#define PINLED 13
#define PINBTNvite 2
#define PINBTNlent 3
int led_STAT=LOW;
int tempo=1000;
void IsrPinBtnvite ();
void IsrPinBtnlent ();

void setup() {
  pinMode(PINLED, OUTPUT);
  pinMode(PINBTNvite, INPUT_PULLUP);
  pinMode(PINBTNlent, INPUT_PULLUP);
  digitalWrite(PINLED,led_STAT);
  attachInterrupt(digitalPinToInterrupt(PINBTNvite), IsrPinBtnvite, FALLING);

  attachInterrupt(digitalPinToInterrupt(PINBTNlent), IsrPinBtnlent, FALLING);

}

void loop() {
// des choses utile s
 digitalWrite(PINLED, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(tempo);                      // wait for a second
  digitalWrite(PINLED, LOW);   // turn the LED off by making the voltage LOW
  delay(tempo);                      // wait for a second
}


void IsrPinBtnvite ()
{
  tempo=tempo-100;
  if (tempo<=0) tempo=100;
}
void IsrPinBtnlent ()
{
  tempo=tempo+100;
  if (tempo>5000) tempo=5000;
}