const int Leb_pin = 9;
void setup() {
  // put your setup code here, to run once:
pinMode(Leb_pin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(Leb_pin,HIGH);
  delay(2000);
  digitalWrite(Leb_pin,LOW);
  delay(2000);
}