// 🛠 First Arduino Program: Blink an LED every second

// 1️⃣ Define the LED pin number
int ledPin = 13;  // Most Arduino boards have a built-in LED on pin 13

void setup() {
  pinMode(ledPin, OUTPUT);  // 2️⃣ Set pin 13 as an output
}

void loop() {
  digitalWrite(ledPin, HIGH);  // 3️⃣ Turn ON the LED
  delay(1000);                 // 4️⃣ Wait for 1 second
  digitalWrite(ledPin, LOW);   // 5️⃣ Turn OFF the LED
  delay(1000);                 // 6️⃣ Wait for 1 second
}