void setup() {
  // put your setup code here, to run once:
  pinMode(18, OUTPUT);
  pinMode(11, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(10, LOW);
  digitalWrite(11, 1);
  delay(1000);
  digitalWrite(10, 1);
  digitalWrite(11, 0);
  delay(1000);
}