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Published on Aug 21, 2023


This project is developed for the users to control the operation of any home appliances. In modern world, Man has no time to wait for a particular appliance to on for a particular period. The appliance can be on and off under this control.

It mainly consists of a key pad, microcontroller unit, drivers and relays and LCD display

The user can set any of the time given in the timer switch using key pad. The settings are stored in the microcontroller. The details are displayed in the LCD display.

The timer switch controls the appliance to run for the particular period. If the particular period is over, the timer switch automatically makes the appliance off.

The program is written in Assembly language. Then it is converted in to Hex code. The Hex code is then written into a particular micro controller(PIC). The micro controller IC will control the entire circuit.

The microcontroller used is PIC 16F73. The microcontroller program is written in assembly language.

Working Principle:

The Main module in this project is microcontroller. The microcontroller has inbuilt RAM. The microcontroller program is written for Clock and switching operations. The user can set the time and duration using the key pad.

The values stored by the user are stored in the RAM of the Microcontroller. When the particular time reaches, the microcontroller sends signal to the driver section and thereby operates the particular relay.

Thus the particular device will be switched on. The microcontroller also checks the end time. When the time reaches, the microcontroller switches off the device. The details will be displayed in LCD display

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