#define push_btn 2
#define led 7
// C++ code
//
void setup()
{
  pinMode (push_btn, INPUT);
  pinMode (led, OUTPUT);
  Serial.begin(9600);
  
}

void loop()
{
  int btn_state = digitalRead(push_btn);
  Serial.println(btn_state);

  if ( btn_state==1){
  digitalWrite(led, HIGH);
   } else {
    digitalWrite(led, LOW);
}

  delay(250);
}