arduino-heatpumpir/CarrierHeatpumpIR.cpp

#include <CarrierHeatpumpIR.h>

CarrierHeatpumpIR::CarrierHeatpumpIR() : HeatpumpIR()
{
  static const char PROGMEM model[] PROGMEM = "carrier";
  static const char PROGMEM info[]  PROGMEM = "{\"mdl\":\"carrier\",\"dn\":\"Carrier\",\"mT\":17,\"xT\":30,\"fs\":6}";

  _model = model;
  _info = info;
}


void CarrierHeatpumpIR::send(IRSender& IR, uint8_t powerModeCmd, uint8_t operatingModeCmd, uint8_t fanSpeedCmd, uint8_t temperatureCmd, uint8_t swingVCmd, uint8_t swingHCmd)
{
  (void)swingVCmd;
  (void)swingHCmd;

  // Sensible defaults for the heat pump mode

  uint8_t operatingMode = CARRIER_AIRCON1_MODE_HEAT;
  uint8_t fanSpeed = CARRIER_AIRCON1_FAN_AUTO;
  uint8_t temperature = 23;

  if (powerModeCmd == POWER_OFF)
  {
    operatingMode = CARRIER_AIRCON1_MODE_OFF;
  }
  else
  {
    switch (operatingModeCmd)
    {
      case MODE_AUTO:
        operatingMode = CARRIER_AIRCON1_MODE_AUTO;
        break;
      case MODE_HEAT:
        operatingMode = CARRIER_AIRCON1_MODE_HEAT;
        break;
      case MODE_COOL:
        operatingMode = CARRIER_AIRCON1_MODE_COOL;
        break;
      case MODE_DRY:
        operatingMode = CARRIER_AIRCON1_MODE_DRY;
		fanSpeedCmd = FAN_AUTO; // Fan speed is always 'AUTO' in DRY mode
        break;
      case MODE_FAN:
        operatingMode = CARRIER_AIRCON1_MODE_FAN;
        temperatureCmd = 22; // Temperature is always 22 in FAN mode
        break;
    }
  }

  switch (fanSpeedCmd)
  {
    case FAN_AUTO:
      fanSpeed = CARRIER_AIRCON1_FAN_AUTO;
      break;
    case FAN_1:
      fanSpeed = CARRIER_AIRCON1_FAN1;
      break;
    case FAN_2:
      fanSpeed = CARRIER_AIRCON1_FAN2;
      break;
    case FAN_3:
      fanSpeed = CARRIER_AIRCON1_FAN3;
      break;
    case FAN_4:
      fanSpeed = CARRIER_AIRCON1_FAN4;
      break;
    case FAN_5:
      fanSpeed = CARRIER_AIRCON1_FAN5;
      break;
  }

  if ( temperatureCmd > 16 && temperatureCmd < 31)
  {
    temperature = temperatureCmd;
  }

  sendCarrier(IR, operatingMode, fanSpeed, temperature);
}

// Send the Carrier code
// Carrier has the LSB and MSB in different format than Panasonic

void CarrierHeatpumpIR::sendCarrier(IRSender& IR, uint8_t operatingMode, uint8_t fanSpeed, uint8_t temperature)
{
  uint8_t sendBuffer[9] = { 0x4f, 0xb0, 0xc0, 0x3f, 0x80, 0x00, 0x00, 0x00, 0x00 }; // The data is on the last four uint8_ts

  static const uint8_t temperatures[] PROGMEM = { 0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e, 0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b };
  uint8_t checksum = 0;

  // PROGMEM arrays cannot be addressed directly, see http://forum.arduino.cc/index.php?topic=106603.0
  sendBuffer[5] = pgm_read_byte(&(temperatures[(temperature-17)]));

  sendBuffer[6] = operatingMode | fanSpeed;

  // Checksum

  for (int i=0; i<8; i++) {
    checksum += IR.bitReverse(sendBuffer[i]);
  }

  // There's something really strange with the checksum calculation...
  // With these many of the codes matchs with the code from the real Carrier remote
  // Still certain temperatures do not work with fan speeds 1, 2 or 5

  switch (sendBuffer[6] & 0xF0) {
  case 0x00: // MODE_AUTO - certain temperature / fan speed combinations do not work
    checksum += 0x02;
    switch (sendBuffer[6] & 0x0F) {
      case 0x02: // FAN1
      case 0x03: // FAN5
      case 0x06: // FAN2
        checksum += 0x80;
        break;
    }
    break;
  case 0x40: // MODE_DRY - all settings should work
    checksum += 0x02;
    break;
  case 0xC0: // MODE_HEAT - certain temperature / fan speed combinations do not work
    switch (sendBuffer[6] & 0x0F) {
      case 0x05: // FAN4
      case 0x06: // FAN2
        checksum += 0xC0;
        break;
    }
    break;
  case 0x20: // MODE_FAN - all settings should work
    checksum += 0x02;
    switch (sendBuffer[6] & 0x0F) {
      case 0x02: // FAN1
      case 0x03: // FAN5
      case 0x06: // FAN2
        checksum += 0x80;
        break;
    }
    break;
  }

  sendBuffer[8] = IR.bitReverse(checksum);

  // 40 kHz PWM frequency
  IR.setFrequency(40);

  // Header
  IR.mark(CARRIER_AIRCON1_HDR_MARK);
  IR.space(CARRIER_AIRCON1_HDR_SPACE);

  // Payload
  for (size_t i=0; i<sizeof(sendBuffer); i++) {
    IR.sendIRbyte(sendBuffer[i], CARRIER_AIRCON1_BIT_MARK, CARRIER_AIRCON1_ZERO_SPACE, CARRIER_AIRCON1_ONE_SPACE);
  }

  // Pause + new header
  IR.mark(CARRIER_AIRCON1_BIT_MARK);
  IR.space(CARRIER_AIRCON1_MSG_SPACE);

  IR.mark(CARRIER_AIRCON1_HDR_MARK);
  IR.space(CARRIER_AIRCON1_HDR_SPACE);

  // Payload again
  for (size_t i=0; i<sizeof(sendBuffer); i++) {
    IR.sendIRbyte(sendBuffer[i], CARRIER_AIRCON1_BIT_MARK, CARRIER_AIRCON1_ZERO_SPACE, CARRIER_AIRCON1_ONE_SPACE);
  }

  // End mark
  IR.mark(CARRIER_AIRCON1_BIT_MARK);
  IR.space(0);
}