How to make a home burglar alarm

Most property owners prefer to protect their property with an alarm system that transmits an alarm to a mobile phone. You can make a security system for your home with such a communication channel with your own hands, you only need to study its structure well.

Features of GSM alarm using a mobile phone

GSM alarm system is equipment that transmits a message about intruders entering a house via a mobile communication channel. Moreover, this alarm can be received not only by the owner of the real estate, but also by an employee of the security company with whom a special contract was signed.

An alarm alerts the landlord via telephone

The system sending a message about breaking into the phone is not much different from other security alarms. Its main elements - the central unit and sensors - are considered as original "sensory organs". So, each device in the system reacts to a particular irritant. The one that is mounted next to the door is triggered when it is opened, and the device installed next to the entrance to the house detects movements. The task of these devices is to notice some kind of “event”, and “tell” the radio control system about it, which will allow them to go home within a few minutes.

The central unit, which acts as the signaling brain, receives a signal from the sensor and acts according to the plan:

• makes a call to the owner of the property;
• sends a letter message to his phone;
• makes the siren sound.

Information is transmitted exclusively via the GSM network.

Remote control of a telephone connected to a security system is possible provided that the micro-control is mounted.

Application of the security system associated with a mobile phone and other devices

The system is installed in cases where the owners of the house or garage need to be informed about events such as:

• penetration into the home, garden, garage of unauthorized persons;
• power outage;
• smoke in the room;
• gas leakage from a gas pipeline in an apartment;
• water leak;
• lowering room temperature;
• the need to disconnect a household appliance, such as a heater, from the mains.

Video: how to make a water leak alarm

Wired Alarm Components with GSM Module

Having decided to build such a security system yourself, prepare:

• An old push-button telephone (for example, Nokia 3310) - the basis of the alarm;
• sealed switch (reed switch);
• a conventional battery charger (or a capacitive battery for a phone);
• long wire;
  

  According to the chain, information about hacking reaches a button on the phone

• soldering iron;
• material for soldering metal;
• magnet;
• additional sim card.

The phone should be ordinary, push-button

Installation of security system elements in a private house or in the country

All GSM alarm components, that is, a switch, a reed switch opening in a magnetic field, and a telephone button, must be connected in series. The process involves performing certain tasks:

1. The “quick call” function is configured on the phone using any button for this. She will call the number of the owner of the property at the time of the alarm response to any incident.
   

   For setting, you can select the number "2"

2. At the cell-phone, they open the lid, and carefully remove the keyboard board.
   

   To create an alarm you have to work on the keyboard

3. On the pulled out part, the contacts on two buttons are exposed. One of them is responsible for resetting the call, and the other is for the quick dialing of a certain number.
   

   Open buttons require wires

4. The wires are soldered to the button to turn off the telephone conversation, and they are connected to the switch, the function of which is to activate and disarm the security. Two wires coming from the keyboard are connected by soldering to the reed switch of the standard circuit.
5. If different buttons are responsible for resetting the call and completely disconnecting the phone, then wires are soldered to them, which are connected to a three-pin reed switch.
   

   The security system connection depends on how the telephone works.

6. The system is connected to a charger that is powered from the network.
   

   You can use a battery to power the device.

7. The reed switch is installed near the door on which the magnet is mounted, opening the circuit when closing the opening.
8. The rest of the system is hidden.

The assembled device must be checked. It should function as follows: the reed switch responds to the opening of the door and closes the contact of the telephone button, which immediately makes a quick dial of the number of the property owner. Having accepted the call, the owner of the object will hear what happened in the guarded place.

If desired, such an alarm can be made talking. The main condition that must be met in this case is that the microphone in the phone you are using is in good working order.

Video: help in creating and connecting a GSM sound alarm for a garage

DIY alarm with a time relay

If it is necessary to include a relay in the alarm system that provides a certain sequence of operation of the circuit elements, then the alarm installation is performed in a slightly different way:

1. A panel is removed from a simple cell phone.
2. Two wires are connected to the contacts of one button to quickly call a subscriber.
   

   The time relay acts as a component that transmits a signal to the telephone

3. The ends of the soldered wires lead out through the hole made in the phone.
   

   The connection diagram with the relay is slightly different from the usual

4. The wiring removed from the telephone is connected to a 12 V time relay.It will serve as a key that closes when voltage is received, and “pushes” the call button of the owner of the protected object.
   

   Relays can be purchased at the store.

5. Voltage is applied to the time relay, while the “plus” can be connected to the door lock, and the “minus” - to its weight.

The relay closes the telephone key

Video: homemade alarm using a controller

Disadvantages of homemade home alarm in the apartment

Despite the advantages of a home-made security alarm, such as assembly from improvised means, low financial costs and the possibility of upgrading the system, significant disadvantages are found in its use.

The main disadvantages of a self-made GSM alarm are:

• the lack of a built-in protective device, due to which attackers will not be able to turn off the alarm;
• ban on communication with a private security company;
• difficulties in assembly, especially if the system includes many sensors and actuators;
• the inability to record audio or video from the scene, even if the system is connected to a PC;
• the need to be well versed in electronics.

Remember that it will not always be possible to repair a homemade alarm.

Reviews on the effectiveness of a home-made security system with motion sensors

He was engaged in gsm-alarms, but they didn’t put them on cars, but on rooms, ATMs, etc. The essence, I think, does not change, sensors are installed similarly, for example, on doors, windows, connected to the device with a SIM card, which sends signals. It works, it sends signals quickly, but a lot depends on the operator and the installation location of the device so that nothing interferes with the signal or blocks it. Convenient, there is feedback, inexpensive. The only drawback is the dependence on the operator, which may have failures and the signal may be delayed. For example, in the New Year, when the network is overloaded.

GSM alarm - just right. It is wireless, that is, no one can cut the air. The trick is that it works the way you want to configure it. It is possible to certain areas, for example, to move, when the doors and windows suddenly began to open without your knowledge, or someone broke. She reacts to a fire, or rather, to the presence of smoke, to gas too. All information is programmed in the central unit. You can include everything there. I left the house, set it on a signal, you can control from your mobile phone. Through the access code, you can turn it on and off.

I would not say that GSM alarm is so good. Here it depends on which side to evaluate, because for the pros such an alarm is a tidbit. And on this side there are more disadvantages than advantages. Poor communication, an unlimited number of jammers, unskilled installation and numerous failures. I do not know, there are alternative methods that are much more interesting than popular alarm systems.

Video: how to make an alarm with sound for the front door

Is a project necessary for home-made alarms (with a cell phone, relay, laser)

Thinking of installing a security system in a garage or other property, the first thing they decide is the development and execution of documents. The project, created by professionals, will help you to easily set an alarm for employees of a special company. True, the owners of the houses that made the security system on their own are not sure that they need documentation.

An urgent need to create a project arises when installing a GSM alarm system in a public place. Without documents, supervisors will refuse to accept the facility. But the security system in the house, garage, cottage or other privately owned real estate does not need to be shown to specialists. Therefore, you can do without project documentation, having compiled just a layout of sensors.

DIY laser alarm in a country house

The security systems with laser radiation are also popular. Such an alarm is triggered after an object enters the range of the beam.

Circuit diagram

The circuit for such an alarm can be composed with the inclusion of a laser emitter and a timer NE555, which controls the functioning of all elements of the system. As a laser receiver, a photoresistor is usually used, in which a small resistance is created during irradiation, and in its absence changes to the greater side occur, which leads to the inclusion of an audio signal.

Due to the complexity of the circuit, installing the system may seem difficult

Alarm installation with laser pointer

In order for such an alarm to work, you will need to install:

• a laser pointer that generates a beam;
• photocell, that is, a device with varying resistance;
• a relay connecting system elements with a siren;
• mounting hardware;
• body parts;
• switching conductors;
• tools and materials for soldering wires and parts.

Installation of a laser security system is as follows:

1. To the relay contacts connect the wires coming from the sound siren and photocell, and the power line of the emitter.
2. The laser emitting special light and the receiver are mounted parallel to each other so that the beam goes to the center of the photocell. In this case, the sensor is placed in a black tube in order to close it from the room light sources.
   

   The beam from the device acts as a sensor

3. The button responsible for turning on and deactivating the system and the wires are positioned so that they are not visible, otherwise the attackers will be able to extinguish the alarm signal.
   

   The button is mounted opposite the beam producing device.

Advantages and disadvantages of the laser system

The advantages of laser signaling include:

• high mobility, because the elements of the system can be easily transferred to another place;
• stealth from intruders;
• the ability to connect both to the siren and to the console of the security company;
• use to create a system of improvised tools.

Among the disadvantages of laser signaling are:

• high cost of parts;
• difficulties in installation and configuration.

Video: how to make the simplest DIY laser alarm

There is no complete certainty that a home-made GSM alarm system and a laser security system can guarantee complete security, no. Still, such devices have a minimum of functions, and in quality they are far behind professional counterparts.