目 录
摘 要 .........................................................................................................................................Ⅰ
Abstract ......................................................................................................................................Ⅱ
引 言 .......................................................................................................................1
第一章 方案论证及选择 .........................................................................................2
1.1 微处理器选择 ..................................................................................................................2
1.2 测距传感器选择 ...............................................................................................................2
1.3 语音报警器的选择 ...........................................................................................................3
1.4 显示子系统的设计 ...........................................................................................................3
第二章 超声波测距雷达工作原理 .........................................................................4
2.1 超声波传感器介绍 ...........................................................................................................4
2.1.1 超声波传感器的特性 ....................................................................................................6
2.2 超声波测距的原理及实现 ..............................................................................................7
第三章 硬件设计 .....................................................................................................9
3.1 系统总体结构框图 ...........................................................................................................9
3.2 AT89C51 单片机 ..............................................................................................................9
3.3 电源电路 ........................................................................................................................12
3.4 时钟电路 ........................................................................................................................13
3.5 复位电路 ........................................................................................................................13
3.6 超声波测距模块 HC-SR04 ...........................................................................................14
3.7 74HC573 芯片.................................................................................................................16
3.8 数码管显示及报警电路设计 ........................................................................................17
第四章 系统软件设计............................................................................................20
4.1 系统主程序的设计 .........................................................................................................20
4.2 中断处理程序的设计 .....................................................................................................22
4.3 测距模块的设计 .............................................................................................................22
