This Arduino code sets up pin 13 as an output and then uses it in a loop to blink an LED connected to that pin. The loop turns the pin high for 1 second, then low for 1 second, and repeats - with longer delays of 5 seconds for every third cycle, causing the LED to blink in a distinctive pattern.

1. Voidsetup() {
Pinmode (13, OUTPUT);
}
Voidloop() {
digitalWrite(13,HIGH);
delay(1000);
digitalWrite(13,LOW);
delay(1000);
digitalWrite(13,HIGH);
delay(5000);
digitalWrite(13,LOW);
delay(5000);
digitalWrite(13,HIGH);
delay(1000);
}