/* Blink 3 LED bergantian — merah, kuning, hijau */ const int ledMerah  = 13;const int ledKuning = 12;const int ledHijau  = 11; void setup() {  pinMode(ledMerah,  OUTPUT);  pinMode(ledKuning, OUTPUT);  pinMode(ledHijau,  OUTPUT);} void loop() {  digitalWrite(ledMerah,  HIGH);  digitalWrite(ledKuning, LOW);  digitalWrite(ledHijau,  LOW);  delay(1000);   digitalWrite(ledMerah,  LOW);  digitalWrite(ledKuning, HIGH);  digitalWrite(ledHijau,  LOW);  delay(1000);   digitalWrite(ledMerah,  LOW);  digitalWrite(ledKuning, LOW);  digitalWrite(ledHijau,  HIGH);  delay(1000);}