Day 1 03 - for LED

const int ledPin = 13;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(ledPin, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  for (int t = 0; t <= 10; t++) {
    int cnt = 0;
    while (true) {
      digitalWrite(ledPin, HIGH);
      delay(t);
      digitalWrite(ledPin, LOW);
      delay(10 - t);

      cnt++;
      if (cnt == 10) break;
    }
  }
}

for문을 이용해 점점밝아지는 LED