#define ledmerah 13 //inisialisasi led pada pin 13 ardunio
#define ledkuning 7 //inisialisasi led pada pin 7 ardunio
#define ledhijau 5 //inisialisasi led pada pin 5 ardunio

void setup() {
  pinMode(ledmerah, OUTPUT);
  pinMode(ledhijau, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  Serial.begin(9600);
  delay(1000);
}

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);
}