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

Connection

Step 1 Connect the ServoMotor To 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
}
}