const int pinLED = 8;

void setup() {
  pinMode(pinLED, OUTPUT);
}
int timeDelay = 1000;

void loop() {
  digitalWrite(pinLED, HIGH);
  timeDelay = timeDelay - 100;
  delay(timeDelay);
  if(timeDelay <= 100){
    timeDelay = 1000;
  }
digitalWrite(pinLED, LOW);
delay(500);
}