Case study

esphome-panasonic-erv: local control through a reconstructed CN12 protocol

esphome-panasonic-erv replaces a Panasonic ERV's optional module with an ESP32-S3 that speaks the reconstructed CN12 serial protocol. Logic-analyzer captures underpin its frame decoder, command builder and ESPHome component for power, mode and fan control. It exposes state to Home Assistant, which can make the controls available through its HomeKit Bridge. The author reports physical testing on FY-25ZDP1C.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 20
Last commit: 2026-06-28
Language: C++
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-09

How evidence classes are assigned

Requirements & limits

Prerequisites: An ESP32-S3 board, jumper wires and ESPHome are required; the board connects to the ERV's CN12 port in place of the OEM module.
Testing evidence: The author reports physical testing on FY-25ZDP1C; other listed models remain untested.
Scope: The component implements thin-domestic power, mode and fan controls; additional functions of larger units are outside its current scope.
License: MIT license.

Cite

BibTeX

@misc{esphome-panasonic-erv-case,
  title = {{esphome-panasonic-erv: local control through a reconstructed CN12 protocol}},
  howpublished = {\url{https://github.com/ShadowZZP/esphome-panasonic-erv}},
  url = {https://github.com/ShadowZZP/esphome-panasonic-erv},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/esphome-panasonic-erv-case/}}
}

Plain text

esphome-panasonic-erv: local control through a reconstructed CN12 protocol. https://github.com/ShadowZZP/esphome-panasonic-erv (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/esphome-panasonic-erv-case/

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About this entry

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Primary sources

docs/PROTOCOL.md GitHub · ShadowZZP/esphome-panasonic-erv · Revision 3470015
README.md GitHub · ShadowZZP/esphome-panasonic-erv · Revision 3470015
LICENSE GitHub · ShadowZZP/esphome-panasonic-erv · Revision 3470015