Distributed Guarding and Alarming System Based on Telephone Automatical Dialing and Remote Communication Technology

Circumstance data of building such as fire accident smoke, robberpsilas body information, temperature and humidity signal, etc is acquired by different kinds of sensor unit. Single chip microprocessor (SCM) AT89C51 processes data signal collection and realize telephone automatically dialing-alarming when there is unusual condition, as well as it controls wireless transceiver chip nRF905 to complete data transmission between monitor controller and work central station controller. Upper PC of manager is connected with work central station controller though USB interface, which realizes distributed safety monitor and guarding-alarming system of intelligent building design. The experiment result reveals that system performs well as expected. This paper mainly introduces component selection, system structure, part of hardware circuit and software program design in detail. This system can be applied into circumstance monitor of grain depot, labor, and library, etc, which has broad application prospect.