For a university project, I have to use this photodiode.
I've tried following two circuits for a photodiode that I found here on the site. How to Use SFH235 IR Photodiode Correctly?
However, the circuit on the right with the op-amplifier, we can only get it to output 0. And with the circuit on the left, i also find the output strange. With a regular lit room, it outputs 67-70, but it is exactly the same without any light, and with a bright light-source shining onto it, it outputs around 95. Does anyone have any suggestions as to what could be wrong?