The design is the extension of the wireless anti-theft alarm system. The wireless anti-theft alarm has two parts. One is switchboard. The other is separate computer. The system is used in VGA line of alarm of projector. When the separate computer detect the VGA lost, the switchboard can receive the alarm information. The switchboard alarms and display the information.
The wireless guards against theft to report to the police the system switchboard design usage PIC16F73 the single a machine is a core, Usage PIC single a machine A/D the conversion feels to spread emulation in the machine signal conversion arithmetic figure signal, Judge whether VGA line is pulled out or not according to this signal, be the line of VGA is pulled out, the single a machine passes the a shoots with lead-in the mold piece will report to the police the information shoot to the host, the host receives signal usage machine proceed report to the police.This system has simple, practical, cheap etc. in cost characteristics, also can expand to used for the other situation report to the police.