int red =11;
int yellow = 12;
int green = 13;
void setup() {
  // put your setup code here, to run once:
pinMode(red, OUTPUT);
pinMode(yellow , OUTPUT);
pinMode(green , OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(red, HIGH);
digitalWrite(yellow , LOW);
digitalWrite(green, LOW);
delay(1500);

digitalWrite(red, LOW);
digitalWrite(yellow , HIGH);
digitalWrite(green , LOW);
delay(1500);

digitalWrite(red, LOW);
digitalWrite(yellow , LOW);
digitalWrite(green , HIGH);
delay(1500);

digitalWrite(red, LOW);
digitalWrite(yellow , LOW);
digitalWrite(green , LOW);
delay(1500);

digitalWrite(red, HIGH);
digitalWrite(yellow , HIGH);
digitalWrite(green , HIGH);
delay(1500);






}