int green = 9;

int yellow = 10;

int red = 11;

​

void setup() {

  pinMode(green,OUTPUT);

  pinMode(yellow,OUTPUT);

  pinMode(red,OUTPUT);

  }

​

  void loop() {

    digitalWrite(green, HIGH);

    delay(1000);

    digitalWrite(green,LOW);

    digitalWrite(yellow, HIGH);

    delay(3000);

    digitalWrite(yellow,LOW);

    digitalWrite(red, HIGH);

    delay(5000);

    digitalWrite(red,LOW);

  }

​