#include <Wire.h>

int buttonState;

void setup() {
  // put your setup code here, to run once:
  Wire.begin(7);
  Serial.begin(115200);
  Wire.onRequest(requestEvent);
  Wire.onReceive(receiveEvent);
  pinMode(0, INPUT);
  pinMode(48, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(0) == LOW) {
    buttonState = 1;
  } else {
    buttonState = 0;
  }
 
}
void requestEvent() {
  Serial.println("sending");
  Wire.write(buttonState);
}
void receiveEvent(int x) {
  //Serial.println("receiving");
  digitalWrite(48, !Wire.read());
}