ATMEGA16 Microcontroller with 16x2 LCD & 5V Relay
ATMEGA16 Microcontroller is used as brain of this whole circuit / system.
5V Relay is used to isolate ATMEGA16 Microcontroller as well as whole DC circuit form 220V AC circuit.
Liquid Crystal Display is used for showing Relay's condition.
Switch is used for ON/OFF Relay as well as 220 V LED Bulb / Lamp.