const int buttonPin=4;
const int ledPin=5;
int buttonState=0;
void setup() {
  Serial.begin(115200);
  pinMode(buttonPin,INPUT);
  pinMode(ledPin,OUTPUT);
}

void loop() {
  buttonState=digitalRead(buttonPin);
  Serial.println(buttonState);
  if(buttonState==HIGH){
    digitalWrite(ledPin,HIGH);
  }
  else{
    digitalWrite(ledPin,LOW);
  }
}