analog.md

analogOut.ino

// constant for the pin the LED is attached to
const int ledPin = 2;

void setup() {
  // set the led pin as an output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // analogWrite has 8-bits of precision
  // it has 256 steps (between 0 -255)
  // 0 == 0V  while  255 == 3.3V
  
  for (int i = 0; i < 255; i++) {
    analogWrite(ledPin, i);
    delay(15); // slight delay so we can see the fade
  }

  for (int i = 255; i > 0; i--) {
    analogWrite(ledPin, i);
    delay(15);
  }
}