unsigned long postit1;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(33, OUTPUT);
  Serial.println("Serial read ()");
   postit1=millis();
  }
void loop() {
 if (Serial.available()){
  char comando=Serial.read();
  if (comando =='a'){
    digitalWrite(33, HIGH);
    Serial.println("acceso sul 33");
  }
  if (comando =='s'){
    digitalWrite(33, LOW);
    Serial.println("spento sul 33");
  }
  if (comando =='t'){
    while (true){
    if (millis()-postit1>=1000){
  digitalWrite(33, ! digitalRead(33));
  Serial.println("lampeggio attivato di regola sul 33");
  postit1=millis();
  }
 }
}
}
}