#include <SoftwareSerial.h>
SoftwareSerial mySerial(0, 1);

const int buttonPin = 3;     // the number of the pushbutton pin
const int ledPin =  7;      // the number of the LED pin
int buttonState = 0;         // variable for reading the pushbutton status


void setup() {
  mySerial.begin(115200); 
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState ==  LOW ) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
     mySerial.write(1);
  } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
       mySerial.write(2);
  }
}