const int led = 2;
const int btn = 3;
void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(btn, INPUT_PULLUP);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(btn)==0){
  digitalWrite(led, HIGH);
  Serial.println("open");
  delay(1000);
  digitalWrite(led, LOW);
  Serial.println("close");

  }
  
}