const int buttonPin = 4;  // the number of the pushbutton pin
const int ledpin = 16;  // the number of the pushbutton pin
int buttonState = 0;

void setup() {
 // put your setup code here, to run once:
 Serial.begin(115200) ;
pinMode(ledpin, OUTPUT);
pinMode(buttonPin, INPUT);


void loop() {
 // put your main code here, to run repeatedly:
buttonState = digitalRead(buttonPin);
 Serial.println(buttonState);

if (buttonState == HIGH){
digitalWrite(ledpin, HIGH) ;
} else{
digitalWrite(ledpin, LOW) ;
 }
}