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// LED pin number
#define LED_PIN 13

#define START_CODE ((char)0xA9)
#define END_CODE   ((char)0x9A)

static byte lastValue = 0;
static byte currentValue = 0;
//static const char onCmd[] = { START_CODE, 0x17, 0x2E, 0x00, 0x00, 0x00, 0x3F, END_CODE };
//static const char offCmd[] = { START_CODE, 0x17, 0x2F, 0x00, 0x00, 0x00, 0x3F, END_CODE };
static const char onCmd[] = "UUUUUUUU";
static const char offCmd[] = "UUUUUUUU";

s_pin txPin = 15;
unsigned long timestamp = 0;

#define INTERBIT_26_US_SLEEP delayMicroseconds(41); NOPS(23)
#define SET_TX_PIN(level) digitalWrite(txPin, level); INTERBIT_26_US_SLEEP

static void txByte(char b, bool parity)
{
  noInterrupts();
  // start bit
  SET_TX_PIN(LOW);
  // 8 data bits
  SET_TX_PIN(b & (1 << 0) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 1) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 2) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 3) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 4) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 5) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 6) ? HIGH : LOW);
  SET_TX_PIN(b & (1 << 7) ? HIGH : LOW);
  // parity
  SET_TX_PIN(parity ? HIGH : LOW);
  // stop bit
  NOPS(40); // compensate a bit for the lack of comparison
  SET_TX_PIN(HIGH);
  // for perfect bit timing we should wait some more here,
  // but we don't.
  interrupts();
}

static bool CalculateParity(byte b)
{
  bool parity = false;
  while (b) {
    parity = !parity;
    b = b & (b - 1);
  }
  return b;
}

static void TurnOnProjector()
{
  Serial.print("Turning on projector... ");
  for (int i = 0; i < 8; ++i) {
    txByte(onCmd[i], CalculateParity(onCmd[i]));
  }
  digitalWrite (LED_PIN, HIGH);
  Serial.println("done.");
}

static void TurnOffProjector()
{
  Serial.print("Turning off projector... ");
  for (int i = 0; i < 8; ++i) {
    txByte(offCmd[i], CalculateParity(offCmd[i]));
  }
  digitalWrite(LED_PIN, LOW);
  Serial.println("done.");
}

// next macro sets up the Z-Uno channels
// in this example we set up 1 switch binary channel
// you can read more on http://z-uno.z-wave.me/Reference/ZUNO_SWITCH_BINARY/
ZUNO_SETUP_CHANNELS(ZUNO_SWITCH_BINARY(getter, setter));

// this function runs only once the controller sends new value
void setter (byte value) {
  currentValue = value;
}

// this function runs only once the controller asks
byte getter () {
  return currentValue;
}

void setup() {
  Serial.begin();
  pinMode(LED_PIN, OUTPUT);
  pinMode(txPin, OUTPUT);
  currentValue = lastValue = 0;
}

void loop() {
  if(millis() - timestamp > 3000) {
    Serial.print("PING - ");
    Serial.println(timestamp);
    timestamp = millis();
  }
  if (lastValue != currentValue) {
    lastValue = currentValue; 
    if (currentValue > 0) {
      TurnOnProjector();
    }
    else {
      TurnOffProjector();
    }
    delay(3000);
  }
}