《毕业设计：基于51单片机的远程温度采集与显示系统设计》.doc

摘 要 随着数字技术的发展和计算机日益广泛的应用，单片机技术在各个领域得到了充分的应用。本设计以AT89C51单片机为设计开发平台，结合DS18B20温度传感器、LCD液晶显示、LED数码管、RS-485远程通信、按键和报警几部分电路，构成了远程温度采集与显示系统。远程通信采用RS-485串行通讯的标准，通过DS18B20进行现场总线的温度采集，然后将温度数据送入单片机进行数据处理，具有巡检速度快，扩展性好，成本低的特点。 本设计中的温度采集系统充分发挥了AT89C51单片机的特点，结合现有技术，大大降低了电路的设计复杂度，该系统具有温控准确、操控界面良好、稳定性高、抗干扰能力强等优点。使用RS-485总线，一对双绞线就能实现多站联网，构成分布式系统，设备简单、价格低廉、能进行长距离通信的优点使其得到了广泛的应用。本系统能够同时检测4路温度，检测温度的范围为-55℃~+125℃。本设计采用AT89C51八位单片机实现，单片机软件编程的自由度大，可通过编程实现各种各样的算术算法和逻辑控制，而且体积小，硬件实现较简单，安装方便。 基于单片机的温度采集系统广泛应用于采用计算机、自动测试、微电子和自动控制等多项技术，不仅具有信号采集方便、简单和灵活性大等优点，而且可以大幅度提高被测温度的技术指标。 关键词：RS-485总线；单片机；温度测量系统 Abstract With the development of digital technology and the increasingly widespread application of computer, microcontroller technology in various fields have been fully applied. The design use AT89C51 microcontroller as development platform,combined with DS18B20 temperature sensor, LCD liquid crystal display, LED digital tube, RS-485 remote communications, alarm buttons, and several parts of the circuit, constitutes a remote temperature measurement and display system. Remote Communication with RS-485 serial communication standard, through the field bus DS18B20 temperature acquisition,then the temperature data into the microcontroller for data processing, with the inspection speed, scalability and low cost characteristics. The design of the temperature acquisition system fully plays the characteristics of the AT89C51 microcontroller, combined with existing technology, greatly reduces the circuit complexity, the system has accurate temperature control, good control interface, high stability, strong anti-interference advantages . Using the RS-485 bus, a pair of twisted pair can achieve multi-station network, the distributed system, simple equipment, low cost, can communicate over long distances to get the advantages of a wide range of applications. The 4-way system can detect temperature, test temperature range is -55 ℃ ~ +125 ℃. This design uses eight AT89C51 MCU, MCU software programming large d