一种密码门铃兼报警器电路的设计

目前,民户住宅多数门口都设有门铃,有人按门铃时,主人往往要观察是熟客还是陌生人后才决定是否应该开门,不是很方便。文中介绍一种密码门铃兼报警器,只有熟悉密码的人在限定时间内才能使门铃工作,乱按门铃按键则会报警;无人在家,强行撬门入室,同样会报警。因此它对熟人是门铃,对陌生人则是报警器。本电路还设有自动停报和强制停报功能,给使用者提供更大的方便。

A Kind of Password Doorbell and Concurrently Design of the Alarm Circuit

At present,a house and most gates of the people have doorbells,when someone rings a doorbell,the host just decides whether to open the door after often observing whether it is a frequent visitor or stranger or not,it is not very convenient.The paper Introduces a kind of password doorbell and concurrently alarm,the person who is familiar with the password makes the doorbell work in limiting time,the button will call the police to ring a doorbell arbitrarily;Nobody at home,if someone forces the door open into the room,the ring will give an alam too.So it is a doorbell to the acquaintance and it is an alarm to the stranger.This circuit has,park newspaper and park newspaper function by force automatically too,providing more convenience for user.