Published March 24, 2018 © LGPL

Automatic Fan Control System

A useful project on an Arduino control system: a complete tutorial video with explanation of the schematic, components used and code.

IntermediateFull instructions provided2 hours27,976

Things used in this project

Hardware components

UTSOURCE Arduino Uno R3

UTSOURCE BreadBoard

UTSOURCE Jumping Wires

General Purpose Transistor NPN

Adafruit Standard LCD - 16x2 White on Blue

Software apps and online services

Arduino IDE

Story

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Automatic Fan Introduction

Electric Fan is one of the most popular electrical devices due to its cost effectiveness and low power consumption advantages. It is a common circuit and widely used in many applications. It is also one of the most sensible solutions to offer a comfortable and energy efficient. In fact, the fan has been long used and still available in the market.

Nowadays, the demand for accurate temperature control and air freshening control has conquered many of industrial domains such as process heat, automotive, industrial places or office buildings where the air is cooled in order to maintain a comfortable environment for its occupants. One of the most important concerns involved in heat area consist in the desired temperature achievement and consumption optimization. Fan can be controlled manually by pressing on the switch button. Where in this method, any change in the temperature will not give any change in the fan speed. Except the usage change the speed of the fan which is manually. So, an automatic temperature control system technology is needed for the controlling purpose in the fan speed according to the temperature changes.

Automatic Fan Control for Air Conditioning System

The automatic air conditioning system can be done by using Electronic circuit using Microprocessor or microcontrollers. Now microcontroller is advanced among all above circuits therefore we are using microcontrollers for air conditioning such as the Arduino,

This system designed with microcontroller, FAN, temperature sensor and a DC motor. The temperature sensor is used to detect the temperature of that environment and send that information to the ADC then that result sends to the microcontroller. Then the microcontroller performs the comparison of current temperature and set temperature as per the logic of the program for which microcontroller has already been programmed. The result obtained from the above operation is given through output port of a microcontroller to the LCD display of relevant data and generated pulses as per the logic program which is further fed to the driver circuit to obtain the desired output to fan.

Advantages of Air Conditional Fan

The advantages of automatic fan control for air conditioning system mainly include the following.

Quick cooling
More cooling and less moisture removable
Good for daytime, when cooling loads are low and humidity high
Energy efficient, partly because it removes less moisture
Low speed settings
More moisture removable
Lower fan noise and quieter operations
Good for nighttime, when cooling loads are low and humidity is high
Increased comfort level
Slight loss in efficiency

Working of Automatic Fan

In this Arduino based project, we are going to control DC fan speed according to the room temperature and show these parameter changes on a 16x2 LCD display. It is accomplished by the data communications between Arduino, LCD, DHT11 sensor Module and DC fan that is controlled by using PWM. PWM is a technique by using which we can control voltage.

This project consists of three sections. One senses the temperature by using humidity and temperature sensor namely DHT11. Second section reads the DHT11 sensor module’s output and extracts temperature value into a suitable number in Celsius scale and control the fan speed by using PWM. And last part of system shows humidity and temperature on LCD and Fan driver.

Here in this project we have used a sensor module namely DHT11 that are already have discuss our previous project namely “Humidity and Temperature Measurement using Arduino”. Here we have only used this DHT sensor for sensing temperature, and then programmed our Arduino according to the requirements.

Working of this project is very simple. We have created PWM at PWM pin of Arduino and applied it at base terminal of transistor. Then the transistor creates a voltage according to the PWM input.

Here is the link to my website https://aquabcasing.com/

Code

code

#include<dht.h>      // Including library for dht
#include<LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
#define dht_dpin 12 
dht DHT;
#define pwm 9
byte degree[8] = 
              {
                0b00011,
                0b00011,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000
              };
void setup()
{
 lcd.begin(16, 2);
 lcd.createChar(1, degree);
 lcd.clear();
 lcd.print("   Fan Speed  ");
 lcd.setCursor(0,1);
 lcd.print("  Controlling ");
 delay(2000);
 analogWrite(pwm, 255);
 lcd.clear();
 lcd.print("Circuit Digest ");
 delay(2000);
}
void loop()
{
  DHT.read11(dht_dpin);
  int temp=DHT.temperature;
  lcd.setCursor(0,0);
  lcd.print("Temperature:");
  lcd.print(temp);   // Printing temperature on LCD
  lcd.write(1);
  lcd.print("C");
  lcd.setCursor(0,1);
  if(temp <26 )
    { 
      analogWrite(9,0);
      lcd.print("Fan OFF            ");
      delay(100);
    }
    
    else if(temp==26)
    {
      analogWrite(pwm, 51);
      lcd.print("Fan Speed: 20%   ");
      delay(100);
    }
    
     else if(temp==27)
    {
      analogWrite(pwm, 102);
      lcd.print("Fan Speed: 40%   ");
      delay(100);
    }
    
     else if(temp==28)
    {
      analogWrite(pwm, 153);
      lcd.print("Fan Speed: 60%   ");
      delay(100);
    }
    
    else if(temp==29)
    {
      analogWrite(pwm, 204);
      lcd.print("Fan Speed: 80%    ");
      delay(100);
    }
     else if(temp>29)
    {
      analogWrite(pwm, 255);
      lcd.print("Fan Speed: 100%   ");
      delay(100);
    } 
  delay(3000);

Credits

Engr Muhammad Sheraz

14 projects • 64 followers

BSc Electerical Enginer and An Expert Academic Writer https://aquabcasing.com/WhatsApp: +923057608848

Automatic Fan Control System

Things used in this project

Hardware components

Software apps and online services

Story

Automatic Fan Introduction

Automatic Fan Control for Air Conditioning System

Advantages of Air Conditional Fan

Working of Automatic Fan

Schematics

Circuit Diagram

Code

code

Credits

Engr Muhammad Sheraz

Comments

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Automatic Fan Control System

Automatic Fan Control System

Things used in this project

Hardware components

Software apps and online services

Story

Automatic Fan Introduction

Automatic Fan Control for Air Conditioning System

Advantages of Air Conditional Fan

Working of Automatic Fan

Schematics

Circuit Diagram

Code

code

Credits

Engr Muhammad Sheraz

Comments

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