Photocell dropping resistor size for photocell input to a Arduino UNO Answered
I purchased an Arduino UNO. The plan is to use a photocell
as and input to energize a relay as an output. The photocell I have has a value of 2.3K ohms when it sees light and 30K ohms when dark.
What value dropping resistor should I put in series with this photocell across 5 volts dc to gnd?