Photoresistor
- ArduinoArduino - step by step An automatic light like a fridge light: push button, NPN transistor and LDR, then an Arduino that reads the light on A0 and dims an LED with PWM.
- InfoPhotoresistor A photoresistor (LDR) changes its resistance with light: how much, the voltage divider for an Arduino, choosing the resistor and a night-light program.