Automatic On Off Delay Switch is a programmable switch which is used to on and off the machinery and appliances in a desired time. This project is based on electronic timer, which can be programmed using lcd interface and keypad. The main advantage of this project is that appliances or machinery can be switched on or off after a fixed time without any human interface.
In this project we are using a microcontroller (Atmega8/328) which have internal timer, A LCD is also attached with microcontroller for used interface. The circuit is programmmed by using keypad and potentiometer.