目 录
1 绪论 ....................................................................................................................................1
1.1 远程温度监测系统产生的背景和意义 ..................................................................1
1.2 监测智能化发展及前景 ..........................................................................................2
1.3 总体要求和规划 ......................................................................................................3
1.3.1 总体方案设计 ...............................................................................................3
1.3.2 方案分析 .......................................................................................................4
2 GSM 网络基础知识和 SMS 通信原理 .............................................................................5
2.1 GSM 模块技术概况及其特点 ................................................................................5
2.2 短消息业务 SMS 的概述 ........................................................................................5
2.2.1 SMS 的通信指令 TA 指令...........................................................................6
2.3 TC35I 通信模块.......................................................................................................8
3 系统硬件电路的设计 ......................................................................................................10
3.1 系统总体硬件结构设计 ........................................................................................10
3.2 AT89S52 及其外围电路 .......................................................................................11
3.2.1 电源电路 ....................................................................................................14
3.2.2 温度传感器 DS18B20 ................................................................................15
3.2.3 按键电路 .....................................................................................................16
3.2.4 液晶显示电路 .............................................................................................17
3.3 TC35I 外围电路设计.............................................................................................18
3.3.1 采用 MAX232 接口的串行通信................................................................20
4 软件设计 ..........................................................................................................................21
4.1 系统总软件的设计流程 ........................................................................................21
4.2 短消息的软件设计 ................................................................................................21
4.3 测试结果 ................................................................................................................23
结 论 ..............................................................................................................................25
参考文献 ..............................................................................................................................26
致 谢 ..............................................................................................................................28
附录 1：整体电路图 ...........................................................................................................29
附录 2：源程序 ...................................................................................................................31
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