自动化084刘晓晨详解.docVIP

基于CAN-USB技术的粮仓温湿度监测系统设计 摘 要 本文介绍了目前国内外粮仓储粮发展背景、国内外研究现状，并设计了以516RD+单片机控制为核心和以CAN总线为通信的粮仓温湿度监控系统的硬件及软件设计。这是一种基于CAN-USB技术的粮仓温湿度监测系统，该系统主要由两大模块构成：现场数据采集模块和CAN-USB转换接口模块。现场数据的采集是以516RD+单片机为核心控制单元，外接温度传感器DS18B20和湿度传感器HS1101，通过CAN总线控制器SJAl000将数据发送到CAN总线；CAN-USB转换接口模块是以CH372芯片为控制单元，外接USB通信芯片及SJAl000控制器，实现CAN-USB接口转换。整个系统的终端设备为监控PC机，用户软件采用VC++语言编写，可以实现现场状态监控和中断接收数据管理等功能，同时具有实时显示的功能。该系统具有精度高，速度快，稳定性好等特点，也可应用于其它相关的温度和湿度控制系统，通用性较强。 关键词：CAN总线；单片机CH372；CAN-USB接口转换 Design of the granary of the temperature and humidity monitoring system Based on CAN-USB technology Abstract This paper introduces the development background of granary storage at home and abroad, research status from domestic and abroad, and designed to 516 RD + single-chip microcomputer control as the core and the CAN bus for communication with the granary of the temperature and humidity control system of hardware and design of software. This is a kind of based on CAN-USB technology the granary of the temperature and humidity monitoring system, this system mainly by two big blocks: the data acquisition module and CAN-USB conversion interface module. Field data collection is based on 516 RD + single-chip microcomputer is the control unit, external temperature sensor DS18B20 and humidity sensor HS1101, through the CAN bus controller will be sent to SJAl000 data CAN bus, CAN-USB conversion interface module CH372 chip in for the control unit, an external USB communications chip and SJAl000 controller, realize CAN-USB interface conversion. The entire system of terminal equipment for monitoring the PC and user software using the VC++ language, can realize the condition monitoring and interrupt receiving data management, and other functions, and has the function of the real-time display. The system has high accuracy, speed, good stability and other characteristics, which can be applied to other related the temperature and humidity control system, is used widely. Keywords：CAN bus; Single chip microcomputer; CH372; CAN-USB i