<button id="o6e0y"></button> ·詳細說明：使用TI的TMS320VC5402 DSP實現(xiàn)。DTMF的撥號采用實驗儀的鍵盤輸入，解碼后在液晶屏上顯示- Uses TI TMS320VC5402 DSP to realize. The DTMF digit dialing uses tests the meter the keyboard entry, after the decoding demonstrated on the l
上傳時間： 2013-07-25
上傳用戶：哇哇哇哇哇
Submission must be made within 10 days after the printhead upgrade.Failure to do so will void the 12-month warranty by TallyGenicom.
上傳時間： 2013-11-22
上傳用戶：DXM35
設(shè)計了水聲信號發(fā)生系統(tǒng)中的功率放大電路，可將前級電路產(chǎn)生的方波信號轉(zhuǎn)換為正弦信號，同時進行濾波、功率放大，使其滿足換能器對輸入信號的要求。該電路以單片機AT89C52，集成6階巴特沃思低通濾波芯片MF6以及大功率運算放大器LM12為核心，通過標準RS232接口與PC進行通信，實現(xiàn)信號增益的程控調(diào)節(jié)，對干擾信號具有良好的抑制作用。經(jīng)調(diào)試該電路工作穩(wěn)定正常，輸出波形無失真，在輸出功率以及放大增益、波紋系數(shù)等方面均滿足設(shè)計要求。 This paper presented a design and implementation of underwater acoustic power amplifer. This circuit converted the rectangle signal generated by frontend circuit into the sine signal， then filtered and power amplification， it meets the requirements of the transducer.Included AT89C52， 6th order Butterworth filter MF6， hipower amplififier LM12.Communication with PC through the RS232 port. The signal gain is adjustable and could be remote controlled. It has a good inhibitory effect on the interference signal. after debugged， this circuit works stable， the output waveform has no distortion， it meets the design requirement in outprt power， amplifier gain and ripple factor.
上傳時間： 2013-11-20
上傳用戶：qwe1234
Abstract: Some types of loads require more current during startup than when running. Other loads can be limited to a lower-powercurrent during startup but require a higher operating current. This article describes an application circuit that automatically adjusts apower circuit’s overcurrent protection level up or down after startup is complete.
標簽： FET 保護 集成 電源開關(guān)
上傳時間： 2013-10-23
上傳用戶：swaylong
為了改變目前電網(wǎng)現(xiàn)場作業(yè)管理的變電巡檢、變電檢修試驗、輸電線路巡檢檢修等管理系統(tǒng)各自獨立運行，信息不能共享，功能、效率受限，建設(shè)和維護成本高的現(xiàn)狀，提出了采用B/S+C/S構(gòu)架模式，將各現(xiàn)場作業(yè)管理模塊和生產(chǎn)MIS（管理系統(tǒng)）集成為一體的現(xiàn)場作業(yè)管理系統(tǒng)的設(shè)計方案，做到各子系統(tǒng)和生產(chǎn)MIS軟硬資源共享，做到同一數(shù)據(jù)唯一入口、一處錄入多處使用。各子系統(tǒng)設(shè)備人員等基礎(chǔ)信息來源于生產(chǎn)管理系統(tǒng)，各子系統(tǒng)又是生產(chǎn)管理系統(tǒng)的作業(yè)數(shù)據(jù)、缺陷信息的重要來源。經(jīng)過研究試用成功和推廣應(yīng)用，目前該系統(tǒng)已在江西電網(wǎng)220 kV及以上變電站全面應(yīng)用。 Abstract: In order to improve the status that the substation field inspection system， substation equipments maintenance and testing system， power-line inspection and maintenance system are running independent with each other. They can?蒺t share the resource information which accordingly constrains their functions and efficiency， and their construction and maintenance costs are high. This paper introduces a field standardized work management system based on B/S+C/S mode， integrating all field work management systems based on MIS and share the equipments and employee?蒺s data of MIS，the field work data of the sub systems are the source information of MIS， by which the same single data resouce with one-time input can be utilized in multiple places. after the research and testing， this system is triumphantly using in all 220kV and above substations in Jiangxi grid.
標簽： 電網(wǎng) 信息化 管理系統(tǒng)
上傳時間： 2013-11-15
上傳用戶：han_zh
以C8051F020為核心處理器，設(shè)計無線傳感器網(wǎng)絡(luò)數(shù)據(jù)采集系統(tǒng)。系統(tǒng)采用SZ05-ADV型無線通訊模塊組建Zigbee無線網(wǎng)絡(luò)，結(jié)合嵌入式系統(tǒng)的軟硬件技術(shù)，完成終端節(jié)點的8路傳感器信號的數(shù)據(jù)采集。現(xiàn)場8路信號通過前端處理后，分別送入C8051F020的12位A/D轉(zhuǎn)換器進行轉(zhuǎn)換。經(jīng)過精確處理、存儲后的現(xiàn)場數(shù)據(jù)，通過Zigbee無線網(wǎng)絡(luò)傳送到上位機，系統(tǒng)可達到汽車試驗中無線測試的目的。 Abstract: This paper designs a wireless sensor network system for data acquisition with C8051F020 as core processors.The system used SZ05-ADV wireless communication module，set up a Zigbee wireless network， combined with hardware and software technologies of embedded systems，completed the end-node 8-locale sensor signal data acquisition.Eight locale signals were sent separately into the 12-bit ADC of C8051F020 for conversion through front treatment.after accurate processing and storage，the locale data was transmitted to the host computer through Zigbee wireless.The system achieves the purpose of wireless testing in vehicle trial.
標簽： C8051F020 Zigbee 汽車測試 系統(tǒng)設(shè)計
上傳時間： 2013-11-23
上傳用戶：dsgkjgkjg
針對目前采用的熱敏電阻測量方法，提出了采用單總線數(shù)字式溫度傳感器DS18B20和單片機組成的新型溫度測量儀。介紹DS18B20的結(jié)構(gòu)和工作原理，以及單總線工作原理，給出了由Mega8單片機和DS18B20構(gòu)成的單總線溫度測量儀的硬件電路及軟件流程圖。經(jīng)試驗基于單總線器件DS18B20的溫度測量儀，具有測量準確、測溫范圍寬、體積小、控制方便等優(yōu)點。 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.
上傳時間： 2013-10-31
上傳用戶：hzy5825468
針對當前安檢力學試驗機所能完成的試驗種類單一、自動化程度低等問題，提出一種以ATmega128單片機為核心控制器的安檢力學試驗機的設(shè)計。詳細闡述了該安檢力學試驗機各個組成部分的設(shè)計原理和方案，并且給出了各部分的軟件設(shè)計思想和操作流程。經(jīng)過大量測試試驗表明：設(shè)計的安檢力學試驗機可以完成多達十余種的力學安檢試驗，完全符合相關(guān)國家標準，并且具有數(shù)據(jù)采集精度高、傳輸速度快、操作安全簡便等特點，實現(xiàn)了安檢設(shè)備的多功能化、數(shù)字化和自動化。 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.
上傳時間： 2013-11-05
上傳用戶：a67818601
Bootloader是微處理器上電時運行的第一段代碼，它可以通過通信接口實現(xiàn)對微處理器內(nèi)部應(yīng)用程序的更新升級，為網(wǎng)絡(luò)化嵌入式產(chǎn)品的應(yīng)用程序升級帶來極大的便利。由于目前沒有統(tǒng)一嵌入式系統(tǒng)的Bootloader。基于NEC 78K0系列單片機自編程原理，設(shè)計出一個適用于78K0/Fx2系列單片機的Bootloader，并能夠通過單片機串口在線升級應(yīng)用程序。 Abstract: Bootloader is the first piece of code executed after microprocessor startup. It makes the embedded product’s firmware update conveniently through communication interface. However， no unified bootloader is available for all kinds of microprocessor products. Based on the principle of self-programming NEC 78K0s’ series， a useful Bootloader which is suitable for 78K0/Fx2s’ series MCU is designed，the design can update the application through serial ports.
標簽： Bootloader MCU 自編程
上傳時間： 2013-10-26
上傳用戶：fang2010
CCAVR軟件有ISP功能，能過調(diào)用STK500完成的，只要設(shè)置好參數(shù)，在ICCAVR中就可以給芯片編程了，還可以讓程序一編譯完就自動下載到芯片中，相當方便。在Tools->environment options->ISP里設(shè)定STK500.exe的路徑。— 用于調(diào)用STK500程序。在Tools->In system programming 里Programmer Interface中選中STK500。— 選擇STK500下載方式。在Tools->In system programming 里把Auto Program after Compile 的小勾選上。— 編譯后自動編程。在Tools->In system programming 中還有一些設(shè)置項，大家可以根據(jù)需要進行相關(guān)設(shè)置。下面的圖片是操作過程。
上傳時間： 2013-11-17
上傳用戶：joseph
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