基于555定时器的磁控防盗报警电路的设计

基于555定时器的磁控防盗报警电路的设计

目录

摘要 (7)

ABSTRACT (8)

1 绪论 (1)

1.1 本论文的意义与背景 (1)

1.2 防盗报警系统在国内外的发展 (2)

1.3 防盗报警器的发展前景与趋势 (2)

1.4 本论文主要内容 (3)

2 子模块及元器件介绍 (4)

2.1 555定时器 (4)

2.1.1 555定时器简介 (4)

2.1.2 555定时器构成单稳态触发器 (5)

2.1.3 555定时器构成的多谐振荡器 (7)

2.3语音报警器 (11)

2.4 电位器 (11)

2.5 其他电子组件 (11)

3 整体方案设计 (17)

3.1 磁控防盗语音报警器的工作原理 (17)

3.2 报警电路参数计算 (18)

3.3.1 延时与定时 (20)

3.3.2 整形 (22)

4 组装及调试过程 (23)

4.1安装及焊接步骤 (23)

4.2 调试电路板 (24)

4.3 调试报告 (25)

4.4 硬件实现图 (26)

5 结论与展望 (27)

参考文献 (29)

致谢 (30)

摘要

随着经济的快速发展和生活水平的提升，智能化的设备仪器给人们的生活水平带来了很大的便捷。智能安全防范系统形式多样而且性能不一，因此为了给人们的生活提供良好的保障，设计了一种555定时器的报警电路，具备了防盗和报警的功能，实现了信号的自动检测和自动报警。本文介绍了555定时器的报警电路的系统组成及工作原理，探讨了在实际中的具体应用。

555 定时器是一种模拟和数字功能相结合的中规模集成器件。一般用双极性工艺制作的称为 555，用 CMOS 工艺制作的称为 7555，除单定时器外，还有对应的双定时器 556/7556。555 定时器的电源电压范围宽，可在 4.5V~16V 工作，7555 可在 3~18V 工作，输出驱动电流约为 200mA，因而其输出可与 TTL、CMOS 或者模拟电路电平兼容。555定时器可以说是模拟电路与数字电路结合的典范。

本次毕业设计以555 单稳态触发器为核心的磁控语言防盗报警电路，配合磁控开关以及语音报警电路实现报警功能。主要组成为磁控开关触发与单稳态延时电路、报警语音发声电路和语音功放电路。工作原理可概括为当磁控开关的永久磁铁分开时，555 单稳态触发器发出一个高电平信号，向报警语音发声电路提供触发信号和工作电源，由LM386 组成报警语音的功放电路发出报警语音放大，扬声器发出报警。现实生活中实现时，永久磁铁需安装在门窗或被保护的物体上，当门窗打开或保护物体移动时，磁铁分开，此时报警电路会发出警报声提醒主人。

关键词：触发器;磁控开关;功放;报警

ABSTRACT

With the rapid economic development and enhance the standard of living, intelligent equipment and instruments to people's living standards brought great convenience. Intelligent security systems and the performance of different forms, so in order to people's lives provide good protection, designed a 555 timer alarm circuit, with the anti-theft and alarm functions to achieve the automatic detection and automatic alarm signal . This article describes the 555 timer system components and working principle of the alarm circuit, discusses the specific application in practice.

The design 555 single policy to trigger the magnetic control language core burglar alarm circuits with magnetic control as well as the police to voice alarm circuit functions.

555 Timer is a combination of analog and digital functions in scale integration devices. Generally produced using bipolar technology called 555, with CMOS technology is called 7555, in addition to a single timer, there is a corresponding dual timer 556 / 7556.555 wide supply voltage range timer, available in 4.5 V ~ 16V working, 7555 in 3 ~ 18V, the output drive current of about 200mA, so its output can be used with TTL, CMOS, or analog circuit level compatible. 555 timer can be said to combine analog and digital circuit model.

The graduation project with 555 one-shot as the core of magnetron language burglar alarm circuit, with the magnetic switch and voice alarm circuit alarm function. Mainly composed of magnetic switch trigger and monostable delay circuit, the alarm sounding voice circuits and voice amplifier circuit. Works can be summarized as permanent magnet magnetic switch when separated, 555 single-shot issue a high signal to the alarm sounding voice circuit provides trigger signal and the power supply, an alarm from the LM386 amplifier circuit composed voice alarm voice amplified speaker alarm. When implemented in real life, the permanent magnet to be installed on doors or protected objects, when doors open or protective objects move, magnets separated, then the alarm will sound an alarm circuit to remind the owner.

Keywords: trigger, magnetic switches, amplifiers, alarm