unsigned char  count=0;




void setup() {

  Serial.begin (9600);

}




void loop() {

  count=count+1;

  delay(500); //1 seconde

  Serial.println(count);

}

unsigned char  count=0;




void setup() {

  Serial.begin (9600);

}




void loop() {

  count=count+1;

  for (int i=1; i<500; i++)

      delayMicroseconds(1000); //1/2 seconde

  Serial.println(count);

}