基于单片机和PC串口通信温度采集系统设计.doc

基于单片机和 PC 串口通信的温度采集系统设计  中文摘要  基于单片机和 PC 串口通信的温度采集系统设计 中文摘要 温度是一种最基本的环境参数，日常生活和工农业生产中经常要检测温度。随着 半导体技术的飞速发展，各种数字化、智能化温度测量技术的应用范围越来越广，因 此掌握温度测控系统的硬件组成及系统软件设计尤为重要。 传统的温度采集方式是采用热电偶或热电阻，由于其输出为模拟信号，必须经过 A/D 转换环节获得数字信号后才能与单片机等微处理器连接，使得硬件电路结构比较 复杂，制作成本较高。近年来，以美国 DALLAS 公司生产的 DS18B20 为代表的新型单 总线数字式温度传感器得到广泛的应用。本项目设计了一单片机/PC 控制的测温/传 输系统。前台由 DS18B20 传感器将温度直接转变成数字信号送入单片机中进行实时采 集，通过 LCD1602 液晶显示模块将结果在前台显示出来；另外，采集结果又通过 RS-232 接口送入 PC 机后台中以便进行显示、存储或后续处理。 关键词：AT89S52；LCD1602；RS-232；数字温度传感器  作  者：周建春  指导教师：钱 敏  II  I Abstract  Design of A Temperature Acquisition System Based on Simple Chip Machine RS232 of PC  Design of A Temperature Acquisition System Based on Single Chip Machine RS232 of PC Abstract Temperature is one of the most basic environmental parameters, and it usually must be measured in daily life and industrial agricultural production. With the rapid development of semiconductor technology, more and more, digital intelligent temperature measuring technology is widely applied. So it is particularly important to master the techonlogy of designing a temperature measurement control system in hardware and software. The traditional mode of Temperature measurement adopted thermocouple or thermistor whose output is analog signals and must be converted to digital signals, then transmitted into SCM(Simple Chip Machine). So it is rather complex with little higher cost. In recent years, DS18B20(DALLAS USA), as a representative of the new digital temperature sensor with single bus, is widely used. In this project, a temperature measuring transmition system controlled by SCM and PC is designed. At front end, the real-time temperature data acquired and converted to digital type through DS18B20 sensor are sent into SCM, and it is displayed on LCD1602 module. In addition, the acquired temperature data are transmitted to back end PC via RS - 232 interface so as to be displayed , storied and continued process.  Key words：  AT89S52；LCD1602；RS-232；Digital Temperature Sensor