int red = 10;
int yellow = 9;
int green = 8;

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

void loop(){
changeLights();
delay(15000);
}

void changeLights()
{
Serial.println("ASD");
digitalWrite(green, LOW);
digitalWrite(yellow, HIGH);
for(int i=3; i>0;i--){
  Serial.println(i);
  delay(1000);
  }
delay(3000);

digitalWrite(yellow, LOW);
digitalWrite(red, HIGH);
delay(5000);
digitalWrite(yellow, HIGH);
delay(2000);
digitalWrite(yellow, LOW);
digitalWrite(red, LOW);
digitalWrite(green, HIGH);
delay(3000);
}