GSM car alarm on Atmega16. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Security and alarm via mobile communication

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The device is designed to timely notify the owner of a car about a car break-in. The alarm monitors doors, windows, hood and trunk.

The alarm is triggered when one of the inputs is shorted to ground. This device has four security inputs. One entry for the driver's door, one for the other doors, one for the hood and one for the trunk.

After turning on the device, the driver has 25 seconds to get out of the car and close all doors. During these 25 seconds the LED will be off. If the driver has not exited within this time, or any door has been left open, the LED will be off until all doors and the hood are closed. After you close all the doors for half a second, the siren and headlights will turn on, and the LED will start blinking "saying" that the alarm has switched to armed mode.

If the passenger doors, hood, or trunk are opened in armed mode, the device will immediately go into alarm mode. The ignition will be immediately blocked and the siren will turn on. Also, the device will start calling the mobile phone of the owner of the car. In alarm mode, the LED will turn off.

If the driver's door is opened, the device will turn on the car siren after 8 seconds, block the ignition, and start ringing twice on the owner's mobile phone. Also, when the door is opened, the dipped (or high) beam headlights turn on, if desired, you can do so that the turn signals turn on. After the alarm is turned off, the ignition lock will turn off.

If the door or hood was opened and the siren worked, then the subsequent closing of the door or hood will not affect the state of the device, that is, the siren will still ring, and the device will ring the owner's mobile phone.

After 40 s. the siren and headlights will turn off, and the device will re-check the loops, if all the doors and the hood are closed, the alarm will switch to armed mode again. If the loops were violated for the second time, the device will go into alarm mode, but after turning off the siren and headlights, the device will no longer go into armed mode, and the LED will remain off, "saying" that the loops were violated twice.

(click to enlarge)

For the operation of the security alarm, any mobile phone with the function of quick dialing of numbers preprogrammed into the memory is required. To call a number, use your own hot dial keys. In 90% of phones that come across already have this function by default, you only need to "activate" it, i.e. write down the required number for dialing in the cell. As a mobile phone, I used an old, supported Simens A 55 phone. But any phone that has a quick dial function can be used in the device. Relay pins 3 should be soldered to the speed dial button on the phone. The mobile phone will be charged using the car adapter.

The call will be made as follows:

After the sensors are triggered, the device "presses" the speed dial button. The phone will ring until the owner presses the end button on their phone.

The device uses an ATMEL microcontroller, which is quite cheap and readily available. Relays can be used for any 12 V. The device is turned on and off by means of a switch, which will be hidden in a secret place, for example, under the dashboard. The device is connected to the vehicle's on-board power system. The button is placed in the power circuit, and must be located in a secret place!

If necessary, you can change all the time delays, as well as the parameters of the device itself, by changing the firmware that is flashed in the MK. You can also change the number of guarded loops and their properties.

For firmware and contact the author! The author will answer all your questions. Do not forget to indicate the name of the device in the letter, or rather, provide a link to the device, and please indicate your valid e-mail.

The author accepts orders for the development of devices on the MK

Author's e-mail: gsm-signalizacia[dog]mail.ru and gsm-signalizacia[dog]yandex.ru
ICQ: 395292062

Download Layot File

Publication: gsm-signalizacia.narod.ru

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