字数:8537.页数:23 范文编号:JD376 摘要 目前,市场上销售的电子门铃有各种类型,如有开关式、敲击式、双音式、感应式等,而家庭里常用的只有开关式和感应式两种。这里介绍的是一种实用的感应式电子门铃设计思路与制作方案。这款感应门铃的特点是不用门铃按钮,当门外的人用手接近或触及感应器一下,扬声器即会发出声音。 关键字:门铃,感应,定时器,扬声器 The electron door bell at present, selling on the marketplace has the various type, if having switching-mode , tunk style , double tone style , induced style and so on, that family lining is in common use only when switch style and induction are dyadic two kind. Introducing that here is that one kind of pragmatic induced dyadic electron door bell designs a train of thought and makes a scheme. This induced door bell characteristic is to disuse the door bell button , think that the external people of door uses hand to approach or touch the inductor once, the loudspeaker is to may emit a sound. Keywords: doorbell , induction, time, loudspeaker
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