If you need to install the MQTT version just browse this repo with tag last-mqtt.

This software script let you use a ESP32 + CAN Transceiver to interact with the Comfoair Q 350 unit.

It does expose all known informations through ESPHOME and let you control the air flow via Home Assistant as well.

It does allow you to integrate the unit on Home Assistant as depicted below:

Inside the docs/pcb folder you can find both gerber file and BOM. Files are provided as is. It's up to you to check data and schematic correctness.

This repository is meant to be working with the custom pcb above. But you can always buy components separately such as Waveshare SN65HVD230 and a voltage regulator as well as an ESP32 of your choice and it will work.

The pcb will look like this once soldered and mounted.

Prerequisites for custom build:

• ESP32 -> link
• DC-DC converter -> link
• RJ45 Female -> link
• Can Transceiver -> Waveshare SN65HVD230

• Some ethernet cable

Here a simple schematic. made by @mat3u

---------------+        +---------------+                 +-------------+
(oran/red)12V  o--------o IN+      OUT+ o-----------------o VIN         |
               |        |   [LM2596S]   |                 |             |
(brown)   GND  o--------o IN-      OUT- o-----------------o GND         |
               |        +---------------+                 |             |
    [RJ45]     |                                          |   [ESP32]   |
  [ComfoAir]   |                                          |             |
               |        +-------------------------+       |             |
(w/blue) CAN_L o--------o CAN_L               3v3 o-------o 3v3         |
(blue)   CAN_H o--------o CAN_H               GND o-------o GND         |
---------------+        |                         |       |             |
                        |   [SN65HVD230]   CAN TX o-------o 25          |
                        |                  CAN RX o-------o 21          |
                        +-------------------------+       +-------------+

To include this repo use the external_components configuration like so:

# ...
external_components:
  - source: github://vekexasia/comfoair-esp32
    components: [ comfoair ]

comfoair:

# ...

The component exposes 2 services.

• comfoair_send_command
• comfoair_send_hex

NOTE: the prefix could differ depending on your esphome device name.

comfoair_send_command: allows one "command" parameter. The value of the param can be one of the following pre-bundled commands:

• ventilation_level_0
• ventilation_level_1
• ventilation_level_2
• ventilation_level_3
• boost_10_min
• boost_20_min
• boost_30_min
• boost_60_min
• boost_end
• auto
• manual
• bypass_activate_1h
• bypass_deactivate_1h
• bypass_auto
• ventilation_supply_only
• ventilation_supply_only_reset
• ventilation_extract_only
• ventilation_extract_only_reset
• temp_profile_normal
• temp_profile_cool
• temp_profile_warm

In case you need more flexibility you can use the comfoair_send_hex service like follows:

service: esphome.comfoair_send_hex
data:
  hexSequence: "8415070100000000100e000000"

^^ the above is equivalent to ventilation_extract_only (which has an inner timer of 1h)

A lot of this repo was inspired by the reverse engineering here. If you'd like to know more how the unit communicates, head over

• here
• and here

There's also a Node.JS version with a Raspberry PI here