how fan is controled on current temperature

1. BACHELOR OF TECHNOLOGY
IN
EIECTRICALAND ELECTRONIC ENGINEERING
A
MINI PROJECT REPORT
ON
TEMPERATURE BASED FAN SPEED CONTROL
& MONITOR
UNDER THE GUIDANCE OF Presented By,
Mrs. V. SUPRITHA P. KRISHNA SAI (18285A0228)
Asst. Professor M. AKHILA (17281A0245)
G. VIVEK (18285A0231)

2. OBJECTIVE OF PROJECT
 Measure the room temperature
 Display the current temperature in the LCD
 Vary the speed of fan accordingly
 Reducing the power consumption

3. CONTENTS:
 INTRODUCTION
 BLOCK DIAGRAM
 HARDWARE EQUIPMENTS
 ARDUINO UNO
 TEMPERATURE SENSOR LM35
 LCD 16X2 DISPLAY
 DC MOTOR
 CIRCUIT DIAGRAM
 CIRCUIT DISCRIPTION
 APPLICATIONS
 ADVANTAGES
 FUTURE SCOPE
 CONCLUTION

4. INTRODUCTION
 A simple introduction about the temperature controller
circuit.
 This circuit project is mainly used for indicating
temperature , controlling temperature.
 Microprocessor forms the processing part.
 In temperature controller circuit, there are two parts
consisting of LM 35 interface with ARDUINO UNO. LCD
interface with ARDUINO.
 The hardware circuit of temperature controller need
the programming

5. BLOCK DIAGRAM

6. HARD WARE EQUIPMENTS
 Arduino UNO
 Temperature Sensor LM 35
 LCD Display LED 16 X 2 Display
 DC Motor 9V
 Battery 9V
 Resistor
 Potentiometer
 Capacitor
 Transistor
 Diode

7. ARDUINO UNO
 The Arduino Uno is a microcontroller
board based on the ATmega328
(datasheet).
 It has 14 digital input/output pins (of
which 6 can be used as PWM outputs), 6
analog inputs, a 16 MHz crystal
oscillator, a USB connection, a power
jack, an ICSP header, and a reset
button.

8. TEMPERATURE SENSOR(LM35)
 The LM35 series are precision integrated-
circuit temperature sensors, whose output
voltage is linearly proportional to the
Celsius (Centigrade) temperature.
 The LM35 does not require any external
calibration or trimming to provide typical
accuracies of ±1⁄4˚Cat room temperature.

9. LCD DISPLAY 16 X 2
 LCD (Liquid Crystal Display) screen is an electronic display module
and find a wide range of applications.
 A 16x2 LCD display is very basic module and is very commonly used
in various devices and circuits.
 A 16x2 LCD means it can display 16 characters per line and there
are 2 such lines.
 Two registers in use:- command register and data register

10. DC- MOTOR
 A DC motor is an electric motor that runs on direct current
(DC) electricity. In any electric motor, operation is based on
simple electromagnetism.
 A simple 2-pole DC electric motor (here red represents a
magnet or winding with a "North" polarization, while blue
represents a magnet or winding with a "South" polarization).

11. CIRCUIT DIAGRAM

12. CIRCUIT DESCRIPTION
 As we have a look into the circuit diagram, we have
seen that the 16x2 LCD panel indicates the output result
to show. The 1k potentiometer is connected to the 3 no
pin of that LCD panel to control the intensity of
brightness.
 The main portion of the LCD panel is connected to the
Arduino Board with pin 2,3,4,5,6 and 7 of UNO. The pin
8 of Arduino is connected to the LED indicator to
indicate the peak level of temperature and fan speed

13.  The pin 11 is connected to the capacitor which controls the fan speed
intensity. The capacitor discharges through the transistor BD139. The
transistor get biased through this capacitor and then controls the fan
speed. The diode IN4007 acts as a switch to stop the fan below a certain
cut-off level.
 The temperature input is given to the pin A0 of Arduino from pin 2 of
LM35.
Contd..

14. APPLICATION
 Personal computers
 Exhaust fans in large hotels
 Washing machines
 CD and DVD players
 The circuit can be used for Car Engine to reduce the heat.
 This project can be used in Home.
 This project can be used in Industry.
 This will help in saving the energy / electricity

15. ADVANTAGES
 It is very economical and easy to handle by the user.
 Speed varies automatically, so that it controls the speed
without using it manually.
 It is help full to disabled People.
 It is very easy to install in offices, houses etc.
 Save energy by slowing down its speed in low
temperature.

16. FUTURE SCOPE
 The project will concentrate on electric standing fan
rather than other type of fan such as ceiling fan.
 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

17. CONCLUSION
This paper elaborates the design and construction of fan
speed control system to control the room temperature.
The temperature sensor was carefully chosen to gauge
the room temperature. Moreover, the fan speed will
increase automatically if the temperature room is
increased. As conclusion, the system which designed in
this work was perform very well, for any temperature
change and can be classified as automatic control.

18. Thank You