Security system based on GSM phone. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Security and alarm via mobile communication
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GSM-security is by far the most promising and, devoid of many shortcomings, means of monitoring remote objects. The GSM radio channel security system is designed to provide security, fire alarms at remote sites.
The described GSM alarm system works together with almost any mobile phone. The phone is used as a GSM transmitter. In the event of an alarm, an SMS is sent or a call is made to the user.
(click to enlarge)
The design of the security GSM-system
The device is based on the Atmel ATTiny2313 microcontroller.
The device is powered from any of two sources: a GSM phone battery or an external power supply. When external power is on, the MK is powered from it and the phone's battery is charged, and if it is not available, from the phone's battery.
A programmer for programming the MK is connected to the J2 "PROGRAMMER" connector.
A mobile phone is connected to the terminals of the MK through the J3 connector. Data exchange between the MC and the mobile phone is carried out under the means of AT commands. The RxD and TxD lines of the phone are connected to the MK serial port. In addition to the RxD and TxD lines, the phone is also connected via the CTS, RTS, DTR lines, which ensures that the device works together with almost all mobile phones.
Sensors are connected to the PB0-PB7 pins of the microcontroller. Capacitors C8-C15 are installed to prevent the influence of RF interference on the sensor loops. The sensors are triggered by a break when disconnected from the common one, thereby preventing the possibility of cutting the sensor cables. Diodes VD3-VD10 protect the MK from getting high voltage from the sensor loops.
As one of the sensors (on diagram F8), you can use the sensor for the presence of external power supply of the security system.
In order for the user to be able to monitor the operation of the device, a signal LED VD2 is connected to the output of the MK.
With proper installation, the device does not require configuration and starts working immediately.
The device is assembled on a one-sided foil fiberglass, 30-35 mm in size, using SND components. Parts that are not installed on the board are installed by surface mounting.
Description of VD2 LED signals
a) is on - the device is powered;
b) 1 long 1 short - an error in data exchange with the phone (the phone does not support AT commands or the connection with the phone is damaged);
c) 1 long 2 short - connection to the phone is damaged (CTS line is damaged);
d) 1 long 3 short - no number in the first cell;
e) blinking - armed mode is on.
Arming and disarming can be done
a) "dumping a call" from a specific phone to the phone of the security system;
b) turning on switch S2 (code switch, etc.)
The security mode is turned off, it can only be in the same way as it was turned on.
When arming by "call reset", the output to which switch S2 is connected is set to logical "0". Thus, this security system, through the J4 "CSS" ("Central Security System") connector, can be synchronized with the operation of the central security system.
The mobile phone must be configured for the device to work.
a) In the first cell of the phone book on the SIM card, you must write down the number with which the security system will work (send SMS to it, call, turn on and off when the call is dropped only from this number);
b) In cells 1 to 8 on the SIM card, you need to write down SMS messages that will be sent when a certain sensor is triggered (In the first cell of the SMS of the first sensor, in the second - of the second sensor, etc.).
The security system works together with all phones that support AT commands
Simiens - all series except series A (series index above 35).
Sony Ericsson,
Samsung,
Nokia,
Motorola,
Alcatel etc.
Advantages of this security system over existing analogues
1. This system works with almost all GSM phones that support AT commands.
2. It is possible for users to enter SMS text themselves.
3. Turn the system on and off "by dropping the call" (not all phones support)
4. Synchronization with the central security system.
There are 2 firmware versions: DEMO (with a limited set of functions) and paid (contact the author for purchase)
DEMO Firmware Limitations
- there is no possibility to turn on / off the armed mode by "call reset"
- there is no possibility of synchronization with the central security system
- number of sensors - 1 (on PB0)
- no SMS sending when the sensor is triggered, only a call
- a maximum of 2 arming, after which a flashing of the MC is required
Download the DEMO version of the firmware, as well as the circuit board of the device in Layot 4 format here
All questions about the operation of the circuit, the acquisition of firmware, etc. you can ask the schema author: gsm-security@inbox.ru
Publication: cxem.net
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