目 录
摘 要...........................................................................................................I
前 言..........................................................................................................1
第 1 章 系统设计要求....................................................................................2
1.1 系统总体设计要求...................................................................................................................................2
1.2 系统功能概述...........................................................................................................................................2
1.3 系统设计思路...........................................................................................................................................2
第 2 章 系统的设计方案论证..........................................................................4
2.1 硬件总体设计方案...................................................................................................................................4
2.2 主控芯片的选择.......................................................................................................................................4
2.3 超声波的发射与接收电路比较论证.......................................................................................................4
2.3.1 发射部分方案................................................................................5
2.3.2 接收部分方案................................................................................5
2.4 温度补偿的方案与论证...........................................................................................................................6
2.5 显示模块选择比较...................................................................................................................................6
2.6 语音芯片选择...........................................................................................................................................7
2.6.1 语音芯片的特点............................................................................7
2.6.2 语音芯片的电特性.........................................................................7
2.6.3 独立按键工作模式.........................................................................8
第 3 章 系统硬件电路设计.............................................................................9
3.1 主控电路框图与原理图...........................................................................................................................9
3.1.1 系统设计框图................................................................................9
3.1.2 主电路原理图................................................................................9
3.2 DS18B20 温度补偿电路........................................................................................................................10
3.3 ISD1730 语音报警..................................................................................................................................11
3.4 发送超声波模块电路图.........................................................................................................................11
3.5 接收超声波模块电路图.........................................................................................................................13
第 4 章 系统软件设计..................................................................................14
4.1 总体设计框图.........................................................................................................................................14
4.2 子程序设计框图.....................................................................................................................................15
第 5 章 系统的测试和误差分析.....................................................................16
5.1 系统硬件调试.........................................................................................................................................16
5.2 系统软件调试.........................................................................................................................................16
5.3 系统整体测试.........................................................................................................................................16
5.4 系统测试仪器.........................................................................................................................................17
5.5 系统测量与误差分析.............................................................................................................................17
5.5.1 数据测量与分析..........................................................................17
5.5.2 误差分析....................................................................................19
结 论........................................................................................................19