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1、汽车倒车防撞报警器设计摘要 设计了一种汽车倒车防撞系统。该系统以 AT89C2051 单片机为控制核心，工作时，超声波传感器采集的数据，由控制核心快速计算出汽车车尾与障碍物的距离，并通过 LED 显示提醒信息，该系统主要利用单片机的实时控制和数据处理功能，完成系统的控制。最后阐述了报警器的硬件电路原理及软件设计。一般由超声波传感器（俗称探头） 、控制器和显示器等部分组成，在控制器的控制下，由装置于车尾保险杠上的探头发送超声波，遇到障碍物，产生回波信号，传感器接收到回波信号后经控制器进行数据处理，判断出障碍物的位置，由显示器显示距离并发出警示信号，得到及时警示，使倒车变得更轻松。本方案采用语音提
2、示的方式，本文介绍了以 SPCE061A 单片机为核心的一种低成本、高精度、微型化，并有数字显示和声光报警功能的倒车雷达系统。利用SPCE061A 单片机所具备的单芯片语音功能，外接三个超声波测距模组，组成一个示例的倒车雷达系统，语音提示报警（0.35m1.5m）范围内的障碍物。关键词AT89C2051 超声波 传感器Car to car crash alarm designAbstract Design a car reversing anti-collision system. With AT89C2051 single chip processor as the core, for th
3、e system to work, teach according to the ultrasonic sensors, the control core to quickly calculate the vehicle to the rear of the distance and obstacles, and through the LED display to remind information, this system mainly using single chip microcomputer real-time control and data processing functi
4、ons, complete control of the system. Finally expounds the hardware circuit principle and software design of the alarm. Generally by the ultrasonic sensor (commonly known as probe), controller and display parts, under the control of the controller, the device on the rear bumper send ultrasonic probe,
5、 encountered obstacles, produce echo signal, the sensor receives the echo signal from the controller for data processing, determine the position of the obstacles, the display shows distance and issued a warning signal, get timely warning, made back more easily. This scheme adopts the voice prompt, t
6、his paper introduces the SPCE061A as the core of a low cost, high precision, miniaturization, and has the function of digital display and sound and light alarm, reversing radar system. Using the SPCE061A single chip has voice function, external three ultrasonic ranging module, to form a sample rever
7、sing radar system, voice alarm (0.35 m 1.5 m) within the scope of the obstacles. Keyword AT89C2051 ultrasonic sensor目 录 引 言.1第一章 方案选择与分析.2 1.1 实现功能.2 1.2 系统总体方案介绍.3 第二章 系统硬件设计.4 2.1 SPCE061 芯片特性.4 2.1.1 SPCE061 简介.4 2.1.2 芯片特性.5 2.2 电源模块.5 2.3 放音模块.6 2.4 超声波测距模组.7 2.4.1 超声波谐振频率发生电路，调理电路.7 2.4.2 超声波回波接受处理电路.8 2.4.3 超声波测距模组电源接口.8 2.4.4 超声波测距模式选择跳线.9 2.5 转接板.9 2.5.1 转接板电路.9 2.5.2 显示电路.10 第三章 系统软件设计.11 3.1 软件结构.11 3.2 超声波测距原理.11 3.3 各模块程序说明.13 3.3.1 超声波测距程序.13 3.3.2 语音播放程序.16 3.3.3 显示刷新程序.
