int pwmPin = 11; //define output pin, Meergranen output pin is 11

void setup() {
 pinMode(pwmPin, OUTPUT); //set pin as output
}

void loop() { // run forever

  for(int value = 0; value<=255; value++){ // cycle through 255 values, start at 0. 8 bit output == 255 values
    analogWrite(pwmPin, value); // analogWrite simulates smooth sinewave using complex pwm duty cycles
    delay(30);
    }

  delay(30);

  // when value == 255, run loop below
  for(int value = 255; value>=0; value--){ // each loop substract 1 from value
     analogWrite(pwmPin, value); // analogWrite simulates smooth sinewave using complex pwm duty cycles
    delay(30);
    }
    
  delay(10);

}