System Alerts GSM
In the home and industry … Application of these systems is truly boundless: from the security functions of the property and car alarm systems, intrusion protection and prevention of industrial enclosures, control car – scales, data PDF sensors, climatic parameters, alarm warning in the server … and much more. At the same time, the trend growth in the number of systems with multiple redundant communication channels, as just radio and GSM. Problem and solution Disadvantages just GSM – the link is obvious: it is non-guaranteed message delivery and payment cards, ie dependence on the operator. In those cases where you want to organize a communication channel for short distances, but the wires are undesirable (for example, in moving systems, temperature control systems, ladle wall …) – appropriate use of the radio channel.
You can certainly use the following solution: wi-fi access point -> wi-fi radio modems such as clients SST900 (family I-7000) -> data collection system … but what if it is expensive and redundant? It is "good" access point is not worth a penny (+ client cards), and industrial the more radio modems. Thus, we can form the basic requirements for the functionality of the device (intelligent service module): the maximum number of digital inputs – outputs Availability control outputs such as the UK (dry contact) the presence of channel GSM – Communications owning a channel that is not subject to licensing requirements first two provide the functionality of the controller to example ATtiny, and the addition of powerful output drivers (keys), while the latter – any GSM – modem (mobile phone) and integrated low-power transmitter range UHF ( 433 MHz). Among the other neurotransmitters, the most acceptable for costs were radios MICREL. Lack of wire-wrap mounted products – particularly pleased, most importantly – to sustain the antenna contour data 3.
Intelligent input module has 8 programmable channels that can be connect: IR sensors flooding motion sensors Sensors Sensors fire alarm break glass Any number of pins, buttons, reed switches included in series or in parallel to control the opening of doors, windows, etc. The module is powered by a battery connected phone, and with the loss of external power supply sends an SMS message "No power controller GSM". For practice, we should stock up as follows: IDE Studio4b460 compiler WinAVR-2005 Program – Programmer of the programmer PonyProg_205 LPT … in spite of its simplicity and installation of these things mounted device has proven itself very well! Dwell in detail to control the firmware itself does not make sense, since "all that is good – long-forgotten old" 6. One need only mention that the project was transformed under ATTiny2313 and compiled in WinAVR-2005 under our needs 1. Testing the stability of the connection was carried out receiver module based on micrf010 MICREL 5. In the industrial noise, stable communication distance was about 50m. Links: The source test system design Scheme (OrCad) and wiring of the module (GERBER format RS-274X) Specification transmitter mICRF102 Specification of the controller ATTiny2313 Website MICREL Third-party project GSM – Pager