Temperature Based Fan Speed Controller Using PWM Technique

Abstract

This project is developed for the users to control the speed of a fan according to the temperature in the room using PWM technique. The heart of the circuit is microcontroller PIC16F73. The microcontroller has three ports that can be used for Input and output. The signal from a temperature sensor is given as input to pin no. RB0 of the microcontroller. The output is derived at RB6 and RB7 of the microcontroller. According to the temperature variation, the microcontroller sends PWM pulse to the output pins. This PWM pulse is given to the driver section and the driver section operates the fan motor. According to the variation in PWM pulse, the speed of the fan motor will be set. Thus according to the temperature variation, the speed of the fan will be adjusted automatically. Thus the room can be kept at constant temperature. Since microcontroller is used in this project, the operations are very accurate.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM