void setup() {
  // put your setup code here, to run once:
pinMode (7,OUTPUT );
pinMode (6,OUTPUT );
pinMode (5,OUTPUT );
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(7,LOW );
digitalWrite(6,LOW );
digitalWrite(5,HIGH);
delay (1000);

//led kuning mulai nyala sebelum 1 detik led hijau mati 
digitalWrite (7,LOW);
digitalWrite(6,HIGH);
digitalWrite(5,LOW );
delay (1000);

//led merah menyala 2 detik 
digitalWrite(7, LOW);
digitalWrite(6,LOW );
digitalWrite(5,HIGH);
delay (1000);

//led hijau menyala 2 detik
digitalWrite(7,HIGH );
digitalWrite(6, LOW );
digitalWrite(5, LOW );
delay(1000);
}