2012届毕业生 毕业设计说明书

题 目: 物体远离报警器设计 院系名称： XXXXXXXXX 专业班级： XXXXXXXXX

学生姓名： ***** 学 号： XXXXXX 指导教师： XXXXX 教师职称： XXXXXXX

20XX 年 6 月 1日

摘 要

繁华的大都市，忙碌的生活，人们在这种快节奏的生活中总会变得麻木疲倦，以至于总是会有一些人丢三拉四，忘记自己随手把东西放在哪了或是弄丢了。比如，人们常常会记不清手提包忘在哪里，或者把移动电话弄丢了，甚至是带孩子上街玩，一转眼孩子跑丢了；尤其是在客车，出租车，地铁，步行街等人口密集的场所发生贵重物品被盗或丢失的事件也越来越多，引起了人们越来越多的关注，所以各种电子防遗失产品应运而生，起到预先防止贵重物品被盗或丢失的作用，还可以防止孩子，宠物的丢失。有了它，就可以减少我们丢东西的概率。物体远离报警器由无线发射器电路和无线接收报警器电路两部分组成，采用无线电波的发射抑制原理，工作时发射机发出稳定的无线电波，接收机接收到主机的无线电信号后不报警，当发射机和接收机之间的距离超过预定的距离时接收机接收不到发射机的无线电信号，立即发出报警声，提醒使用者的注意。当无线接收报警器与无线发射器之间的距离超过设定的距离时，无线接收报警器就会发出报警声。该装置可用于箱包、钱包、文件夹等重要物品的防丢失报警，也可防止儿童游玩时走失。

关键词: 报警器 发射器 接收机 无线电波

II

Title The Design of Alarm Device of Object Away From Abstract

In the busy city,the rhythm of people's living is more and more quickly.People always get tired in the life of fast rhythm,and sometimes forget to put the things in a place or lost them.For example,people often can't remember where handbag,or the mobile phone is lost and even when parents take children to the streets,Children are playing run far away,so that parents can't find them.Especially in the bus station, the taxi, the subway, streets populated place,more and more events happen something about the valuables stolen or lost ,and these events cause people more and more attention.So all sorts of things about prevent the loss of the electronic products are produced, and the electronic products can prevent valuables stolen or lost,also can prevent the miss of children and pets. If you have it, we can reduce the probability of lost things.Alarm device of object away from is made from two parts of radio transmitters and wireless receiver,and it uses radio waves to launch the suppression principle.Alarm device work out the transmitter stable radio waves,and receiver receive to the radio signals so it can not alarm. when the distance between transmitter and receiver more than scheduled distance,receiver receive less than the radio signal transmitter,so receiver can warning sound immediately.Thus alarm device can reminds the user's attention and prevent things lost.When wireless receiver and radio transmitters more than the distance between the distance of the set, wireless receiver will alarm sound.This device can be used for bags, wallet, folder, and other important items,because it can prevent things lost , also can prevent the children missing when they are playing.

Keywords Alarm Device Transmitter Receiver Radio Wave

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目 次

摘要 .......................................................................................................................... II ABSTRACT .................................................................................................................... III

1.引言............................................................ 1 2.系统任务基本要求 .................................................................................................................. 1 3.电路的设计原理 ....................................................................................................................... 1 3.1设机构图 .................................................................................................................................. 1 3.2工作原理 .................................................................................................................................. 2 3.3发射电路 .................................................................................................................................. 3 3.4无线接收报警器电路 .......................................................................................................... 3 3.5无线电波通讯 ........................................................................................................................ 4 3.6编解码电路原理与分析 ..................................................................................................... 4 3.6.1编码电路的工作原理 ..................................................................................................... 5 3.6.2解码电路的工作原理 ..................................................................................................... 5 4. 芯片的选择与介绍 .............................................................................................................. 6 4.1 芯片的选择 ............................................................................................................................ 6 4.2 NE555时基电路 .................................................................................................................... 7 4.2.1 555时基电路特点 .......................................................................................................... 7 4.2.2 555时基电路类型 .......................................................................................................... 7 4.2.2.1 TTL的555电路 .......................................................................................................... 8 4.2.2.2 CMOS的电路 ................................................................................................................. 8 4.2.3 555电路的功能介绍 ...................................................................................................... 9 4.2.4 等效电路 .......................................................................................................................... 11 4.3 TDA7000概述 ....................................................................................................................... 11 4.3.1 DC特性 .............................................................................................................................. 12 4.3.2 AC特性 .............................................................................................................................. 12 4.3.3 TDA7000电路 .................................................................................................................. 13 4.4 KD9561电路的介绍 ........................................................................................................... 14 5.使用方法及功能 ..................................................................................................................... 15 6.市场前景及发展方向 ........................................................................................................... 16 结论.................................................................................................................................................. 17 致 谢 .............................................................................................................................................. 19 参 考 文 献 .................................................................................................................................. 20

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1 引言

该物体远离报警器的设计主要由无线发射器电路和无线接收报警器电路两部分组成，当无线接收报警器与无线发射器之间超过一定距离，无线接收报警器就会发出报警声，主要用于防止物品丢失，尤其是防止箱包丢失或防止幼儿走失等问题，可将无线发射器置于箱包中或装在幼儿口袋内，无线接收报警器放在箱包的主人或幼儿的监护人身上;也可用于钱包的防盗报警，可将无线接收报警器安装在钱包内，无线发射器放置在主人身上。一且发生丢失，防盗物品立即发出报警声，便于查找追寻。

2 系统任务基本要求

（1）制作无线发射、装置各一个，其中一个置于钱包或手机（假设为A部分），另一个随身携带（假设为B部分）。正常情况下不报警。当发射接收模块相距大于某范围（3-5米）时，表示钱包或手机已经被人偷走，另一半装置报警，在该范围内则不报警。

（2）报警距离远近可以调节。

（3）A、B部分工作电压不大于5V,工作电流不能超过20mA。 （4）天线长度限制在25cm内。 （5）发射功率不超过20mW。 （6）具有防护、寻找双重保障功能。

（7）不同的发射模块能唯一识别唯一的对应模块，而不受其他模块干扰。

3 电路的设计原理

3.1 设计构图

1