How to Control LED Brightness with Arduino

In this post, we will see how we can control brightness of LED.

I am using 2 inputs for controlling, inreasing and decreasing.

One LED for output.

Find the code below.

//Controlling LED brightness with two input buttons

//Code by Deepak Sharma [ElectroMech Lab]

const int ledPin = 3;  // LED connected to pin 3

const int buttonUpPin = 2;  // Button to increase brightness connected to pin 2

const int buttonDownPin = 12;  // Button to decrease brightness connected to pin 12

int brightness = 128;  // Initial brightness (range from 0 to 255)

const int brightnessStep = 5;  // Step to increase/decrease brightness

void setup() {

  pinMode(ledPin, OUTPUT);

  pinMode(buttonUpPin, INPUT_PULLUP);

  pinMode(buttonDownPin, INPUT_PULLUP);

  analogWrite(ledPin, brightness);  // Set initial brightness

}

void loop() {

  if (digitalRead(buttonUpPin) == LOW) {  // Button is pressed (active low)

    brightness += brightnessStep;  // Increase brightness

    if (brightness > 255) {

      brightness = 255;  // Cap the maximum brightness

    }

    analogWrite(ledPin, brightness);  // Update LED brightness

    delay(100);  // Debounce delay

  }

  

  if (digitalRead(buttonDownPin) == LOW) {  // Button is pressed (active low)

    brightness -= brightnessStep;  // Decrease brightness

    if (brightness < 0) {

      brightness = 0;  // Cap the minimum brightness

    }

    analogWrite(ledPin, brightness);  // Update LED brightness

    delay(100);  // Debounce delay

  }

  

}