基于 AT89C52 单片机超声波测距仪的设计BASED ON AT89C51 ULTRASONIC RANGEFINDER DESIGN学生姓名学院名称专业名称指导老师 目录摘要 ···········································11绪论 ············································3 1.1课题讨论的背景 ··································3 1.2课题提出及讨论的意义····························4 1.2.1课题的提出 ···································4 1.2.2课题的讨论意义 ·······························42超声波的介绍和超声波的测距原理··················4 2.1超声波的介绍 ····································4 2.1.1什么是超声波········································4 2.1.1超声波的特性及特点··································4 2.1.3超声波的应用········································5 2.2超声波测距的原理及误差分析······················5 2.2.1超声波的测距原理····································5 2.2.2超声波的误差分析····································6 2.3单片机实现测距原理····································73系统硬件设计 ····································7 3.1系统结构设计 ····································7 3.2单片机AT89C52最小系统··························8 3.2.1单片机的功能········································8 3.2.2主要性能参数········································9 3.2.3 AT89C52的管脚说明··············...
