Ed inoltre senza indentazione non si capiscono i blocchi di codice:
void loop() {
digitalWrite(redPin, LOW);
digitalWrite(greenPin, HIGH);
digitalWrite(yellowPin,LOW);
delay(10000);
digitalWrite(greenPin,LOW);
for(int x = 0; x < 10; x++) {
digitalWrite(yellowPin,HIGH);
delay(500);//attende 500ms
digitalWrite(yellowPin,LOW);
delay(500);
}
digitalWrite(yellowPin, LOW);
digitalWrite(greenPin, LOW);
digitalWrite(redPin, HIGH);
delay(10000);
}