Xiaomi Mijia - Bluetooth LCD temperature / humidity sensor

4 minutes of reading
Proconductor: Xiaomi
Category: Sensore
Type: Sensorand temperature and relative humidity
Technology: Wi-Fi / Bluetooth Low Energy
Installation difficulties: Bassa
Ease of use: Alta
Availability: Amazon
Review review: 1.3
Xiaomi Mijia LCD Bluetooth Thermometer / Hygrometer - Front

Xiaomi Mijia LCD temperature and relative humidity sensor (Line Xiaomi Smart Home) is a small dedicated internal sensor appgreasy to the detection of these environmental metrics at our home automation site.

It differs from other temperature sensors in the fact of possessing, in addition to the detection functionality, a comfortable LCD display Useful to instant reading of the data collected. It therefore allows us to provide our home automation with timely surveys and to operate at the same time as a common wall thermometer.

Xiaomi Mijia LCD Bluetooth Thermometer / Hygrometer - Dimensions

The dimensions don't scare: with a diameter of six centimeters and one prothe two Xiaomi Mijia LCD thermometer / hygrometer can be set in any environment without ruining the aesthetics. The design is compact, essential, very elegant.

The resolution of the reading is precise to the tenth of a degree both on the temperature and on the percentage of relative humidity. The surveys are carried out every second. In terms of precision, he surprised us: compared to a precision thermometer, we found a gap + 0.1 degrees centigrade on temperature and + 0,5% on relative humidity. Unlike of the younger brother, does not have a reading relative to barometric pressure.

Il proThe communication protocol offered is Bluetooth LE, which guarantees low power consumption; power is guaranteed from a AAA battery, whose estimated duration is about a year.

Xiaomi Mijia temperature sensor: Bluetooth LCD humidity - size


The theme related to compatibility it's enough articulated.

First of all it is important to know that, as a component of the line Xiaomi Smart Home, the sensor is manageable through theapp "Xiaomi Mi Home" (For Android e iOS). To add to the sensor configuration it is sufficient to have the Bluetooth active on the phone / tablet and, once theapp, select on “add device": The sensor will come automatically detected and added to the configuration. At this point it will be possible to read the readings, through theapp, when you will be in its vicinity.

To receive them also "remotely" (ie from outside the home) it is instead necessary to own a BRIDGE/Gateway connected to the internet. Most scafati they will instinctively think of the classic Gateway Xiaomi, but unfortunately it is not so: this gatewayin fact, it does not offer (in addition to connectivity Wi-Fi which allows him to connect to the Internet) connectivity Zigbee (useful for connecting sensors like that of flooding, of opening, of smoke etc.) but only Bluetooth. Therefore, if the choice is to read the sensor remotely using theapp "Xiaomi Mi Home", then it will be necessary to have a gateway Xiaomi Bluetooth>Wi-Fi or ... a lamp.

Yes, because today the only Xiaomi device that offers this functionality is the Xiaomi bedside lamp, which in addition to acting as a lamp (obvious) also offers this functionality gateway Bluetooth>Wi-Fi.

Essentially the LCD sensor connects via Bluetooth to the gateway-lamp, which in turn connects via the Internet to the cloud to which theapp "Xiaomi Mi Home" and from there the game is done. This obviously allows to define, always through theapp, to create automation rules for other Xiaomi components already registered at theapp.

The alternative for remote control (and other aspects) there, and is explained in the following paragraph.

To date the Xiaomi Mijia Bluetooth LCD thermometer / hygrometer supports Google Home (Assistant) (although in a limited manner), while full compatibility with Amazon Echo (Alexa) is not guaranteed. These aspects can also be solved, we will talk about them later.
IFTTT not received.

Domotics integrability

Also the theme integration home automation is no joke.

Let's start with Home Assistant.
A high degree of compatibility It's guaranteed from an ad hoc daughter platform of the component "Sensor"Able to register in a way direct the sensor via a connection direct via Bluetooth - which means no need for any gateway Bluetooth>Wi-Fi (the lamp above) additional. It is also necessary that the hardware on which it turns Home Assistant is equipped with 4.0 Bluetooth antenna, otherwise the obvious impossibility of connecting directly to the device. No proproblem in this sense for those who use it Raspberry Pi.

Once integrated into the configuration (GUIDA), in LCD sensor Bluetooth generates at Home Assistant three entity of "sensor" type:

  • temperature;
  • humidity;
  • battery,

the latter useful for monitoring the consumption status of the AAA battery which powers the Bluetooth LCD sensor.
To implement this integration we have made available an ad hoc guide.

Alternatively (but it is a conjecture of ours) to direct integration via Bluetooth, let's imagine it is possible - since the component "Xiaomi Gateway Aqara"Of Home Assistant list in the supported devices a generic entry "Gateway”- survey the sensor in a way indirect, or censoring the eventual gateway Bluetooth>Wi-Fi (the lamp above) away Wi-Fi and inheriting the elements connected to it (then the LCD thermal sensor). This conjecture is born from the type of integration which is done with BRIDGE/Gateway Zigbee↔︎TCP/IP, integration that allows to survey in a way indirect su Home Assistant all the sensors / devices / actuators connected via Zigbee al BRIDGE, which in turn integrates so direct toHUB personal.

Of the veracity of this (sensible) conjecture we have no confirmation to date. Otherwise it would not be a conjecture.

For Homebridge, there is a Plugin appTeddy for integration direct via Bluetooth (GUIDA). This integration makes the sensor compatible Appthe HomeKits. Of course, the same is true of the presence of a Bluetooth antenna made for Home Assistant.

Also openHAB seems to be able to integrate the sensor, not so much with a add-on dedicated as much as through the more generic Bluetooth binding (usually for the antenna).

Domoticzfinally, it does not seem to be able to integrate this sensor, in fact no components seem to be available for this purpose.


Detailed evaluation:

Constructive quality
Use: quality and experience
Xiaomi Mijia - temperature sensor: Bluetooth LCD humidity - Buy on AmazonIf the need is to have a good temperature and relative humidity sensor for interiors to be integrated into profirst personal domotics that is economical, precise and versatile and, finally, can be consulted at a glance, then this Xiaomi sensor is right for you proprio.

As explained above, it is indeed a good device because it's cheap, it's precise, it's beautiful (but this is obviously subjective) and presents, above all, an excellent degree of integrability towards our loved ones HUB personal, which allows him to integrate in a transparent and functional way. Furthermore, the high degree of integrability also guarantees the use of the sensor with the most common smart speakers (approfoundation on the topic).

The only flaw, the lack of support Wi-Fi or at least Zigbee but, however, as explained above, the presence of Bluetooth makes the sensor equally versatile and usable so full.

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