ESP32 - Control Fan

This tutorial instructs you how to use ESP32 to control a fan.

Hardware Used In This Tutorial

1	×	ESP-WROOM-32 Dev Module
1	×	Micro USB Cable
1	×	Relay
1	×	12V Cooling Fan
1	×	12V Power Adapter
1	×	Jumper Wires
1	×	(Optional) 5V Power Adapter
1	×	(Optional) DC Power Jack
1	×	(Optional) ESP32 Screw Terminal Adapter

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How to Control Fan

If we connect a 12V power supply to a 12V fan, the fan spins at full speed.
If we connect a 12V PWM signal to a 12V fan, the fan spins at a speed in proportion to the PWM's duty cycle.

This tutorial instructs you how to use ESP32 to turn on/off a fan. Controlling the speed of a fan will be presented in another tutorial.

Because the fan uses the high voltage, we cannot connect it directly to ESP32, we need to connect fan to ESP32 indirectly via a relay. We have specific tutorials about relay (pinout, how it works, how to program ...), learn about relay in the ESP32 - Relay tutorial

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

ESP32 Code

The below code periodically turns the fan ON/OFF in every 10 seconds.

/* * This ESP32 code is created by esp32io.com * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-controls-fan */ #define RELAY_PIN 27 // ESP32 pin GIOP27, 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 10 seconds delay(10000); digitalWrite(RELAY_PIN, LOW); // turn off fan 10 seconds delay(10000); }

Quick Instructions

If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
Do the wiring as above image.
Connect the ESP32 board to your PC via a micro USB cable
Open Arduino IDE on your PC.
Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
Copy the above code and paste it to Arduino IDE.
Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
See the fan's state

Line-by-line Code Explanation

The above ESP32 code contains line-by-line explanation. Please read the comments in the code!

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