1. GUIDED BY :SUMAN SWAMI
PREPARED BY :SUCHITRA [10EEBEC081]
SUMAN SIDH [10EEBEC083]

2. 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.

3. COMPONENTS
1) LM35(TEMPERATURE SENSOR)

4. 2) ATMEGA32 micro-controller unit
A micro-controller contains (in one
chip) the following elements :
1) Instruction set
2) RAM
3) ROM, PROM or EPROM
4) I/O ports
5) Clock generator
6) Reset function
7) Watching timer
8) Serial port
9) Interrupts
10)Timers
11)Analog-to-Digital converters
12)Digital-to-Analog converters

5. 3) Brushless variable speed DC Motor [DR-6634-514]

6. 4) N-MOSFET (BUK9575-100A)

7. 5) Resistors (10k ohm, 1k ohm)
6) LM7805 Voltage regulator IC
8) Breadboard
7) Diodes(1N914)
9) Capacitors(0.1 ) & Red LED

8. PULSE WIDTH MODULATION
The expression of duty cycle is determined by :
METHODOLOGY

9. Control Algorithm Flow Chart

10. 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

11. 
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Personal computers
Exhaust fans in large hotels
Washing machines
CD and DVD players