# devbis/z03mmc

Xiaomi LYWSD03MMC Zigbee Firmware

Repository: https://github.com/devbis/z03mmc
Canonical: https://ross.abutalabs.com/products/z03mmc
Language: C
License: GPL-3.0
License Family: copyleft
Topics: humidity-sensor, lcd-display, lywsd03mmc, temperature-sensor, zigbee, ota
Last push: 2026-01-07T10:09:06+00:00

## Health v2 (maintenance only)
Score: 50/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 61, release rhythm 8, longevity 100
- inputs: {"age_days": 1667, "days_push": 238, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1462, forks 65 (observed 2026-08-28T04:04:47.610187+00:00)

## What it is
Open-source Zigbee 3.0 firmware for the Xiaomi LYWSD03MMC Bluetooth temperature and humidity sensor, written in C for Telink hardware. It converts the stock BLE sensor into a Zigbee device with battery, temperature, and humidity clusters, plus LCD support and OTA updates.

## Use cases
- convert Xiaomi LYWSD03MMC sensor to Zigbee
- flash custom firmware to LYWSD03MMC over the air
- integrate temperature and humidity sensor into Zigbee home automation
- update sensor firmware via OTA
- flash firmware via USB-UART to Telink sensor
- replace stock Bluetooth firmware with Zigbee firmware

## When to choose
- you want to use LYWSD03MMC sensors with a Zigbee coordinator like Zigbee2MQTT or ZHA
- you prefer Zigbee over Bluetooth for sensor connectivity
- you need OTA firmware updates for your sensors

## When to avoid
- you want to keep using Bluetooth/Home Assistant BLE integration
- you have sensor hardware revisions not supported by the firmware
- you are not comfortable flashing firmware with risk of bricking the device

## Facets
- artifact type: library
- maturity: active
- function: embedded, iot
- domain: iot, embedded-systems
- platform: embedded, iot
- tags: zigbee, firmware, temperature-sensor, humidity-sensor, xiaomi, lywsd03mmc, ota, telink

## Member repositories
- devbis/z03mmc (main) score 50

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:47.610187+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:35:16.534954+00:00, confidence not recorded.
  - readme: https://github.com/devbis/z03mmc (fetched 2026-08-28T04:04:47.610187+00:00, sha 7401de0d4711)
- Data as of 2026-08-30T08:39:29.467469+00:00.