Wireless motion sensor for Xiaomi smart home - scenarios, settings. How to build a smart home

Smart home sensors work on the same principle: they transmit a signal via wi-fi to the base module, a box the size of a home router. The base module goes online and communicates with the smartphone. All sensors can be controlled through a mobile application from anywhere where there is access to the network.

Why don't the sensors themselves go online, why do we need a base module? Lots of sensors. Imagine that ten people came to your house, and they all connected to wi-fi. Some networks will survive, some won't. Add family members' devices—smartphones, laptops, desktops, tablets... To manage such a busy network, you'll need a personal system administrator, just like in the office. The base module distributes the channels so that the radio waves on which everyone communicates electronic devices in the house, do not interfere with each other.

Sensors for water leaks, opening and closing doors, smoke, cameras and motion sensors are connected to the central module, which communicates with you via the Internet through a mobile application.

Here are five smart home features that can make life easier and more enjoyable.

1. Remote control of outlets

Did I turn off the iron?

Buy an iron that turns itself off. Take a photo of the iron as you leave the house. Check all sockets. Call households and neighbors, ask to check. Or put a "smart" outlet. It looks like a transition. If you suddenly doubt that you removed the plug when leaving home, you can open the circuit with a few passes across the smartphone screen - and for sure save the house from a fire, and yourself from unnecessary worries.

If there are children at home, a smart socket becomes even more useful. It will help when the smoke detector (it can also be made part of the “smart home”, we will talk about it later) is triggered in the room where electrical appliances are working. It’s far from home, you are at work or on vacation, what happened is unknown, but you can remotely de-energize the room. Balm for the soul.

The white adapter with LED is the smart socket. It is controlled from a mobile application: one press of a button, and the socket is de-energized.

Some smart plugs also save you money. They work like a counter, whose indicators you see in mobile application. Is the appliance winding too many kilowatts? Disable! It is convenient if you forgot to turn off the underfloor heating or other energy-intensive device when leaving your dacha.

2. Fire alarm

you have something on fire

Fire alarms are complex and expensive. A smoke detector connected to the system " smart House" - it's simple. It is mounted under the ceiling, connects to the base in five minutes and works for 12 months until it's time to change the battery. The sensitivity is adjusted so that the siren does not turn on from burnt cutlets or cigarette smoke in a frying pan, but it feels serious smoke. If the room fills with smoke, you will know immediately: notifications will come to email and push notification, and a loud siren will howl in the room.

A wireless smoke detector connected to the central unit will alert you to smoke wherever you are.

3. Water leakage sensors

Haven't we flooded the neighbors?

The third major fear of a householder is water leakage. An unreliable pipe joint, a weakened faucet, and just an overflowing bath. Or your apartment is empty. What if they have already given heating, and the battery has flowed? Put water leakage sensors in the most insidious places. They do not react to small splashes, only to serious incidents. The notification will be emailed and displayed on the screen. True, the sensor will not be able to do anything with the leak - you will have to go and save everything. But it's better to do it as soon as possible.

An added bonus: the leak sensor is made wireless. Wires and water are poorly compatible things, and they also get in the way under your feet. A wireless device the size of a cake "basket" can be fixed anywhere. And don't forget to change the batteries.

The water leakage sensor notifies you of troubles - leaking pipes and an overflowing bath.

4. Open / close sensors

Did I close the door?

When leaving the house, turn the key and pull the handle a couple of times: this habit will help you not to worry about whether you (or forgetful guests and children) have left everything wide open. But in order not to rely on the fragile human memory, you can put a magnetic sensor for closing or opening doors. Then notifications will come when the door is opened or closed. The same can be done with windows. The main thing is to turn off the sensor on a day when you expect a lot of guests.

Even if you never forget to close the door, the sensor will come in handy to monitor the children.

5. Cameras, motion sensors

Monitor and protect

If in the 90s your neighbor had a camera mounted in a peephole on a heavy iron door, then your neighbor was a difficult person. A camera can now be installed with much less effort and expense than it did twenty years ago, and it doesn't look like you have suitcases of currency in your bedroom. You can connect cameras, microphones (and cameras with a microphone, and even with a speaker) and motion sensors to the "smart home". Set the motion sensor so that it reports the movement of a person, but ignores the cat. You can record, or you can watch live - just like that, just in case. Modern "smart" cameras have a passive mode: they start recording only when they sense movement. Some cameras also see at night, in the infrared range.

A small wi-fi camera monitors everything that happens around and reports to you around the clock. She also sees in the infrared range - which means not only during the day; most of these devices have a microphone and speaker.

Pleasant trifles

Not vital, but nice smart home features

The motion sensor is installed not only for security purposes. Recently, Muscovite Konstantin Konovalov lowered such a device into, and now he receives notifications on his smartphone when the postman brings a receipt for payment utilities or postal notice. Or the latest issue of Popular Mechanics by subscription. Some tricksters put a portable home camera over the pot in which the dumplings are boiled - to see how they float up while they rest in another room.

"Smart" lamps are lighting control from the smartphone screen. Even a child can adjust the color, turn it on or off.

Once you start optimizing, it's hard to stop. You can stick a moisture sensor into the flower pot and remember to water it. You can install a “smart” air quality controller in the nursery and do not forget to ventilate. Humidity can also be controlled in the same way. Last but not least, smart bulbs eliminate the need to get up to turn off the lights. This can be done without letting go of the smartphone.

"Smart home" is a remote control remote control to all electrical appliances in the house. Some features make life a little more pleasant, others save you from serious everyday problems. Russian market"smart" consumer electronics not yet very developed. One of the pioneers is MegaFon: it offers "Security" or "Basic" sets, which can be supplemented according to personal preferences and needs. Each set includes a control center and compatible wireless devices - cameras and sensors; however, you can choose individual devices to your taste.

Human interaction with environment, including to perform certain actions, occurs with the help of the senses. By implementing a "smart home", we automate many processes and save a person from routine operations, while there are two ways to go:

• The first involves programming the equipment to operate in certain moments time (by timer) or at the initiative of the user (by pressing a key). This method finds its application in "smart" automation, but there is also another one that gives more freedom.Use of sensors.
• In this case, the sensors act as a kind of "sense organs" that inform the system about the occurrence of a certain event, after which the "brain" (controller), in turn, gives the necessary commands to the devices that perform a particular function.

In our review, we will consider two types of sensors or sensors. Some of them register movement and respond to it (motion sensors), others react to the presence of a person in the room (presence sensors).

The difference between the two types of sensors

Faced with the descriptions of various sensors, one can see their division into two groups:

• motion sensors;
• presence sensors.

What is the difference between motion and presence sensors? Basically, they are similar devices. The difference is only in sensitivity. The motion sensor is triggered by a fairly active movement of the object, while the presence sensor can respond to the smallest human movements: the movement of a hand lying on a computer mouse, a subtle shake of the head, and even breathing. An important point for presence sensors is a situation in which a person who enters the room for some time remains completely without movements that can be fixed. To avoid switching on/off errors, the device has a response delay setting. Thanks to this, 100% compliance with the moment of turning on or off the devices is achieved. The situation is similar with the motion sensor installed in the walk-through areas.

How does it work in an example?
Let's say there is an office, the lighting in which is turned on by presence sensors. In this case, it would be reasonable to set the sensor response delay to 5-10 minutes. During this time, even if no movement is detected in the room with people, the sensor will not work, since the delay time has not yet expired. If everyone left the office, then exactly 10 minutes later, when the delay time expires, and there will be no movement in the room, the sensor will do its job and the light will be turned off. In small rooms, the delay can be several seconds.

Sensor parameters

The principle on the basis of which the presence of motion is detected by the sensor is based on the effect of human thermal radiation, which is in the infrared invisible to the eye zone of the spectrum. Via special element the sensor determines passive infrared radiation (PIR) and its change, on the basis of which an electrical signal (or radiotelegram) is generated that turns on or off devices (most often lighting), and also changes the parameters of their operation by any actuating radio device of a switch or dimmer. A logical question: How will such a sensor react to pets? After all, the heat emanating from them will also be recorded by the device? Yes, this is true, but with the help of sensitivity settings, they ensure that, for example, the sensor does not react only to animals weighing less than 15 kg. In this case, your dog or cat running in the coverage area will not trigger.

Thermal radiation is inherent not only to living beings, but also to lamps, heaters, and the sun. Therefore, in order to avoid interference and false alarms, when placing sensors, it is necessary to take into account the location of heating devices and prevent direct sunlight from entering the lens.

It should be noted an important point regarding motion sensors, which have been used for a long time and everywhere. These small appliances can be bought at any building supermarket, they are produced by many manufacturers and vary quite a lot in price. This is due to the use of lenses of different quality and the presence of a software component in the device itself. Often they have low cost and minimal functionality. To call such sensors, or a house equipped with them, "smart" would be an exaggeration. They can only turn on / off the lighting when motion is detected or the natural light changes. As a good automatic "switch" they work well. But to solve the problems assigned to "", devices of a completely different class are needed. Truly “smart” motion sensors have a lot of settings that allow you to create a truly intelligent home that takes into account an endless variety of situations and corresponding automation reactions. For example, many models for the KNX protocol are a kind of multi-sensors, they can not only detect movement and measure the flow of natural light, but also:

• fix the temperature;
• vibrations;
• the time spent by a person in the room;
• recognize the behavior of people in the room;
• self-learn to change the response threshold when the illumination changes;
• flexibly change the detection zone if necessary;
• issue an acoustic warning 15 seconds before shutdown.

Together with other sensors and other equipment (for example, multimedia devices and climate technology) this achieves something that is impossible for simple sensors entry level. Examples of such devices are the 8 in 1 and 12 in 1 sensors from HDL. Moreover, despite the multitude of parameters, controlled by the system, the ceilings and walls of the "smart home" do not become like spaceship- everything looks elegant. One of the most elegant solutions is Basalte's Auro recessed ceiling motion sensor, which is barely visible in the interior. Slightly more visible, but also more sensitive models also look neat and technological.

Selection of sensor parameters should be carried out taking into account local conditions. So, depending on the installation height, the same sensor will have a different coverage area. For example, in the characteristics of the ceiling presence sensor on the SPHINX 104-360 AP, it is indicated that with an installation height of 2 meters, it will be able to detect a sitting person at a distance of 4, and a walking person at a distance of 9 meters. And when installed at a height of 4 meters, the same figures will be 5 and 12 meters, respectively. Therefore, it is important to correctly calculate the number of devices, sensitivity and coverage area, the need for additional options (it is economically feasible to use simple sensors where "smart" options are not required). These parameters depend on the features of the placement space: the shape, height of the ceilings, the presence of barriers in the form of furniture and partitions; possibilities for mounting the device (material of walls or ceilings, design requirements); usage situations; the presence of all kinds of interference and non-standard conditions.
Thus, a pledge successful use all possibilities of the equipment is right choice a company engaged in the installation of "smart home" and motion sensors.

Types of sensors

The main classification of motion sensors is as follows:

At the place of installation they are:

• ceiling (with a viewing angle up to 360 degrees);
• wall-mounted (viewing angle up to 180 degrees).

By operating voltage:

• 24 Volts (including from the HDL bus);
• 30 Volt (from KNX bus);
• 230 volts;

According to the method of fastening:

• invoices;
• mortise or hidden, interceiling, only the lens and the design ring are visible from the outside.

According to the geometry of the detection zone:

• c round;
• with semicircular;
• with a rectangular
• with a square detection zone;
• o with disabled sectors (configurable).

The geometry of the sensors is usually comparable to the shape of the coverage area. If it is square, the sensor itself has a square (rectangular) shape, due to which its optical part, gently protruding from the plane of the ceiling, “looks” on four sides in the form of a pyramid with four faces. Wall sensors usually have the same shape, except for the optical part, which is made in the form of a hemisphere.

For example, ECO-IR DUAL-C NT BK - 230 Volt ceiling presence detector has a square detection area. This means that there will be no “blind” zones in a room equal in area to the coverage area of ​​the device. One sensor can control two groups of lights. For each group, it has a separate light measurement zone. Thus, these groups will not necessarily turn on synchronously. It has the possibility of parallel connection with other sensors (up to 10 pcs.). In practice, this means that each of the sensors will, as before, switch two groups of lighting devices, but the coverage area for switching on these two groups will increase in proportion to the number installed sensors minus the area of ​​zones that will be covered by adjacent devices. Sensor adjustment can be performed by a potentiometer on the sensor itself or remotely through the remote control.

The wall-mounted presence detector ECO-IR 180-24V BK is also made in a square form factor, but its optics in the form of a hemisphere “looks” at 180 degrees of the covered area.
AT color scheme sensors are dominated by white and black. Supplied with additional accessories. These include boxes for mounting, as well as impact-resistant grilles that protect the optics from mechanical damage. The functioning of the devices is also provided by remote control panels, which allow changing the parameters of the sensors without dismantling them.

Motion sensors, unlike presence sensors, are often used outdoors, sometimes in conjunction with a spotlight. They are:

• street;
• street with spotlight;
• for premises.

By type of setting can be:

• without remote control ;
• controlled remotely.

By zone object detection:

• 110, 150, 180, 220, 300, 360 degrees;

The detection field of any sensors can be divided into several separately activated and adjustable zones. For example, if we talk about a standard universal KNX motion sensor, it has 360 degrees of coverage, which can be divided into 3 zones. Each of the zones is programmatically configured and analyzed separately. If necessary, a part of the zone available to the device can simply be made inactive for tracking.

For rooms, motion sensors, as well as presence sensors, are ceiling and wall.
They are controlled automatically in the presence of movement or depending on the level of natural light. An important point in achieving an acceptable level of safety is that they have a separate detection zone under the sensor, which protects against attempts to “creep” unnoticed under it.

Restrictions

For all their intelligence, "smart" motion sensors have some limitations. If you have a dog weighing more than 40 kilograms, everything, even the largest sensors, will work on it. The sensor will not be able to distinguish one person from another. Therefore, he will react equally to the movement of attendants and household members. Taking into account these features and competently planning the location of the sensor complex, you can achieve the best effect.

What can be achieved with "smart" motion sensors?

Practical applications that make it easier everyday life, is the main success criterion modern technologies. Dry technical description should always find its expression in a level of convenience and comfort comparable to the efforts of the developers spent on creating the device. As an example of the practicality of use, let's take the highly intelligent motion sensor FIBARO Motion Sensor. The main features provided by the device are as follows:

• a small device with a case diameter of 44 mm will easily fit into a room of any design;
• convenient wireless control without the need to be near the sensor;
• in addition to fixing movement, it measures light intensity, temperature ( fire alarm), vibrations (break sensor, seismic shocks);
• customizable LED-backlight of the sensor will always visually notify you of the actual temperature in the room;
• high adjustable sensitivity of the motion sensor to the slightest movements;
• control of the time spent by the object in the room;
• a pair of sensors installed on opposite sides of the doors will be able to count the guests in the room and, depending on their number, turn on additional ventilation or perform another action;
• detecting the beginning of your awakening, the sensor activates the desired scenario, opening windows, raising the blinds and brewing coffee in the kitchen.

A smart home can provide these and other opportunities thanks to well-installed and configured motion sensors. They, being the "sense organs" of automation and watching what is happening around, will help to create a truly intelligent home.

Control various systems in the "smart home" is made on the basis of information that is constantly taken from the sensors. Their presence allows not only to provide comfort, but also significantly save electricity, as well as worry about the safety of residents of the house.

There are several types of sensors that without fail must be installed in the "smart home":

• movement;
• heat and smoke;
• air composition.

The first class is used to create comfortable conditions, security, and energy savings. These sensors can be integrated into the lighting and security system.

Installed in the rooms allow you to automatically turn on the light if someone comes in. This allows you to free yourself from having to manually look for the switch on the wall. Turning off the light occurs after a predetermined time.

In addition to the fact that this type of lighting provides comfort, it also ensures economical use of electricity. This is possible due to the fact that with such a lighting control system, the light is on only where it is needed.

The joint work of motion sensors with the lighting system also makes it possible to achieve comfortable movement around the house at night, when the light is supplied with an intensity sufficient for orientation, but at the same time not disturbing relatives.

When such sensors are integrated into the security system, timely detection of intruders is ensured. personal plot or in the house. On the site, motion sensors most often work in tandem with volume sensors so as not to raise an alarm if a cat or dog just ran in.

When an intrusion is detected, sound and light alerts are activated, and alarms are sent to the security console and the owner's phone.

Heat and smoke sensors contribute not only to prompt notification of a fire, but also to its prevention. They integrate into existing system firefighting. For its greater efficiency, both sensors must be installed, since their single use does not provide proper efficiency.

Due to the fact that control is carried out immediately from two positions: heat and the presence of smoke, the resulting fire can be extinguished at the very beginning without the involvement of specialists.

At the first sign of a violation of the temperature or physical parameters of the air, all electrical appliances and gas supply are automatically turned off. In addition, there is a notification about the situation that has arisen, it is provided best circuit evacuation and a signal is sent to the control panel of the corresponding service.

The installation of the third type of sensors, namely the composition of the air, is very often ignored. This is a very big mistake, as only they can effectively detect the presence of gas leaks. The presence of leaks is fraught with an explosion and causing significant damage to the property and health of people living in the house.

The determination that a dangerous situation is possible is determined on the basis of continuous measurements of the composition of the air. If it deviates from the norm, the gas supply is cut off, and all electrical appliances and sockets are turned off, except for those that are needed for the operation of the security system.

This prevents sparks from occurring. The ventilation system is also switched on for enhanced mode. Residents of the house and the gas service are informed about the presence of a leak.

As can be seen, the presence of sensors plays a fundamental role in effective work"smart home". Without them, home systems would be just a collection of electrical equipment.

Similar materials

The Smart Home security system uses several sensors to control the entry of "intruders" into the home. First of all, this wireless motion sensor. It recognizes moving objects by infrared radiation. top-end configurations are capable of not only detecting the presence of an object, but also determining the distance to it, reading its dimensions and even its approximate weight. The signal from the sensor is sent to the Smart Home controller, and then, depending on the installed software and settings, the system notifies the security agency and the owner of unauthorized entry into the house, the location of the intruder and his movements. The main disadvantage of motion sensors is that they can be fooled. The sensor reacts to body temperature if a person wraps himself from head to toe in warm clothes, it will go unnoticed. For this reason, it is recommended to combine infrared sensors with inductive ones, as well as to use them in combination with video recording cameras.

Another sensor for monitoring unauthorized entry - window and door opening/closing sensor. It is installed on a jamb or frame, controls the entire perimeter of the object. The principle of its operation is the same: when triggered, the sensor sends a signal to the controller. For added security, windows can also be fitted with glass break sensor.

Security and safety sensors in KEY

Intelligent Lighting

The already familiar motion sensor can be used not only for security purposes, but also in the construction of an intelligent light control system. Such sensors are most effective in the corridors: the light turns on at the moment when a person passes by.

Ideally, if the motion sensor will be paired with light sensor, which can be built into the motion sensor itself: if natural light enough, the light does not come on. .

In rooms system intelligent lighting best to build on presence sensors(they are more sensitive than motion sensors), but even better is to use photoelectric sensors in doorways. They determine when a person entered the room and when he left.

Emergency protection

To control the occurrence of such emergencies as water leakage, fire, gas leakage, there are special sensors.

Flooding protection:

• water leakage sensor- works at hit of moisture on sensitive electrodes. Installed in risk areas (bathroom, toilet).
• water pressure sensor- gives a signal about a change in pressure in the pipeline. Depending on the indications, he decides on the need to shut off the water.
• humidity sensor- more commonly used in a climate control system, but will also be useful for leak control if the main sensor does not work.

Humidity sensors in KEY

Protection against fire and explosion of household gas

Appropriate sensors are used to control smoke and gas leakage:

• smoke detector- determines the level of smoke in the room and, if necessary, sends an alarm signal to the unit security and fire alarm. Some smoke detectors have built-in alarms, so they can also be used as a stand-alone device.
• gas leak sensor- determines the concentration of gas in the air and, in case of excess allowable rate, sends an alarm signal to the Smart Home controller.

Climate control system

The Smart Home climate control system can use two types of temperature sensors:

• outside temperature sensor- sends information about outdoor temperature to the Smart Home controller, which in turn can turn on the ventilation system or change the heating mode.
• sensor room temperature - works in a similar way, serves to maintain comfortable temperature conditions in the premises.

In addition, the climate control system uses humidity sensor. With its help, "Smart Home" regulates the operation of the air conditioner and humidifier. Indications window opening/closing sensors can also be useful in the air conditioning system. If you coordinate the operation of heating and ventilation systems, you can significantly save on electricity.

Hello, friends

In my next review about the Xiaomi smart home ecosystem, I will talk about the wireless motion sensor - Xiaomi Smart Human Body Sensor. This is one of the most common and necessary sensors for a smart home system; it can also participate in signaling and lighting scenarios, video surveillance. About everything in more detail - further.

Where can I buy?

The main characteristics are written on the back side, as usual - in Chinese, but from the text you can understand that the sensor works using the ZigBee protocol, that is, Xiaomi Mi Multi-functional Gateway is required to pair with the sensor, uses a CR2450 battery and operates at temperatures from -10 to +45 C

Inside the box, protected around the perimeter by thick cardboard sides, there is a wireless sensor. The first time - the impression, like from the humidity sensors and the smart cube - "how small it is." I expected it to be small, but still smaller than I thought.

In the kit, from the useful - only the sensor and one round piece of double-sided tape. Spare as in the same temperature and humidity sensors - no.

The sensor has the shape of a small barrel, on one side of which is the Xiaomi smart home logo.

The other side is a battery cover that opens with rotation, on which some data is applied, apparently the year of manufacture, and the type of battery. Also on the lid there is something like a round rubberized leg.

Under the cover is a Panasonic CR2450 cell. Replacing the battery is easy and fast, you don’t even have to peel off the sensor - just turn it, the cover will remain in place and the sensor - in your hand - all you have to do is change the battery.

Although the dimensions are indicated on the box, but out of habit I will take measurements - diameter 30 mm

The height of the "barrel" of the sensor is 34 mm, so geometrically it is almost an equilateral cylinder

Sensor weight - only 18 grams

To pair with the gateway, you will need a paper clip (not included) - such as goes to smartphones, for a SIM tray. I used a paperclip from a Little Square camera, but just a straightened paper clip will do. There is a hole on the side of the sensor, behind which there is a pairing button.

To connect, you need to launch the Xiaomi Mi Multi-functional Gateway management plugin, then go to the devices tab and start the wizard for connecting a new sensor. Next, choose a motion sensor. After that, you need to, using a paper clip, press the pairing button and hold until the sensor blinks blue three times. After that, it remains only to choose the room in which the sensor will be located and one of the three options for icons.

After that, a new sensor appears in the list of devices. A separate plugin is also not installed, as in the case of the cube. When you click on the sensor - go to the control screen. It has two tabs - Log, which records all cases of sensor triggering and a script window. There are several recommended scenarios in the scenario window - all of them offer to turn on and off lamps, sockets, electrical devices by motion detection.

In scenarios, the sensor can only act as a condition, which is generally logical. There are 6 options to choose from - motion detection and vice versa - no movement for 2, 5, 10, 20 and 30 minutes.

Examples practical application such as night lighting. As a script instruction, which is launched upon motion detection by the sensor, it is launched Light up for adjustable period of time - brightness 1% of full with automatic shutdown after a minute.
The time of the scenario, for example, from 22:00 to 08:00 - in the finished scenario is displayed in the Chinese time zone (if selected, the local time is indicated)

The next example is lighting control in a dark hallway. We come in from the street, in the hands of the bag, and there is no need to grope for the switch - the light turns on by itself. While the sensor registers movements, the light will be active, and after you leave the hallway, the light will turn off by itself, you won’t have to return.
Another option is a scenario in which, when a motion sensor is triggered, the recording of an alarm video will be activated along with a notification to the control device.

Since we are talking about security, then of course you need to set the alarm mode to Xiaomi gateway. To do this, in the scenarios tab there is a special section - Arm, which is responsible for setting up the alarm. Let's go through all the settings - Arm Timer - the days and hours of the alarm, when the parameter is enabled - the alarm is set automatically. Not required condition- can be activated and disarmed manually. The condition for triggering the alarm - put a tick in front of the motion sensor. If there are several sensors, you can select all.

Next, select the alarm activation interval. This is the time between when the alarm was activated - and arming. By clicking on the Alarm on button - you have 15 seconds (in the screenshot - an example) to leave the motion sensor coverage area. And it remains to choose only the type of sound signal, its volume, duration, sending a notification to the control device. Yelling must be said very loudly, uninvited guests- I think they will not be operating around the apartment when this alarm goes off. It will be fair to note here that due to the jittering of Chinese clouds, sometimes (not always) there is a slight delay - up to a minute, no more, between setting the alarm and responding to the sensor. But after a minute has passed since the activation of the security mode, it works 100%.
I will also give an example of a security scenario in which a motion detection light turns on and illuminates the alien, the camera shoots an alarm video, the gateway creates a pleasant musical background with a police siren, and you receive a notification about the motion sensor triggering.

Sensor, due small size and weight - easy to place in the right place, complete adhesive tape easily holds it on the surface in any orientation - above or below it. The place must be chosen not conspicuous and so as not to accidentally hurt or knock down the sensor. You should also consider using the sensor in different scenarios at the same time.

For example, in this order, I took two sensors at once and chose the locations in such a way that the entrance to the apartment and the corridor connecting the rooms are controlled. Thus, the sensors work in two directions - lighting control and security. Scenario - "Leaving home" - switches the gateway into armed mode, deactivates all unnecessary scenarios for lighting control, etc. The second scenario - "Returning home" - disables the alarm and activates scenarios in which one of the sensors turns on the light in the hallway and turns it off after two minutes of no movement, the second one turns on a light backlight at night if it detects movement along the corridor.
The number of scenarios in which each sensor can operate both simultaneously and separately is essentially unlimited.

The sensor - I consider one of the most necessary for a smart home system - because it will allow the system to recognize the presence of a person, and, depending on this, run the necessary scripts.

Video version of my review:

All my reviews of Xiaomi devices in chronological order- List

Thank you for your attention - see you soon.