LED blink code

int ledPin = 13; // Declare a variable for the LED pin

void setup() {

  pinMode(ledPin, OUTPUT); // Set ledPin as output

}

void loop() {

  digitalWrite(ledPin, HIGH); // Turn on the LED

  delay(1000);                // Wait for 1 second

  digitalWrite(ledPin, LOW);  // Turn off the LED

  delay(1000);                // Wait for 1 second

}