基于SHT1x温湿度采集单元的硬件设计.doc

南阳理工学院本科生毕业设计（论文） 基于SHT1X的温湿度采集单元硬件设计 The Hardware Design of the Temperature and Humidity Collecting Unit Based on SHT1X 总 计： 18 页 表 格： 0 个 插 图 ： 10 幅 基于SHT1X温湿度采集单元的硬件设计 [摘 要]本课题是基于SHT1X温湿度采集单元的硬件设计部分，整个系统由基于单片机的数据集中显示和控制主机和基于单片机的温湿度数据采集节点从机两部分构成，主机和从机之间通过RS485总线构成的总线拓扑结构，实现温湿度数据分布式采集和集中显示。 本系统的设计主要是数据显示和单片机控制的主机模块和基于单片机的温湿度采集节点两部分的硬件电路设计。主机模块设计包括数码显示电路的硬件设计和用于存储采集信息的看门狗电路设计，以及提供5V电压的电源电路设计；从机的设计主要是采用SHT1X系列温湿度传感器的温湿度采集节点的硬件电路设计，以及看门狗电路和地址电路的设计；最后就是连接主从机的RS485总线通信电路设计。主要用到的芯片有AT89C51、X5045、MAX485等。 [关键词]单片机；温湿度传感器；485总线技术；通信协议 The Hardware Design of the Temperature and Humidity Data Processing and Display Unit Based on SHT1X Abstract：This topic is based on the hardware design of humidity and temperature acquisition unit SHT1X, the entire system is based on single-chip host. It displays and controls temperature and humidity , and achieves the distributed collection of temperature and humidity and centralized data show. Master and slave through the RS485 bus constitute a topology. The design of the system is mainly single-chip control of data display and the host module and the temperature and humidity based on single-chip nodes collect two-part design of hardware circuits. Host design includes a digital display circuit design and hardware used to store the collected information is stored watchdog circuit design, and to provide 5V power supply voltage circuit design; from the machine is designed for use mainly SHT1X series of temperature and humidity sensors collecting temperature and humidity node hardware circuit design, as well as the watchdog circuit and circuit selector switch design; the last is the main connection of the RS485 slave bus communication circuit design. The chips are mainly used AT89C51、X5045、MAX485、etc. Keywords： Single-chip microcomputer; temperature and humidity sensors; 485 bus technology; communication protocol 目 录 1 引言 1 1.1 课题的提出和意义 1 1.2 国内外研究现状 1 1.3主要研究内容 2 1.4 系统总体设计 2 1.4.1 系统功能设计 2 1.4.2 系统设计原则 3 1.