虫虫首页| 资源下载| 资源专辑| 精品软件
登录| 注册

Key-Value

  • FreeModbus 英文资料

    If register should be written or read.This value is passed to the calback functions which support either reading or writing register values. Writing means that the application registers should be updated and reading means that the modbus protocol stack needs to know the current register values.See also: eMBRegHoldingCB(), eMBRegCoilsCB(), eMBRegDiscreteCB() and eMBReglnputCB().Enumeration values: MB_REG_READ Read register values and pass to protocol stack.MB_REG_WRITE Update register values.Note: Note all ports implement this function.A port which wants to get an callback must define the macro MB_PORT_HAS_CLOSE to 1.Returns: If the resources where released it return eMBErrorCode:: MB_ENOERR. If the protocol stack is not in the disabled state it returns eMBErrorCode:: MB_EILLSTATE.Examples: LINUX/demo.c, MCF5235TCP/demo.c, STR71XTCP/demo.c, WIN32/demo. cpp, and WIN32TCP/demo. cpp.his function disables processing of Modbus frames.Returns: If the protocol stack has been disabled

    标签: FreeModbus

    上传时间: 2022-05-31

    上传用户:

  • openmv AD工程,三版成功

    个人定制版openmv,使用官方原版openmv4硬件文件修改而来,三次打样(修改两次)后实现全部功能,使用国内常用元件,保证都是淘宝容易买到的,并且简化一部分电路设计,去掉BTB接口,直接单板实现,使用FPC镜头,焊接个FPC座就行,免得焊BGA的感光元件,现在只有STM32H743VIT6+OV7725(FPC小镜头),一体化设计,兼容原版尺寸接口,去掉不必要的SWD接口,OV7725独立供电,大部分功能已验证过(包括摄像头、TF卡、串口、SPI屏幕、当然肯定有USB连接上位机),在电赛时也使用过,好几个月了没出过问题。没有key,即“盗版 openmv”,除每次弹窗外不影响使用,固件使用DFU刷入,SWD是没有用的,所以去掉了。 给出原理图、PCB、PCB工程文件、集成封装库等硬件全部文件,Altium Designer 16格式(AD16)。 (使用原版openmv二次修改而来,已包含原版openmv的license文件:master/openmv LICENSE.txt)

    标签: openmv ad

    上传时间: 2022-06-11

    上传用户:

  • 基于滑模观测器与分数阶锁相环的无传感器PMSM矢量控制

    Abstract: A sliding mode observer and fractional-order phase-locked loop (FO-PLL) method is proposed for the sensorless speed control of a permanent magnet synchronous motor (PMSM).The saturation function is adopted in order to reduce the chattering phenomenon caused by the sliding mode observer. In this proposed FO-PLL, method, a regulable fractional order r is involved, which means that the FO-PLL provides an extra degree of freedom. In fact, the conventional phase-locked loop (PLL) applied in sensorless PMSM control can be seen as a special case of the proposed FO-PLL. By selecting a proper fractional order r a better performance may be achieved. The computer simulation results demonstrate the effectiveness of the proposed method.Key words: fractional calculus; fractional order phase-locked loop; sensorless control; sliding mode observer; permanent magnet synchronous motor; speed controll

    标签: 滑模观测器 传感器 pmsm 矢量控制

    上传时间: 2022-06-18

    上传用户:

  • IGBT图解

    le flows through MOS channel while Ih flows across PNP transistor Ih= a/(1-a) le, IE-le+lh=1/(1-a)' le Since IGBT has a long base PNP, a is mainly determined by ar si0 2ar= 1/cosh(1/La), La: ambipolar diff length a-0.5 (typical value)p MOSFET channel current (saturation), le=U"Cox"W(2"Lch)"(Vc-Vth)le Thus, saturated collector current Ic, sat=1/(1-a)"le=-1/(1-a)"UCox"W/(2Lch)"(Vo-Vth)2Also, transconductance gm, gm= 1/(1-a)"u' Cox W/Lch*(Vo-Vth)Turn-On1. Inversion layer is formed when Vge>Vth2. Apply positive collector bias, +Vce3. Electrons flow from N+ emitter to N-drift layer providing the base current for the PNP transistor4. Since J1 is forward blased, hole carriers are injected from the collector (acts as an emitter).5. Injected hole carriers exceed the doping level of N-drift region (conductivity modulation). Turn-Off1. Remove gate bias (discharge gate)2. Cut off electron current (base current, le, of pnp transistor)

    标签: igbt

    上传时间: 2022-06-20

    上传用户:wangshoupeng199

  • 单片机实现ADPCM编码和解码

    INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified Adaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.adaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.

    标签: 单片机 adpcm 编码 解码

    上传时间: 2022-06-20

    上传用户:

  • 分立元件IGBT驱动电路的改进与测试

    摘要:本文在分析1GBT的动态开关特性和过流状态下的电气特性的基础上,通过对常规的IGBT推挽驱动电路进行改进,得到了具有良好过流保护特性的IGBT驱动电路。该电路简单,可靠,易用,配合DSP等控制芯片能达到很好的驱动效果Abstract:Based on the studies on the dynamic switching and over-current characteristics of IGBT,this paper makes some improvments to the original push-pull driving circuit,obtains a new IGBT driving circuit which has a good over-current protection function.The circuit is simple,reliable and easy to use.Combined with controlling chips such as DSP it will do a great job in driving applications.关键词:IBGT:开关特性;驱动;过流保护;Key Words:IGBT;switching characteristics;driving:over-current protection

    标签: 分立元件 igbt 驱动电路

    上传时间: 2022-06-21

    上传用户:

  • ServoOne安装调试手册

    Note: Before commissioning the value of the connected mains voltage must be set in the servo controller(factory setting=3×400 V AC). More detailed information see chapter 4"Commissioning".通讯接口所有的Servo-One系列均有USB及TCP/IP通讯接口,可通过LT-I公司的Drive-Manager5软件进行通讯,进行相关参数的读写和现场调试,详情请参考章节.…软件调试。Servo-One Junior:X9(USB1.1)TCP/IP(开发中)Servo-One:X2(USB1.1)X3(TCP/IP)Note: The faults can be acknowledged in accordance with their programmed reaction(ER) or reset via a 24 V-reset(X9/10)(ER.).Attention: Faults marked with a dot can only be reset, after the cause of the fault has been eliminated.显示为当前版本V5.4.0同时,相应的USB接口驱动也在对应的安装文件夹内,例:C:\Program FileLTI DRiVES GmbHILTi DriveManager 5.4.0drivers

    标签: servoone

    上传时间: 2022-06-24

    上传用户:

  • Zigbee远程控制LED灯组网程序

    Android 手机远程Zigbee网络控制实验V1.01、实验准备材料1.Android手机一部(要求系统版本在1.6以上,并有wifi支持)2.Win7系统的笔记本电脑一台,并有wifi以及USB接口支持。3.软件server.apk USR-TCP-Test.apk TcpComm.exe2、实验步骤1.安装server.apk USR-TCP-Test.apk到Android手机,安装完成效果如下图所示:2.在复制TcpComm.exe到计算机,完成后效果如下图所以:3.在电脑上建立wifi接入点开始输入CMD复制:netsh wlan set hostednetwork mode=allow ssid=ABCDEFG key=123456789到DOS命令窗口

    标签: zigbee 远程控制 led

    上传时间: 2022-06-24

    上传用户:

  • 利用Filter Solutions辅助设计滤波器.

    【摘要】介绍一种滤波器辅助设计软件Filter Solutions,利用其设计一款常用的带通滤波器,并将仿真曲线与实测结果进行比较。【关键词】Filter Solutions;滤波器;辅助设计Use Filter Solutions aid filter design Abstract:Introduce a software-Filter Solutions,which aid to design filter.Use it to digign a common band pass filter,then compare the result ofreslstemeasweothe simuetur,I1.Com Key words:Filter Solutions;filter;aid design1引言广义上的滤波器深入到我们生活中的每一个角落,人眼对图像的反应符合低通滤波器的特征,人耳对声音的反应则符合带通滤波器的特征。随着近年来电子工业的飞速发展,滤波器已成为电子技术应用中不可缺少的基础器件之一,尤其广泛地应用于通信领域。能快捷而准确地设计出预期特性的滤波器已成为所有电子工程师越来越强烈的需要。

    标签: 滤波器 辅助设计

    上传时间: 2022-06-25

    上传用户:

  • Arduino编程参考手册中文版

    程序结构在Arduino中,标准的程序入口main函数在内部被定义,用户只需要关心以下两个函数:setup)当Arduino板起动时setup()函数会被调用。用它来初始化变量,引脚模式,开始使用某个库,等等。该函数在Arduino板的每次上电和复位时只运行一次。1oop0在创建setup函数,该函数初始化和设置初始值,1oop(O函数所做事的正如其名,连续循环,允许你的程序改变状态和响应事件。可以用它来实时控制arduino板。示例:控制语句if if,用于与比较运算符结合使用,测试是否已达到某些条件,例如一个输入数据在某个范围之外。使用格式如下:该程序测试value是否大于50。如果是,程序将执行特定的动作。换句话说,如果圆括号中的语句为真,大括号中的语句就会执行。如果不是,程序将跳过这段代码。大括号可以被省略,如果这么做,下一行(以分号结尾)将成为唯一的条件语句。

    标签: arduino

    上传时间: 2022-07-01

    上传用户: