毕业设计说明书设计题目：数字式压力流量单片机测控系统——压力部分院（系）专业年级学生姓名学号指导教师职称设计地点日期2012年5月5日数字式压力流量单片机测控系统——压力部分摘要：流体的压力和流量是工业生产过程中的重要参数，通过一个管道流体压力和流量测控系统，能同时检测压力和流量这两种物理量，可以大大提高检测效率和检测的准确性，使仪表的调校和维护也变得简单。利用MCS-51系列单片机设计一个流体压力和流量测控系统，使系统具有压力和流量两个通道的信息输入和处理功能。本文介绍了基于单片机的压力测量通道，它以AT89C51为核心，通过扩散硅压力传感器对压力信号进行采集，再经过运算放大器进行信号放大，送至8位A／D转换器，将模拟信号转换成单片机可以识别的数字信号，送至单片机进行处理，用LED显示数值，最终实现压力的测量。关键词：压力；AT89C51单片机；压力传感器；流体Abstract:Fluidpressureandflowrateareimportantparametersintheindustrialproductionprocess，afluidpressureandflowmeasurementandcontrolsystemcandetectpressureandflowofthesetwophysicalquantities，cangreatlyimprovethedetectionefficiencyandaccuracyofdetection，sothatthetuningoftheinstrumentandmaintenanceeasier．ThedesignisbasedonmeasurementanddisplayofAT89C51single-chip，throughthepressuresensorsconvertingthepressureintoelectricalsignals．Afterusingoperationalamplifier，thesignalisamplified，andtransferredtothe8-bitA/Dconverter．Thentheanalogsignalisconvertedintodigitalsignalswhichcanbeidentifiedbysingle-chipandthenconvertedbysingle-chipintotheinformationwhichcanbedisplayedonLEDmonitor，andeventuallyachievethepressuremeasurement．Keywords:pressure；AT89C51single-chip；pressuresensor；A/Dconverter；fluid目录第一章绪论…………………………………………………………………………………...11.1研究背景...........................................................................................................................................11.2测量压力的意义...............................................................................................................................2第二章硬件设计……………………………………………………………………………...32.1总体设计方案...................................................................................................................................32.2压力传感器.......................................................................................................................................42.3信号放大电路...................................................................................................................................72.4A/D转换器.......................................................................................................................................92.5AT89C51单片机.........................................................................................................................一三2.6键盘设计.........................................................................................................................................142.7显示器.........................................................................................................................................一五第三章软件设计…………………………………………………………………………….一八3.1软件主程序.................................................................................................................................一八3.2A/D转换器的程序设计.......................................................
