Microcontroller based alarm system

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Dr. Iváncsy Szabolcs
Department of Automation and Applied Informatics

The objective of this BSc diplomwork is to design a PIC microcontroller based building alarm system.

A detailed market products’ description has been made to determine the design requirements, showing the available HAS, AM500, ABUS, FAZ 3000 and OASIS equipment.

Based on these alarm systems the technical criterias and the user’s interface were determined.

The microcontroller alarm system designed from individual integrated circuits has a hierarchical architect: central unit, remote sensor unit and remote control. The three units communicate with radio data transfer and the central unit can communicate with a remote PC using USB standard line.

In case of the used integrated circuits the main design principles are the low power consumption and minimum space requirement. The alarm system performs its tasks with the proper elements of the PIC 18F microcontroller family, with the RFM12(B) ISM frequency band useable radio transceiver and with the FT232BL UART-USB controller. These circuits and their application are shown in this study in details.

The design process deals with the power supply of each module at high priority to meet the criterias of battery supplied (minimum power) system. The detailed description of supply voltage stabilizers are found also in the study.

The application of different types of antennas used in the radio communication are presented in details also.

One separated chapter deals with practical troubleshouting of the designed units. The

detailed results belonging this work are presented too.

The study ends with the description of the software of the designed alarm system. Scheduling the time controlled and event initiated tasks is made by the „ round robin architect with interrupts” operation system.

The design circuit layout drawings, the data sheets of the main integrated circuits used and the operation software program code are attached to the study on a CD. The CD directory is identical with the List of Content of the study.


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