PWM Based DC Motor Speed Controller

Abstract

This project is developed to design MOSFET driver using Microcontroller PIC16F73. It consists of a key pad and microcontroller unit. The key pad consists of keys to increase and decrease the MOSFET switching. A DC motor is used to show the demo. If voltage is given to DC motor, the motor runs in a particular direction and if the polarities are reversed, the motor runs in opposite direction. This project uses a Pulse width modulation technique to control the operation of a DC motor. The main part of this project is microcontroller PIC 16F73. The microcontroller generates different PWM pulses. The user can change the pulses through key pad. According to the pulse generated, the microcontroller sends signal to the MOSFET driver section. The DC motor is energized through the driver section. The user can control the speed of the DC motor by the way of MOSFET. The microcontroller program is written in assembly language.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM