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Troubleshooting ADC Readings from Photodiode on Arduino

Posted by Aymen Ammari
3:36 am
21/11/2024

Hi everyone,

I am trying to rebuild a device and have wired everything according to the schematic:

You can see that the output pin of the photodiode (pin 5) is connected to the ADC pin A0 of the Arduino. By adjusting the potentiometer, I should of course get values between 0 – 1023 (10 bit ADC). However, no matter how I adjust the potentiometer, I always get 1023, so I think the sensor is “overshooting” all the time. I have tested the potentiometer previously and it works fine. I suspect there is something wrong with the wiring diagram.

Any ideas? Thanks in advance.