【2017年整理】数字式温度计的设计..docVIP

数字式温度计的设计 摘要 随着现代信息技术的飞速发展和传统工业改造的逐步实现，能够独立工作的温度检测与显示系统应用于诸多领域。传统的温度检测以热敏电阻为温度敏感原件。热敏电阻的成本低，需要外加信号处理电路，而且可靠性相对较差，测温准确度低，监测系统也有一定的误差。与传统的温度计相比，这次设计的是基于DS18B20的数字温度计。它具有读数方便，测温范围广，测温精确，数字显示，适用范围宽等特点。 在本设计中选用AT89C系列单片机为核心器件，采用DS18B20数字传感器为测温元件，通过3位LED数码管显示并进行传送数据，实现温度显示。本设计的内容主要分为两部分，一是对系统硬件部分的设计，包括温度采集电路和显示电路；二是对系统软件部分的设计，对温度的采集与实现进行编程，通过DS18B20直接读取被测温度值，送入单片机进行数据处理，之后进行输出显示，最终完成了数字温度计的总体设计。其系统构成简单，信号采集效果好，数据处理速度快，便于实际检测使用。 关键词：单片机AT89C2051；温度传感器DS18B20；LED数码管；数字温度计 Digital Thermometer Design Summary With the rapid development of modern information technology and traditional industrial transformation gradually realize, able to work independently temperature detection and display system applied to many fields. The traditional temperature testing to thermistors for temperature sensitive parts. Fortement low cost, require additional signal processing circuits are relatively poor, and reliability, low temperature measurement accuracy, monitoring system also has the certain error. Compared with the traditional thermometer, this design is based on digital thermometer. The chip DS18B20 It has readings convenient, measuring temperature range, temperature measurement precision, the digital display characteristics, wide application scope. In this design chooses AT89C2051 series microcontroller as the core component, using DS18B20 digital sensors for temperature measuring element, through three LED digital pipe display and transmit data, realize temperature display. The main content of this design can be divided into two parts, one is the design of system hardware parts, including the temperature acquisition circuit and display circuit; 2 it is the design of system software part of the collection of temperature, and implement programming, through DS18B20 directly read temperature being measured data processing, into SCM, output shown after, eventually completed the overall design of digital thermometer. The system structure is simple, signal acquisition effect is good, d