针对材料试验机等设备中要求测量或控制材料拉伸或压缩的位移,一般采用光电轴角编码器检测位置信号,输出正交编码脉冲信号。若采用其他方法检测位置信号,必然导致电路设计复杂,可靠性降低。因此,提出一种基于LS7266R1的电子式万能材料试验机设计方案。给出了试验机中的控制器工作原理,LS7266R1与单片机的接口硬件设计,以及主程序软件流程图。巧妙地把力量传感器,位移传感器等机械运动状态的压力或拉力以及位置坐标,变成了电压信号和电脉冲数字信号,供A/D测量和LS7266R1计数,从而实现了独立完成材料试验控制或通过PC机串口命令完成材料试验控制。 Abstract: Aiming at the requirement that the displacement of the tension and compression always be tested and controlled in the equipement such as material testing machine. The position signal was tested by photoelectric axial angle coder. Therefore, the paper proposes the design of electronic universal testing machine design based on LS7266R1. If the position signal detected by other methods, will inevitably lead to the circuit design complexity, reliability decreased. The work theory of the controller, the hardware interface design between LS7266R1 and single chip, and the flow chart of main program, are presented in this paper. The signal of the compression or tension power and displacement at working, which tested by power sensor and displacement sensor especially, is changed into electric voltage and electric pulse numerical signals. And these signals can be tested by A/D and counted by LS7266R1. Finally the test of the material properties can be controlled by itself, or controlled by the COM command of PC.
上传时间: 2013-11-02
上传用户:yl1140vista
介绍了CAN总线和P87C591单片机的特点,给出了基于P87C591单片机的信号采集节点的软、硬件设计,指出了硬件电路设计中应注意的问题,在软件设计中重点介绍了节点初始化、报文发送和报文接收等子程序。 Abstract: The features of CAN Bus and the microcontroller P87C591 are introduced, and the design of hardware circuit and soft configuration of the signals collection node based on P87C591 are presented. The problems in designing hardware circuit are discussed.Initialization subprogram, transmiting subprogram and receiving subprogram are emphasized in soft configuration.
上传时间: 2013-11-03
上传用户:BIBI
为解决输油管道温度压力参数实时监测的问题,设计了以C8051F930单片机作为控制核心的超低功耗输油管道温度压力远程监测系统。现场仪表使用高精度电桥采集数据,通过433 MHz短距离无线通信网络与远程终端RTU进行通信,RTU通过GPRS网络与PC上位机进行远程数据传输,在上位机中实现数据存储和图形化界面显示,从而实现输油管道温度压力参数的实时监测和异常报警。经实验证明,该系统的12位数据采集精度满足设计要求,漏码率小于1%,正常工作时间超过5个月,能实时有效地监测输油管道的温度压力参数,节省大量人工成本,有效预防管道参数异常造成的经济损失和环境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters, the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection, the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU, the GPRS was used by the RTU to transmit data to the PC host computer, and the data was stored and displayed in the PC host computer, so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time, it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
上传时间: 2013-11-07
上传用户:cuibaigao
系统是基于AT89S52单片机的数字式低频信号发生器。采用AT89S52 单片机作为控制核心,外围采用数字/模拟转换电路(DAC0832)、稳压电路(MC1403)、运放电路(LM324)、按键和LED显示灯电路等。通过按键控制可产生方波、锯齿波、三角波、正弦波等,同时用LED显示灯指示对应的波形。其设计简单、性能优良,可用于多种需要低频信号源的场所,具有一定的实用性。
上传时间: 2013-11-06
上传用户:fhjdliu
!方波信号是数字电路中非常重要的信号源!其产生方法有很多途径"本设计是基于MPLAB平台通过对方波信号发生器的电路分析!介绍了方波信号的产生原理和软件实现过程!并利用’:.单片机的定时器#计数器技术对PIC16F877A进行编程$通过对TMRO模块进行设置!使其分频比改变!产生V种不同频率的方波信号!同时改变初始值!产生任意频率的方波信号"
上传时间: 2013-10-23
上传用户:c12228
摘要:根据红光和红外光透过手指后光吸收量变化的特点.本文研究了基于单片机AT89C52的血流信号采集系统。该文设计了血流信号检测电路,研究了四点累加平均滤波和五点滑动平均滤波算法,有效的滤除了信号的高频噪声.克服了因个人生理差异引起的信号基线漂移、易饱和等问题。通过VB编程,实现了单片机和PC机之间的串行通信。关键词:单片机;血流信号;信号采集;串行通信
上传时间: 2013-11-04
上传用户:xmsmh
【摘要】本文设计了以PC机为上位机、AT89C51单片机为下位机,并辅之以传感器、变频器以及相关接口部件的二级集散压力控制系统。着重介绍了基于TLC2543单片机的数据采集与处理系统。总结了基于单片机的过程控制系统的优势。关键词:过程控制,单片机,数据采集
上传时间: 2013-11-22
上传用户:BOBOniu
本文介绍了直接数字合成(DDS)技术以及C8051F020微控制器,阐明了采用AD9859实现扫频信号发生器的原理,具体描述了C8051F020微控制器与AD9859之间的硬件接口电路以及相应的软件设计方法,设计了一个5阶低通椭圆滤波器,使输出的正弦波更加稳定、平滑。本设计能够产生良好的扫频信号,并且C8051F020和AD9859的优越性能大大提高了扫频速度,是一种良好的数字化设计。
上传时间: 2013-11-07
上传用户:asdstation
以STC12C2052AD单片机芯片为控制核心,采用PID控制技术,设计了一套针对半导体封装设备超声波金丝球焊线机的焊接压力控制系统。使其具备了高精度、多参数设置、高灵敏度、用户界面友好以及系统成本低等特点。
上传时间: 2014-01-10
上传用户:tianyi996
在工业控制和智能化仪表中,常由单片机进行实时控制及实时数据处理。单片机所加工的信息都是数字量,而被控制或测量对象的有关参量往往是连续变化的模拟量,如温度、速度、压力等等,与此对应的电信号是模拟电信号。单片机要处理这种信号,首先必须将模拟量转换成数字量,这一转换过程就是模—数转换,实现模/数转换的设备称为 A/D 转换器或ADC。 AD 转换器是单片机应用中常见的接口,从事单片机开发的人员通常都会遇到使用 AD的要求,本文通过一个典型的例子来学习一种常用 AD转换器的用法。
上传时间: 2013-10-18
上传用户:yueguizhilin