//pin led
#define led red 12
#define led blue 11
#define led green 13

void setup()
{ // led merah biru dan hijau sebagai output
  pinMode(led red,   OUTPUT);
  pinMode(led blue,  OUTPUT);
  pinMode(led green, OUTPUT);
} 

void loop()}
digitalWrite(led red,  HIGH);  //red nyala
digitalWrite(led blue,  LOW);  //blue mati
digitalWrite(led green, LOW);  //green mati
delay(1000);                   //tunggu 1 detik
{
digitalWrite(led red,   LOW);  //red mati
digitalWrite(led blue,  HIGH); //blue nyala
digitalWrite(led green, LOW);  //green mati
delay(1000);                   //tunggu 1 detik
}

{
digitalWrite(led red,   LOW);  //red mati
digitalWrite(led blue,  LOW);  //blue mati
digitalWrite(led green, HIGH);  //green nyala
delay(1000);                    //tunggu 1 detik
}