#include <Arduino.h>
#include "TinyWireS.h"

const byte SLAVE_ADDR = 100;
const byte LEDPIN = 3;  //PB3 on the ATtiny85 equates to "3" in Arduino terms
const byte BUTTONPIN = 4;  //PB4 on the ATtiny85 equates to "4" in Arduino terms

volatile boolean triggered = 0;

void setup() {
    TinyWireS.begin(SLAVE_ADDR);
    TinyWireS.onRequest(requestISR);
    pinMode(BUTTONPIN, INPUT_PULLUP);
}

void loop() {
  if(triggered == 0){
    if(digitalRead(BUTTONPIN) == LOW){
      triggered = 1;
      digitalWrite(LEDPIN, triggered);
    }
  }
  //check whether connected button was pressed, if so, send a signal via I2C to master node*/
}

void requestISR() {
  TinyWireS.write(triggered);        // sends five bytes
  triggered = 0;
  digitalWrite(LEDPIN, triggered);
}