[学士论文]毕业设计（论文）-基于单片机的双向防盗器设计.doc

双向防盗器设计 【摘要】随着人们生活水平的提高，汽车已逐步进入家庭，对汽车防盗的要求越来越高Abstract】With the improvement of people’s living standard, private cars have gradually stepped into more and more common families, and as a result, people have been more and more concerned with effective vehicle guarding-against-theft systems; and at the same time, with the continuous development of wireless technology, this kind of systems have become much more flexible, convenient, reliable and safer. This article introduces a design of a bi-directional vehicle guarding-against-theft system, which is based upon MCU LPC930 and radio transmission and reception module TDA5255, and the design is made up of two main parts: the remote controller and the mainframe. The communication between the remote controller and the mainframe is by means of half-duplex data transmission, and the states of the mainframe controlled by the controller include setting up and release from defense, seeking cars, opening the back door of cars and it also can give an alarm simultaneous with the mainframe; and the mainframe can detect couples of triggered sources, give an alarm and inform the controller simultaneously, and also, it can carry out corresponding actions set by the controller; besides, it can automatically lock and unlock, revert to the original state, central-controlling lock and release from defense when in emergency. The system has a PWM-coding based self-defining communication protocol, and it uses FSK modulation and demodulation. The programming is based on programming language C with Keil as the compiler environment. 【Keywords】 LPC930、TDA5255、PWM、FSK Modulate and Demodulate 目 录 第1章 引言 6 第2章 防盗器系统要求 8 2.1 防盗器主机指标要求 8 2.1.1 主机基本要求 8 2.1.2 主机扩展功能要求 10 2.2 遥控器指标要求 10 2.2.1 遥控器基本要求 10 第3章 系统方案选择 13 3.1 核心控件—MCU 13 3.2 无线通信模块 14 3.3 通信协议 14 3.3.1 PWM编码格式 15 3.3.2 字节的发送格式 17 3.3.3 数据帧格式 17 3.3.4 帧的发送接收时间计算 19 第4章 无线通信模块设计 20 4.1 TDA5255芯片介绍 20 4.1.1 总体描述 20 4.1.2 功能模块介绍 21 4.1.3 FSK调制 23 4.1.4 FSK解调 23 4.1.5 节电控制 25 4.1.6 信号检测和低电压检测 2