If you have decided to implement a “smart home” system, then you have probably asked yourself the question of automating microclimate control. Automatic switching on air conditioning when it gets hot, or turn it on when the air is too dry - sounds good, right? But the automation system needs to collect indicators of the current air condition. For this there is a special temperature and humidity sensor Xiaomi temperature sensor.
Of course, ordinary mercury thermometers will not soon fall into oblivion, and modern electronic sensors are not so widespread, but, without a doubt, the future belongs to modern gadgets. What can a regular thermometer do? Show temperature. What else could you want from a thermometer, it does its job, and that’s okay.
What can a temperature sensor from Xiaomi do?
Firstly, it is a temperature and humidity sensor. Accordingly, it can show twice as much information as a conventional thermometer. But, of course, this is not its main advantage. First of all, the sensor can be connected to the "" system, monitor the readings remotely and use these readings in.
And knowing the temperature is sometimes very important. For example, at home, when a child is sleeping in the room, the temperature should be constant. Or in the server room, when the operation of the air conditioner is vital for the servers.
Appearance of the Xiaomi temperature and humidity sensor
A round tablet of matte white plastic, 3.5 centimeters in diameter and a centimeter in height, with a thermometer icon in the center. There is a hole for air intake at the bottom, and a pairing button at the top. There is a blue LED indicator to help you when pairing the device.
The sensor is powered by a CR2032 battery. To replace the battery, you must rotate the back cover 10 degrees counterclockwise.
Full device specifications:
Characteristics of Xiaomi temperature sensor
Despite the fact that the temperature range is clearly designed for outdoor use, the instructions indicate that the sensor can only be used indoors. This is due to the lack of protection from moisture, i.e. Even light rain can render the sensor unusable.
Since the temperature sensor uses a protocol, it requires one of the . Without it, it won't be able to show you the temperature.
Connecting a temperature sensor in the MiHome application
We connect the device according to the standard scenario: go to and click on adding a new device manually. Following the instructions, press the temperature sensor button for 5 seconds and then release. The indicator should blink blue 3 times, and a female voice from the gateway should notify you of a successful connection.
Standard, for connecting sensors, name and location settings:
Once connected, place the sensor in the desired location. You can either stick it to the wall or just put it anywhere. It is only necessary to take into account that the place is dry and inaccessible to moisture. Of course, we will want to place the sensor outdoors and if you have a private house, then we attach it to the porch under the roof and don’t worry. And so who is good at something, someone cuts out the bottom plastic bottle and a sensor covers it, someone cut a tennis ball and put the sensor inside. Here you need to approach each case individually.
Now let's go to the sensor plugin, you can find it by going to the gateway, devices and there we find the temperature sensor. Depending on the state of the environment, the background in the temperature sensor plugin changes color:
In the plugin settings, you can configure the sending of an alert when the indicators go beyond the comfortable limits; to do this, you need to activate the appropriate setting:
The dynamics of changes in temperature and humidity can be seen on the graph. You can build a chart for a day, week or month:
Scenarios for Xiaomi temperature and humidity sensor
Depending on the sensor indicators, scenarios can be launched. A total of 4 actions are available:
1. If the temperature is higher than the set value;
2. If the temperature is below the set value;
3. If the humidity is higher than the set value;
4. If the humidity is below the set value.
The threshold value is set by you when setting up the script:
Almost any action can be attached to a script, from simply sending an alert to turning on the stove or air conditioner. In combination with additional sensors, scenarios can become more complicated. For example, turn on a humidifier at low humidity only if the window is closed.
With any automation, you can’t call a smart home if it doesn’t even know the temperature and humidity of the interior, so if you don’t already have a temperature and humidity sensor, then you should think about purchasing one.
Buy Xiaomi temperature sensor
Like all devices smart home Xiaomi, the easiest way to order a temperature sensor with delivery is from the FoxPox.ru store for 850 rubles (for Moscow). Or order with or.
Automation sensors are a structurally autonomous independent device that changes its signal according to the monitored parameter. Sensors are placed directly at the point where information is collected and perform the function of a primary converter of a certain (measured) quantity into an electromagnetic or electrical one. Then the received values are transmitted further, signaling the equipment to perform an action.
The most convenient means for converting and transmitting a signal is electric current. In this regard, sensors for the Smart Home are created and operate based primarily on the principle of changing their own electrical resistance under the influence of external factors.
Today you can buy automation sensors that monitor the values of various parameters. These are sensors for humidity and vibration, motion, light, smoke and solar radiation, gas pollution, temperature, etc. Exists a large number of manufacturers providing products with different sets of functions and in different price groups.
Advantages of creating an automated Smart Home system
The Smart Home automation system is an innovative approach to the arrangement of residential and commercial premises. Using a combination of sensors and equipment, it is possible to create functional and comfortable spaces for Everyday life and work.
Consumer benefits when installing sensors for a smart home:
- comfort - with the help of equipment, automated control of climate, room lighting, etc. is carried out;
- safety - installing sensors for smoke, gas leaks, window breaking, flooding and other parameters allows you to timely prevent possible danger, since the equipment will turn on a sound (siren) and/or light signal when a threat appears;
- saving time - automation sensors are able to transmit commands to the equipment not only about turning on/off the lights, but also about opening blinds, watering a garden plot, ventilating rooms and other actions;
- energy saving - automated system Smart Home is capable of adjusting the brightness of lighting, promptly turning on and off street lights, the heating system when a certain temperature is reached in the premises, etc.
With the installation of automation sensors, many everyday tasks, albeit simple, but distracting with their bustle, fade into the background, freeing up a significant amount of time. These systems allow you to avoid many risks, such as flooding, smoke, etc. It is possible to program the equipment in such a way that it creates the complete illusion that the owners are at home while they are away, which significantly reduces the risk of interference from outside.
The price of automation sensors for a smart home has a wide range depending on the manufacturer, functionality, and class of devices. Due to the significant advantages of the systems, they pay for themselves quite quickly. Our online store provides you with a wide selection of equipment; The sale of sensors for a smart home is carried out with the possibility of pickup, as well as delivery in Moscow.
Today there are many elements of an electrical control system - various temperature, motion and sound sensors. In conjunction with the internal electrical wiring of a house or apartment, they are able to automate the processes of turning on/off lights, heating, and control the operation of some household appliances, taking into account time modes. But it won't be centralized system control, that is, you will not be able to control the light and other consumers from a single device.
That’s what’s good about a smart home system, because with it you can control all consumers connected to the wiring using one device - mobile (tablet, smartphone, remote control) and/or stationary (computer/laptop, graphical interface of the system). In this case, all sensors and relays are also present in the system and control the power supply automatically.
In addition to basic household consumers, an intelligent (smart) home can monitor and manage communication systems, fire extinguishing systems, security alarms, telephone lines and many others, including utilities.
However, for complete control of household appliances, for example, regulation of the modes of an air conditioner or refrigerator, the devices themselves must have a special connector, through which a connection is made to the electronic logical controller of the control system. Next, we will consider the basics that will give you an understanding of the smart home system, its operating principle and its components.
Components of a smart home system
First of all, it is worth noting that today there are many modifications and configurations in which the smart home control system can be implemented. Many manufacturers provide system kits with built-in Wi-Fi and/or Bluetooth transmitters (communication modules) built into the controller, which can be used to control the system wirelessly via a mobile device within an apartment/house.
Types of smart home system architecture
There are modifications in which control occurs via the Ethernet interface (wired, via); You additionally need to connect switches and Wi-Fi routers to them for wireless control, if they are not built into the controller. As for manual switches, they can also be connected to the central controller wirelessly or through electrical wiring. In general, there is a variety of equipment for a smart home system, and the system consists of the following elements:
- smart home controller (main and discrete input/output modulators);
- expansion and communication modules (switches, routers, GPS/GPRS modules);
- electrical circuit switching elements (relays, dimmers, power supplies);
- measuring instruments, gauges and sensors (motion, temperature, light, etc.);
- system controls (remotes, touch panels, PDAs, tablets);
- actuators(water, ventilation, gas valves, roller blinds, etc.).
When choosing equipment, it is also important to consider which protocol (method) of data transmission of the Smart Home system is used. For example, the widespread EIB\KNX protocol uses computer networks, radio channels, power Electricity of the net. There is also the X10 protocol, which uses household network AC 230 V: devices exchange a signal given at the moment the AC current passes through zero. Such signals are radio frequency pulses at 120 kHz, with a duration of 1 ms.
What is a controller for a smart home system?
A smart home controller is a device that controls all consumers and devices, and also sends a report to the owner about the status of these consumers. It is guided by temperature, air, and light sensors to control lighting, heating, and air conditioning systems. Can be programmed to perform various actions over time, according to a time schedule. In addition to the standalone mode, you can contact the controller through a special interface (computer network, mobile operator or radio network), and manually control the devices.
Devices controlled by a smart home system controller
It is necessary to select a controller depending on how you want to build the architecture of the control system. For example, there are two types of management systems: centralized and decentralized. The centralized control system is based on a single high-performance central controller that manages all consumers (devices) and engineering networks in the house.
In the case of decentralized control, an intelligent smart home system consists of several simpler controllers, each of which has the functions of controlling a specific zone - a room and all the devices in it, separate lighting groups throughout the house, specific purpose household appliances, etc. ( regional controllers).
Central controller for a modern smart home system, it is a computer enclosed in a small plastic case that has its own OS (operating system), RAM and many electronic components for switching (controlling) signals: electronic relays, terristor switches, etc.
One of the complete sets of the central home controller of the smart home system (wireless transmission module, USB, COM, Ethernet ports on board)
Also, depending on the configuration, there may be a built-in GSM module for remote control via mobile phone, Wi-Fi transmitter for controlling the system from anywhere in the house and a graphical touch or push-button interface (LCD screen). In addition, connectors for connecting to a computer and/or network equipment: Ethernet, USB.
Such a controller is capable of controlling intelligent equipment such as refrigerators, microwave ovens, utilities, etc. (if the equipment itself has such a function), reporting to the owner even data such as the temperature in the refrigerator, incoming and outgoing phone line calls, and much more.
Regional controller , a discrete input-output modulator is a low-power logical electronic control unit on which smart home technology is implemented (in comparison, the frequency of the microprocessor CC is about 500 MHz, the RC microprocessor is about 50 MHz), usually does not have an operating system and is system-configurable. It can be configured for any elementary scenarios based on time or signals from certain sensors.
Programmable smart home system controller with Ethernet interface (connector for connecting to a network)
He manages elementary tasks and events. For example, a light sensor connected to it gives a signal (when it gets dark); the controller sends a signal to the executive relay or group to control the lighting. It also notifies the owner of every action. In other words, a discrete I/O modulator is a kind of intelligent programmable electronic relay.
Such a device also consists of electronic components for network switching and an intellectual part: a microprocessor with memory. It (depending on the manufacturer and configuration) may have a USB, Ethernet interface and other ports for control, programming and reporting to the owner.
What are expansion and communication modules for a smart home system?
Expansion modules are devices that are connected to the controller and expand its functionality. In part, adapters, double-triples and measuring instruments are also expansion modules. Such devices can be built into the controller, connected separately through a specially designed connector or a common connector for Ethernet, USB and other interfaces. Due to the fact that companies producing smart home systems use various data transmission encryption systems, when choosing an expansion module, it is important to pay attention to its compatibility if the controller is purchased from another manufacturer.
On the right are smart home system controllers with built-in wireless data transmission modules
Communication expansion modules For a smart home system, they are data transmission devices wirelessly or wired. The first include the well-known Wi-Fi routers, which connect to the controller in the same way as to a computer, via Ethernet or USB (there are also specially “sharpened” branded modules with their own connection system). Less commonly used are separately connected GSM/GPRS modules (since they are usually built-in), with the help of which the smart home system can communicate with the owner via SMS alerts to his phone number. There are wireless communication modules Bluetooth (radio signal) and IR (transmission via infrared beam).
GSM and Wi-Fi wireless communication modules; wired Ethernet switch
For a wired method of expanding communication, switches are used - devices that connect several clients (computers, controllers and other intelligent devices) to one local network. They are necessary for the device decentralized system smart home, when there are several regional controllers, as well as to create a common network with computers and other smart devices using appropriate interfaces. When the signal transmission distance is long, special digital amplifiers – repeaters – are used to amplify it.
Functionality extension modules Smart home systems have a wide variety of functionality, and, as a rule, are connected to a common or special interface connector. They expand the list of controller functions, for example, the voice message module makes it possible to control the system using sound (voice) commands. It is also possible to make the smart home control system play audio messages (greetings, warnings, congratulations, etc.) on the speakers.
Expansion modules for controlling complex mechanisms, stepper motors, etc.
It is also worth noting the expansion of functionality through adapter modules, which can be used to achieve compatibility between different device standards. Special control modules are designed to control various specific devices (engines, door opening/closing mechanisms, ventilation valves; much more) and electrical circuit switching elements. Thus, a smart home controller does not have power over power circuit breakers (plugs, circuit breakers), and when connecting a circuit breaker control module and using controlled circuit breakers, the function of turning them on/off using the controller becomes available. To connect lighting controllers (dimmers - see below) to the smart home system, special expansion modules are also required.
What are switching elements of a smart home system circuit?
The concept of switching an electrical circuit means closing/opening it, as well as regulating voltage and other parameters electric current. Voltage (lighting) regulators, converters/transformers, power supplies, circuit breakers and relays are all switching elements, without which the installation of a smart home system (like any electrical wiring system) cannot be completed. They may have built-in network overload protection and short circuit and are triggered, opening the circuit, thus performing a protective function.
A simple diagram of a smart home system with a controller, switching (control) elements of an electrical circuit and elementary consumers (in in this case- lighting lamps)
Circuit breakers designed to protect electrical wiring from overload or short circuit. They are selected according to the power for which the electrical wiring line they control is designed. For a smart home system, there are both ordinary manual and controlled automatic switches.
The image shows simple single-pole circuit breakers
The former have in their design a mechanism that, when heated due to overload, opens the circuit, and can also be turned off manually. Controlled machines have a special interface output to the control module, through which the main controller and the owner can control them remotely, without looking into the control room at all.
Relays and relay blocks - these are elements for controlling power circuits using a signal supplied from the controller. The signal may appear in the form of a low power current, usually 24 V (again, there is no single standard, there are different systems and manufacturers) or another signal.
The image shows electromagnetic relays for monitoring one or several lines of a power circuit
Unlike circuit breakers, relays do not have protection and the circuit closing/opening mechanism looks the opposite: when control voltage is applied to the electromagnetic part, the latter actuates the armature and mechanically closes the contacts of the power supply circuit (220 V). The most basic relay for controlling one phase power line has three inputs and one output: zero and the electromagnet control phase (24 V), the power phase input (220 V) from the protective circuit breaker and its release to the consumer.
Voltage regulators (lighting) are mainly used to control the supplied power and voltage for lighting fixtures. The basis of such regulators is a circuit element - a rheostat, a device for regulating lighting. For an ordinary power circuit, it is a mechanism with a slider, enclosed in a box with the dimensions of a switch and also has an on/off function.
Dimmer controlled manually (right) and remotely (left)
The new type of smart home control system for lighting groups contains a device called a dimmer (it is also connected to the controller through a special control module). This device is designed to control one or more lighting power groups and is controlled using a controller in automatic mode or remotely by the owner, which is convenient. Another advantage of the dimmer is that through it the controller can control the brightness of the lighting, guided by data on the light level obtained from the light sensors.
Power supplies, transformers, converters - these are devices of complex architecture that are designed to change the parameters of the electric current, if necessary, in one or another section of the circuit or throughout the entire circuit.
Power supply from 220 V to 12 V
They are used due to the fact that some consumers are designed for current characteristics other than the alternating 220 V/50 Hz supplied in everyday life in the CIS and Europe. For example, take the same lighting: there are special fluorescent, neon and other highly decorative lighting that operate on 10/12/24 V direct current. In order to achieve such characteristics, a power supply of 220-10V, 220-12V, 220-24V is mounted on the corresponding section of the circuit. Such devices can operate in one mode, for example 220-24V, or in all three of the above.
What are measuring instruments, gauges and sensors in a smart home system?
These devices are like the organs of smell and touch for a person: they give an idea of what is happening in environment. Thanks to modern measuring instruments, sensors (of which the variety is very large today), the controller of the smart home system receives data on temperature, humidity, degree of illumination and atmospheric pressure outside and inside the premises.
The figure shows sensors with elementary functions
There are instrumentation for monitoring the condition of utilities: pressure and metering of water flow and gas leakage with an electronic interface that allows you to transfer this data to an intelligent smart home system, which will generate reports and send them to the owner.
Analog sensors and gauges The traditional type uses low-voltage current up to 24 V as data transmission, as a rule, and small cross-section electrical wiring as the transmission medium. For example, the most basic light sensor contains a photocell with an input and an output through which a phase of low-voltage current passes. This photocell changes its resistance when light hits it, thus producing various parameters current in different time days.
The figure shows elementary analog sensors that respond to household and carbon dioxide
The controller receives these values, processes them and, accordingly, sends a signal to turn on/off groups of lighting fixtures, as well as regulate the lighting level (if there is a dimmer). A roughly similar system, only with different operating elements, is available in temperature control sensors (based on their data, the intelligent smart home system controls heating), movement and noise (light, alarm), gas and water leaks (control of valves that shut off gas and water) and much more.
Digital sensors and gauges new generation devices have expanded functionality and are smart devices. For example, modern multifunctional motion sensors are capable of not only outputting data to the controller in two parameters: 1 (“yes”, there is movement) or 0 (“no”, there is no movement).
The picture shows a digital air humidity control sensor
They are capable of measuring the distance from the sensor to a moving target, detecting delays in the movement of an object, and much more. All this is processed by a microprocessor built into the sensor and supplied to the controller in the form of digital signals. It is worth distinguishing sensors from control and measuring devices: sensors and sensors detect events, and control and measuring devices detect the physical quantities of the body or object being measured (speed, weight, volume, etc.).
Instrumentation – these are more complex devices, in contrast to simple analog sensors, that incorporate new smart home technologies and control a wide range of parameters, providing their physical units of measurement. Digital barometers, water and gas meters, the same voltage - all these are control and measuring instruments.
Hot water temperature and flow control device
Unlike analog instruments and sensors, modern digital ones have own system calculations based on a simple microprocessor; they process the signals and supply ready-made data to the smart home controller, thereby partially relieving its processor. Digital instrumentation and sensors use a special interface as a data transmission medium.
What are the elements and methods of managing a smart home system?
The intelligent (smart) home system can be controlled in three ways: local wireless, remote wireless, local wired, remote wired. Control devices are included with the system - these are graphic control panels with touch or push-button input, remote controls with receivers tuned to a specific frequency. Devices not included in the package, such as mobile compact computers (smartphones, tablets), are configured using special software for remote control via worldwide information networks.
The smart home system can be controlled by remote control, control panel and mobile devices
Wireless local control method with a limited radius is carried out using control devices via a local (local) radio signal, Wi-Fi or Bluetooth wireless radio networks. In principle, in this way you can control the system from anywhere in the house and even while on personal plot nearby. However, in big houses You may need additional radio points and wireless signal amplifiers. Control is carried out by remote controls, touch panels, mobile devices (smartphones, tablets, laptops) that have a built-in or externally connected transmitter of one or another Wi-Fi network, Bluetooth or proprietary radio frequency signal.
On the tablet screen - software for monitoring indicators and devices connected to the smart home system
Wireless remote control method available if the smart home system is installed to global networks or communication expansion modules that provide access to them. These networks include GSM/GPRS (control by means of mobile communications), mobile Internet, and a special dedicated radio signal. The presence of an output to the GSM/GPRS network allows the system to send SMS, MMS and audio messages to the phone number of the home owner. It is also theoretically possible to control via voice menu. Tools for managing smart home systems via global networks are, as a rule, smartphones, as well as tablets and laptops with built-in transmitter modules for the mobile Internet.
Wired local control method , depending on the data transfer protocols used, the smart home system may have data transfer media via twisted pair (computer network cable), electrical wiring (X10 system protocol) or some other cable. In each regional and central controller, the smart home control system provides an output for wired communication with control devices, as well as the exchange of information with other smart devices that are “subordinate” to it. If there are several devices, then the interface is expanded using a switch (see “communication expansion modules” above), creating several branches. For the wired local control method, included and separate control panels and switches (push-button and touch) are used, and you can also control via a computer or laptop connected to the cable.
Touch control panel for the smart home system combined with an intercom
Wired remote control method smart home systems are a network larger than the local one, that is, the house is controlled from the outside via a laid cable connected to the internal control network. As a rule, this control method is used in the management of automated processes in building buildings. In general, for home use you don’t need to know this (controlling systems through regional wired networks).
What are actuators of a smart home system?
Unlike relays, which can partly be called actuators (giving a command - the relay closes/opens the circuit), actuators controlled by intelligent equipment for a smart home system are complex electromechanical products, devices designed to test high mechanical loads.
In the image you can see objects that may have built-in actuators of the smart home system
The working body of more complex devices (drives for opening/closing gates, blinds, etc.) is a motor, while for less complex devices (valves, locks) it is a core driven by an electromagnet. Most are controlled from low voltage current up to 24 V inclusive, but there are also high-power drives designed for 220 V.
Electromechanical opening/closing drives gates, gates, doors, windows, blinds and curtains; electromechanical parts built into the furniture, making it motorized. Included they may have a connection interface and a remote control.
A girl controls the window mechanism of a smart home system using a wireless remote control
Advanced drive models have elementary systems automated control: built-in sensors and the ability to adjust speeds and extreme opening/closing positions. Today, most often there are autonomous drives for curtains and blinds that are not controlled by an intelligent smart home system: controlled from a remote control of an infrared transmitter, and not having any connection with the smart home controller. However, such devices are also considered separate elements of a smart home.
Valves low, medium and high pressure - these are simpler mechanisms for control water supply networks(including fire extinguishing), gas pipes and ventilation. Valves are used in control systems: gas - in gas control systems, water - control of water supply, flood prevention and fire extinguishing.
The image shows a water valve controlled by a smart home system
Very healthy and worth noting the system ventilation valves, which is triggered by sensors carbon dioxide(CO2). The system removes gases harmful to humans and creates a favorable microclimate. Such elementary mechanisms include electromagnetic locks and other elements of access control to the premises included in the smart home security system. Such devices generally do not have microprocessors and have only two positions: open and closed.
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 alarm, lighting, and video surveillance scenarios. More details about everything below.
Where can I buy?
InspectionThe sensor is delivered in a white box familiar to Xiaomi smart home sensors; all printing is done in grayscale, looks neat and is already recognizable.
On the back side the main characteristics are written, as usual - in Chinese, but from the text you can understand that the sensor works using the ZigBee protocol, that is, to pair with the sensor you need the Xiaomi Mi Multi-functional Gateway, 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 same impression from the humidity sensors and smart cube - “how small it is.” I expected it to be small, but still smaller than I thought.
The only useful things included in the kit are a sensor and one round piece of double-sided tape. There is no spare one like the same temperature and humidity sensors.
The sensor has the shape of a small barrel, on one side of which there is the Xiaomi smart home logo
The other side is a rotating battery cover, on which some data is printed, apparently the year of manufacture, and the type of battery. There is also something like a round rubberized foot on the lid.
Under the cover is a CR2450 cell made by Panasonic. Replacing the battery is easy and quick, you don’t even have to peel off the sensor - just turn it, the cover will remain in place and the sensor will remain in your hand - all you have to do is change the battery.
Although the dimensions are indicated on the box, out of habit I’ll take measurements - diameter 30 mm
The height of the sensor “barrel” 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 paperclip (not included) - the same one that comes with smartphones for the SIM tray. I used a paperclip from a Little Square camera, but just a straightened paperclip will work. 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 control plugin, then go to the devices tab and run the wizard for connecting a new sensor. Next, select the motion sensor. After this, you need to use a paper clip to press the pairing button and hold until the sensor blinks blue three times. After this, all that remains is to select the room in which the sensor will be located and one of three icon options.
After this, a new sensor appears in the list of devices. A separate plugin is also not installed, as in the case of a cube. When you click on the sensor, you go to the control screen. It has two tabs - Log, which records all cases of sensor activation, and a scenario window. There are several recommended scenarios in the scenario window - all of them suggest turning on and off lights, sockets, and electrical devices by detecting motion.
In scenarios, the sensor can only act as a condition, which is generally logical. There are 6 options to choose from - motion detection and, on the contrary, no movement for 2, 5, 10, 20 and 30 minutes.
Examples practical application- for example, night lighting. As a script instruction, which is triggered when motion is detected by the sensor, it is launched Light up for adjustable period of time - brightness 1% of full with automatic shutdown after a minute.
The duration of the scenario, for example from 22:00 to 08:00 - in finished script displayed in Chinese time zone (if selected, local time is indicated)
The next example is lighting control in a dark hallway. We walk in from the street, with a bag in our hands, and there is no need to fumble for the switch - the light turns on itself. As long as the sensor registers movements, the light will be active, and after you leave the hallway, the light will go out on its own, so you won’t have to come back.
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 we need to configure the alarm mode on the Xiaomi gateway. For 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 - days and times of alarm operation, when the parameter is turned on - the alarm is set automatically. Not required condition- can be activated and disarmed manually. The condition for triggering the alarm is to check the box next to the motion sensor. If there are several sensors, you can select all.
Next, select the alarm activation interval. This is the time between the alarm being activated and arming. By clicking on the Alarm on button, you have 15 seconds (example in the screenshot) to leave the range of the motion sensor. All that remains is to select the type of sound signal, its volume, duration, and sending a notification to the control device. It must be yelled quite loudly, uninvited guests- I think they won’t be operating around the apartment when this alarm goes off. Here it would be fair to note that due to the shaking 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 from the moment the security mode is activated, it works 100%.
I’ll also give an example of a security scenario, in which, upon detection of motion, a light turns on and illuminates the alien, the camera films an alarming video, the gateway creates a pleasant musical background with a police siren, and you receive a notification that the motion sensor has been triggered.
Sensor, due to small size and weight - easy to position in in the right place, the included adhesive tape easily holds it on the surface in any orientation - above or below it. You need to choose a place that is not conspicuous and so as not to accidentally touch 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” - turns the gateway into security mode, deactivates all unnecessary scenarios for lighting control, etc. The second scenario - “Returning home” - turns off the alarm and activates a scenario 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 - at night turns on a light backlight 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, launch the necessary scenarios.
Video version of my review:
All my reviews Xiaomi devices in chronological order - List
Thank you for your attention - see you again.
Thanks to various sensors operation of smart home systems will become more convenient.
However, in order for devices to function effectively, it is necessary to carefully select them and configure operating parameters
When selecting, installing and configuring motion (presence) sensors, potential users face a number of difficulties.
Thus, buyers not only confuse terms or types of sensors, but sometimes have a poor understanding of what functions certain devices perform.
Motion sensor or presence sensor
Motion Sensor monitors movements in the controlled part of the house (sensitivity zone), with infrared radiation detectors most often used. At the same time, the built-in photosensitive element registers the lighting level, and if the latter is insufficient, the device turns on the light.
Presence sensor is equipped with a more advanced optical system and is able to detect even slight movement (for example, turning pages).
This more accurate and expensive device is equipped with a light level recorder.
In addition, there are hundreds of types of sensors (for example, one of the longest product lines of B.E.G. has more than two hundred models).
As practice shows, installing the “best” (that is, the most expensive in the series) device does not solve the problem.
What to do?
Sensor selection options
The last parameter is the load power, determined by the number of connected lamps or other devices.
Sensor type. Models are available for dry, wet and cold rooms (for example, a garage), as well as for outdoor installation.
A separate type is narrowly targeted devices for corridors, galleries and other elongated rooms. Some occupancy sensors are equipped with several output circuits: lighting is connected to one, and, for example, an exhaust fan is connected to another.
Finally, there are occupancy sensors for bathrooms.
They are equipped with a sound sensor: by the sound of water, the device understands that the owners are in the bathroom. At the same time, the light will not go out, even if the storms have moved away and there is no movement. There are also sensors.
Sensor mounting options.
In addition to the standard ones, for electrical installation products of surface-mounted and mortise models, sensors for installation in dropped ceilings(B.E.G. has such models, for example).
This installation option allows for flush mounting of devices. Externally, such a sensor is difficult to distinguish from a halogen lamp. Installation. Can be ceiling or wall mounted. The latter method is often used in rooms with too high ceilings ( optimal height placement of most ceiling models - 2-3 m).
Before installation, the sensor must be configured. The product body has one or more regulators.
With their help, the illumination level (threshold value at which the device is triggered), sensitivity level, response delay time and special operating modes are set, for example, when the light is only turned off by the sensor, but lights up when the key switch is pressed.
In the same way, you need to adjust the viewing angle of the device. For this purpose, the kit includes overhead plastic curtains - the so-called signal cut-off filter. The required viewing angle of the sensors is set by removing part of the curtain; unnecessary plastic is manually broken off along the notches.
It should be taken into account as much as possible permissible load, that is, the number of devices turned on at the command of the sensor.
Modern LED and fluorescent lamps(unlike incandescent lamps) have an unpleasant feature - they create a very large starting load on the connecting device, which is why the presence sensor may simply burn out.
Optimal load on connecting electrical installation products (sensors and dimmers) for LED lamps should be 2-3 times less design power loads. In practice, this means that if the sensor is designed for 300 V, then the total power of the LED lamps connected to it does not exceed 150 V.
On a note:
Motion and presence sensors must be installed so that they are not triggered by cars driving along the street or other false signals.
Note: unusually smart doors
The simplest electronic access control system consists of two devices - a locking device (electromagnetic or electromechanical lock) and reader. The reader receives data from the plastic card and opens the lock.
Such doors are widely installed in offices, industrial buildings, hotel complexes and residential buildings. The software can decide the time of access to the premises and the number of visits.
But the card code, although it is individual, can be read, forged, and the card can be stolen. Then door manufacturers went further, and biometric detectors were born that recognize a fingerprint, scan the retina, and identify a voice. Smart doors can be integrated with security and video surveillance systems.
This provides additional features- for example, sending photographs of people approaching the door to your email with a specific date and time of the visit. The day is not far when a door will automatically recognize its owner from afar and swing open welcomingly in front of him.
Important: the lock is of great importance. If it is unreliable, then, even with a hundred levels of protection, the design will not be able to provide the necessary security.
The “smart” door is equipped with a cylindrical locking system, protected from opening by any methods - unlocking, picking keys, drilling, blasting. In case of illegal attempts to enter the protected area, the system will notify the intruder that the object is under protection. Often such a warning is enough to scare away the criminal. Additionally, the owner will be notified via SMS about all attempts to penetrate. If the criminal tries to turn off the radio signal, this will also become known thanks to the monitoring station, which constantly monitors the environment.
Note: Smart windows and how they work
Modern windows can open according to a given program, close in the rain, and regulate their light transmission, noise level and indoor temperature.
Currently, handles that maintain a set temperature in the room by sending a signal to the air conditioning system when the window is opened are gaining popularity among smart devices for windows - as a result, the air conditioner is temporarily turned off. Such window handles can be controlled remotely through a special application on a computer or mobile device. Smart handles can be installed on both new and existing windows.
Systems automatic ventilation- such as MACO Window-Matic, which is programmed for up to one month, - allow you to open and close windows at a given time. The functionality of such systems can be increased by installing additional touch sensors, thanks to which the doors will automatically close in case of strong gusts of wind or rain.
By using modern windows You can adjust the room lighting. This became a reality thanks to electrochromic glasses (developed by NREL - National Renewable Energy Laboratory), the transparency of which changes depending on the voltage applied to them. The Dutch company Reeg+ has gone further and offers glass with a photoelectric coating (Smart Energy Glass - SEG), which can not only change its transparency, but also accumulate solar energy. Scientist Sarbajit Banerjee from the University at Buffalo proposed coating glass with tungsten doped with vanadium oxide (V205).
Vanadium oxide can change the structure of its lattice depending on temperature, undergoing a so-called phase transition. At temperatures below +32°C, this connection is a semiconductor that does not transmit infrared radiation, but does not absorb it either. With more high temperatures The crystal lattice changes, the compound becomes a conductor and begins to absorb infrared radiation. Therefore, when glass with such a coating is very hot, it can act as a cooler, absorbing excess heat.
A few years ago, Samsung presented to the public its nano-development Transparent Smart Window, which is a 46-inch LCD panel with a resolution of 1,366 x 768 pixels and a contrast ratio of 500: 1.
Conventional LCD panels have a transparency of 5%, a Transparent Smart Window - 15-20 %.
This makes it possible to use the panel as a window. By controlling the device using widgets, you can make the window transparent, “close the blinds,” use Smart Window as a regular touchscreen for “computer” tasks, and watch videos.
During the day, external light is used as illumination; at night, the built-in LED backlight is turned on.
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