mhi-ac-ctrl-esp32-c3

Control MHI Airconditioning locally with ESPHome!

This code is inspired by @absalom-muc's MHI-AC-Ctrl, @mriksman's esp32 homekit implementation and @ginkage's MHI-AC-Ctrl-ESPHome. Compared to the popular implementation of @absalom-muc and @ginkage, this repository uses the hardware SPI peripheral instead of a software based implementation. That improves reliability and frees up CPU resources for other tasks.

Hardware

Officialy supported (tested by @hberntsen):

• ESP-C3-32S(4M)-KIT. Requires an additional PCB for the AC interface. See the kicad folder folder for the PCB design (manufactured via Aisler).
• 2022 models of these indoor AC units:
  • SRK50ZS-W
  • SRK25ZS-W

Community supported:

• ESP32-C6
• Other ESP32-C3 boards (e.g. ESP32-C3 super mini). Note that the hardware SPI used in this project needs a GPIO loopback for the chip select. Connect two free GPIOs for that, like IO9 and IO10 in the schematic.
• The ESP32 has been reported to work. Make sure you use the right pins, as discussed in #11.
• The AC units listed at https://github.com/absalom-muc/MHI-AC-Ctrl?tab=readme-ov-file#prerequisites should work. Some older units have to use the use_long_frame: false setting.

Getting started

This project is used in ESPHome as external component. The ESPHome documentation will help you getting started with ESPHome. You can base off your configuration from the example.yaml included in this repository.

In general, the latest version of ESPHome should work. See the build workflow for the latest version of ESPHome that was tested.