Arduino based automatic temperature controlled fan speed regulator

Arduino based Automatic

Temperature Controlled Fan Speed

Regulator

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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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Block Diagram







Hardware Requirements Arduino develop board

LCD

Transformer

Voltage Regulator

High speed DC motor

Temperature sensor.







Software Requirements

Keil compiler

Language: Embedded C or Assembly.







Power Supply







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.







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.






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.







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.







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.







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.






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 )






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)






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.







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.








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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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.






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.






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.






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.






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 1 and pin number 2 are low leaving pin number 7 as high then the motor rotates in reverse direction.







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.






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.






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.






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.






Disadvantages


It can only be maintained by technical person. Due to temperature variation, after sometimes it’s efficiency may be

decreased.






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.






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/arduino-based-automatic-temperature-controlled-fan-speed-regulator










Date post:	10-Jan-2017
Category:	Engineering
Upload:	edgefxkits-solutions
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Arduino based automatic temperature controlled fan speed regulator

Engineering