const int buttonPin=4;//the number of the pushbutton
const int ledPin=5;
//variable for storing the pushbutton status
int buttonState=0;
void setup(){
  Serial.begin(115200);
  //initialize the pushbutton pin as input
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
}
void loop(){
  buttonState=digitalRead(buttonPin);
  Serial.println(buttonState);
  if(buttonState==HIGH){
    //turn on LED
    digitalWrite(ledPin, HIGH);
  }else{
    //turn off led
    digitalWrite(led, LOW);
  }
}