Control Heatpump via Serial

[sfozz]

Hi Folks,

just trying to figure out how to get started with controlling a heatpump via a serial connection. I've found this blog entry which is my starting point. At the moment I'm unsure if I can connect the hardware serial of a pro mini to the heat pump and be able to debug it. Or would this require the use of a software serial port, or even springing for a board with more than one serial

Any pointers in the correct direction appreciated

sfozz

https://nicegear.nz/blog/hacking-a-mitsubishi-heat-pump-air-conditioner/

[bjacobse]

I use this setup:
https://www.domoticz.com/wiki/ESPEasy_Aircondition_Inverter_IR_control

check if your heatpumps protocol is supported:
https://github.com/ToniA/arduino-heatpumpir

[sfozz]

Hi,

So as I see it I would need to use the hardware serial for the connection to the heatpump and then create a software serial for debug messages. So something like this:

#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX

// Enable debug prints
#define MY_DEBUG
#define MY_DEBUGDEVICE mySerial
#define MY_BAUD_RATE 9600

So the next question is how to present the heatpump to the gateway. Would you create one child id and then define each type of sensor/metric or is there a one-to-one mapping:

#define CHILD_HVAC 0

MyMessage msgHvacStatu(CHILD_HVAC, V_STATUS); // Status: ON, OFF
MyMessage msgHvacSTemp(CHILD_HVAC, V_TEMP);    // Set Temp
MyMessage msgHvacRTemp(CHILD_HVAC, V_TEMP);    // Room Temp
MyMessage msgHvacFanSp(CHILD_HVAC, V_HVAC_SPEED);    // Fan Speed

or

#define CHILD_HVAC_STATUS 0
#define CHILD_HVAC_STEMP 1
#define CHILD_HVAC_RTEMP 2
#define CHILD_HVAC_FANSP 3

MyMessage msgHvacStatu(CHILD_HVAC_STATUS, V_STATUS); // Status: ON, OFF
MyMessage msgHvacSTemp(CHILD_HVAC_STEMP, V_TEMP);    // Set Temp
MyMessage msgHvacRTemp(CHILD_HVAC_RTEMP, V_TEMP);    // Room Temp
MyMessage msgHvacFanSp(CHILD_HVAC_FANSP, V_HVAC_SPEED);    // Fan Speed