int period = 500;
int period1 = 600;
long timer = 0;
long timer1 = 0;
boolean statLED=LOW;
void setup() {
  // put your setup code here, to run once:
  pinMode(11, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  statLED=LOW;
  digitalWrite(11, statLED);
  long now = millis();
  if (now - timer >= period)
  {
    timer=now;
    statLED=HIGH;
  }

  digitalWrite(11,statLED);
}