Make your own zhsm alarm for the house. We make a GSM alarm system with our own hands from the phone. How to organize uninterruptible power supply of GSM alarm

This article makes it possible to obtain information on how an autonomous GSM alarm system is assembled, installed and maintained. Each device of this type almost always works on the basis of a special module. In fact, this is the same mobile phone, but without keys, screen and housing. Instead of these devices, connectors for sensors are attached to the main board. GSM modules are provided by such leading corporations in the mobile phone market as Siemens and Motorola.

A large number of high-quality professional security systems of foreign manufacturers are being developed, the purchase of which is limited for a wide range of consumers. Descriptions of the principles of assembling such devices are practically not found.

Do-it-yourself GSM-module

Understanding the basic principles of functioning of this type of signaling is necessary at the beginning of the arrangement of any object with a GSM installation. The devices consist of with appropriate outputs for sirens and detectors. When an alarm occurs, the device can be programmed to perform certain actions. Such control units are capable of processing voice messages, sending SMS notifications to owners of protected premises or appropriate alerts to security systems controlled by law enforcement officers.

In addition to the above, GSM-alarm systems are able to activate light warning systems, sound sirens, and carry out mass mailing of messages to several subscribers at the same time. You need to decide on the components that you plan to install. The quality of functioning and signaling capabilities will depend only on the developer.

Preparing for installation

As an example, we consider an assembled and configured home-made GSM (burglar alarm) in an ordinary apartment in a multi-storey building. The first step is to select all the necessary sensors. The ability to control hired workers, such as nannies, is often in demand. If it is planned to develop a GSM alarm for the protection of industrial or commercial facilities, in addition to a noise recognition device, you will also need a motion detector and devices that are sensitive to shock and glass breaking, as well as sensors to control smoke and interact with magnets.

Sensitive elements transmit a signal to the GSM module in case of opening the entrance doors, damaging the windows or trying to enter the protected area in any other way. Then, depending on the settings, the siren is activated, notifications are sent to the programmed numbers, the lighting equipment is turned on, or several functions are performed simultaneously. If the do-it-yourself GSM-alarm system was assembled and correctly installed, you must activate it every time before leaving the territory of the protected facility.

Glass break sensors

At this stage, you have to make a choice between reliability and aesthetic design. When you select the first property, the appearance of the window can change significantly. After mounting the sensitive device, a transparent grid will appear on the glass, which can be seen if you look closely.

In the event of damage to the entire glass surface, the sensor sends a signal to the control unit, which will instantly begin to perform all of the above possible actions. In order not to spoil the appearance of the surface with the mesh, new internal audio detectors are used for installation, which are directed to the windows. Such devices are characterized by an unmistakable distinction between the sound of breaking glass and any other objects.

Smoke sensors

Setting up a GSM alarm using smoke detection devices will always be relevant for any types of protected objects. It is advisable to install additional devices to neutralize the fire. When creating an alarm system with your own hands, you can add a huge number of various devices to the system. You need to understand that the number of connectors on the GSM module is limited, and the choice should always be made wisely.

Device distribution

In a residential area, the installation of sensors for detecting movement can be carried out in the kitchen, in rooms or in the corridor. The actions of any person who tried to enter the building without the knowledge of the owner of the apartment or the responsible employee of the enterprise will be immediately calculated by special security devices.

Do-it-yourself GSM-alarm system always requires a choice of location for the location of the control unit and antenna. If integrated, the detector should be placed as close as possible to the window. If the antenna is portable, its installation will have to be carried out in the area of ​​\u200b\u200bthe best signal reception from the main station. In this case, the control unit can be installed in the most convenient place. It is recommended to install on wall sections inaccessible to small children.

Using an old cell phone

The development technology is very simple. Button 1 of the mobile phone has a tape recorder icon. If you hold it for a long time, you can call the number specified in advance. This is how the GSM alarm system works.

Instructions for installing a mobile device is not difficult. The processor scans the state of the button. To close the contacts, some low-power optocoupler is suitable.

The output pulse is applied to the middle contact, the signal level is checked. The galvanic discharge from external elements is remarkably consistent with the phone's circuits. The optocoupler is soldered to the contacts with short conductors and fixed on the mobile phone.

A small remote button is used to perform the function of key 1. When an impulse is received, a call is made. The subscriber can listen to everything that happens in the room by pressing the call receive key. An ordinary charger is suitable for powering an integrated mobile phone.

GSM - burglar alarm with installed interface scheme

This method makes it possible to use a signal that is fed to sound warning devices. The output of the LM311 comparator will open some time after the capacitor gains 7 volts of power. After the start of the comparator, current is supplied in the direction from the resistor to the optocoupler. Thus the call is made.

With the help of a resistor, you can adjust the duration of the delay for the activation of the comparator. This is provided to prevent false calls during short-term signaling. The interface circuit is placed on a small board and installed together with the autoloader in one housing.

Connecting a secret

There may be situations when a password is scanned, a key fob is stolen from the owner, or a key fob is hacked so that the GSM alarm never goes off. With their own hands, anyone can create a so-called secret. Connecting it is easy. The contact of the device for powering the LED is displayed on the interface circuit. If, after starting the engine, during the build-up of power of the capacitor, the secret button is not pressed, a call is made.

Full handsfree

This technology is only used for car alarm circuits. A complete HF system can be used in place of the charger. Such devices provide power and fastening of phones, improving the quality of communication due to the antenna, two-way speakerphone.

For Nokia, the original CARK91 system can be used. will be improved thanks to such a device. Added the ability to auto-reply. When you set the minimum volume, everything will be heard clearly. The microphone is installed in the cabin. The system itself can be placed in the fire extinguisher compartment.

Conclusion

Finally, it is worth adding a few words about how the assembled GSM alarm should look like with your own hands. The circuit necessarily includes all of the above sensors. Detectors and sirens must be properly connected to the ports of the software module.

It is necessary to install the system at home before the completion of repair work. In another situation, you should resort to the help of specialists so as not to create additional problems for yourself. After that, there is always a lot of construction debris, dirt and dust in the living room.

Modern security systems for cars, of course, are reliable and quite effective, but additional protection in the form of a GSM alarm will never be superfluous.

A small device is able to warn the owner in time about an attempt to break into a car or, for example, into a garage where it is stored.

Principle of operation

Even the simplest do-it-yourself GSM alarm system provides many advantages:

• firstly, thanks to a mobile phone (the main element of the system), even in the event of a theft, the search for a car is greatly simplified;
• secondly, when you try to enter the car (garage), a message is sent to the previously programmed phone number. All that is necessary for the owner is to respond to the danger signal in a timely and correct manner;
• thirdly, the cost of all structural elements is minimal. Most often, you can meet the amount of up to 1-1.5 thousand rubles;
• fourthly, with basic knowledge of electronics, it takes no more than a few hours to assemble the circuit and test the device;
• fifthly, the security system will work even in the absence of power - on the battery built into the phone. In this case, the battery life can reach several days.

Depending on the complexity of the scheme and the skills of the motorist, the GSM alarm system can have the following functionality:

• send messages about various malfunctions in the car;
• automatically block the operation of the main components of the vehicle;
• manage the device in an unlimited range (the main thing is that there is a mobile network);
• give various commands (for example, to start the engine warm-up).

Best Options

If an autonomous GSM alarm system is what you need, then choose one of the options:

• buy a finished device in the store;

In the first case, you get a "black box" with a full range of functions (all that remains is to connect).

In the second - you have to do everything yourself. It would seem that the option of buying an already assembled alarm looks more preferable, but there is a big minus - the high price.

Therefore, if you have minimal skills in the field of electronics, a thousand and a half rubles in your pocket and some free time, then it is better to do everything yourself. Moreover, there is nothing complicated.

Option one

Of the component materials you will need: a push-button telephone (you can use the cheapest, but workable and with a good battery), a magnet, wires, a reed switch and a simple switch.

The assembly process itself is quite simple and consists of several simple steps:

• 1. Set the call to the desired number (for example, your mobile) to one of the buttons.

• 2. Remove the front panel of the mobile phone. This is necessary to gain access to the contact group of the device and connect the wires.

But there are several options here:

• - the function of receiving and rejecting a call is on the same key. In this case, one wire is soldered to it, and the second to the number that you assigned to call the required subscriber;

• - if different keys are used for the call and hang up functions, then it is necessary to solder a wire to each of the three keys and use a three-contact reed switch.

By the way, the advantage of this installation is that the phone will turn off along with the alarm, which can significantly save battery capacity.

• 3. The last step is to install the magnet on the door (garage or car), as well as setting up its operation.

The further principle is very simple: when the door is opened, the reed switch contacts open, and the car owner receives an alarm message about an intruder entering the car (garage).

A switch must be provided in the reed switch circuit, with the help of which the GSM alarm will be turned on or off by the owner. In this case, the location of such a switch can be chosen independently. The main thing is that the toggle switch does not catch the eye of intruders.

The advantage of such a self-assembled system is absolute autonomy. The main thing to think about is the issue of constantly recharging the battery.

An ideal option if the charger can be connected to the car's on-board network (in the case of installing protection in the garage - to the 220 V network through an adapter).

In this case, the constant recharging of the phone for a long period of time will be ensured.

The disadvantage of such a system is a slight delay in work, because it should take some time to call the subscriber.

If suddenly the attackers quickly entered the garage (got into the car) and closed the door, the circuit will be open and the signal may not reach.

But this problem can be easily solved - it is enough to equip the magnets with a special product that will prevent the circuit from opening again.

There are many options for solving the problem here. For example, one of the simplest is to install the magnet in such a way that when the door is quickly opened, it moves.

In this case, after closing the door, the circuit will not open immediately and the GSM alarm will do its job to the end.

Option 2

Here the scheme is a little more complicated, but the functionality is much richer than in the previous case.

Such a device is triggered when at least one input is closed to the "minus" of the car. At the same time, there are four security entrances in the alarm itself: for the driver's door, for all passenger doors, for the luggage compartment and, accordingly, the hood.

After turning on the power switch, you must quickly get out of the car (no more than 25 seconds are given). If suddenly the driver did not have time, then the controlling LED will not light up until all the doors, the hood and the luggage compartment are closed. As soon as the conditions are met, the alarm will go into armed mode.

When you try to steal and open one of the doors, the headlights turn on, and, if desired, the turn signals.

To turn off the alarm and remove all blockages, it is enough to turn off the toggle switch hidden in a special place.

In the case when the intruder immediately closed the doors after the alarm was triggered, the blocking is not removed. In this case, the owner of the car still receives an alarm call.

After 40 seconds, the control unit will interrogate all systems and, in the absence of triggered sensors, will switch to standard security mode. If, during the test, the opening of one of the doors is confirmed, the device goes into alarm mode.

As in the previous case, to implement such a scheme, you need to buy a mobile phone with the ability to quickly dial. In this case, the call will be made until the subscriber at the other end of the "wire" presses the reset button.

You can use an ATMEL product as a controller, although there are many analogues. Its advantage is affordable price and reliability. In addition, such a controller can be easily found on the market in your city.

Any 12 V device can be used as a relay. The toggle switch for turning the alarm on and off is also easy to find. At the same time, it is desirable to hide it away from prying eyes. The more secure the place, the better.

The toggle switch is inserted in the alarm power circuit from the on-board network.

Installation rules

In the process of installing such a device, you must consider a few simple recommendations:

• Firstly, before starting work, study the gsm signaling scheme and clearly follow all the recommendations. If you bought a ready-made device in a store, work only according to the instructions;
• secondly, to perform installation and connection of the device, it may be necessary to remove the instrument panel and dismantle the protective panels under the steering wheel;
• thirdly, turn off the power (to do this, just remove the terminals from the battery);
• fourthly, install the control unit (mobile phone) in close proximity to the fuses (this will greatly simplify the connection);
• fifthly, mount signaling devices and other sensors (if they are provided for by your circuit);
• sixth, carefully lay out the wires so that they do not interfere with the process of driving a car;
• seventh, connect the device to the on-board network.

Connection Secrets

From the moment of installation, the GSM alarm system guards your car, so every little thing matters. Moreover, there are a number of connection secrets that you need to know about during installation:

1. The main task is to provide independent power to the device, which can be turned off and on using a hidden toggle switch (we have already talked about this).
2. All wires must be laid in places where moisture never penetrates. This is necessary to avoid a possible short circuit and failure of the system.
3. Try to mount the main unit, sensors (if any) and wires as far as possible from the heating and vibrating elements of the car. Otherwise, there is a high probability of damage to the system and its failure.
4. The control unit of the device must be removed from the phone, car antenna and radio to avoid interference.
5. The places where the wires pass from the body to the doors or from the body to the hood must be additionally reinforced with special rubberized tubes to avoid creases and damage.

The installation of such an alarm is a responsible process, so the rush here is superfluous. Each connector must be cleaned with special care and carefully insulated to prevent dirt and dust from entering it.

findings

Thus, the GSM alarm system can become your reliable assistant in ensuring the safety of your own car.

It remains only to decide on priorities - to make the device yourself (by choosing one of the options) or to buy a ready-made system. But here much depends on the tasks set.

If an alarm is already installed in the car and an additional device is needed, then why not do everything yourself.

If the security system on the GSM principle is the only one, then it is better to mount a more functional protection or buy a ready-made device. In any case, it's up to you.

The result of the security system depends on the efficiency of the equipment used. Of course, even the most modern and expensive devices cannot give a 100% guarantee, but even a primitive system is capable of frightening off a robber, preventing him from taking out the most valuable things.

You can buy it, such samples are quite cheap. But many craftsmen prefer to assemble on their own. What is the result of this and how effective are such devices?

To find out the answer to this question, we will try to find out what a do-it-yourself GSM alarm system is.

The principle of operation of the security system

By setting an alarm, a person relies on the fact that she will be able to warn him in time about the intruders entering the premises and turn on light or sound devices that can draw the attention of others to the protected object. Any system will cope with such a task, but only if certain conditions are created for its operation. For example, for wired models, a prerequisite is the presence of a fixed telephone in the room.

Watch the video, the principle of the system:

And only one GSM alarm is able to work even with a power outage. Its principle of operation is to use mobile communications to transmit an alarm message to the owner. Structurally, it is a device inside which there is a SIM card, and a microphone can also be built in to listen to the object. Such a system is controlled by radio key fobs or via SMS messages.

Do-it-yourself GSM alarm system

It is not always possible to buy an expensive industrial model of a security system. In this case, many prefer to assemble the alarm on their own. Of course, there are many nuances in this issue, and the efficiency of the assembled equipment depends on how correctly it is resolved.

Fortunately, there are many GSM signaling models and schemes with a detailed description on the network. Moreover, the equipment assembled on their basis is practically not inferior in its efficiency to industrial designs. We will consider one of such simple do-it-yourself GSM alarm systems in this article.

We watch a video review, an alarm system for 10-50 rubles;

So, installing an alarm in an apartment, garage or country house is the right decision. You do not need to buy equipment, you can assemble it yourself. To do this, you will need a little knowledge in electronics, a set of parts and a soldering iron, as well as a gsm alarm installation manual instructions.

As components for such a system you need:

1. A push-button mobile phone that you no longer use
2. Magnet
3. reed switch
4. Wires and conventional switch

As you can see, the set of parts is quite small and does not require significant investments. Usually all this is already in every home, where the owner likes to collect various devices. So the alarm will turn out to be practically free.

Watch the video, the actual working scheme:

Now for the build process. It consists of a few simple steps.

First you need to set up a call to the subscriber, namely the current phone number of the owner, with one button.

You will then have to remove the front panel to gain access to the board and connect the pins. It depends on the version of the device. If in it the end and end functions belong to one button, then one wire must be soldered to it, and the other to the number key responsible for the call. Such a GSM alarm system is shown in the diagram below. In the case of using separate buttons for each function, separate wires are soldered to each of them and a reed switch with three contacts is used.

Visually, this process can be depicted in the form of two slightly different schemes:

If you carefully study the presented materials, you can see that this approach allows you to turn off the phone at the same time as the alarm. This saves battery life and does not require frequent recharging.

And then the simplest thing remains, after the chain is mounted, a magnet is installed on the door and the reed switch is adjusted. The operation of such a do-it-yourself GSM alarm is not much different from industrial models. When the door is opened, the reed switch contacts are closed and a call is made from the phone to the programmed number.

Arming and disarming are carried out using an additional switch. You can choose the location of its location and other devices yourself, the main thing is that they are not visible to outsiders.

The assembled GSM alarm system with your own hands is completely autonomous. The only condition for its operation is periodic recharging of the phone battery. It is possible to mount the charger in the electrical network of the room. In this case, the alarm will work with batteries only when there is a power outage.

The only drawback of such a system is the fact that it will take a couple of seconds to operate until a connection is established with the number. If the thieves manage to enter and close the door during this time, the chain will open and the alarm message will not come to you.

Let's look at another working scheme:

However, this can be avoided if the magnet is provided with an additional device that does not allow it to open the circuit again. There are many options for getting out of this situation. The simplest of them is to install the magnet in such a way that when the door is opened, it moves a little. In this case, nothing will happen on a quick close, as there will be no contact. The circuit turns off when the magnet returns to its original state. Installation of a self-assembled GSM alarm system is available to everyone.

The efficiency of home-made systems

A feature of such equipment is that all components for it can be bought and installed by yourself. Its main function is an intrusion alert sent to the owner's phone. The sensor installed on the door is triggered when it is opened, if desired, it can be located under the rug or flooring to respond to the weight of the person entering the room.

Do-it-yourself GSM alarm system has a lot of advantages, among them:

• Minimum cost, you will not find cheaper equipment
• Almost complete autonomy with periodic recharging of the phone
• No need to pull and hide wires in the walls

However, there are enough drawbacks to such an alarm. And one of the most tangible is that anyone can block her work. Yes, and it works only in a specific place, that is, when installed on a door, it will not react at all to penetration through a window.

Based on the characteristics of a home-made alarm, it is rather difficult to attribute its work to effective. Therefore, it is better to use industrial models that are more functional and reliable.

The choice of security system depends on the expected result from its use. Various alarm models on the market differ in capabilities and functions. But is it worth overpaying for complex samples, knowing in advance that they will not be useful. Unnecessary functionality only complicates the management of devices and increases their cost.

But experts do not recommend buying very cheap models either. The most they can do is turn on the siren, but will it scare the thief? Not always and not for everyone. Signaling complexes with radio sensors are also ineffective. Their signal can be easily jammed, even using a children's walkie-talkie.

The optimal model of the security system is the one that best suits the features of the object and the needs of the owner. It does not hurt to think in advance about a possible upgrade of equipment that may be required over time.

If you choose between an industrial model and a self-assembled one, then there are many nuances. For example, for a specialist in this matter, a do-it-yourself GSM alarm system will be assembled very quickly and may not be inferior to industrial models in terms of its effectiveness. At the same time, its cost will be several times lower. But if you do not have the necessary knowledge, then it is better to buy a finished model, because the safety of property depends on the quality of its work.

When deciding which model to choose, it should be clarified for what tasks it can be used. You can install a simple GSM alarm system yourself. In this case, you will know where the equipment is located and how it interacts, which will help to control the effectiveness of its operation.

It does not hurt to decide on the amount that you have to purchase a finished model or do-it-yourself assembly. After all, the functionality of the system depends on how reliable and effective it will be.

Which alarm system to choose - expensive, cheap or do it yourself? Everyone who cares about the safety of their property should answer this question for themselves. How well this issue is resolved depends on how calmly you can leave your apartment, going on a business trip or vacation.

Installing a GSM security alarm in a country house, garage or private house allows you to ensure the safety and security of property. Management is carried out by phone, and for installation with your own hands you need to master all the features of the system.

The principle of operation of the GSM-alarm system

GSM signaling is a set of devices that are interconnected by a GSM network and interact through a signal. The elements of the complex are installed at the facility, and the control and reception of signals is carried out using a fixed or mobile phone, which is with the owner. So you can receive alarm notifications about the penetration of unauthorized people into the protected object. The system is controlled according to the same principle, but for this you need to send the necessary signal from the phone. As a result, it is possible to activate fire extinguishing systems, control electronic locks and other elements at the facility.

Scope of the security system

Security systems operating over the GSM network are diverse and widely used in private houses, garages, summer cottages. The use of alarms for cars is effective, but such a system differs significantly from the complex for real estate. Small remote warehouses, industrial premises or other structures can easily be equipped with such devices. Functional alarm allows you to respond in a timely manner to a fire or damage to property, to prevent other unpleasant actions of intruders.

Devices, depending on the model, perform the following functions:

• ensuring fire safety of a dacha, garage or other facility;
• control of the presence of electricity in the network;
• control of leaks and overlapping of water valves;
• gas pipeline leakage control and shutdown of the system;
• activation of the siren, as well as heating or irrigation on the site;
• listening to the premises;
• room temperature control.

Various sensors can be included in the complex of devices, for example, for monitoring the integrity of window panes or smoke detectors. This allows you to vary the functionality of the security system. Therefore, the GSM complex is optimal not only for summer cottages, garages or private houses, but is also used for greenhouses, private facilities under construction and other structures.

Device components for home and garden

A simple version of the alarm system does not require the presence of complex devices, which allows you to create a security system yourself. In this case, it is necessary to understand the principle of operation of the entire complex. As a result, you can create an effective GSM alarm system for your summer house or garage with your own hands. It is so easy to avoid the cost of acquiring expensive equipment.

The following components are required for signaling:

• a simple push-button mobile phone in working order;
• finished sensor or reed switch + magnet;
• switch;
• mounting wire;
• soldering iron and solder;
• SIM card.

Do-it-yourself system assembly

The complex of the security system assumes the presence of a control unit with outputs for sensors and annunciators. The occurrence of emergencies triggers commands that are pre-programmed. For example, in case of violation of the integrity of the window panes in the house, the system is able to send an SMS message to the owner. Listening to everything that happens in the house is also possible when calling to the unit located in the guarded house.

First you need to determine what type of sensors are needed at the facility. Devices that detect damage to window glass, as well as those sensitive to smoke and rising air temperature, are in demand. Special motion sensors are also installed on the front door. After determining the types of devices, their location is selected.

The complex of works includes the following stages:

Video: alarm with motion sensor

A simple system with a minimum of detail is convenient, but a more effective signaling that responds to movements. The system is easy to create with your own hands, and video recommendations allow you to master the process.

Time relay system

GSM alarm schemes with a time relay are different, but simple options are easy to create with your own hands. In this case, the relay is necessary for the siren to sound, and the design may contain either two or one such element. In the first case, one relay activates the sound alert, and the other element turns it off after a set time period. The element has two groups of contacts. If there is one relay, the shutdown is carried out manually, that is, the alarm off button.

Video instruction for creating a time relay

GSM alarm system equipped with a time relay is functional and convenient. To master the rules and principle of operation of the relay allows the video, which presents the features of the installation.

Disadvantages of a homemade system

Simple assembly, economy, easy operation and the possibility of increasing functionality are the advantages of a home-made alarm system for a summer house, garage or private house. The system is not without drawbacks, which are expressed in the following:

• easy blocking of the alarm by unauthorized persons;
• malfunctions occur quite often;
• a large set of functions requires the correct installation of each element;
• a complex system requires careful planning.

Expert reviews

The opinions of experts about the effectiveness of home-made devices are different. The location of the object is important, as well as the type of system. The presence of a siren often makes the alarm a method of scaring off intruders, but before creating a system, it is worth considering the reviews of specialists. Comments on the effectiveness of homemade devices are few, but contain some key points.

When installing an alarm in an apartment with pets, it is worth considering the reviews of experts:

Motion sensors can be adjusted to a specific response height. If your cat does not effortlessly jump to a height of 2 meters, and the intruder does not climb like a plastun (in this position, you can’t even open the closet!), Then the alarm is fully justified. The main thing is that the installation is carried out by specialists who understand the subject well.

Andrey Kotousov

Motion sensors can be configured to trigger only if an object larger than a certain size moves in the room. It can be configured so that when moving an object less than 10 kilograms there will be no triggers. My relatives have an alarm system in the apartment, including motion sensors. They have 2 cats that walk all over the apartment, while there were only 2 false positives, and both times when the cats knocked over massive objects (once their 4-storey house) the 2nd carpet twisted in the corner. So the main thing is to set up correctly ...

Mikhail Karpov

https://answer.mail.ru/question/82855068

Project for homemade devices: yes or no?

There is no need to create a project when installing a home-made GSM alarm system. This is due to the fact that the system includes a minimum number of elements that are easily connected and interact with each other. At the same time, it is worth determining the location of the main unit, as well as the areas for placing all sensors. A schematic representation of the entire system allows you to quickly make an alarm with your own hands.

Laser signaling

A homemade laser alarm is an effective security system that is easy to operate. This uses more complex components than for GSM signaling. For example, a laser source, resistors and other elements are needed. The principle of operation of such a security system is that when the laser beam is interrupted, the voltage at one of the outputs drops below the reference voltage at the other output. At the same time, the degree of voltage increases at the output of the first operational amplifier, and the resulting pulse can be used to turn on a siren, searchlight, and other devices.

Schema selection

The alarm, the action of which is based on a laser beam, is created according to the scheme. There are many options of varying complexity. The choice depends on skills in the field of electronics. For example, an effective system with a timer is quite simple and is actively used to protect private objects.

System creation

To install a laser alarm with your own hands, you need to prepare a BT169 thyristor, a laser, an LED light bulb, a capacitor, 47k resistors, a photoresistor or an LDR. Installation includes the following stages of work:

Advantages and disadvantages

Laser signaling is distinguished by such advantages as efficiency, long range, reliability and prompt response to emergencies. To create a system with your own hands, you need simple elements that are easy to purchase. The source of the laser beam is an ordinary pointer that gives a beam of red or another color. The finished device makes the assembly process simple.

The alarm has disadvantages such as the complexity of the assembly circuit, requiring knowledge and skills in the field of electronics. Additional elements in the form of a timer or other devices are important to properly mount and connect to the system.

Video: installation of a laser alarm

Detailed video instructions allow you to master all the features of self-assembly. At the same time, the alarm system will be economical, high-quality and efficient in use.

The GSM security system or a laser complex allows you to ensure the safety of property and the safety of the facility. For a summer house or a garage, it is easy to create a system with your own hands, but it is important to follow the installation rules and use high-quality components.

Security and alarm systems are improving every day, and the need for them is only growing. As prices for new models are rising. If we take an average security system and consider it as a contender for installation in a house, a summer house or a garage, then it will be incredibly difficult to fit into 20-30 thousand rubles. Meanwhile, it is possible to make an alarm system yourself from the old trash that everyone has in the house. It will be a fully functional intrusion alarm system or an addition to an already installed system.

What is a GSM alarm

To begin with, it is worth understanding the types of alarms and the principles of their operation. It is possible that we will choose among them the most optimal option for a particular object. For example, if it is necessary to protect a cottage on the outskirts of a holiday village from burglary, then the sound alarm itself will not help much here.

Putting a house under remote protection is effective, but expensive. But do-it-yourself GSM alarm from the phone will be the ideal option in this case.

Types of security systems

In principle, today the most common types of security systems are:

Sensors - eyes and ears of the security system

Each of these systems makes sense only when it can respond to penetration, violation of the integrity of doors, windows, walls, to the presence of movement in the protected area. And for this, sensors are needed, of which there are several. The most expensive and not the most reliable is an ultrasonic sensor. It fixes the intruder quite accurately and accurately, but only if there is no interference. And no one can guarantee this. In addition, such sensors are quite expensive and difficult to install and configure.

The magnetic sensor is the most popular, simple and reliable. It is a magnet placed on a door or a window, and a reed switch, which, when in contact with the magnet, is in a closed state. As soon as the magnet leaves the field of view of the reed switch, the reed switch opens, giving a signal to the warning system. There are also infrared motion sensors. If the integrity of the IR beam is violated, the system works. Such sensors have a high percentage of false inclusions, since they can respond to any movement or vibration. Sometimes you can find vibration sensors that react to the presence of vibration when trying to destroy a gate, door or wall.

The simplest door opening sensor can be generally a cheap design - this is a group of contacts mounted on a door or on door hinges. When the doors are opened at least halfway, the contacts are closed, the GSM system is activated and the owner receives a call to the mobile phone. The most effective way, of course, is to install not one, but several sensors, connecting them using a special GSM controller shown in the photo below.

The principle of operation of GSM alarm

The principle of operation of a GSM system for a home or garage is simple and straightforward. Any mobile phone that has already served its purpose will be used as an active system. Our task is to make him call the owner when the sensor is triggered, but for this it is necessary that the balance on the card installed in the alarm phone is positive, and the phone itself is in the mobile operator's work area.

In order to assemble a GSM alarm system with your own hands, you will not need any special knowledge and a complex tool. Everyone who at least once in his life held a soldering iron in his hands can assemble such a system. Here is a list of the main tools and fixtures for assembling a signaling from a mobile phone:

• old but working mobile phone;
• reed switch and magnet, which will be a door opening sensor;
• soldering iron and soldering kit - solder, rosin, flux;
• ordinary household switch;
• phone charger;
• electrical tape, multimeter, wires.

How to assemble an alarm from a phone

First you need to make changes to the design of the old phone. Small, but they are needed. To start dialing the host number, as a rule, the standard green key is used. The desired number is entered and with each subsequent press of the call button, a call will be received not by the owner's phone. The button will work by closing the contacts. To do this, just remove the keyboard from the phone and solder two wires to the contacts of the call button, as shown in the photo.

In fact, the system is already operational. It remains to hide the door opening sensor, run a wire from it to the mobile phone, to those two contacts on the call button. The phone itself is installed in an inconspicuous place, it is also desirable to hide the wires, and connect the power supply, phone charger, to the network. The beauty of a simple system is that it will not lose performance even in the absence of current in the network - the battery of a mobile phone can last quite a long time without recharging.

Such a system has, of course, its drawbacks. The fact is that it takes several seconds to operate, that is, exactly the time that a mobile phone needs to make a call. This drawback cannot be called critical, therefore, in principle, the system is fully operational and can be used for home, for summer cottages, for garages, as the main or as an additional GSM system that duplicates an autonomous, already installed one.

We hope that the alarm, assembled by hand from a mobile phone, will not disturb the owners too often, and its undoubted advantage can be considered the price and absolute efficiency. Successful work!