int buzzer = A7;
void setup() 
{
  pinMode(A1,OUTPUT);//GREEN
  pinMode(A2,OUTPUT);//BLUE
  pinMode(A3,OUTPUT);//red   CONFIGURATION DEL PIN
  pinMode(8, OUTPUT);
  pinMode(A7,OUTPUT);
  pinMode(buzzer,OUTPUT);
  digitalWrite(buzzer,LOW);
}
void loop() 
{
  digitalWrite(A1,HIGH);
  digitalWrite(A1,LOW);
  digitalWrite(A2,HIGH);
  digitalWrite(A2,LOW);
  digitalWrite(A3,HIGH);
  digitalWrite(A3,LOW);
  digitalWrite(buzzer,HIGH);
  delay(1000);
   digitalWrite(buzzer,LOW);
  delay(1000);
  //tone(buzzer,40,500);
  //noTone(buzzer);
  }