# define ledPin 2
bool toggleLED = false;
long time1;
int pauseTime = 1000

void setup() {
  pinMode(ledPin, OUTPUT); 
  time1 = millis();
}

void loop() {
  if(millis()-time1 > pauseTime){
    if(toggleLED == true){
      digitalWrite(ledPin, HIGH);
      toggleLED = false;
    }
    else{
      digitalWrite(ledPin, LOW);
      toggleLED = true;
    }
    time1 = millis();
  }
}