Custom devices (DiY) LYWSD03MMC in Home Assistant

Climate sensors · Zigbee · Xiaomi temperature & humidity sensor with custom firmware

Zigbee2MQTT Quirk included in ZHA 1 open report

This device is known to both Zigbee integrations: Zigbee2MQTT has a definition for it, and ZHA has a quirk that adapts it.

We have a detailed page on this device with compatibility ratings and prices. Details and compatibility

Brand: Custom devices (DiY)
Model: LYWSD03MMC
Device type: Climate sensors
Radio: Zigbee
Power: Battery
Reports itself as: LYWSD03MMC
Zigbee2MQTT: Device page on zigbee2mqtt.io

Where to buy

XIAOMI

Xiaomi Mi Temperatur- und Feuchtigkeitssensor mit 2 Stück, weiß, groß

1 offer

Offers for Xiaomi Mi Temperatur- und Feuchtigkeitssensor mit 2 Stück, weiß, groß, best price first, then sorted by total price
Shop	Offer	Price	Shipping	Delivery	Go to shop
	Xiaomi Mi Temperature and Humidity Monitor 2 Monitore zur Kontrolle der Temperatur und Luftfeuchtigkeit, Packung mit 2 Stück, weiß, groß	Price out of date		Nur noch 4 auf Lager	Check current price at Amazon.de

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How the device gets into Home Assistant

official ZHA – with a Zigbee coordinator and the ZHA integration; the quirk the device needs is part of ZHA.
add-on Zigbee2MQTT – Zigbee2MQTT runs as an add-on and passes the device on to Home Assistant over MQTT. Source

Known problems and fixes

Open problems

open Reported problem #179913 since 2026年8月23日 · Home Assistant #179913

ZHA quirks for this device

Quirk included in ZHA Recommended quirk

Part of ZHA – Home Assistant uses it on its own, nothing to install.

Adds: Temperature offset Humidity offset Comfort temperature min Comfort temperature max Comfort humidity min Comfort humidity max Display enabled Show smiley

Source: zha-device-handlers · since zha-quirks 2.2.2
Signature: Xiaomi / LYWSD03MMC

All quirks in the ZHA quirk database →

Alternatives

The same job from other makers – devices of the same type and radio that work with Home Assistant too.

Nedis ZBSC10WT Climate sensors · Zigbee, Wi-Fi · Temperature and humidity sensor Zigbee2MQTT Tuya Local (HACS) Custom quirk needed Review
Nous E6 Climate sensors · Zigbee · Temperature & humidity LCD sensor Zigbee2MQTT ZHA quirk 2 open reports Review
SONOFF SNZB-02 Climate sensors · Zigbee · Temperature and humidity sensor Zigbee2MQTT 1 open report Review
Tuya IH-K009 Climate sensors · Zigbee · Temperature & humidity sensor Zigbee2MQTT ZHA quirk 1 open report Review