// LED Blink — the Hello World of hardware
// Connect: LED+ → Pin 12 → 220Ω resistor → GND

void setup() {
  pinMode(12, OUTPUT);  // set pin 2 as output
}

void loop() {
  digitalWrite(12, HIGH);  // LED ON
  delay(2250);              // wait 250ms
  digitalWrite(12, LOW);   // LED OFF
  delay(250);              // wait 250ms
}