ESP8266 PWM Example


In This post ESP8266 PWM example explains how to use the Pulse Width Modulation (PWM)  with the ESP8266. We will use


ESP8266 can generate PWM on all IO pins. The ESP8266 analogWrite is different than the Arduino Uno. ESP8266 uses 10-bit resolution for PWM generation PWM value varries from 0 to 1023. Arduino Uses 8-Bit Resolution i.e.PWM range is 0-254.

analogWrite, Writes an analog value (PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. After a call to analogWrite(), the pin will generate a steady square wave of the specified duty cycle until the next call to analogWrite() (or a call to digitalRead() or digitalWrite() on the same pin). The frequency of the PWM signal on most pins is approximately 1 KHz.

LED Fading Program using ESP8266 PWM

/* Generates PWM on Internal LED Pin GPIO 2 of ESP8266*/

#include <ESP8266WiFi.h>
#define LED 2

int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by

// Power on setup
void setup() {

// Main Program Loop
void loop() {
//PWM Value varries from 0 to 1023 
Serial.println("10 % PWM");

Serial.println("20 % PWM");

Serial.println("40 % PWM");

Serial.println("70 % PWM");

Serial.println("100 % PWM");

//Continuous Fading
Serial.println("Fadding Started");
// set the brightness of pin 9:
analogWrite(LED, brightness);

// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;

// reverse the direction of the fading at the ends of the fade:
if (brightness <= 0 || brightness >= 1023) {
fadeAmount = -fadeAmount;
// wait for 30 milliseconds to see the dimming effect

Upload program in your ESP and open serial monitor.

In this tutorial we’ve shown you ESP8266 PWM Example. I hope you like this ESP8266 PWM Example. Do you have any questions? Leave a comment down below!

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Hi, I'm Harshvardhan Mishra. Tech enthusiast and IT professional with a B.Tech in IT, PG Diploma in IoT from CDAC, and 6 years of industry experience. Founder of HVM Smart Solutions, blending technology for real-world solutions. As a passionate technical author, I simplify complex concepts for diverse audiences. Let's connect and explore the tech world together! If you want to help support me on my journey, consider sharing my articles, or Buy me a Coffee! Thank you for reading my blog! Happy learning! Linkedin

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