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Arduino based Automatic
Temperature Controlled
Fan Speed Regulator
Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Introduction
 This practical temperature controller controls the temperature of any
device according to its requirement for any industrial application, it also
has a feature of remote speed control. The LM-35 Analog Temperature
device is interfaced to analog pin of Arduino board, where it has built in
ADC which converts these analog reading and displays it on a LCD, which
indicate the temperature of the device. User-defined temperature
settings can be done using push buttons provided through Arduino
board.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Block Diagram
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Hardware Requirements
 Arduino develop board
 LCD
 Transformer
 Voltage Regulator
 High speed DC motor
 Temperature sensor.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Software Requirements
 Keil compiler
 Language: Embedded C or Assembly.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Power Supply
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Arduino Board
 Arduino is a single-board microcontroller.
 Intended to make the application of interactive objects and
environments more easier.
 Basically this is very user friendly. There is a microcontroller unit
embedded on it.
 The code is directly loaded from the computer.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Arduino
 The Arduino microcontroller is an easy to use yet powerful single
board computer.
 It has gained considerable traction in the hobby and professional
market.
 The Arduino is open-source.
 Which means hardware is reasonably priced and development
software is free.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Electronic Speed Control
 An electronic speed control or ESC is simply an electronic circuit
which is used to control the speed of dc motor.
 It can take up to 30Amp Continuous current.
 It has the feature of automatic power cut off, over heat
protection, over voltage protection.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Battery
 Lithium-ion polymer battery is used here.
 It is rechargeable and it provides required power to arduino board
and dc motor and other components.
 It can last for long time after charged once.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
DC Motor
 Brushless DC electric motor is a device powered by a DC electric
source via an integrated power supply
 It produces an AC electric signal to drive the motor.
 It can give up to 10,300 rpm.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Liquid Crystal Display (LCD)
 Most common LCDs connected to the microcontrollers are 16x2
and 20x2 displays.
 This means 16 characters per line by 2 lines and 20 characters
per line by 2 lines, respectively.
 The standard is referred to as HD44780U, which refers to the
controller chip which receives data from an external source (and
communicates directly with the LCD.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LCD Background
 If an 8-bit data bus is used the LCD will require 11 data lines
(3 control lines plus the 8 lines for the data bus)
 The three control lines are referred to as EN, RS, and RW
 EN=Enable (used to tell the LCD that you are sending it data)
 RS=Register Select (When RS is low (0), data is treated as a
command)
(When RS is High(1), data being sent is text data )
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LCD Background
 R/W=Read/Write (When RW is low (0), the data written to the
LCD)
(When RW is low (0), the data reading to the LCD)
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LCD Display
 LCD display is a flat panel electronic visual display.
 26×4 display board is used in this project.
 Value of temperature in degree Celsius.
 Corresponding value of speed in rpm are displayed.
 It also displays the temperature on an LCD display in the range
of –55°C to +125°C.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LM 35 Temperature Sensor
 LM35 are used to sense the heat and an IC ADC0808 is used to
convert the data into digital.
 LM35 digital sensor has got 3 pin’s i.e., VCC, GND and output pin’s
when LM35 is heated the voltage at output pin increases.
 It is connected to the analog to digital convertor IC (ADC).
 The LM35 series are precision integrated-circuit temperature
sensors, whose output voltage is linearly proportional to the Celsius
(Centigrade) temperature.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LM 35 Temperature Sensor
 The LM35 thus has an advantage over linear temperature sensors
calibrated in Kelvin.
 As the user is not required to subtract a large constant voltage
from its output to obtain convenient Centigrade scaling.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
LM 35 Temperature Sensor
 The LM35 does not require any external calibration or trimming to
provide typical accuracies of ±1⁄4˚C at room temperature and ±3⁄4˚C
over a full −55 to +150˚C temperature range.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
MOTOR Driver L293D
 L293D is a dual H-bridge motor driver integrated circuit (IC).
 Motor drivers act as current amplifiers since they take a low-current
control signal and provide a higher-current signal.
 This higher current signal is used to drive the motors.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
MOTOR Driver L293D
 L293D contains two inbuilt H-bridge driver circuits.
 In its common mode of operation, two DC motors can be driven
simultaneously, both in forward and reverse direction.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Operation of Motor Driver
 L293D has 2 set of arrangements.
 One set has input 1, input 2, output 1
and output 2.
 Other set has input 3, input 4, output 3
and output 4.
 According to block diagram if pin no 2
& 7 are high then pin no 3 & 6 are also
high.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Operation of Motor Driver
 If enable 1 and pin number 2 are high leaving pin number 7 as low then
the motor rotates in forward direction.
 If enable 2 and pin number 10 are high leaving pin number 15 as low
then the motor rotates in forward direction.
 If enable 1 and pin number 2 are low leaving pin number 7 as high then
the motor rotates in reverse direction.
 If enable 2 and pin number 15 are high leaving pin number 10 as low
then the motor rotates in forward direction.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Working Principle
 The heart of the circuit is an Arduino board which controls all its
functions.
 An IC LM35 is used as temperature sensor.
 The LM-35 analog temperature device is interfaced to the analog pin of
the Arduino board.
 It’s built-in ADC, which converts these analog reading and displays that
on the LCD, to indicate temperature of the device.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Working Principle
 User-defined temperature settings can be done using push buttons
provided through Arduino board.
 Maximum and minimum settings are used for allowing any necessary
hysteresis.
 Few push buttons are used to set the temperature by INC, for increase
and DEC for decrease settings.
 As soon the max and min temperatures are set then the Arduino
program generates PWM output on the corresponding digital output
according to the measured temperature.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Working Principle
 This is fed to a DC Fan through a motor driver IC.
 The fan speed is proportional to the temperature measured.
 Standard power supply of 12 volt DC and 5 volt through a regulator are
made from a step-down transformer along with a bridge rectifier and
filter capacitor.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Advantages
 Since it is an automated system .
 It is programmed effectively so that no interruptions would stop its
functionality.
 To monitor the environment, that is not comfortable or possible to
monitor for humans (especially for extended periods of time).
 Prevents waste of energy.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Disadvantages
 It can only be maintained by technical person.
 Due to temperature variation, after sometimes it’s efficiency may be
decreased.
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Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Future Enhancement
 This project can be enhanced by using higher power electronic devices
to operate high capacity DC motors.
 Regenerative braking for optimizing the power consumption can also
be incorporated.
http://www.edgefxkits.com/
Arduino based Automatic Temperature
Controlled Fan Speed Regulator
Conclusion
 Arduino based Automatic Temperature Controlled Fan Speed Regulator
Project was designed and Implemented. This project can be enhanced by
using higher power electronic devices to operate high capacity DC motors.
Regenerative braking for optimizing the power consumption can also be
incorporated.
http://www.edgefxkits.com/
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