对于传统的跑步机无法联机组网,保存历史数据,实时调试等问题,介绍了一个由多台跑步机通过RS-232串行总线与上位机相连组成的跑步机联网系统。系统采用W77E58作为下位机核心控制器件,它具有双串行通讯端口,其中一个串口用于与变频器通讯,另一个串口则与上位机相连,构成跑步机网络。 Abstract: The traditional running machine can not be connected to a network, saving historical data, real time debug etc.In this paper,a new network system which is composed of running machines connected by a RS-232 communication bus is introduced.In the system,W77E58 is used as a core control unit.W77E58 has two serial ports,one is connected to the inverter and the other is connected to the PC. Thus a network appears.
上传时间: 2014-12-27
上传用户:哇哇哇哇哇
为了解决磁放大器性能测试过程中,需要对其供给不同数值恒定电流的问题,设计了一种基于DAC7512和单片机的数控恒流源系统。该系统采用AT89C51作为主控器件,将计算机发送的电流控制字命令转换为D/A转换器控制字,通过模拟SPI通信接口,写D/A控制字到DAC7512,从而控制其输出相应数字电压值,经差动缩放电路、电压/电路变换电路和功率驱动电路,最后输出恒定电流。实验结果表明,恒流源输出电流调节范围为-45~+45 mA、精度为±0.1 mA,分辨率达0.024 4 mA,具有应用灵活,外围电路简单,可靠性高的特点。该数控直流恒流源也可为相关产品的测试系统研发提供参考。 Abstract: In order to solve the need to supply different values constant current for the magnetic amplifier in testing process, numerical control constant current source system was designed based on DAC7512 chip and microcontroller technology. The system used the AT89C51 as the main chip, which can convert the current control word from computer into to D/A control words. And the system wrote D/A control word into the DAC7512 chip to control the output voltage value by the SPI communication interface, which can output corresponding constant current figures by scaling circuit, the V/I converter and power drive circuit. Experimental results show that the current source output current adjustment range is -45~+45mA, accuracy is ± 0.1mA, and resolution ratio is 0.024 4mA
上传时间: 2014-12-27
上传用户:invtnewer
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
WTS701是华邦公司推出的内建喇叭驱动功能的“文字转发音”单芯片集成电路。该芯片将连续运算法与华邦专有的多层次储存技术相结合,从而实现了真正将“文字转发音”的完整功能。文中介绍了该芯片的原理及典型应用,给出了Cygnal F120 MPU与WTS701 的接口电路,并根据相应的芯片指令给出了其控制软件的代码程序。 Abstract: WTS701 is really a single chip on “text-to-speech” produced by Winbond company building-in algorithm with the company's patented multi-level storageMLS technology熏 different from other chips that “text-to-speech” on the market at present. The principle and typical application of this chip are introduced in this article the interface circuit of Cygnal F120 MPU and WTS701 is presented. The corresponding? control software is provided.
上传时间: 2013-10-08
上传用户:旗鱼旗鱼
针对当前安检力学试验机所能完成的试验种类单一、自动化程度低等问题,提出一种以ATmega128单片机为核心控制器的安检力学试验机的设计。详细阐述了该安检力学试验机各个组成部分的设计原理和方案,并且给出了各部分的软件设计思想和操作流程。经过大量测试试验表明:设计的安检力学试验机可以完成多达十余种的力学安检试验,完全符合相关国家标准,并且具有数据采集精度高、传输速度快、操作安全简便等特点,实现了安检设备的多功能化、数字化和自动化。 Abstract: Currently, many mechanical security testing machines have only one function. The degree of automation of them is low. To solve those problems, a new kind of mechanical security testing machine, using ATmega128 micro-controller as its core controller, has been advanced. It describes the components of the machine. The principles and the scheme in the designing processes are presented in detail, and the software architecture and the operation processes of each part are given. After having done many testing, we have reached the following conclusions: the mechanical security testing machine presented can do over ten mechanical security tests complying with related national standards. It has high data acquisition accuracy and high transmission speed. The operation of the machine is simple and safe. In general, this machine is a multi-functional, highly automatic, digitalized security testing device.
上传时间: 2013-11-05
上传用户:a67818601
概述MCS-51单片机引入国内高等教学已达10年之久,随着半导体技术的迅猛发展,经典的MCS-51单片机已不能适应当前的教学需要。全球领先的C8051F单片机覆盖了嵌入式系统的主要技术内容,且与51单片机相兼容,是MCS-51单片机的升级换代产品。且目前发展势头强劲,其必将成为单片机教学的新方向。SILABS公司MCU产品中国区代理--新华龙电子有限公司适时的设计、开发了贴近当前高校教学的C8051F单片机教学实验机(NCD-CIP51F020-B)。
上传时间: 2013-11-07
上传用户:lvzhr
摘要:介绍了采取专用电平转换芯片MAX232实现PC机与MCS51单片机之间的串行通信的方法.通过对系统的通信方式选择89C51通信波特率的设置、通信的设置,以及对接口电路的软件和硬件的设计分析,展示了该电路的实用性.关键词:微处理器;PC机;串行通信;RS-232接口;MAX232芯片
上传时间: 2014-01-22
上传用户:shizhanincc
摘要:提出一种全新的利用键盘接口实现单片机系统和PC机通信的方案,介绍了键盘与PC机通信的原理,并成功地应用于实际系统。该方案为外部单片机系统与3-机通信提供了一条有效的途径。关键词:键盘接口 单片机系统 时序 命令字
上传时间: 2013-11-03
上传用户:drink!
摘要:以AT89S52单片机和单总线数字温度传感器DS18B20及步进电机为主要器件制作测控电路。上位机以温度为主要参数,通过串口控制步进电机的正转、反转和加速、减速。C51程序实现对传感器的数据采集和与上位机的串行通信,LabVIEW实现测温波形动态显示、数据存储、越限报警和电机控制。经实际运行,系统能够较好地控制步进电机,可用于需要及时检测温度并进行步进电机控制的场合。关键词:单片机;LabVIEW;DS18B20;步进电机
上传时间: 2013-11-23
上传用户:671145514
TM2101测控系统简介 本测控系统专为拉力机、压力机、电子万能材料试验机而研制。适用于测定各种材料在拉伸、压缩、弯曲、剪切、撕裂、剥离、穿刺等状态下的力学性能及有关物理参数。可做拉伸、压缩、三点抗弯、四点抗弯、剪切、撕裂、剥离、成品鞋穿刺、纸箱持压、泡棉循环压缩、弹簧拉压及各种动静态循环测试。
上传时间: 2013-10-10
上传用户:liangrb