Today you will learn how to make a homemade GSM alarm from a cell phone. Such a security system can guard your dacha, garage or car.

This article has been planned for a long time, it is a “mobile GSM add-on” to . After reading the article to the end, you will learn how to make a cellular alarm out of any existing alarm system, but more on that a little later..

This add-on implements a notification function on a cell phone and allows the owner to control the situation about the “integrity” of the protected object anywhere in the world using mobile communications. Such an alarm system is the cheapest option and requires only an investment in an old cell phone, a battery + some parts, solder and free time.

Materials and tools required for the manufacture of GSM alarms:

• Nokia 1100 cell phone (or any other mobile phone with a shortcut function that !Attention! implemented by pressing the button once and holding it in this position).
• headset (headphone with microphone) used for audio monitoring of the room
• soldering iron
• solder
• the wire
• reed switch (or push-button door open sensor)
• 12 Volt acid-gel battery (the larger the capacity, the longer the “autonomy” in case of a 220V network outage)
• battery charger

The principle of operation of a homemade mobile alarm system based on a cellular phone

Ways to connect a cell phone to an alarm system:

The methods described above to establish interaction between a security alarm and a cell phone are valid for any alarm system. Thus, you can “attach” a GSM notification to any existing alarm system (for example, to a standard car alarm). Only one thing is required from it: close the relay contacts, or supply 12 Volts during “triggering” (for example, you can take 12 Volts from the terminals of a car siren, only then you will need to set up the “quiet mode” so that when arming or disarming the alarm the alarm will not “ quack" based on what option you have, choose the appropriate scheme.

How to organize uninterrupted power supply for GSM alarm systems.

We have figured out how the alarm system can interact with a mobile phone, there is one more issue left to solve - to ensure the phone is powered uninterruptedly 24*7. There are several options available:

In the future, I plan to write a number of articles on the topic of security systems: how to make a security system from a video recorder with internet alert and an article about the types of sensors for, which will help make the protection of your apartments, garages, and cottages more complete and reliable.

I wish you success in creating an alarm system, as well as the safety of your property!

Installing a GSM security alarm in a country house, garage or private house allows you to ensure the safety and security of property. Control is carried out via telephone, and to install it yourself you need to master all the features of the system.

Operating principle of GSM alarm

GSM signaling is a complex of devices that are interconnected by the GSM network and interact via a signal. Elements of the complex are installed on site, and control and reception of signals is carried out using a landline or mobile phone located by the owner. This way you can receive alarm notifications about unauthorized people entering a protected facility. The system is controlled using the same principle, but to do this you need to send the necessary signal from your phone. As a result of this, fire extinguishing systems can be activated at the facility, electronic locks and other elements can be controlled.

Scope of application of the security system

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

Depending on the model, the devices perform the following functions:

• ensuring fire safety of a cottage, garage or other facility;
• monitoring the availability of electricity in the network;
• monitoring leaks and shutting off water valves;
• gas pipeline leak control and system shutdown;
• activation of the siren, as well as heating or watering in the area;
• listening to the premises;
• room temperature control.

The complex of devices can include various sensors, for example, to monitor the integrity of window glass or smoke sensors. This allows you to vary the functionality of the security system. Therefore, the GSM complex is optimal not only for a summer house, garage or private house, but is also used for greenhouses, private buildings under construction and other structures.

Device components for home and garden

A simple alarm option 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 operating principle of the entire complex. As a result, you can create an effective GSM alarm system for your dacha or garage with your own hands. This makes it easy to avoid the cost of purchasing expensive equipment.

The following components will be needed for the alarm:

• a simple push-button mobile phone in working condition;
• ready-made sensor or reed switch + magnet;
• switch;
• installation wire;
• soldering iron and solder;
• SIM card.

DIY system assembly

The security system complex assumes the presence of a control unit with outputs for sensors and sirens. The occurrence of emergency situations triggers commands that are pre-programmed. For example, if the integrity of window glass in a house is damaged, 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 a unit located in a guarded house.

First you need to determine what type of sensors are needed at the site. Devices that detect damage to window glass and are also sensitive to smoke and increased 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 work package includes the following stages:

Video: alarm with motion sensor

A simple system with a minimum of parts is convenient, but a motion-sensitive alarm system is more effective. The system is easy to create with your own hands, and video recommendations allow you to master the work process.

Time relay system

GSM alarm schemes with time relays are different, but simple options are easy to create with your own hands. In this case, a 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 one relay is present, deactivation is carried out manually, that is, with the alarm disable button.

Video instructions for creating a time relay

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

Disadvantages of a homemade system

Simple assembly, cost-effectiveness, easy operation and the ability to increase functionality are the advantages of a homemade alarm system for a country house, garage or private home. 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 correct installation of each element;
• a complex system requires careful planning.

Reviews from experts

Experts' opinions on the effectiveness of homemade devices vary. The location of the facility, as well as the type of system, is important. The presence of a siren often makes an alarm a method of scaring off intruders, but before creating a system it is worth taking into account the feedback of specialists. Commentary on the effectiveness of homemade devices is sparse, but contains 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 playfully jump to a height of 2 meters, and the attacker does not climb on his belly (you can’t even open a closet in this position!), then the alarm is completely 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 their apartment, including motion sensors. They have 2 cats that walk all over the apartment, and there were only 2 false alarms, and both times when the cats knocked over massive objects (once their 4-story house), the 2nd carpet was rolled up in the corner. So the main thing is to configure it correctly...

Mikhail Karpov

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

DIY project: yes or no?

There is no need to create a project when installing a homemade 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. In this case, it is worth determining the location of the main unit, as well as the placement areas of all sensors. A schematic representation of the entire system allows you to quickly make an alarm yourself.

Laser alarm

A homemade laser alarm system 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 terminals drops below the reference voltage at the other terminal. In this case, the voltage level at the output of the first operational amplifier increases, and the resulting pulse can be used to turn on a siren, spotlight and other devices.

Scheme 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 your electronics skills. 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, laser, LED light bulb, capacitor, 47k resistors, photoresistor or LDR. Installation includes the following stages of work:

Advantages and disadvantages

Laser signaling has such advantages as efficiency, long range, reliability and rapid response to emergency situations. To create a system with your own hands, you need simple elements that are easy to purchase. The source of the laser beam is a regular pointer that produces a beam of red or another color. The ready-made device makes the assembly process simple.

The alarm system has such disadvantages as the complexity of the assembly circuit, which requires knowledge and skills in the field of electronics. It is important to correctly install and connect additional elements in the form of a timer or other devices to the system.

Video: installation of laser alarm

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

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

This is the simplest type of country alarm. It consists of the housing of the sensor itself and an external permanent magnet. The body of the security device must be mounted on a door or window opening, the magnet must be attached to the window or door. When the window is closed, both housings are nearby, and the alarm contact in the reed switch is closed, as it is affected by the magnetic field. When a thief opens a window, the magnet moves away from the sensor body and an alarm signal is sent to the siren circuit.

GSM alarm system is designed to be used for remote monitoring of protected objects and notification of the owner of the dacha via GSM communication channels (mobile phone). GSM video surveillance of dachas creates a completely new level of security and control - via MMS, GPRS or 3G cameras. Now the owner of a garden plot will receive more information if the protection is triggered. Also, the owner of the dacha has irrefutable evidence of the incident in the form of pictures from a connected camera or recordings. In this collection we will consider several options for do-it-yourself gsm alarms.

If a wood stove or other gas equipment is installed in the country house, then it is advisable to take care of installing a gas detection sensor. By the way, it’s easy to make an alarm system based on it yourself.

Carbon monoxide or carbon monoxide, CO (not to be confused with CO2) is one of the most dangerous combustion products. It is part of almost any smoke and is released during the smoldering of absolutely all organic or carbon-containing compounds. This is a deadly gas and an alarm about its presence will be relevant both in the country and in a private home. Carbon monoxide has no odor at all, which negates its detection by the senses. A person can understand the presence of carbon monoxide in the inhaled air only from the first symptoms of poisoning, and in many cases this is already too late.

Using the popular Arduino board today, you can create a budget wireless alarm system for your home, apartment or cottage. At the same time, this alarm is very easy to repeat and is recommended for both beginner radio amateurs and more advanced Arduino users.

The principle of operation of laser signaling is as follows: when an object enters the area of ​​effect of the beam, the laser stops illuminating the photodetector. The resistance of the latter increases sharply and the relay turns off. The relay contacts also turn off the laser. This is a variant of the simplest scheme. When a laser beam acts on a photoresistor, its resistance tends to zero, and when the laser is turned off, its resistance increases sharply and significantly. The photoresistor must be placed in a closed housing.

As observations of the operational reports of the Ministry of Internal Affairs show, the largest number of thefts from closed premises are committed through opening the door. Even having a safe door with English locks will not provide complete protection. Therefore, to reduce the risk of theft, I recommend installing a homemade alarm on the door, which will play the role of active protection. And experienced thieves, seeing a homemade product, cannot know what it is capable of and will choose another object to attack. A country door alarm is an excellent option for additional protection of your country house from unwanted visitors.

There is no smoke without fire, as the old Russian proverb says. It is on this principle that fire detectors work to detect fire by smoke in a country house. The sensor contains a camera with a diode and a photodetector. When smoke enters it, the strength of the diode radiation changes, which serves as a signal for the fire detector to operate. The use of a smoke converter, compared to a temperature sensor, allows you to find out about a fire much earlier and, accordingly, allows the owner of the dacha to take measures to extinguish or save his property. Protecting your dacha from fire is an urgent option for any owner.

With the onset of spring, the owner of a summer cottage wants to quickly find out about possible flooding of the basement. Also, when supplying water to a country house, you want to be sure that there will be no leaks into the subfloor, since this will significantly reduce the service life of the floor joists.

Let's consider a diagram of a simple homemade country alarm system that can be used in various rooms or containers. For example, these signal sensors are very often used to detect possible flooding of a summer house basement or garage cellar with melt water or in the kitchen under the sink, etc.

www.texnic.ru

Do-it-yourself alarm system - for a summer residence, alarm scheme, description of the scheme

Dear visitors!!!

In the summer, many of us prefer to be at our dacha, secluded from the bustle of the city, spending our time growing vegetables, fruits and berries, and some are directly passionate about the work of beekeeping, that is, breeding bees and obtaining the final productive results - collection, sale of honey and technology for breeding bee colonies. But this topic has nothing to do with various hobbies, running your own household, and as you understand, we will talk here about security alarms, which are necessary for both:

• summer cottage;
• garden plot in a private house,

The same goes for protecting your beekeeping farm.

Description of the scheme

Here is a simple electronic circuit, parts of which are freely available in specialized stores. The diagram, as you can see, consists of:

• two transistors;
• resistor;
• batteries;
• push-button switch;
• capacitor

and dynamics.

To assemble this circuit you must have:

• n-p-n (T1) silicon transistor MP 111;
• silicon p-n-p transistor (T2) MP 40;
• MLT resistor from the BC series;
• paper capacitor 0.1 µF;
• speaker 1 GD-39

and a push-button switch (from a table lamp).

fence perimeter

A thin copper wire is stretched along the perimeter of the protected area (fence), the ends of which are connected, as shown in the diagram, to the input terminals (in). When the copper wire breaks, the speaker emits a sound signal. This signal can be changed by selecting the capacitance of the capacitor.

Elements for an electronic circuit

All the necessary elements that will be required during assembly and installation of elements on the circuit board are shown in the photographs:

silicon transistors

capacitor paper resistor MLT

4.5 Volt battery push-button switch

speaker 1GD-39 (from the radio)

To make a ready-made so-called motherboard yourself, the circuit itself (tracks) is applied directly to the printed circuit board blank - with nail polish. Everything else is etched with “ferric chloride” and your circuit is ready for mounting electronic elements; the necessary holes on the board are made with an awl.

That's all for now. Follow the section.

zapiski-elektrika.ru

How to make an alarm with your own hands at home?

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 the owner of the house 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.

DIY door alarm option

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 will allow you to 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 based on motion sensor with battery

• 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.

Alarm circuit based on magnetic contact sensors

• Mobile phone based alarm

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.

Mobile phone based alarm circuit

• Burglar alarm simulators

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 it’s not worth relying on security for a long time with the help of such a dummy - it’s better to figure out how to make an alarm yourself or buy it in a store.

LED dummy circuit

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 a function of alerting the owner to 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 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.

bezopasnostin.ru

How to make a security alarm for your home with your own hands

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:

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 proper safe operation. Once an intruder turns off the power to the house, the security alarm will be disabled.

To prevent this from happening, alternative power sources or autonomous power supply from batteries or accumulators are used.

However, rechargeable batteries require constant monitoring of their technical condition and proper recharging during operation. 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:

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

The structural principle of operation 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, the alarm set can include other detector sensors, for example, water leaks or even light for a twilight switch. 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 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 to install a simple and inexpensive security alarm. Without unnecessary bells and whistles that manufacturers add to it in order to expand the functionality of their system and somehow distinguish it from other competitors. A cottage, a garage, a household outbuilding or even a greenhouse; in such places it is not always advisable or profitable to install a full-fledged security system.

In this article we will look at several devices that claim to be simple and accessible to anyone who wants to protect their property from intrusion by uninvited guests.

What should such an alarm be able to do?

• react to an intrusion (some external influence - movement, the door was opened, hit, etc.);
• sound a sound signal to scare off the intruder;
• have the ability to arm and disarm;
• It is advisable to consume little electricity.

The purpose of this device is not so much to block access to the house, but rather to scare away the thief. Having heard a loud signal, he will not want to take risks and will not climb into the room; in addition to the psychological impact, it may also attract the attention of neighbors.

Security alarm based on motion sensor

The simplest security alarm for a home can be made with your own hands based on a conventional household motion sensor for lighting, which is installed in entrances to save energy. But instead of a lighting lamp, you can install a siren.

What will you need for this?

• Motion Sensor– you can buy it at any hardware store, for example OBI or Leroy Merlin. It is necessary to pay attention to the operating voltage of the sensor - we need it to operate from a 220V network; the viewing angle depends on the external design of the sensor (wall-mounted or ceiling-mounted) and the lens used (can be wide 180 degrees or corridor type). Average cost from 400 to 800 rubles;
• Siren operating from a 220V network. For example, PKI-3 “Ivolga-220”, average price 250 rubles. Can be purchased at radio stores;
• Regular switch, to turn off the alarm. Any will do, from 100 rubles. and higher.

The connection diagram is shown below:

You need to choose a motion sensor that has at least two types of adjustments - time adjustment (TIME) and sensor sensitivity (SENS). Using the first one, it will be possible to set the activation time of our alarm, i.e. siren sounding time. This value is usually set for five minutes. The second adjustment changes the sensitivity of the sensor, for example, if it does not respond to you or to reduce so-called “false alarms”.

A switch will be needed to turn off the device when you are in its field of view and turn it on when you leave the room. It is advisable to install the switch covertly, so that after activating the security alarm you will not fall within its range of action. In addition to the siren, you can also connect a regular light bulb for double impact on the intruder.

The main disadvantages of this implementation will be that some models of motion sensors, after being turned on, require from 1 to 10 seconds to “stabilize” and switch to standby mode. If you come across such a sensor, you need to add a time relay to the overall circuit, which will keep the siren turned off while it is turned on.

There are also miniature motion sensors on sale that operate on 12V, for example, model DD-03. You can also create a simple alarm on them, but you need to connect it to a 12 volt power source or a battery. Thanks to this, the system will be non-volatile and work even if there are power outages.

Security alarm from a ready-made kit

The simplest security device based on an autonomous alarm system can operate wirelessly. In stores for radio amateurs you can find two options - based on an infrared sensor (aka motion) or a magnetic contact sensor that reacts to opening. True, the choice is not large enough and you will often have to go shopping to find the product “in stock”. Therefore, the easiest way to purchase this product is to order it in one of the large online stores.

Kit based on an infrared sensor.

An example is the Chinese alarm system under the loud name “Alarm mini”. Consists of the IR sensor itself, a mounting bracket and one or two key fobs. The kit includes clear instructions for installation and operation. 4 AA batteries are purchased separately, but can also be powered by a 6V power adapter (sold separately). Installing it yourself is not difficult.

After inserting the batteries into the device, you need to install the unit itself in such a place that its lens is directed towards the protected area. The front panel has an infrared receiver window for controlling the alarm from remote controls. A lens that “detects movement” in the controlled area, operation lights and a siren.

We press the button on the remote control - the green LED lights up, which means the exit report has started (15-20 seconds), so that we have time to leave the apartment. Then the green eye goes out - the device has started working. Now, as soon as there is any movement in the room, a person will pass, a dog or cat will run, the red LED will light up and after 15-20 seconds a very loud siren sound will be heard. The device is working!

A set based on a magnetic contact sensor.

A security alarm based on an opening sensor is a main unit that contains a sensor with open contacts and a magnet for closing these contacts. You need to set them up against each other so that there is direct contact between them. If a thief breaks into the house, when a door or window is opened, these elements move away from each other and an alarm siren sounds.

Such an alarm can be used mainly to scare off intruders and its main advantage is its low price, about 100 rubles per sensor. And very simple installation, there is adhesive tape on each part, just remove the protective layer and stick the sensor on the front door or window.

Often such kits are used to protect the perimeter of the house while you are inside, for example, sleeping at night. The sound of the siren will wake you up and you can take any action to protect yourself.

Burglar alarm simulator

In urban multi-storey buildings, it is becoming popular to set the apartment on security; in this case, expensive equipment is purchased to protect against intrusion, and the signals are transmitted to the remote control of the security company. But not every owner can afford this, and it’s not always justified.

Remember on cars such a device, under the windshield, usually near the steering wheel, there is a red LED that flashes or is constantly lit? He warns that the car is under guard. Likewise, for an apartment or cottage, there are similar designs or, in other words, burglar alarm simulators. They are designed to scare away unprepared and unprofessional thieves or burglars.

To make such a simulator, you need to buy a red LED (for example, this AL307), a mounting box to house it, a 100 Ohm resistor, a switch and a compartment for two batteries. For the entire set you will need to pay approximately 100 - 200 rubles. Depending on the characteristics of the LED, a current-limiting resistor must be connected to it in series. A radio store will help you choose the right resistor (unless, of course, you have a Soviet AL307 LED, as in our example).

When leaving the house, we turn on the constantly glowing LED, and when we return, we turn it off. Strangers will think that the apartment is on an alarm system.

The use of autonomous security alarms is common. There are many modifications of the wireless system, the configuration of which depends on the conditions of use, structural features of the area, and the requirements of the owner. The price range is different, the cost-quality ratio is acceptable. At the same time, homemade GSM alarm system based on improvised devices is also of interest, especially among those who are familiar with the basics of radio electronics.

GSM alarm system: buy or make it yourself?

The answer to the question depends on the requirements and requests made to the security installation. The variety of functionality and capabilities of wireless systems is wide. Additional equipment is provided by the design feature of this equipment. If desired, it is possible to organize an autonomous scheme that is optimally suited to a given object. First of all, this concerns the protection of private houses, country houses, city apartments, car garages, etc.

But there are cases when extensive functionality is not needed; it only complicates the use of the device. Here it is recommended to purchase simpler systems, with the necessary set of capabilities. It is not recommended to use the cheapest ones due to their low efficiency and low reliability.

If you have the desire, as well as knowledge from the field of radio electronics and radio engineering, it is possible to organize a GSM alarm system yourself. Equipment - the most basic tools, simple devices (for example, an old mobile phone, Arduino platform, GSM module, battery, etc.).

It is better to undertake the independent organization of a security alarm system by a specialist who will carry out high-quality assembly, with knowledge of many of the nuances. This model is suitable for installation inside a garage, car, or small warehouse. It is recommended to entrust the protection of serious objects (residential buildings, apartments, office premises, shops) to industrial models with remote control and an extensive circuit of connected sensors of various directions.

Homemade GSM alarm system from a mobile phone

Often, independent alarm systems are built on the basis of a mobile phone. Required set of tools and devices:

• Push-button telephone with speed dialing function (required).
• If you want to listen, use headphones with a microphone from a mobile device.
• Soldering iron, related materials.
• Wiring.
• Reed switch, magnet.
• Battery up to 12V (with external power supply to the mobile).

Sequencing:

1. Open the telephone menu, select “one-button” call settings, assign a mobile number (or group of numbers) to which a DTMF alarm signal will be received, behind a specific button (buttons).
2. Dismantle the phone down to the circuit board with the film glued on it.
3. Using a sharp knife, make cuts under the number that was previously determined in the menu settings for an emergency call. Lift the film, under it there is a metal membrane, which will subsequently close the contacts (grounding, “patch”).
4. Solder the wires to the ground, “patch”. To avoid false alarms, it is recommended to use the wires of one loop.
5. Seal the membrane to prevent shorting.
6. Install a reed switch on the device, a magnet on the door. To prevent the circuit from quickly opening when the door is closed, it is necessary to provide a mechanism that moves the magnet to the side.

Options for connecting the resulting device to the alarm system:

• Using a relay (normally open contacts).
• Using a biopolar transistor.
• Optocoupler. The most optimal option, creating a galvanic isolated circuit.

This video describes the circuit in more detail.

How to do it? Option on the Arduino platform

This scheme includes:

• Arduino platform
• GSM modem (SIM900A, SIM800L)
• Power supply, battery.

The system works simply. When a connected sensor (motion, infrared, etc.) detects intrusion indicators, it sends a signal to the system, putting it in standby mode. An alarm notification (predefined SMS message) is sent to the specified mobile number.

Detailed connection diagram is contained in the video

System power methods

• From a mobile phone battery. A simple option in which the lithium battery will always be 100% charged. Over time, this will lead to its failure.
• External power supply (battery up to 12 V). Connects to the phone's power terminals together with its battery. In this case, the charge will remain at 70%. When the main source of electricity is turned off, the cell phone battery will power the security device.
• Without a mobile battery (when the device is connected to an alarm system with its own power source).

Advantages. Flaws

pros homemade security system:

• Minimum cost of initial components compared to industrial options.
• Autonomous operation (only periodic recharging of the phone).
• Prompt response.
• Possibility to connect several subscriber numbers.
• Options for connecting touch sensors.
• Wireless installation.

Minuses:

• The system is easily blocked upon detection. Requires hidden installation.
• Local triggering.
• Suppression, signal modification.

The use of a DIY GSM system is justified when it is necessary to install a security device with minimal resources, and the significance of the object is not high. For a home, apartment, or office, it is best to use industrial security modifications that are more reliable, efficient, and functionally diverse.

Friends! More interesting materials:

Areas of application of GSM alarm systems
GSM Security Alarm: A Brief Overview
GSM security alarm system for a summer residence