Published January 29, 2021

Automatic fan control system using LM35 temperature sensor

In this project I have made a automatic fan control system which switch on and off the fan according to the temperature inside the room.

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Automatic fan control system using LM35 temperature sensor

Things used in this project

Hardware components

Arduino UNO

DFRobot Gravity: Analog LM35 Temperature Sensor For Arduino

LED (generic)

Geared DC Motor, 12 V

Jumper wires (generic)

9V battery (generic)

Software apps and online services

Arduino IDE

Story

This project is all about making an automatic fan control system with automatically switch on and off the fan according the temperature inside the room. Here I have used a microcontroller Arduino UNO you can use MINI also but there will be some power regulations problem will occur so go for UNO :) The temperature sensor here is the LM35 you can use module also it will give you the more accurate readings. There are 2 LEDs which indicates status of the fan Green- ON, Red- OFF. There is one DC motor which is our fan, we are going to control this motor.

D1 & D2 are indication lights

As LM35 is an analog sensor we have to use AnalogRead() operation to get the values from the sensor and then we will perform function using if-else loop. If the temperature is greater then 30 then Green light will ON and motor(fan) stars rotating to maintain the room temperature. else the fan will be in OFF condition and Red led will remain on.

If-else loop

I have made the circuit in the Proteus software and transfer the.HEX into the Arduino, If you have the hardware you can directly make circuit using it. In Arduino Ide you can see the result using serial monitor and in Proteus also you can have serial monitor in the instrument option which will show you the values.

Serial monitor in Proteus

Code

Automatic fan control system using LM35 temperature sensor

//this project is made by Manish Kumar Yadav
int motorpin=9;
int sensorpin= A0;  
int sensorval;
int ledpin1=13;
int ledpin2=12;
void setup() {
  pinMode(motorpin,OUTPUT);
  pinMode(sensorpin,INPUT); 
  pinMode(ledpin1,OUTPUT);
  pinMode(ledpin2,OUTPUT);
  // put your setup code here, to run once:

}

void loop() {
  sensorval=analogRead(sensorpin);
  sensorval=sensorval/2.0741;
  if(sensorval>30)
  {
    digitalWrite(motorpin,HIGH);
    digitalWrite(ledpin1,HIGH);
    digitalWrite(ledpin2,LOW);
    delay(500);
  }
  else
  {
    digitalWrite(motorpin,LOW);
    digitalWrite(ledpin1,LOW);
    digitalWrite(ledpin2,HIGH);
    delay(500);
  }
}

Credits

Manish Kumar Yadav

11 projects • 17 followers

Highly skilled Electronics and Communication Engineer, adept Programmer, and creative PCB Designer.

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Automatic fan control system using LM35 temperature sensor

Automatic fan control system using LM35 temperature sensor

Things used in this project

Hardware components

Software apps and online services

Story

Schematics