With the development of technology and people's life level, the mankind's need to vehicle become more and more. the request to the intelligence of vehicle are also more and more high, so the intelligence turn will be the topic and direction of car development aftertime. This article mainly study the intelligence small car that can automatically avoid roadblock. Collecting signal of roadblock are based on infrared-ray sending and receiving, and the signal will be changed into digital signals(DS) that can be known by the SCM. The SCM can control the small car forward, turning and falling back, also the SCM have to deal with the real time data in the process, for example, the time and distance of the car moving, the sound and light prompt.
Key words: AT89S52 SCM、speed control、roadblock detect、automatically avoid roadblock、state display.
目 录
摘要（本论文范文的论文综述） I
Abstract II
绪 论 1
1 系统设计总思想 4
2 速度控制设计 5
2.1 电机驱动方案选择 5
2.2 驱动电路设计 7
2.3 PWM控制 9
3 避障功能设计 11
3.1 避障方案选择 11
3.2 避障电路设计 11
4 小车行驶状态监控 13
4.1 脉冲信号的获得 13
4.1.1 霍尔传感器 13
4.1.2 光电传感器 13
4.1.3 光电编码器 14
4.2 硬件连接 14
5 显示系统设计 16
6 供电方案的选择 18
7 单片机系统设计 20
7.1 控制核心CPU的选择 20
7.1.1 单片机简介 20
7.1.2 MCS-51系列单片机 20
7.2 AT89S52单片机 21
7.2.1 引脚说明 22
7.2.2 AT89S52系统设计 23
8 软件设计 25
8.1 避障子程序 26
8.2 脉冲探测信号输出子程序 29
8.3 串行口输出显示子程序 30
8.4 发光二极管、扬声器驱动信号 31
9 电路板制作与调试 32
10 结 论 35
致 谢 36
参考文献 37
附录1 主要元器件表 38
附录2 系统电路图 39
附录3 芯片下载程序 40
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