Control Fan With Temperature Sensor Using Arduino Mega 2560

Introduction

• In this article I will explain about controlling the fan by temperature sensor by using Arduino Mega 2560.
  
  
• In the range it can be controlled by the fixed temperature so that it can easily be done. 

Parts Of Lists

• Arduino Mega 2560
• Fan or servo motor
• LM35
• Bread Board
• Hookup Wires. 

Connection

Step 1 Connect the ServoMotor To the Arduino Mega 2560

• Connect the Vcc of the servo Motor to the 5v of the Arduino Mega 2560.
• Connect the gnd of the bluetooth to the Gnd of the Arduino Mega 2560.
• Connect the Vin of the bluetooth to the 09 of the Arduino Mega 2560.
  

Step 2 Connect the Temperature Sensor To The Arduino mega 2560

• The first pin can be connected to the Vcc of the 5V to an Arduino board.
• The second pin can be connected to the A1 of analog side to an Arduino board.
• The third pin can be connected to the Gnd to an Arduino board.

Programming

float temp;

int tempPin = A1; //arduino pin used for temperature sensor

int tempMin = 25; // the temperature to start the buzzer

int tempMax = 70;

int fan = 9; // the pin where fan is connected

int fanSpeed = 0;

void setup()
{

    pinMode(fan, OUTPUT);

    pinMode(tempPin, INPUT);

    Serial.begin(9600);

}

void loop()
{

    temp = analogRead(tempPin);

    temp = (temp * 5.0 * 100.0) / 1024.0; //calculate the temperature in Celsius

    Serial.println(temp);

    delay(1000); // delay in between reads for stability

    if (temp < tempMin)
    {
        // if temp is lower than minimum temp

        fanSpeed = 0; // fan is not spinning

        digitalWrite(fan, LOW);

    }

    if ((temp >= tempMin) && (temp <= tempMax)) //if temperature is higher than the minimum range

    {

        fanSpeed = map(temp, tempMin, tempMax, 32, 255); // the actual speed of fan

        analogWrite(fan, fanSpeed); // spin the fan at the fanSpeed speed

    }

}

Explanation

• In this article I  explained about the temperature based fan control
• When the fan is ON/OFF it has be based on the temperature I have fixed.
• When the temperature is low it can be started. 
• When the temperature is high it can be stopped.