This paper proposes a novel bidirect i o nal anti-theft alarm scheme through detecting the magnetic field.The theoretical background and analysis of the approach of anti-theft alarm are pre sented.The circuit of burglar alarm is designed,fabricated and tested,and C language program is implemented and debugged.Feasibility of the de veloped scheme is proved by the experiments.
This paper proposes a novel bidirectional anti-theft alarm scheme through detecting the magnetic field, The theo- retical background and analysis of the approach of anti-theft alarm are presented. The circuit of burglar alarm is designed, fabricated and tested, and C language program is implemented and debugged. Feasibility of the developed scheme is proved by the experiments.