issue.
I don't know how to help but the project is interesting
Most likely, either the op amp is oscillating (increase Cf), or you forgot to make a common ground connection between the programmable power source, the op and and the Arduino, so the input is floating.
The LM358 is a dual op amp. Do you have the other inputs connected and not floating where they may cause oscillation?
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