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 a 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 the 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 the temperature based fan control
• When the fan is ON/OFF it has been 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.