The light sensor is also called a light-dependent resistor (LDR) or photocell. It is connected to Arduino pin A0. analogRead measures the voltage at the pin. You will get a value between 0 and 1023 (where 0 equals ground and 1023 equals +5 volts). Changing the type of lamps and ambient light will give a bit of variation in your readings. In many cases … Continue reading "Light sensor, LDR"
