void setup() {
  // put your setup code here, to run once:
pinMode(2, OUTPUT);//red
pinMode(3, OUTPUT);//yellow
pinMode(4, OUTPUT);//green
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(2, HIGH);
  Serial.println("Red light on");
  delay(8000);
  digitalWrite(2, LOW);
    Serial.println("Red light off");
  digitalWrite(3, HIGH);
    Serial.println("Yellow light on");
  delay(3000);
  digitalWrite(3, LOW);
    Serial.println("Yellow light off");
  digitalWrite(4, HIGH);
    Serial.println("Green light on");
  delay(5000);
  digitalWrite(4, LOW);
    Serial.println("Green light off");

}