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TEMPERATURE BASED SPEED CONTROL OF FAN
ELECTRONICS & COMMUNICATION PROJECT
GUIDED BY :-SUMAN SWAMI
PREPARED BY :-SUCHITRA [10EEBEC081]SUMAN SIDH [10EEBEC083]
INTRODUCTION
In this project we are using LM35 series analog temperature sensor. This is a precision integrated circuit, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. It is rated to operate over a -55 degree to + 150 degree Celsius temperature range. It has +10.0mV/Celsius linear scale factor. The output of this sensor will be connected to ATMEGA-32 Micro-controller ‘s PORT-A. The inbuilt ADC in ATMEGA is used for converting into Digital format. That will be used by ATMEGA to generate control logic. Then the PWM output from ATMEGA micro-controller is given to variable speed DC motor through a motor driver stage.
COMPONENTS
1) LM35(TEMPERATURE SENSOR)
2) ATMEGA32 micro-controller unit
A micro-controller contains (in one chip) the following elements :1) Instruction set2) RAM3) ROM, PROM or EPROM4) I/O ports5) Clock generator6) Reset function7) Watching timer8) Serial port9) Interrupts10)Timers11)Analog-to-Digital converters12)Digital-to-Analog converters
3) Brushless variable speed DC Motor [DR-6634-514]
4) N-MOSFET (BUK9575-100A)
5) Resistors (10k ohm, 1k ohm)
6) LM7805 Voltage regulator IC
7) Diodes(1N914)
8) Breadboard
9) Capacitors(0.1 ) & Red LED
PULSE WIDTH MODULATION
The expression of duty cycle is determined by :
METHODOLOGY
Control Algorithm Flow Chart
Hardware Implementation
Block Diagram
Software Implementation
Main steps involved in the program: Initialization of the port A for analog input from sensor Initialization of LCD module foe displaying temperature Initialization of the PWM module Initialization of the TIMER 1
APPLICATION
Personal computers Exhaust fans in large hotels Washing machines CD and DVD players
THANK YOU