Our object of making this project is for reducing the power consumption. And also to assist people who are disabled and are unable to control the speed of fan.

1. Project Associates :
JAGANNATH DUTTA (Roll No. 28100314029)
SUMAN MUKHERJEE (Roll No. 28100314059)
SUBHAM GHOSH (Roll No. 28100314049)
TEMPERATURE BASED FAN SPEED CONTROL &
MONITORING USING ARDUINO
Under the Supervision of
Mrs. D. RAY
Asst. Prof. in Dept. of E.C.E

2. OBJECTIVE OF PROJECT
Our object of making this project is for reducing the power
consumption. And also to assist people who are disabled and are
unable to control the speed of fan.
It may also be used for monitoring changes in environment.
In near future, it can also be used in different industries and
electronic devices.

3. CONTENTS:
INTRODUCTION
BLOCK DIAGRAM
PROGRAMMING
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 & FAN interface with ARDUINO UNO.
The hardware circuit of temperature controller need the
programming.

5. BLOCK DIAGRAM
FAN
(9V DC MOTOR)
LM35
A
R
D
U
I
N
O
UNO
LCD DISPLAY
(16X2)

6. PROGRAMMING

7. 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

8. 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.

9. 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.

10. 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.

11. 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 green represents a magnet or
winding with a "South"
polarization).

12. OTHERS COMPONENTS
1k Resistor 9V Battery
1K Potentiometer
capacitor-10uF
Diode-1N4007
Transistor-BD139
LED

13. CIRCUIT DIAGRAM

14. 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

15. The pin 11 is connected to the capacitor which controls the fan speed
intensity.
The capacitor discharges through the emitter of 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.
The diode is used to protect the inductive instability .
Contd..

16. Contd.
Voltage Equation of the DC Motor :
Input Voltage provided to the motor armature can
perform the following two tasks:
Obtain control on Back E.M.F Eb of the Motor.
Provide supply to the Ohmic IaRa drop.
V = Eb + IaRa ………………….(1)
Where
Eb = Back E.M.F
IaRa = Armature Current X Armature Resistance
This is called “Voltage Equation of the DC Motor”.

17. Contd.
Total torque developed of a DC machine is :
This torque equation of DC motor can be further
simplified as:

18. Contd.

19. Regulation of Speed by PWM
One simple and easy way to control the speed of a motor is to
regulate the amount of voltage across its terminals and this can be
achieved using “Pulse Width Modulation” or PWM.
Using PWM enables control of the current in the windings and in
turn the output torque.
The switching transistor has a much reduced power dissipation
giving it a linear type of control which results in better speed
stability.

20. Contd.
The Arduino provides the PWM duty cycle as per the temperature.
The capacitor value provides the respective charging and discharging
capability.
The fan speed intensity thus controlled by the capacitance and speed is
controlled by the PWM duty cycle.

21. At Room Temperature:

22. 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
APPLICATION

23. 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.
ADVANTAGES

24. 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.
FUTURE SCOPE

25. 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.
CONCLUTION