GSM-signaling with their own hands. Autonomous GSM alarm system

This article provides an opportunity to obtain information about the ways in which GSM autonomous signaling is collected, installed and maintained. Each device of this type almost always works on the basis of a special module. In fact it is the same mobile phone, but without the keys, the screen and the case. 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 acquisition of which is limited for a wide range of consumers. Descriptions of the principles of assembly of such devices are practically not found.

GSM-module with their own hands

Understanding the basic principles of the functioning of this type of signaling is necessary at the beginning of the arrangement of any object by a GSM installation. The devices consist of a control unit with corresponding outputs for annunciators and sensor detectors. When an alarm condition 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 corresponding alerts to security systems managed by law enforcement officers.

In addition to the above, GSM-signaling is able to activate light warning systems, sound sirens, and carry out mass mailing to several subscribers simultaneously. 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, the collected and configured homemade GSM (burglar alarm) in an ordinary apartment of a multi-storey building is considered. First, all the necessary sensors are selected. Often there is a demand for the possibility of controlling hired workers, for example, nannies. If it is planned to develop GSM-signaling for the protection of industrial or commercial objects, in addition to the device for noise recognition, a motion detector and devices sensitive to shocks and breaking glass, as well as sensors for monitoring smoke and interaction with magnets, will also be needed.

Sensitive elements transmit a signal to the GSM-module in case of opening of entrance doors, damage to windows or attempts to enter a protected room by any other means. Then, depending on the set up settings, the siren is activated, alerts are sent to the programmed numbers, lights are turned on, or several functions are simultaneously performed. If GSM-signaling with their own hands was collected and correctly installed, it is necessary to activate it each time before leaving the territory of the protected facility.

Glass breakage sensors

At this stage, we have to choose 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 appears on the glass, which can be noticed if you look closely.

If the entire surface of the glass is damaged, the sensor transmits a signal to the control unit, which immediately starts executing all of the above-mentioned possible actions. In order not to damage the surface appearance of the grid, new internal audio detectors are used for installation, which are sent to the windows. Such devices are characterized by an unmistakable distinction between the sound of a breaking glass and any other objects.

Smoke detectors

Setting up GSM-signaling using smoke detectors will always be relevant for all kinds of protected objects. It is desirable to install additional devices to neutralize the fire. When creating an alarm yourself, you can add a huge number of different devices to the system. It should be understood that the number of connectors on the GSM-module is limited, and the choice should always be made wisely.

Allocation of devices

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

GSM-signaling, manually installed, always requires a choice of location for the location of the control unit and antenna. If you integrate it, the detector should be placed at the minimum possible distance from the window. If the antenna is portable, its installation will have to be done in the zone of the best reception of the signal fed from the main station. The control unit can be installed in the most convenient place. It is recommended to install on sections of the wall that are inaccessible to small children.

Using an old mobile phone

The development technology is very simple. On the button 1 of the mobile phone there is an icon of the recorder. If you hold on for a long time, you can call the number specified in advance. This is the principle of GSM-signaling.

The installation instructions for the mobile device are nothing complicated. The processor scans the state of the button. To close the contacts, a low-power optocoupler will do.

The output pulse is fed to the middle contact, the signal level is checked. Galvanic discharge from external elements is in excellent agreement with the phone's schemes. The optocoupler is soldered to the contacts by short conductors and fixed to the mobile phone.

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

GSM - burglar alarm with installed interface scheme

This method allows the use of a signal that is fed to sound notification devices. The output of the comparator LM311 will open after a while after the capacitor has been set to 7 volts. After the comparator starts, a current flows from the resistor to the optocoupler. In this way, a call is made.

With the help of a resistor, you can adjust the duration of the delay to activate the comparator. This is intended to prevent false calls during a short-term alarm. The pairing scheme is placed on a small board and installed together with the auto charger in one housing.

Connecting a secret

There can be situations where a password is scanned, a keychain with a key is stolen from the owner, or a hack is cracked so that the GSM signal does not work. With his own hands, anyone can create a so-called secret. To connect it is not difficult. The contact of the device for powering the LED is output to the interface circuit. If after the start of the engine during the time when the capacitor is set, do not press the secret button, a call is made.

Full handsfree

This technology is used only for car alarm schemes. A full HF system can be used instead of a charger. Such devices provide power and fixing of telephones, improving the quality of communication due to the antenna, two-way loud-speaking communication.

For Nokia, the original CARK91 system can be used. Installed GSM-signaling with their own hands will be improved thanks to such a device. An auto-reply feature is added. When you set the minimum volume, everything will be audible clearly. The microphone is installed in the cabin. The system itself can be placed in the fire extinguisher department.

Conclusion

Finally it is worth adding a few words about how the assembled GSM-signaling should look like with your own hands. The circuit necessarily includes all of the above sensors. The detectors and annunciators must correctly connect to the ports of the program module.

Install the system at home until the completion of the repair work. In another situation, one should use the help of specialists to avoid creating additional problems for themselves. After strobeniya walls there are always a lot of construction debris, dirt and dust in the living room.