int red = 3;
int yellow = 4;
int green = 5;

void setup() {
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  //Red is turned on
  digitalWrite(red, HIGH);
  //Yellow and green are off
  digitalWrite(yellow, LOW);
  digitalWrite(green, LOW);
  //wait 7 seconds
  delay(7000);
  //Red and yellow of
  digitalWrite(red,LOW);
  digitalWrite(yellow, LOW);
  //Green turn on
  digitalWrite(green, HIGH);
  //wait 8 seconds
  delay(8000);
  //Green turn off
  digitalWrite(green, LOW);
  //wait 1 second
  delay(1000);
  //Green turned on
  digitalWrite(green, HIGH);
  //Green turn off
  //wait 1 second
  delay(1000);
  digitalWrite(green, LOW);
  //Yellow turned on
  digitalWrite(yellow, HIGH);
  //Red turne of
  digitalWrite(red, LOW);
  //wait 2 seconds
  delay(2000);

  
}