目录摘要........................................................................................................................................1Abstract...................................................................................................................................2第一章选题背景..................................................................................................................31.1课题背景.................................................................................................................31.2设计重点和难点.....................................................................................................3第二章方案论证与比较......................................................................................................42.1温度传感器的选择.................................................................................................42.2湿度传感器的选择.................................................................................................4第三章总体设计..................................................................................................................63.1系统设计.................................................................................................................63.2芯片AT89C51介绍................................................................................................63.3传感器的介绍.........................................................................................................93.3.1传感器的定义与作用......................................................................................93.3.2传感器特性.....................................................................................................103.3.3温度传感器DS18B20....................................................................................103.3.4湿度传感器GHS-20E....................................................................................153.3.5A/D转换TLC549..........................................................................................153.4温湿度采集电路