DTMF Based Industrial Automation Appliance Control System

Abstract

This project is developed for the users to control Electric and Electronic devices through Cellphone. The user can control all the domestic appliances for example, Light, TV, Fan, Fridge etc. This tele remote circuit which enables switching on and off of appliances through cellphone. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls. The circuit can be used to switch up to nine appliances (corresponding to the digits 1 through 9 of the telephone key-pad). The DTMF signals on telephone instrument are used as control signals. The digit ‘0’ in DTMF mode is used to toggle between the appliance mode and normal telephone operation mode. Thus the telephone can be used to switch on or switch off the appliances also while being used for normal conversation. The circuit uses IC 8870 (DTMF to BCD converter), PIC16F73 Microcontroller (4 to 16 line demultiplexer). The overall operation of this circuit is controlled by the Microcontroller (Programmed for demultiplexer). The microcontroller program is written in assembly language.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM