LED Brightness Control Using PWM

Solving Approach:

How do you plan to solve it?

Configure a PWM pin as output to LED and then write code to vary the duty cycle.

Code

/*Paste your code here*/
int ledPin = 9; 

void setup() 
{
  pinMode(ledPin, OUTPUT);
}

void loop() 
{
  // Increase brightness
  for (int brightness = 0; brightness <= 255; brightness++) {
    analogWrite(ledPin, brightness); // Set PWM duty cycle
    delay(8);
  }

  // Decrease brightness
  for (int brightness = 255; brightness >= 0; brightness--) {
    analogWrite(ledPin, brightness);
    delay(4);
  }
}


 

Output

Video

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Photo of Output

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