Hello everyone! I'm very new to electronics and I have a problem. I have a 5V source and 4 photodiodes (3mm) each linked to an analog port and to the gnd . When I hide only a photodiode, I read the same value on all the other 3 photodiodes. Instead, I'd like to treat them as if they were in "different circuits" is there a way I can accomplish this? Thanks!
(I have an Arduino UNO)