int ledmerah=4;
int ledkuning=3;
int ledhijau=2;

void setup() {
  // put your setup code here, to run once:
pinMode(ledmerah, OUTPUT);
pinMode(ledkuning, OUTPUT);
pinMode(ledhijau, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(ledmerah, HIGH);
digitalWrite(ledkuning, LOW);
digitalWrite(ledhijau, LOW);
delay(5000);

digitalWrite(ledmerah, LOW);
digitalWrite(ledkuning, HIGH);
digitalWrite(ledhijau, LOW);
delay(5000);

digitalWrite(ledmerah, LOW);
digitalWrite(ledkuning, LOW);
digitalWrite(ledhijau, HIGH);
delay(5000);
}