目 录
摘 要................................................................................................................................I
Abstract .............................................................................................................................II
第 1 章 绪论 ...................................................................................................................1
1.1 课题研究的背景 ..............................................................................................1
1.2 国内外研究现状 ..............................................................................................1
1.3 课题研究的意义 ..............................................................................................2
第 2 章 超声波测距原理 ...............................................................................................4
2.1 超声波简介 ......................................................................................................4
2.2 超声波测距原理 ..............................................................................................4
第 3 章 方案论证 ...........................................................................................................6
3.1 设计思路 ..........................................................................................................6
3.2 系统结构设计 ..................................................................................................7
第 4 章 硬件电路设计 ...................................................................................................8
4.1 单片机 AT89S52..............................................................................................8
4.2 超声波测距模块 HY-SRF05.........................................................................10
4.2.1 基本工作原理 .....................................................................................11
4.2.2 HY-SRF05 电气参数..........................................................................11
4.2.3 超声波时序图 .....................................................................................12
4.2.4 超声波应用电路图 .............................................................................12
4.3 温度传感器 DS18B20 ...................................................................................13
4.4 LCD1602 液晶 ...............................................................................................14
4.4.1 LCD1602 主要技术参数 ....................................................................14
4.4.2 LCD1602 引脚功能 ............................................................................14
4.4.3 LCD1602 应用电路图 ........................................................................15
4.5 ISD1420 语音芯片.........................................................................................16
4.5.1 特点 .....................................................................................................16
4.5.2 电特性 .................................................................................................16
4.5.3 ISD1420 引脚功能..............................................................................16
4.5.4 ISD1420 语音电路..............................................................................17
第 5 章 系统软件设计 .................................................................................................19
