Light Dependent Resistor(LDR) with Arduino 

Circuit diagram-:

Download code-: https://drive.google.com/file/d/1doS43dtc_zmT739Hj6RxQErgszO9LRBa/view?usp=sharing

Light Dependent Resistor(LDR)

LDRs (light-dependent resistors) are used to detect light levels, for example, in automatic security lights. in the dark and at low light levels, the resistance of an LDR is high and little current can flow through it.In bright light, the resistance of an LDR is low and more current can flow through it.