目录
摘要 ...........................................................I
Abstract ..................................................................................................II
目录 ........................................................................................................III
1 绪论.......................................................................................................1
2 系统总设计.............................................................................................2
2.1 设计内容与要求 .............................................................................2
2.2 系统设计的总体思路 ......................................................................2
3 方案论证与比较......................................................................................4
4 系统硬件结构 .........................................................................................5
4.1 整体硬件设计思路..........................................................................5
4.2 单片机电路 AT89S52 .......................................................................5
4.2.1 主要性能参数 .........................................................................5
4.2.2 管脚说明................................................................................6
4.2.3 单片机最小系统......................................................................8
4.3 温度传感电路..................................................................................9
4.3.1 DS18B20 介绍.........................................................................9
4.3.2 DS18B20 工作电路 ................................................................10
4.4 烟雾传感电路................................................................................10
4.4.1 烟雾传感器 MQ-2..................................................................10
4.4.2 MQ-2 传感器的特性及主要技术指标 .......................................11
4.4.3 ADC0832 介绍 ......................................................................12
