摘要本论文实现了基于超声波倒车安全系统的设计，利用超声波来测量距离障碍物的距离，并给出相应的提示，达到倒车安全的目的。系统以STC90C516RD+单片机为核心，使用HC-SR04超声波集成模块获取后方障碍物的距离。另外，系统配备一个1602的液晶显示器，实现后方距离及当前安全状态的指示。当后方障碍物小于极限值时，由蜂鸣器实现的报警装置开始发声，以提醒驾驶者。36468
论文阐述了超声波测距的基本原理，LCD1602液晶显示的原理，以及蜂鸣器报警原理。并系统的整合上述模块为一个系统。对组成系统的各个模块进行了详细的描述。软件设计方面，最后进行了软件架构的详细描述。
经过测试，系统安装方便，便于再拆卸和安装，并且正常工作，达到设计要求。
毕业论文关键词：汽车倒车；单片机；超声波；蜂鸣器报警液晶指示
The design and application of ultrasonic ranging system
Abstract:This paper realizes the design of the safety system based on ultrasonic, and uses ultrasonic to measure the distance of distance obstacle, and gives the corresponding tips to achieve the purpose of reversing the safety of the car The system takes the STC90C516RD+ micro-controller as the core, uses the HC-SR04 ultrasonic integrated module to obtain the rear obstacle distance. In addition, the system is equipped with a 1602 LCD, to achieve the rear distance and the current security status of the instructions. When the rear obstacle is less than the limit, the alarm device realized by the buzzer starts to sound, to remind the driver.
The basic principle of ultrasonic ranging, the principle of LCD1602 liquid crystal display, and the principle of buzzer alarm are described in this paper And the system of the integration of the above module for a system. The modules of the system are described in detail In the software design, the software architecture is described in detail
After testing, the system is easy to install, easy to remove and install, and work normally, to meet the design requirements.
Key words: auto reverse; SCM; ultrasonic; buzzer alarm; LCD instruction
stc90c516RD
目录 - 5 -
1 绪论 - 1 -
1.1 课题背景 - 1 -
1.2 倒车检测技术的发展 - 1-
1.3 本课题的研究思路 - 1 -
1.4 论文主要工作 - 2 -
2 超声波倒车安全系统方案设计 - 3-
2.1 总体设计原则 -3 -
2.2 系统总框图 - 3 -
2.3 各模块方案选择 - 4 -
2.3.1 电源电路的选择 - 4-
2.3.2 单片机的选择 - 5 -
2.3.3 障碍物检测电路的选择 - 6 -
2.3.4 显示电路的选择 - 6 -
2.3.5 报警电路的选择 -6-
2.4 主要模块设计原理 - 7 -
2.4.1 单片机选择 - 7 -
2.4.2 超声波模块HC-SR04测距原理 - 10 -
2.4.3 蜂鸣器报警原理 - 12 -
2.4.4 LCD1602液晶显示原理 - 13 -
3 超声波倒车系统硬件设计 - 17 -
3.1 电源电路 - 17 -
3.2 单片机最小系统 - 18 -
3.3 超声波测距电路 - 21 -
3.4 显示电路 - 21-
3.5 报警电路 - 23 -
3.6 系统整体硬件电路图 - 24 -
4 超声波倒车系统软件设计 - 24 -
4.1 系统主程序流程图 - 24 -
4.2 超声波测距 - 25 -
4.3 报警功能流程 - 27 -
4.4 系统管理任务流程 -29 - STC90C516RD+单片机超声波测距系统的设计+电路图+程序:http://www.youerw.com/zidonghua/lunwen_34941.html