int led = 3;
int button =2 ;
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
 pinMode(led, OUTPUT);
  pinMode(button, INPUT);
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {

if (Serial.available() > 0)
{
  char ledstate = Serial.read();
  if ( ledstate == '1')
  {
     digitalWrite(led, ledstate); 
  }
  if (ledstate =='0')
  {
   digitalWrite(led, LOW);
  } 
}
int buttonState = digitalRead(button);
if ( buttonState == HIGH) 
{
 Serial.println("Button is Pressed ");
}
}