Visitor Identified Doorbell Circuit

Published:2011/7/8 1:07:00 Author:Joyce | Keyword: Visitor Jdentified , Doorbell | From:SeekIC

Here, a visitor could be a family member, an acquaintance or a stranger. The reason why the doorbell can differentiate the identity of visitors is not only due to the special design of the circuit structure, but also taking advantage of the psychology and the common habits of people. The doorbell can be divided into three groups: single button, two buttons and three buttons. To strangers who don’t know the inside well, he won't press two or three buttons at the same time, but he will press one of buttons, which will not trigger the doorbell.



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