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flow

電流采樣方法

Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the tech-niques to do so are as diverse as the applications them-selves.

標簽： 電流采樣

上傳時間： 2013-10-15

上傳用戶：daoyue
電流檢測電路手冊

　　Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the tech-niques to do so are as diverse as the applications them-selves. This Application Note compiles solutions to cur-rent sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents

標簽： 電流檢測電路

上傳時間： 2013-10-22

上傳用戶：moshushi0009
工控軟件組態王與單片機多機串口通訊的設計

詳細介紹工控軟件組態王與單片機多機串口通訊的設計原理。分析組態王提供的直接與單片機串口通信方法的優點，給出系統基于RS-485總線傳輸的接口電路原理圖。根據組態王提供的通訊協議和單片機多機串口通訊的原理，給出程序設計流程與思路。 Abstract: In this paper，the design principle of communication between multi-SCM and KingView by serial ports is described in detail.We analysis the advantage of method supplied by KingView,by which KingView can communicate with serial ports of SCM directly，and provide the system’s interface circuit based on the RS-485transmission line.We provide flow diagram of programming and thinking on the basis of communication protocol supplied by KingView and principle of communication among multi-SCM through serial ports.

標簽： 工控軟件單片機串口通訊多機

上傳時間： 2013-12-19

上傳用戶：tecman
串行時鐘PCF8583在微機保護裝置中的應用

實時時鐘是微機保護裝置的重要部件，在討論PCF8583結構與功能的基礎上，提出采用dsPIC33F系列微處理器與串行I2C時鐘PCF8583的接口設計方案，給出了相應的接口電路與軟件流程。該設計方案結構簡單，可靠性高，開發周期短，具有一定的實用與參考價值。所設計的微機保護裝置已投入現場運行，效果良好。 Abstract: Real-time clock chip is an important part in microcomputer protection device.Based on discussing the structure and function of PCF8583，a new interface scheme which uses dsPIC33F microprocessor and serial clock chip（I2C）PCF8583is proposed.The method of the circuit design and the main software flow are introduced in this paper.The scheme has simple structure，higher reliability and shorter exploitation cycle，so has definite practicality or reference value.The microcomputer protection device has been put into operation with better effects.

標簽： 8583 PCF 串行時鐘中的應用

上傳時間： 2013-11-18

上傳用戶：Thuan
基于單片機和基站器件EM4095的手持式低頻RFID讀卡器

介紹一種采用單片機技術和基站器件EM4095的手持式低頻RFID讀卡器方案。首先對整個系統框架進行說明，然后介紹主要功能模塊的設計，給出了各模塊的原理圖。重點描述了基站器件EM4095的性能參數和功能原理，最后描述了該系統的主程序流程圖。 Abstract: In this paper,a handheld RFID reader based on MCU and EM4095 is introduced.At first，the configuration of this system is explained.Then the design of main modules and schematic documents are particularly presented.The parameters and principle of the chip EM4095 are introduced in detail. At last，the main software flow is given

標簽： 4095 RFID EM 單片機

上傳時間： 2013-10-18

上傳用戶：windypsm
基于AT89S52的漢字顯示屏的設計

介紹了一種基于AT89S52微處理器、鍵控顯示模式、多漢字顯示的顯示模塊設計方法。對AT89S52的內部功能及使用高128字節RAM時的尋址方式進行說明。給出了四漢字顯示模塊的硬件電路原理圖、主程序流程圖以及中斷顯示流程圖。 Abstract: The design method of display module base on the AT89S52 microcontroller,display mode controlled by keyboard and? showing several Chinese characterses are introduced in the paper.The internal function and the addressing mode for the high 128B RAM of the AT89S52 are explained.The basic circuit diagram,the main program flow chart and the display interrupt flow chart of four Chinese characterses display module are also given.

標簽： 89S S52 AT 89

上傳時間： 2014-01-23

上傳用戶：咔樂塢
LS7266R1在電子式萬能材料試驗機中的應用

針對材料試驗機等設備中要求測量或控制材料拉伸或壓縮的位移，一般采用光電軸角編碼器檢測位置信號，輸出正交編碼脈沖信號。若采用其他方法檢測位置信號，必然導致電路設計復雜，可靠性降低。因此，提出一種基于LS7266R1的電子式萬能材料試驗機設計方案。給出了試驗機中的控制器工作原理，LS7266R1與單片機的接口硬件設計，以及主程序軟件流程圖。巧妙地把力量傳感器，位移傳感器等機械運動狀態的壓力或拉力以及位置坐標，變成了電壓信號和電脈沖數字信號，供A/D測量和LS7266R1計數，從而實現了獨立完成材料試驗控制或通過PC機串口命令完成材料試驗控制。 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.

標簽： 7266R 7266 LS R1

上傳時間： 2013-11-02

上傳用戶：yl1140vista
基于MSP430F149的智能電池巡檢系統的設計

介紹了電力操作電源與智能電池巡檢系統的特點，給出了一種基于超低功耗單片機MSP430 F149針對中小型變電站自動化運行的專用設備的基本設計原理及實現方法，最后給出了詳細硬件構成和軟件實現。該系統能滿足中小型變電站安全、可靠、自動運行的要求，并通過與上位機的串行通信實現變電站的遠程管理和控制。 Abstract: The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the special equipment which only designed for the middle or small transformer substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small transformer substation’s satisfy, reliably,and automatic running.And it can also realize the transformer substation long-distance management and control by serial communicating with the host computer.

標簽： 430F F149 MSP 430

上傳時間： 2013-11-25

上傳用戶：黃華強
基于IC卡的新型供暖計費系統設計

將現行的供暖計費方式由按建筑面積計費變為按消耗的熱能計費是供暖計費方式發展趨勢，為了滿足這一計費方式變化的需要，設計了基于IC卡的預付費式新型供暖計費系統，通過測量用戶采暖系統進出口的溫度和流量，計算用戶消耗的熱能，利用IC卡記錄用戶預付費的金額和當年熱能的單價，根據熱能消耗和當年熱能的單價計算用戶采暖費，根據實際發生的供暖費用和預付費金額控制供暖的開停，這一計費方式的變化使供暖計費更趨合理。 Abstract: It is trend that the mode of heat charging is changed from billing by building area to by thermal energy. In order to meet the needs of heat charging mode changing， a new system of heat charging based on IC card is proposed. The user?蒺s energy consumption is calculated by measuring the user inlet and outlet temperature and flow，using the IC card to record the prepaid amount and the current price of heat. The user?蒺s heating costs is calculated according to energy consumption and current price， according to actual heating costs and prepaid amount，the system controls the heating opening or stopping. It is more reasonable that calculated heating costs by user heat consumption

標簽： IC卡計費系統設計

上傳時間： 2013-10-14

上傳用戶：大融融rr
LPC1700以太網MIIM接口應用筆記

The LPC1700 Ethernet block contains a full featured 10 Mbps or 100 Mbps Ethernet MAC (Media Access Controller) designed to provide optimized performance through the use of DMA hardware acceleration. Features include a generous suite of control registers, half or full duplex operation, flow control, control frames, hardware acceleration for transmit retry, receive packet filtering and wake-up on LAN activity. Automatic frame transmission and reception with Scatter-Gather DMA off-loads many operations from the CPU.

標簽： 1700 MIIM LPC 以太網

上傳時間： 2013-11-09

上傳用戶：geshaowei