4.2.3 湿度检测电路....................................................................................16
4.3 CO
2
检测电路 ................................................................................................17
4.3.1 CO
2
检测概述 .....................................................................................17
4.3.2 MS4100 特征 ......................................................................................17
4.3.3 CO
2
检测电路 .....................................................................................18
4.4 光强检测电路...............................................................................................20
4.4.1 光敏电阻简介....................................................................................20
4.4.2 光敏电阻结构....................................................................................20
4.4.4 光强检测电路....................................................................................23
4.5 A/D 转换电路................................................................................................23
4.5.1 主要特性............................................................................................23
4.5.2 极限参数............................................................................................23
4.5.3 ADC0809 电路组成及转换原理 .......................................................24
4.6 无线数据收发模块.......................................................................................25
4.6.1 SC2262/2272 编解码芯片介绍..........................................................25
4.6.2 SP 多用途无线数据收发模块 ...........................................................31
4.7 OCMJ 中文模块系列液晶显示器说明 ........................................................33
4.7.1 产品简介............................................................................................33
4.7.2 硬件接口............................................................................................34
4.7.3 用户命令............................................................................................35
4.7.4 其他说明............................................................................................38
第五章 蔬菜大棚无线监控系统软件设计................................................................39
5.1 主程序设计...................................................................................................39
5.2 温度检测子程序...........................................................................................39
5.3 A/D 转换子程序............................................................................................40
5.4 无线传输子程序...........................................................................................40
5.5 LCD 显示子程序...........................................................................................41
第六章 总结................................................................................................................42
参考文献......................................................................................................................43
附录 A..........................................................................................................................45
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