Case study

ha-c14: reconstructing the C14 ventilator bus protocol

ha-c14 documents the C14 RS-485 bus between a COMPIT AERO 3B ventilator and Nano Color CTP room panel and implements an ESPHome bridge for ESP32. Its protocol notes describe 30-byte frames, master cycles and device roles; the YAML package parses frames and exposes controls and sensors to Home Assistant.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-07
Evidence class: C2 code & docs, no demo or download

Stars: 7
Last commit: 2026-07-03

GitHub data as of 2026-11-10

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Evidence

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

How evidence classes are assigned

Requirements & limits

Prerequisites: An ESP32-compatible board and a 3.3 V RS-485 interface connected to the C14 bus are required.
Prerequisites: ESPHome and Home Assistant are used for the provided integration.
Limits: Protocol reverse engineering is ongoing and some fields remain unresolved.
License: Documentation is CC BY-SA 4.0; firmware code is MIT.

Cite

BibTeX

@misc{ha-c14-case,
  title = {{ha-c14: reconstructing the C14 ventilator bus protocol}},
  howpublished = {\url{https://github.com/Pioszym/ha-c14}},
  url = {https://github.com/Pioszym/ha-c14},
  urldate = {2026-11-07},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ha-c14-case/}}
}

Plain text

ha-c14: reconstructing the C14 ventilator bus protocol. https://github.com/Pioszym/ha-c14 (accessed 2026-11-07). Awesome REA entry: https://awesomerea.org/resources/ha-c14-case/

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About this entry

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Primary sources

PROTOCOL.md GitHub · Pioszym/ha-c14 · Revision 3746e03
README.md GitHub · Pioszym/ha-c14 · Revision 3746e03