Arduino - Controls Fan

Arduino can not only turn on/off the fan but also control the fan's speed.

In this tutorial, we are going to learn how to turn on/off a fan using Arduino. Controlling the fan's speed will be presented in another tutorial.

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Relay
1×12V Cooling Fan
1×12V Power Adapter
n×Jumper Wires
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How to Control Fan

  • If 12V fan is powered by 12V power supply, it run with full speed.
  • If 12V fan is powered by 12V PWM signal, The fan's speed can be controlled.

In this tutorial, we are going to learn how to turn on/off a fan using Arduino. Controlling the fan's speed will be presented in another tutorial. To turn on/off a fan, we need to use a relay in between Arduino and fan. Arduino can turn on/off the fan via the relay. If you do not know about relay (pinout, how it works, how to program ...), learn about relay in the Arduino - Relay tutorial

Wiring Diagram

Arduino Fan Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

Arduino Code

The below code repeatedly turns the fan ON in five seconds and OFF in five seconds,

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-controls-fan */ // constants won't change const int RELAY_PIN = A5; // the Arduino pin, which connects to the IN pin of relay // the setup function runs once when you press reset or power the board void setup() { // initialize digital pin A5 as an output. pinMode(RELAY_PIN, OUTPUT); } // the loop function runs over and over again forever void loop() { digitalWrite(RELAY_PIN, HIGH); // turn on fan 5 seconds delay(5000); digitalWrite(RELAY_PIN, LOW); // turn off fan 5 seconds delay(5000); }

Quick Steps

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
  • See the fan's state

Code Explanation

Read the line-by-line explanation in comment lines of code!

Video Tutorial

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