# Cooper Hunter AC: UART and infrared protocol investigation

> Cooper Hunter AC documents the COM1 UART and infrared control messages of CH-IF140RK and CH-IF140RK2 units with a Gree GRZQ3-R V1 board. The author inferred UART status fields by comparing packets while operating the infrared remote. The resulting ESPHome design receives UART status and sends control through an infrared signal path.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-06
- Original resource: <https://github.com/kronhait/cooper-hunter-ac-esphome>
- Primary source: <https://github.com/kronhait/cooper-hunter-ac-esphome/blob/aceab67f8621e5e17c52ffbbb9a7964524b79783/README.md>
- Catalog page: <https://awesomerea.org/resources/cooper-hunter-ac-protocol-case/>
- Record JSON: <https://awesomerea.org/resources/cooper-hunter-ac-protocol-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/cooper-hunter-ac-protocol-case/index.md)

## Requirements & limits

- **Prerequisites:** Cooper Hunter CH-IF140RK or CH-IF140RK2 with the documented Gree GRZQ3-R V1 board, plus an ESP32 running ESPHome for the described setup.
- **Scope:** The final wiring uses UART receive only; control uses infrared signal injection.
- **Limits:** Some protocol fields are marked tentative in PROTOCOL.md.
- **License:** MIT license.

## Primary sources

1. <https://github.com/kronhait/cooper-hunter-ac-esphome/blob/aceab67f8621e5e17c52ffbbb9a7964524b79783/README.md>
2. <https://github.com/kronhait/cooper-hunter-ac-esphome/blob/aceab67f8621e5e17c52ffbbb9a7964524b79783/PROTOCOL.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.