int light = 12; // Arduino Uno board pin 12 (digital pin)

void setup() {
  // put your setup code here, to run once:

    pinMode(light, OUTPUT);
    digitalWrite(light, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

    digitalWrite(light, LOW);
    delay(1000);
    digitalWrite(light, HIGH);
    delay(500);
}