unsigned long pastmil;
const int blink = 1000;
int ledstate = LOW;
const int blinkpin = 7;


void setup() {
  pinMode(blinkpin, OUTPUT);

}


void loop() {
  unsigned long currentmil = millis();

  if (currentmil - pastmil >= blink) {
    pastmil = currentmil;

    if (ledstate == LOW) {
      ledstate = HIGH;
    }
    else
    {
      ledstate = LOW;
    }
    digitalWrite(blinkpin, ledstate);
  }


}