为提高电容测量精度，针对电容式传感器的工作原理设计了基于PIC16LF874单片机电容测量模块。简单阐述了电容测量电路的应用背景和国内外研究现状，介绍了美国Microchip公司PIC16LF874单片机的特性。电容式传感器输出的动态微弱电容信号通过PS021型电容数字转换器把模拟量数据转换成数字量数据，所测数据由PIC16LF874单片机应用程序进行处理、显示和保存。实验结果表明，固定电容标称值为10~20 pF 的测量值相对误差在1%以内，同时也可知被测电容容值越大，测量值和标称值相对误差越小。 Abstract: To improve the accuracy of capacitance measurement，aimed at the principle of work of mercury capacitance acceleration transducer，the design of micro capacitance measurement circuit is based on the key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers，focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors （capacitancedigital converter） to convert analog data into digital data，the measured data from the PIC16LF874 microcontroller application process， display and preservation. Experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%，but also it canbe seen the value of the measured capacitance larger，measuring value and the nominal value of relative error smaller.
上传时间： 2013-10-29
上传用户：wojiaohs
设计一种基于P89V51RD2的功率因数测量仪，采用光电隔离器和专用数码管驱动器。该测量仪是以增强型单片机P89V51RD2为核心，大大简化系统硬件设计。而软件部分采用模块化设计思想，采用中值滤波和小数补偿算法，实现功率因数的高精度测量。实验测试表明，该功率因数测量仪测量精度高，运行稳定可靠。 Abstract: A power－factor measurement instrument based on P89V51RD2is designed，which uses optical coupler and specific LED drive chip.The power factor measurement instrument uses P89V51RD2as a core of which greatly simplifies the system design.Furthermore，modularization software is developed in detail.The high precision power－factor measuring system is realized by the center value filter and fractional compensation algorithm.Experiments manifests that the power－ factor measurement instrument is high precision，steady and reliable.
上传时间： 2014-12-27
上传用户：CHINA526
介绍了一种基于C8051F020单片机的多路压力测量仪。该测量仪选用电阻应变式压力传感器采集压力信号，并经放大电路处理后送入C8051F020单片机，再由C8051F020单片机内部的A/D转换器将采集到的压力信号进行模数转化，然后分别对数据进行存储和显示。该测量仪能测量6路压力信号，并且各测量点都能单独检测和设置。由于采用了C8051F020单片机，简化了硬件电路，增强了抗干扰能力，使得测量仪具有测量精度高，冲击小等特点。 Abstract: A measurement apparatus for multi-channel pressure based on single chip microcomputer is introduced.It can measure 6 channels signal of the pressure，and the pressure measure points can be detection and located individually.The pressure signal sampling is obtained by resistor stress-type pressure sensors，the digital signals of 6 channels are collected through amplifying and adjustment circuit of pressure signals and internal integrated A/D converter of MCU.Finally，and it realizes the function to store and display data separately.C8051F020 was used to made hardware circuit simple，and it also enhanced the anti-interference ability.It features high precision and little impact.
上传时间： 2013-11-16
上传用户：yare
针对目前采用的热敏电阻测量方法，提出了采用单总线数字式温度传感器DS18B20和单片机组成的新型温度测量仪。介绍DS18B20的结构和工作原理，以及单总线工作原理，给出了由Mega8单片机和DS18B20构成的单总线温度测量仪的硬件电路及软件流程图。经试验基于单总线器件DS18B20的温度测量仪，具有测量准确、测温范围宽、体积小、控制方便等优点。 Abstract: This paper brings forward a new temperature meter composed of 1-Wire temperature sensor DS18B20 and MCU which has advantage of the thermistor. In the article, the DS18B20＇s structure and controlling principles are introduced and hardware circuit and software diagram of the temperature meter are given.After been tested,the temperature meter has the advantages of accurate measurement, wide temperature range, small volume and convenient controlling.
上传时间： 2013-10-31
上传用户：hzy5825468
介绍一种以MSP430单片机为基础的智能频率测量系统，采用硬件逻辑与软件指令相结合的方式控制闸门，实现0 MHz~10 MHz范围内无档切换的等精度测量。 Abstract: An intelligent frequency measurement system based on MSP430 singlechip is introduced. The system uses a way that can combine hardware logic and software instructions to contronl the strobe ,and completes the functions of equal precision in the range of 0MHz~10MHz without shifting
上传时间： 2013-10-28
上传用户：dbs012280
本文对激光扫描车身坐标测量系统的数据采集部分进行了深入研究，设计了基于“AVR+FIFO+CPLD”的数据采集及处理模块；解决了当多路信号有数据同时传输时，如何将数据完整地写入FIFO的问题，实现了数据的有效采集；编写了完整的CPLD控制程序和AVR数据采集程序，为准确测量待测点的坐标提供了可靠的数据来源。
上传时间： 2013-10-29
上传用户：asaqq
介绍了应用51单片机开发设计光栅尺位移测量系统的电路思路及软件设计方法。应用光栅位移传感器和辨向电路的设计原理，开发设计了一套在线测量位移装置，该装置测量精度可达到+-0.1MM，实现了在机床加工过程中实时检测工件尺寸
上传时间： 2013-11-23
上传用户：wushengwu
摘要：介绍一种采用单片机控制的小功率DC/AC逆变电源，直流升压控制部分采用电流型控制芯片UC3846，该控制方案能显著地抑制推挽变压器的磁偏，同时提高负载的动态响应速度。
上传时间： 2013-10-08
上传用户：sun_pro12580
摘要：应用复杂可编程逻辑器件CPLD和微控制器MPU技术，设计了符合俄罗斯OCT18977-79 和PTM1495-75航空数据总线标准的多通道串行双极性数字发送电路。该电路结构简单、使用灵活、可靠性高，可广泛应用于俄制机载设备的检测及仿真试验。关键词：复杂可编程逻辑器；航空数据总线；ARINC429
上传时间： 2013-10-11
上传用户：风行天下
摘要：设计了后面两轮驱动，前轮采用万向轮的三轮AGV。在简要介绍其结构和考虑非完整约束基础上．使用矩阵方法分析了AGV转弯问题，得出柔顺运动模式下的状态空间和控制方程。同时，搭建了PC机为上位机，MC~51单片机为下位机的CA总线无线通讯系统。优化参数下的路径跟踪仿真和实验证明了滑模变结构控制器和无线通讯系统的有效性。关键词：非完整约束；自动导航车；CAN现场总线；滑模变结构控制
上传时间： 2013-11-02
上传用户：youmo81
