#include "Arduino.h"
#include <TinyPower.h>
#include <Tiny.h>

// Pins
#define SWITCH 0
#define SENDER 2

ContactSensor sensor = ContactSensor(LIGHT_SENSOR, SENDER);

void setup() {

  pinMode(SWITCH, INPUT_PULLUP);

  sensor.setup();

  sensor.sendStateAndVoltage(readState());

  TinyPower::setup();
}

void loop() {
  TinyPower::sleep();
}

boolean readState() {
  return digitalRead(SWITCH);
}

ISR(PCINT0_vect) {
  sensor.sendStateAndVoltage(!readState());
}