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Connecting Zehnder Comfoair Q with Olimex ESP32-EVB

Before you start, make sure you have already flashed the firmware on the ESP32 board. If you haven't done that yet, please follow the instructions in the README.

Components

  • Olimex ESP32-EVB board
  • 5V power supply adapter
  • Any ethernet cable (RJ45 connector)
  • A micro USB cable to connect the board to your computer

updated MacOS driver for USB: https://github.com/WCHSoftGroup/ch34xser_macos

How

  1. Strip one side of the ethernet cable
  2. Connect the orange, white-orange, white-green wires to the ESP32-EVB board (see diagram + pictures below). Olimex CAN interface with cables
  3. Connect the other side of the cable to the RJ45 port of the ventilation unit (located at the top, behind the sliding cover). Zehnder RJ45

Connection diagram


|----------------+                                    +---------------+
|                |                                    |               |
|   [ComfoAir]   |                                    |  [ESP32-EVB]  |
|                |                                    |               |
|                |        +++++++++++++++++++++       |               |
|           RJ45 o--------|   (orange)  CAN-H o-------o   CAN-TX D5   |
|----------------+        | (w/orange)  CAN-L o-------o   CAN-RX D35  |
                          |  (w/green)    GND o-------o GND           |
                          +++++++++++++++++++++       +---------------+

Olimex ESP32-EVB board vs ESP32

  • ESP32-EVB connects to the RJ45 port on the ventilation unit
    • ESP32-EVB uses the CAN pin numbers GPIO_NUM_35 (CAN-RX) + GPIO_NUM_5 (CAN-TX) instead of GPIO_NUM_5 + GPIO_NUM_4
  • CAN interface is built-in, so no need for soldering or additional hardware
  • Requires a separate 5V power supply, whereas the ESP32 can be powered via the 12V supply of the ventilation unit (but separate power supply can be more reliable)
  • Also, you can get a metal box case from Olimex, so no need for 3D printing