const int buttonpin =4;
const int ledpin = 5;
int buttonstate = 0;
void setup() {
  // put your setup code here, to run once:
  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);
 }
}