TEMPERATURE BASED FAN SPEED CONTROLLER

Prepared by :

Supervisor :

CONTENTS

• Chapter 1: Introduction

• Chapter 2: Literature Review

• Chapter 3: Methodology

• Chapter 4: Result and Discussion

• Chapter 5: Conclusion and Recommendation

INTRODUCTIONCHAPTER ONE

temperature controlled fan is analternative way to deal with thespeed of the motor.

Temperature control is a process inwhich the temperature of an object ismeasured and the passage of heatenergy into or out of the object isadjusted to achieve a desiredtemperature.

Fig:1.1. temperature controlled fan

The idea behind this project is to control the speed of fan using microcontroller based on variation in temperature.

Objectives

Measure the room temperature

Display the current temperature in the LCD

Vary the speed of fan accordingly

Reducing the power consumption

INTRODUCTIONCHAPTER ONE

Literature Review

According to Tito Smailagich, given the highcost of electrical power, replacing aconventional on/off temperature control with aproportional controller can often save energyand money.

Lawrence Berkeley NationalLaboratory in their articles mentionedthat in the manufacturing sector, fansuse about 78.7 billion kilowatt-hoursof energy each year. Thisconsumption represents 15 percent ofthe electricity used by motors.

CHAPTER TWO

Fig:1.1. temperature controlled fan

Methodology

Block diagram

CHAPTER THREE

fig:3.1. temperature based fan speed controller

ThermistorHigh Gain Amplifier

Comparator

Bridge Rectifier

Triac Optocoupler

Increase in

temperature

AC supply

230 V, 50Hz

230 V

AC

Fig:3.1. TEMPERATURE BASED FAN SPEED CONTROLLER

Block diagram

Methodology

Flow Chart

CHAPTER THREE

Fig:3.1. Flow Chart of temperature based fan speed

controller

METHODOLOGYCHAPTER THREE

PRINCIPLE OF OPERATION OF TEMPERATURE BASED FAN SPEED CONTROLLER

It is rated to operate over a -55 degree to +150 degree Celsius temperature range. It has+10.0mV/Celsius linear scale factor. Theoutput of this sensor will be connected toATMEGA-32 Micro-controller ‘s PORT-A.

In this project we are using LM35 series analogtemperature sensor. This is a precision integratedcircuit, whose output voltage is linearlyproportional to the Celsius (Centigrade)temperature.

Fig:3.2. Operation of a Metal Detector

CIRCUIT DIAGRAM

METHODOLOGYCHAPTER THREE

Fig:3.2. Circuit diagram of a temperature based fan speed

controller

CIRCUIT DIAGRAM

METHODOLOGYCHAPTER THREE

Fig:3.2. Circuit diagram of a temperature based fan speed

controller

1. LM35(TEMPERATURE SENSOR)2. ATMEGA32 micro-controller unit3. Brushless variable speed DC Motor [DR-6634-514]4. N-MOSFET (BUK9575-100A)5. Resistors (10k ohm, 1k ohm)6. LM7805 Voltage regulator IC

COMPONENTS

METHODOLOGYCHAPTER THREE

MAJOR COMPONENTS

METHODOLOGYCHAPTER THREE

Fig:3.2. ATMEGA32 micro-

controller unit

Fig:3.2. LM35(TEMPERATURE SENSOR)

2.

Fig:3.2. N-MOSFET (BUK9575-100A)

Design and Construction

METHODOLOGYCHAPTER THREE

Result and discussion

After designing, simulating, assembling, soldering

and testing the circuit, we came to the conclusion

that our circuit of the temperature based fan speed

controller is working satisfactorily.

The construction hardware perfect.

The total project work perfectly and has negligible

amount of unexpected functioning.

CHAPTER FOUR

Results

APPLICATION

Personal computers

Exhaust fans in large hotels

Washing machines

CD and DVD players

Result and discussionCHAPTER FOUR

Disadvantages-(1) It can only be maintained by technical person .

(2) Due to temperature variation, after sometimes it’s efficiency

may be decreased .

Advantages and disadvantages

Result and discussionCHAPTER FOUR

Advantages-(1) Since it is an automated system ,it is programmed effectively so

that no interruptions would stop its functionality.

(2)To monitor the environment, that is not comfortable or possible

to monitor for humans(especially for extended periods of time)

(3) Prevents waste of energy.

Conclusion and Recommendation CHAPTER FIVE

The problem statement is implemented.

Hardware part is halfway implemented.

Through simulations and after running the code in IDE abstract is

verified

As the technology is going on developing day by day, we prefer

things to be done automatically and in the same way our projects

reduces the work to mankind.

Conclusion

Conclusion and Recommendation CHAPTER FIVE

• We can monitor more parameters like humidity, light and at the same

time control them.

•We can send this data to a remote location using mobile or internet.

We can draw graphs of variations in these parameters using computer.

•When temperature exceeds the limit, a call will be dialed to the

respective given number by an automatic Dialer system.

Recommendation

Thank you

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