Hi Friends, in this video I will show you how to make a simple AUTOMATIC LIGHT OnOff Circuit using LDR and Relay. This device turns lights on automatically when it's night, and off when it is daytime. It is a sensor light switch. The circuit of the switch works on light sense.br br You Need:br 1. MOSFET 2N7000br 2.LDRbr 3. 470k Resistorbr 4. 12V Relaybr 5.