Security alarm for a home, cottage, garage, greenhouse: how to install a simple alarm with your own hands. Features and installation of a GSM security alarm in the house with your own hands How to make a wireless alarm

In the modern world, it is almost impossible to do without security equipment - this is especially true for protecting your real estate from robbers who are constantly improving their methods of entering a house, apartment, cottage or garage. For such cases, electronic security systems in the form of alarms are effective. These security barriers minimize the likelihood of theft and allow the property owner to react in time to a dangerous situation. Today, many companies offer a wide selection of multifunctional alarms, as well as their installation and maintenance. Depending on the complexity of the security kit used, its cost will also depend, which can sometimes be quite large. If a home owner does not have the opportunity to purchase and install an expensive security kit, he thinks about how to make an alarm system with his own hands. It turns out that this is not such a difficult process - it is important to have at least a little understanding of electronics and electrical work, and making an alarm will not be difficult.

Advantages of a homemade alarm

Despite the fact that a homemade alarm system is created at home, it has a number of advantages that allow it to compete with factory-made security systems.

Firstly, the simplest do-it-yourself home alarm system can be implemented even from improvised means that are available in the household. Almost every home has an unused mobile phone, elements of actuators for various household equipment, etc. If something is missing, you can buy it for pennies at any radio market. The financial costs of a security system created at home are minimal.

Secondly, a homemade alarm can be easily changed in design at any time and modernized to suit changing operating conditions at the site. Not every factory security system can do this.

Flaws

No matter how good your security alarm project is, it is not without its drawbacks. The main ones include the following:

  • lack of built-in protection systems against various devices that are used by attackers to disable alarms;
  • the inability to connect such devices to security systems of security companies;
  • It is difficult to independently implement complex security configurations that include a wide range of security and functional sensors and actuators;
  • a homemade simple alarm system does not support the ability to conduct audio and video monitoring from a protected object;
  • Without basic knowledge of electronics, you won’t be able to make your own security system.

What types of alarms can you make yourself?

At home, you can independently implement several options for security systems that will solve specific problems in protecting real estate.

  • Motion sensor based alarm

A simple alarm for an apartment with your own hands can be created on the basis of a conventional motion sensor, which is equipped with lighting systems installed in entrances and on landings. If you connect a siren to such a sensor instead of a lighting element, you will get a basic security system that will sound a warning that someone is in the protected area.

  • Alarm systems based on ready-made kits

For those who don’t want to rack their brains about how to make a homemade alarm and what devices to use for this, you can use ready-made kits that are sold on every radio market. You will only need to draw up a diagram of the protected areas and purchase the appropriate sensors and actuators for this. In the future, you will have to install the purchased elements and configure them to perform the appropriate security functions.

  • Alarm based on magnetic contact sensors

For those who are thinking about how to make an alarm system at home that will respond to the opening of doors and windows, the option of magnetic contact sensors will be the optimal solution. A distinctive feature of such sensors is that they include two elements - the sensor base itself and a magnet, which must be in direct contact. As soon as this contact is broken, the light and sound device connected to the sensor will be activated.

Using an old, unused cell phone, a highly effective homemade security alarm can be created using GSM communication capabilities. With the help of such a security system, it will be possible not only to activate the actuators connected to it, but also to notify the owner of the house about the danger through a mobile communication channel, sending an SMS message to his mobile device or making a call.

For those who do not know how to make an alarm with their own hands and temporarily cannot afford to purchase a ready-made one, they can install a simulator of the presence of a security system. To implement the elementary circuit of an alarm simulator, you only need an LED indicator, two AA batteries, a current-limiting resistor and a housing for the location of the listed elements. The glow of the LED will indicate that the object is under guard - this should scare away thieves. But relying on security with such a dummy for a long time is not worth it - it’s better to figure out how to make an alarm yourself or buy it in a store.

Equipment for collecting alarms at home

A simple alarm system for a home can be built using the following set of devices:

  • a set of sensors - for a simple security system, these can be motion control devices at the site, as well as opening sensors;
  • siren and light-emitting devices - they will signal the activation of the security sensor;
  • regular switch - used to turn off the alarm;
  • autonomous power sources - these can be batteries or rechargeable batteries that will support the operation of the alarm system in the absence of power in the external network;
  • mobile phone – needed when creating a security alarm for a home with the function of notifying the owner on his mobile device;
  • a set of tools for installation work, conductors, mounting elements - with their help, the assembly and installation of an alarm system at home will be carried out.

Alarm creation process

The beginning of work on developing your own security system should begin with the creation of a project for the future alarm system. It will depend on him how to make a home alarm system so that it provides protection to all potentially dangerous areas. After drawing up a detailed plan, you should take care of the availability of the required devices and parts, some of them may be at home, and some will have to be purchased.

At the initial stage, the appropriate sensors are installed around the perimeter of the object, as planned in the project.

Note!

In order for the security alarm to perform its functions when they are triggered, actuators and mechanisms are connected to the sensors.

They can be connected through a specially prepared circuit, which includes an electronic turn-on delay timer and switching relays. In this case, the DIY security system will not work immediately, but after a set period of time, which is necessary so that the owner of the apartment can disarm it. For this procedure, you need to install a regular push-button switch, which must be located in a hidden place so that the thief cannot independently disable the security before the siren turns on.

One option for creating an alarm yourself:

If a do-it-yourself alarm is created for notification via a cellular network, then the sensors must be connected via a mobile phone, which, in parallel with the activation of the siren, will send an alarm signal to the owner.

Why is it beneficial to use a homemade alarm system?

By designing and creating an alarm system with your own hands, the user adapts it as much as possible to the specific operating conditions in his home, as well as to the tasks solved by the security system. Not every ready-made alarm from the kit can be optimally suited to specific conditions, and it is not always possible to upgrade it.

conclusions

The simplest DIY alarm system can be created in a fairly short time with minimal financial costs. But the protective effect it provides is quite high. This guarantees the owner the confidence that his property is not in danger.

Modern society is simply unthinkable without security alarms. A security alarm can be either a fire alarm or a regular one that works against intruders. It all depends on where it is installed and what functionality it should carry. Do-it-yourself GSM alarm is a relatively inexpensive and quite effective solution for protecting a garage or home.

Now there are a large number of companies ready to install alarm systems, including GSM. The design of such systems is not as complicated as it might seem at first glance. The main thing is to understand some of the nuances and it is quite possible not to resort to the help of third parties, but to make an alarm yourself. It will cost much less, and its constant maintenance will depend only on you. That is, you can repair it and carry out service yourself.

If you want to do it right, do it yourself

The most widespread use of such alarms is in the garage. The simplest homemade GSM alarm system will help solve a number of problems and give you confidence in the safety of your car.

What do you need to have to make an alarm yourself?


If you look closely at the above list, you can come to the conclusion that the cost of the future system is low. A DIY security alarm like this will last a long time if you follow all the following steps correctly.

Installation work

A good GSM alarm with your own hands will work for a long time and correctly if you follow the following steps step by step:


  • In cases where shutdown and hangup coincide, you need to solder a wire to this button. The second wire is soldered to the number key, which corresponds to the shortcut function. This is where your phone number is dialed. As for the hermecon, you need to use one that has a standard circuit.
  • In cases where the shutdown and hang up do not coincide, it is necessary to solder another wire to another button. In this case, one of the wires will be common. As for the hermecon, the one with three contacts is used.
  1. Proceed with the installation of the closed circuit, working with the diagram. It is necessary to install a magnet on the garage door, and then adjust the reed switch so that contact with it means an open circuit.

The resulting security alarm works quite simply. If the garage door begins to open, the contacts are closed using a reed switch. As a result, a call comes to your phone. This serves as a wake-up call.

It is important to note that before starting installation, you should consider how to do the work so that the security alarm is least noticeable to prying eyes. In addition, all elements must be protected from moisture.

The list required for installing an alarm system includes a switch. It just serves to turn the system on or off. Everything is very simple and functional.

You will immediately be able to appreciate the main advantage of installing such an alarm system. The fact is that it does not depend on the electricity network. You will only need to timely charge the mobile phone used in the system. There are batteries that can hold a charge for more than two weeks. By the way, similar mobile phones with batteries cost from 890 rubles and more.

In garages that have an electrical network, the adapter can be mounted directly into the network. Then you will need to ensure that there are no power outages.

A nuance that is important to know

If thieves get inside your garage, which is equipped with an alarm, they can quickly find it and turn it off. In this case, the alarm has a certain time for it to go off. This lasts literally a couple of seconds. At this time, the process of establishing a connection with the phone number of your mobile phone is underway.

When the door is quickly closed, the call is immediately dropped. In order to prevent this, you can install another device to the magnet. It will have to prevent the magnet from opening the circuit.

The simplest option is to build a system in which the magnet will move slightly to the side when the garage door is opened. In this case, the magnet and reed switch will not touch, and the circuit will not be open. You can return the system to its normal state if you simply move the magnet to its original position.

Currently, it is also recommended to install a video surveillance system. But these are additional expenses. In most cases, it is enough to have a DIY GSM alarm system, which will help you find out in time that a stranger has entered the garage.

The article provides a diagram of a simple security alarm, a description of the operation, and resident software (firmware). The device is not difficult to assemble with your own hands. All the information necessary for this is in the article.

General description of the device.

The security alarm system is assembled on a PIC controller PIC12F629. This is a microcontroller with 8 pins and a price of only $0.5. Despite its simplicity and low cost, the device provides control of two standard security alarm loops. The alarm can be used to protect fairly large objects. The device is controlled by a remote control with two buttons and one LED.

Our company has moved to a new building. An old security alarm remained from the previous owners. It consisted of an iron box with red LEDs and a siren above the front door and a broken electronic unit.

I installed a small circuit board in the alarm box and turned this junk into a modern, reliable burglar alarm. Currently it is used to guard a two-story building with a total area of ​​250 m2.

So, the alarm provides:

  • Monitoring of two standard security loops with measurement of their resistance and digital filtering of signals.
  • Remote control (two buttons and one LED):
    • turning on the alarm;
    • disabling the alarm using a secret code
    • setting a secret code (the code is stored in the internal non-volatile memory of the controller);
    • indication of operating mode by the remote control LED.
  • The device generates time delays necessary for dialing a secret code, closing room doors, etc.
  • When an alarm is triggered, the device turns on the sounder (siren).
  • The operating mode of the device is also displayed by an external light source.

The block diagram of a security alarm looks like this.

The following are connected to the main security alarm unit:

  • 2 security loops with
    • NC – normally closed sensors;
    • NR - normally open sensors;
    • Rok – terminal resistors.
  • External sound notification and mode indication unit.
  • Backup power supply.
  • Power supply 12 V.

Security alarm loops and sensor connections.

To monitor sensors (detectors), the device uses standard security loops. The resistance of the loops is controlled. If the circuit resistance is greater than the upper or less than the lower threshold, then an alarm signal is generated. The normal resistance of the loop is equal to the terminal resistor (2 kOhm). Thus, if an attacker breaks the wires of the loops or short-circuits them, the alarm will go off. It is not possible to disable security sensors this way.

This device has the following loop resistance thresholds selected.

Those. The loop resistance in the range of 540 ... 5900 Ohms is considered normal. Any resistance value outside this range will trigger an alarm.

Connection diagram of sensors (detectors) to the security loop.

Both normally closed (NC) and normally open (NO) security sensors can be connected to one loop. The main thing is that in normal condition the circuit has a resistance of 2 kOhm, and when any sensor is triggered, it causes an open or short circuit.

To increase the noise immunity of the system, the device digitally filters loop signals.

In principle, everything should be clear. The following are connected to the PIC12F629 microcontroller:

  • Two loops through RC chains R1-R6, C1, C2, providing
    • formation of loop power supply;
    • analog signal filtering;
    • coordination with the input levels of the PIC controller inputs.

To determine the resistance of the loops, a microcontroller comparator is used. An internal reference voltage source is connected to the second input of the comparator. The reference voltage source (VS) values ​​for comparison with the upper and lower resistance threshold values ​​are set by software.

  • Through the RC chains R7-R10, C3, C4, two remote control buttons and an LED are connected through the current-limiting resistor R11. The device provides digital filtering of button signals to eliminate bounce and increase noise immunity.

It is worth explaining the purpose of resistor R17. The GP3 input of the microcontroller has an alternative function - 12 V power supply for programming the microcircuit. Therefore, it does not have a protective diode that limits the voltage at the level of the supply voltage. When the voltage is 12 V at this pin, the microcontroller goes into programming mode. Resistor R17 reduces the voltage at the GP3 input.

  • Through two transistor switches VT1, VT2, the microcontroller controls the siren and external LED indication. Because these elements can be connected with a long cable, the transistors are protected from line surges by diodes VD4-VD7. Transistor switches allow switching currents of up to 2 A.
  • The 5 V voltage for powering the PIC controller is produced by the D2 stabilizer. Don't ignore the VD8 LED. Its functions include not only indicating power, but also creating a minimum load for the microcontroller. If the PIC controller consumes a current of less than 2-3 mA (for example, in reset mode), then the 12 V voltage through resistors R8, R10 can raise the microcontroller supply voltage above the permissible level.
  • The inputs for the 12 V power supply and the backup power supply are isolated by diodes VD2, VD3. A Schottky diode is used as a diode VD2 in order to provide priority to the power supply when the voltages are equal to the backup power source.

I assembled the device on a board measuring 54 x 45 mm.

I installed it in the housing of an old alarm system. I only left the power supply.

The remote control is housed in a plastic case measuring 65 x 40 mm.

Software.

Resident software is developed in assembly language. The program cyclically resets all variables and registers. The program cannot freeze.

You can download the firmware for PIC12F629 in HEX format.

Controlling the security alarm from the remote control.

The remote control is a small box with two buttons and an LED.

It is better to install it indoors near the front door. Using the remote control, the alarm is turned on and off, and the secret code is changed.

Modes and control.

When power is first applied, the device goes into ALARM DISABLED mode. The LED does not light up. The device remains in this mode during the working day.

To turn on the alarm (ARM mode), you must press two buttons at once. The LED will start flashing rapidly, and after 20 seconds the device will go into ARMED mode, i.e. will begin to monitor the status of the sensors. This is the time it takes to leave the room and close the front door.

If you press any button during this period of time (20 seconds), the device will cancel the security mode and return to the ALARM DISABLED mode. People often remember something just before leaving a building.

20 seconds after switching on, the device will go into ARMED mode. In this mode, the LEDs of the remote control and the external display unit blink approximately once every second. In ARMED mode, the state of the sensors is monitored.

When any security sensor is triggered, the LEDs begin to flash rapidly, and the alarm system counts down the time after which the siren will sound. This time (30 seconds) is necessary in order to have time to turn off the alarm by typing the secret code on the remote control buttons.

There are 2 buttons on the remote control. Therefore, the code looks like a number made up of digits 1 and 2. For example, code 121112 means that you need to press buttons 1, 2, 1 and 2 three times in sequence. The code can have from 1 to 8 digits.

If the code is entered incorrectly or incompletely, you can press two buttons at the same time and repeat the code.

When the code is entered correctly, the device goes into the ALARM DISABLED mode.

If the correct code has not been entered within 30 seconds after the sensor is triggered, the siren turns on. You can disable it by typing the correct code. Otherwise, the siren will sound for 33 seconds and then the device will turn off (enter ALARM DISABLED mode).

It remains to explain how to set the secret code. This can only be done from the ALARM DISABLED mode.

Both buttons must be pressed for 6 seconds. Release when the remote control LED lights up. This will mean that the device has entered the secret code setting mode.

Then wait until the LED goes out (5 seconds). The device will go into ALARM DISABLED mode, and the new code will be saved in the internal non-volatile memory of the microcontroller.

Because Since the device microcontroller is clocked from an internal low-precision oscillator, the indicated timing parameters may differ by ±10%.

Security alarm states.

Mode State
LED
Transition condition Switch to mode
ALARM DISABLED Doesn't light up Short press of two buttons Waiting for SECURITY (20 sec).
Hold two buttons pressed for 6 seconds Setting a secret code
Waiting for security

It is necessary to go out and close the front door.

Flashes quickly Time 20 sec SECURITY
Press any button (cancel) ALARM DISABLED
SECURITY Flashes once per second Sensor triggering
Time to turn off the alarm with a code (30 sec)

Necessary to turn off the alarm by dialing a code

Flashes quickly Correct code entered ALARM DISABLED
The correct code was not dialed within 30 seconds Siren sound
(anxiety)
Siren sound (alarm) Flashes quickly Correct code entered ALARM DISABLED
Time 33 sec ALARM DISABLED
Setting a secret code Constantly lit Dial code ALARM DISABLED

In practice, working with an alarm system comes down to actions.

  • Leaving the premises. Press two buttons at the same time and close the door within 20 seconds.
  • Upon entering the room. Dial the secret code within 30 seconds.

Disadvantages, possible improvements.

The device can be easily modified for your own specific conditions. All improvements concern only the hardware. They do not affect software.

  • It is advisable to install two sirens. One in the external indication and warning unit, the other in a hard-to-reach place. The current of the transistor switch (2 A) allows this to be done.
  • It would be necessary to protect the siren wires from short circuits with a transistor current stabilizer. In the presented version of the circuit, an attacker can short-circuit the siren wires and when the alarm is triggered, a short circuit will occur in the power source.
  • If desired, you can connect powerful and high-voltage sources of light, sound, etc. through electromagnetic relays. The permissible current of the keys allows this, and the keys are protected against surges when switching the relay winding.
  • You can use a battery as a backup power supply by adding a simple charging circuit to the circuit.

External view of the installed alarm system.

Currently, only the front door opening sensor is connected to the device. I plan, over time, to add security sensors. Two loops are enough to protect our two-story building.

By the way, if only one cable is used, then a 2 kOhm resistor must be connected to the second one.

There are other options for device software on the site forum. There you can discuss and ask questions about this project.

Every person wants to live as comfortably and safely as possible. The desire to protect your home as much as possible from the entry of others is natural and reasonable. Therefore, technical methods of preventing cases of property theft through the use of security alarm systems are popular.

The development of microprocessor technologies, control devices, video surveillance and communications are making them increasingly accessible for security purposes for domestic purposes. However, attackers are also studying them, looking for effective ways to block or control them. Our tips will help the home craftsman securely and secretly install a security alarm system with his own hands for a house or apartment, disguising them from the view of a potential thief.


Principles of creating a security alarm

A few decades ago, a security alarm system worked using limit switches connected by wires to a power source and light or sound displays, but now it is a complex of various technical systems that operate autonomously and automatically. Security is created to notify the property owner of unauthorized entry into his area in order to take effective measures to suppress the crime.

For this purpose, approaches to protected property are divided into the following stages:

  1. access route control zone;
  2. fence, structural elements of the building: basement, walls, roof, windows, doors;
  3. interior rooms.


To implement them, a security alarm system is created, consisting of:

  • object control schemes;
  • a logic block that processes the information received by it;
  • siren sensors;

Each of these components, working autonomously, provides its own specific security and control tasks.

Methods of monitoring the security zone

Detector sensors react to the penetration of unauthorized persons in various ways:

  • video surveillance;
  • control of acoustic signals;
  • a break or change in the state of the electrical circuit;
  • mechanical impact and other means.

Detectors can be triggered by:

  • electrical contact;
  • magnetic field changes;
  • shock mechanical impact;
  • piezoelectric effect;
  • capacitive current;
  • optical-electrical conversion;
  • sound or ultrasonic testing;
  • combinations of several signals and other methods.

Surveillance sensors monitor the object:

  • a certain amount of space;
  • surface parts;
  • access line segment;
  • pointwise.

Reed switches - magnetic contact security sensors

So-called magnetic locks can often be found in store windows and on the entrance doors of premises. They allow you to attach the sensor with contacts and wires to permanently installed elements, and the adjacent magnet to the opening doors.


Security alarm sensors of this type are long outdated: they are mounted in a visible place, and it is easy for attackers to use an additional magnet, which will block the operation of the detector with its field.

Glass break sensors

Showcases and large glass windows attract intruders because they can be relatively easily broken and penetrate through the resulting opening into the security area.


To signal such actions, detectors are created that respond to:

  • mechanical shocks;
  • squeezing out with jacks;
  • heating glass with blowtorches.

The sensor is mounted, as can be seen in the figure above, directly on the controlled surface, which transmits mechanical or sound waves. They are detected by electric detectors of shock-contact and piezoelectric types.

Passive type sound sensors distinguish between two control modes:

  1. low frequency caused by the impact of a hard object;
  2. high frequency from flying fragments.

Infrared sensors

Two principles are used to work:

  1. passive temperature control of the security zone;
  2. active tracking of the state of a free segment in space.
Passive detectors

The work occurs through constant comparison of the temperature gradient in the directed zone. The appearance of a person or domestic animals in it is quite enough to send a signal.


Attackers, knowing the area or location of passive infrared sensors, manage to bypass them by wearing protective suits that block thermal radiation from the body. The firefighter's outfit is quite suitable for these purposes.

Active detectors

The receiver and transmitter of infrared signals in the security zone work in an integrated manner, constantly monitoring the passage of the control beam.


Since it is indistinguishable to the human eye, it can only be bypassed by knowing exactly its location or using special optical equipment.

Radio wave detectors

The operating principle of such a security zone is based on the emission of electromagnetic waves into the room and the simultaneous reception of signals reflected from the signals located inside it. At the same time, they are constantly compared.


When movement is detected in the controlled space, the balance between the adding signals is disrupted and a command is issued to trigger the sensor.

However, the disadvantage of this control method is that attackers, knowing about the presence of a radio wave detector, can simply move slowly in its area.

Capacitive sensors

The detector is tuned to the capacitive charge of the surrounding space and is balanced with the electromagnetic fields around it. When the human body finds itself in the zone of its influence, it destroys the created balance with its capacity. The sensor detects this moment and is triggered.

An attacker, when he knows about the principle of operation and the location of the capacitive sensor in the security system, blocks its action using electrical protective equipment of electrical personnel. A hard hat, rubber gloves, electrician's suit and specialized shoes will prevent it from triggering.

Combined type sensors

The use of several methods for detecting intrusion into a protected facility significantly complicates the actions of criminals. For example, the combination of a radio wave and a passive ultrasonic detector is still considered quite difficult to hack. Such a security zone is very difficult to overcome.


However, attackers are constantly studying all the technical details of newly introduced security systems and carefully developing measures to bypass and control them. This fact must be taken into account in your practical activities.

When using any security alarm, the main attention is focused on its hidden installation, closed installation, and the maximum limitation of persons who know about its operation. After all, even close people and family members can accidentally spill the beans and provide useful information to potential criminals.

Methods of operation of unauthorized access alarms

These devices can be assigned the following functions:

  1. scare away an intruder approaching a protected object by giving a light signal or blaring a siren;
  2. promptly notify the owner and security service about the entry of strangers into the restricted area so that emergency detention measures can be taken by the police team;
  3. or comprehensively solve several other control or security tasks.

Wired and wireless home communications, including Internet technologies, allow you to instantly transfer information to the owner of the building.

Logic block operation

It is created taking into account the effective use of the functions of the selected detector and siren for the contour tasks of protecting a private house or apartment.

If previously such systems were made by a home craftsman with his own hands from improvised materials using electronic circuits published in textbooks, now similar designs are available for sale with a fairly wide range of possibilities.

They are easy to customize to meet the individual requirements of local security using accessible programming tools. The operating algorithm includes all processes of receiving, processing, transmitting and recording monitored information.

Types of communication channels

Depending on the conditions of use, wired channels or wireless technologies based on the transmission and reception of radio waves are used.

It should be taken into account that the reliability of their operation depends on the quality of the electrical energy supply, its reliability, and once an attacker turns off the power to the house, the security alarm will be disabled.

To prevent this from happening, use either autonomous power supply from batteries or accumulators.

However, rechargeable batteries require constant monitoring of their technical condition and. Otherwise, they can also let you down by playing along with the attacker.

Security alarm from China

Well-known online stores in China provide a wide selection of electronic products for security purposes. Their kit includes:

  • Control block;
  • various designs of detectors;
  • additional accessories.

This composition should be studied and carefully analyzed before purchase.

Control module

Its appearance and composition of functions are repeated and at the same time different in different models.


On the front surface are usually located:

  • information display display;
  • push-button command input switches;
  • built-in speaker and microphone jacks.

Under the rear cover there is:

  • terminal blocks and connectors for connecting wires and cables of detectors and sirens;
  • module mode microswitches;
  • SIM card for .

Equipment manufacturers make control modules in a beautiful case, which can simply be hung on a screw or secured with adhesive tape to the wall near the front door. This convenience could end badly.

When an intruder enters an apartment, the first thing he will do is look for the place where the security alarm is installed. He will try to quickly disable it: tear it off its mount, throw it into the water, for example. Keep your secrets secret!

Detector

Structurally, the operating principle of the main types of sensors is described above, and their appearance is shown in the picture.


Inside the conveniently shaped case there is a battery and electronic boards with mode switches.

In addition to the security function, other detector sensors can work in the alarm set, for example, or even In this matter, each apartment owner or home master himself determines the list of necessary functions for his own needs.

Additional accessories

The following may be included as separate accessories:

  • various sirens;
  • remote control key fobs.

Sirens and spotlights

Due to their small dimensions, sound alarms can be hidden in the interior of rooms or niches of staircases, where they will fulfill their purpose - to scare off intruders and prevent cases of theft.


Small-sized floodlights have sufficient lighting power for a private home.

Keychain for security

Mobile control panels with small dimensions are convenient to store in a pocket or bag.

They allow you to control the operating modes of equipment from different places, for example, to turn off the motion sensor when your people are in the room, and leave the window and door sensors in operation.

How to set up a security alarm

The factory instructions determine the sequence of actions for putting each kit into operation

Antenna installation

If the logic block module uses an external antenna rather than a built-in one, then a special socket is installed for it.


The connection is made into this connector.

How to insert a SIM card

Installing a SIM card is fully consistent with the actions that we perform on a smartphone or mobile phone.

Getting started


When the power comes from the 220 network, you need to connect the adapter, and then move the toggle switch to the ON position.

Communication settings

You will need to “bind” the individual SIM card number to the control unit. To do this, use the factory password, for example, 8888 and the SMS sending mode.


Then connect an external siren and check the passage of signals between the blocks, starting from each detector by receiving an SMS on a mobile phone.

Once again, we draw your attention to the fact that all actions with the security alarm must be kept secret and not disclosed to unauthorized persons. We specifically showed that attackers quickly find hacking tools for any technical innovation.

Sometimes there is a need for an autonomous, inexpensive security alarm, for example, for protection in a country house. The use of industrial designs in such cases may not be economically feasible.

What do we need from an alarm system?
- Reaction to intrusion, for example with a passive IR motion sensor
- Intrusion alert with siren. The notification should work for a short time (for example, 5 minutes) and then turn off.
- After triggering, the system should go into standby mode again. If necessary, it should operate multiple times.
- low current consumption for long-term (6 months) operation in standby mode.

To make such an alarm we will need:

Passive infrared motion sensor. For example, a sensor purchased from OBI is a light switch. Price about 300 rub.
12 V siren. In particular, a 105dB model was used, you can use any other. Price no more than 200 rub.
Other small items: Battery holder, 6 V relay, insulating tubes, wires.

So. We need to remake the motion sensor, switching it from 220V to 12V. A superficial analysis of the circuit showed that the circuit can operate with supply voltages from 7–8 V to 30 V. With a 12V supply, it is necessary to set the relay to a voltage of 6V. (12 volt does not work). Let's open the sensor. The spherical part is removed if you bend one of the supports. The halves are held on by latches.


We remove the board. As you can see, the sensor is a passive IR receiver that responds to changes in the amount of IR radiation incident on it and a simple optical system. Sensor viewing angle is 180 degrees.


The points on the left need to be powered. The “+” is the positive pole and the “-” is the negative pole from the power source. We will connect the relay coil to the points on the right. Remove the standard relay (black box).


Due to lack of space inside the spherical part of the sensor, it was decided to bring the relay through the wires into the base of the housing.

Power is supplied to the sensor through a switch. When the sensor is triggered, it supplies voltage to the relay coil. The relay is triggered and its closing contacts turn on the siren. Thanks to the relay, you can connect a large number of sirens.


View from below. The siren and batteries are connected via terminals. Bottom left relay. Top right switch.



Complete system. ATTENTION! Do not use the siren without protecting your ears; despite its small size, it is very loud and can cause hearing damage.

In the end it worked out. In accordance with the regulator on the sensor, you can set the operating time of the siren after activation. From 10 sec to 8 min. Install the sensor indoors and take the siren outside. Unfortunately, after power is applied, the sensor is triggered, so it is reasonable to move the siren switch to a secret place and turn it on 5 minutes after turning on the sensor. The switch can be operated with a key, like the ignition switch of a car.

The sensor turned out to be quite economical. According to the ammeter:
Standby current 700 µA
Trigger current 1.1 mA
Siren current 200mA
A simple calculation suggests that 3.1 Ah is needed to operate for 6 months. The capacity of the alkaline battery is about 2.5 Ah. Therefore, for the winter you need 16 alkaline batteries mixed together.

Testing in the freezer showed that the system works even at -32

Added later: given our turbulent times and the autonomy of the system, it can be used to build a security perimeter in nature around a tent, for example.

Tests at the dacha showed:
1. Glare from water causes false alarms
2. You can seal the sensor with pieces of isolette tape so that blind spots are formed.