#include <Wire.h>

// Include the required Wire library for I2C<br>#include 

int x = 0;
int incomingByte = 0;   // for incoming serial data
const int buttonPin = A0; 
int buttonState = 0;
void setup() {
  // Start the I2C Bus as Master
   pinMode(buttonPin, INPUT);
  Wire.begin(); 
  Serial.begin(9600);
}
void loop() {

  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    // turn LED on:
    delay(500);
    digitalWrite(LED_BUILTIN, HIGH);
    delay(500);
    digitalWrite(LED_BUILTIN, LOW);
    delay(500);
    digitalWrite(LED_BUILTIN, HIGH);
    delay(500);
    digitalWrite(LED_BUILTIN, LOW);
    Wire.beginTransmission(9); // transmit to device #9
    Wire.write('3');              // sends 0 
    Wire.endTransmission();    // stop transmitting
  } else {
    // turn LED off:
    digitalWrite(LED_BUILTIN, LOW);
    Wire.write('3');
    Wire.endTransmission();    // stop transmitting
  }
  
  if (Serial.available() > 0) {
                // read the incoming byte:
                incomingByte = Serial.read();

                // say what you got:
                //Serial.println("I received: ");
               // Serial.println(incomingByte);  //, DEC
                Serial.write(incomingByte);
                Wire.beginTransmission(9); // transmit to device #9
                Wire.write(incomingByte);
                Wire.endTransmission();    // stop transmitting
        }
}