Arduino LED 3,2,1 Countdown tidtagare

void setup() {
pinMode(2,OUTPUT); Röd LED
pinMode(3,OUTPUT); gul lysdiod
pinMode(1,OUTPUT); Grön LED
pinMode(4,OUTPUT); "gå" tecken
}
void loop() {
digitalWrite(2,HIGH);
Delay(1000);
digitalWrite(2,LOW);
digitalWrite(3,HIGH);
Delay(1000);
digitalWrite(3,LOW);
digitalWrite(1,HIGH);
Delay(1000);
digitalWrite(1,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
Delay(500);
digitalWrite(4,HIGH);
Delay(500);
digitalWrite(4,LOW);
}