数字温度计的设计制作设计.docVIP

数字温度计的设计制作 学校： 班级： 姓名： 学号： 职称： 指导教师： 2012年04月 摘 要 随着时代的进步和发展，已经普及到我们生活，工作，科研，各个领域，已经成为一种比较成熟的技术,本文将介绍一种基于单片机控制的数字温度计，本温度计属于多功能温度计，可以设置上下报警温度，当温度不在设置范围内时，可以报警。温度是工业中非常关键的一项物理量，在农业、工业、各种高新技术的开发和研究中也是一个非常普遍和常用的测量参数。目前，随着信息技术的发展，传感技术的广泛应用，温度测试技术已向自动化、智能化方向发展。基于此，提出了温度的数字化测量。? 随着人们生活水平的不断提高，数字温度计的要求也越来越高，为现代人工作、科研、生活、提供更好、更方便的设施就需要从新技术入手，一切向着数字化控制、智能化控制方向发展。? 本设计需要采用传感器技术与电子技术相结合。设计的数字温度计与传统的温度计相比，输出温度采用数字显示，具有读数方便，测温范围广，测温准确等重要特点。主要用于测温比较准确的场所。要求在万能板上焊接的电路布局合理、连接简洁；要求主板和万能板间连接合理、牢固、美观。本文介绍了数字温度传感器内部结构及工作时序，并提出了数字温度计设计方案．该数字温度计的测温范围为-50~+110，精度误差在0.1以内，具有测温精度高，控制性能良好等特点，该温度计完全适用于一般的应用场合，也可在高低温报警，远距离多点测温控制等方面进行应用． Abstract This article mainly discusses the design process of using single-chip AT89C52 to measure frequency, cycle, time interval and duty cycle. Using the algorithm of measuring N signal cycle, making full use of the three programmable timer / counter of single-chip AT89C52, combined with some digital circuits, the frequency meter overcomes the shortcomings of the measurement accuracy reduces with the reduction of the frequency of the measured signal by the frequency meter based on the principle of traditional measurement of frequency , achieves high-precision measurements of the frequency, cycle, time difference and duty cycle, displays the results. The hardware system circuits of the digital frequency meter is made up of the pre-shaping circuit, sub-frequency circuit, reference signal source, single-chip circuit, digital display circuit and DC power supply regulator circuit. Of it, the single-chip circuit consists of single-chip, data selector, keyboards and status indication circuit. The software system is made up of main program, keyboard subroutine, display subroutine, NT and N measurement subroutine, pulse high and low level width measurement subroutine, prepared by the assembly language. Through the cooperation with each other of the hardware system and software s