DC Motor Speed Controller Using Cellular Phone

Abstract

This project is developed for the users to monitor and control the operation of a DC motor through Telephone. There are two units. One in the office and the other in the user area. In the Office, a microcontroller kit is connected with a DTMF encoder. A PC is connected with the microcontroller kit through serial port. In the user area, a microcontroller kit is connected with a telephone line and LCD display. The microcontroller kit in the Office operates the telephone to call the user line. The user kit attends the call and according to the speed of the DC motor, the microcontroller sends signal through the telephone. In the other side, the telephone line receives the signal through a DTMF encoder; the signal is converted to digital signal and given to the microcontroller. According to the signal, the microcontroller sends signal to the PC through serial port to display the meter reading in the user area. Also the administrator can control the speed through telephone line by sending proper code. Thus the speed is sensed and are currently monitored and controlled in the office. It uses PIC16F73 (28 pin Micro controller). The micro controller program is written in assembly language.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM