Good morning, everyone,

We are back in the world of home automation with a sensor that is quite original! A vibration sensor that also integrates an accelerometer!
But then why do you do it?
well I propose you to discover my 2 cases of very...... particular use!

Features of the Aqara vibration sensor

The Aqara vibration sensor is an intelligent device using the ZigBee wireless protocol with low power consumption and low cost.
Powered by a CR2032 battery and compliant with ZigBee's HA1.2 (home automation) standard.

Can interact with the Aqara multifunction gateway and other devices.
Used to monitor the condition of the door and windows, important elements alarmed, can also monitor the activity of the user's bed, helps to determine the quality of sleep.
Integrates a high-precision six-axis accelerometer and gyroscopes, used to collect vibration and external motion data.

The characteristics

• Brand: Aqara
• Model: DJT11LM
• Dimension and weight
• Product weight: 11,5 g
• Temperature: -10 to 50 ° C
• Product size (L xlxh): 3.60 x 3.60 x 3.60 x 0.90 cm
• Contents of packaging: 1 x intelligent motion sensor, 1 x user manual in English

Unboxing the Aqara vibration sensor

Gone are the days of white boxes, without description, with little or no information from the old Xiaomi range. With the Aqara range, we now have a more robust colour packaging, which makes the entire presentation more attractive! As the packaging is more intended for the Asian market, the name and description in traditional and simple Chinese, as well as Korean, are included, although the manual has more. The front side displays the product, the back side displays a typical use case (attached to a window). The sides are quite minimal in terms of information, and the bottom and top have the logo and basic specifications respectively.

The contents of the box include the sensor, a manual and a spare sticker, if you want to move the device, if you have already placed it somewhere. The units are delivered with a sticker already attached to the back of the unit. The CR2032 battery is supplied as standard.
This sensor, based on the design of the Aqara range, is really very small (36 x 36 x 9 mm).
It could almost be confused with the temperature and humidity sensor of the same range.

The manual is quite comprehensive and gives users instructions in English, Traditional Chinese and Simplified Chinese, German, French, Spanish, Russian, Japanese and Korean. Languages are therefore another improvement, compared to previous manuals in Chinese.

My use cases of the Aqara vibration sensor

Automatic staircase light switching on

Automatic light switching is good, but you can't always count on PIR presence detection.
In my case, I have the staircase for the floor that opens onto my living room. So I can't put a PIR detector down there to automatically turn on the light when you want to go up.
So I thought about putting this vibration sensor on the first step of the stairs to detect that someone is coming up.

Presence detection on my office chair

I had talked about it during my article on the domotization of my toilets, having children at home is often synonymous with light that stays on (even if these children are well learned)... I therefore set timers according to the presence of the rooms everywhere (see my article on automatic light in Jeedom).
Except that here it is, the presence detector has its limits... when I work at my desk I don't move enough for the PIR sensor to activate.
So I thought about putting this vibration and inclination sensor in my office chair!
In high sensitivity mode, this is perfect for determining if someone is on the seat!

Other cases in mind....
As it is called a "vibration sensor", it is quite obvious that it must detect vibrations, but it can do more. In addition to vibration detection, this could be caused by the dull noise of an object striking the surface on which this device is placed, it can also detect its inclination and even its fall.

The tilt option would probably be better suited for use with a lid box that can contain valuables; you would attach this to the underside of the lid, and if someone opened the box, the tilt sensor would be triggered.
Also in a more fun way, imagine your children's heads if you put this sensor in a candy box, and it triggers the siren of the Xiaomi gateway according to a time slot....

You can also imagine using the tilt sensor to detect the opening of a sectional garage door.

For the fall option, I admit that I'm drying on its use... tell me in comments if you have any, because I...

Regarding the vibration option and since the sensor can operate between -10 to 50 ° C, one could consider using it in a mailbox to determine if the factor has passed....

What is the purpose of a Aqara vibration sensor?

As always, Aqara products show their excellence in design, finish and overall quality. This motion and vibration sensor works very well. 
Once in the Mi Home application, it can be used for simple but effective scenarios. If you are a fan of the apple crunch, you can also use it in the Apple Homekit application (provided you have the Aqara gateway)

If you use it like me in Jeedom, I want to say that the possibility is endless... Just look at my twisted use cases above... who would have thought of putting a sensor on his office chair...

However, it should be noted that this sensor is not completely free of grievance.
Adjusting the low sensitivity is useless, and as mentioned above the average sensitivity is a little capricious in my cases. The high sensitivity, on the other hand, doesn't let anything pass... I've even read notices saying that the wind on a bay window triggered the collector.
The other point of vigilance is the positioning of the sensor, I found it less effective in a horizontal position (again in the case of the chair).