How to Make Temperature Controlled Fan Using Arduino and DHT11

Temperature-controlled fans have become a popular DIY project for keeping your surroundings cool automatically. In this blog, we will guide you through creating a temperature-controlled fan using an Arduino board. With just a few electronic components and a little bit of coding, you can have a fan that activates when the temperature starts to rise, providing a cost-effective and efficient solution.

Arduino uno

DHT11

Display

Potentiometer

Fan

Jumper Wire

Bread Board

Connect all the electronics as shown in the figure

You can also Refer to this video - Click here

The Arduino IDE is the software you will use to write and upload code to your Arduino board. You can download it for free from the Arduino website.

Arduino IDE

Connect the Arduino Board with the Arduino IDE and upload the given CODE

#include <DHT.h>

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#define DHTPIN 2

#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

const int potPin = A0;

const int fanPin = 3; // Connect the fan to this pin

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address and dimensions

void setup() {

  dht.begin();

  pinMode(fanPin, OUTPUT);

  lcd.init();                      // Initialize the LCD

  lcd.backlight();                 // Turn on the backlight

  lcd.setCursor(0, 0);

  lcd.print("Temp Fan Control");

  lcd.setCursor(0, 1);

  lcd.print("by Your Name");

  delay(2000);

  lcd.clear();

}

void loop() {

  int threshold = map(analogRead(potPin), 0, 1023, 20, 40); // Map potentiometer value to temperature range

  float temperature = dht.readTemperature();

  if (temperature > threshold) {

    digitalWrite(fanPin, HIGH); // Turn on the fan

  } else {

    digitalWrite(fanPin, LOW); // Turn off the fan

  }

  lcd.clear();

  lcd.setCursor(0, 0);

  lcd.print("Temp: ");

  lcd.print(temperature);

  lcd.print("C");

  lcd.setCursor(0, 1);

  lcd.print("Threshold: ");

  lcd.print(threshold);

  lcd.print("C");

  delay(1000);

}

You can refer to this video