介紹一種多功能音樂(lè)播放器，它是以AT89S52單片機(jī)為核心，并輔有一些外圍器件，采用匯編語(yǔ)言編寫(xiě)程序，實(shí)現(xiàn)多功能音樂(lè)播放，歌曲自動(dòng)循環(huán)播放和使用琴鍵自編曲目功能。此外，彩燈顯示歌曲節(jié)奏，按鍵跳轉(zhuǎn)到喜愛(ài)曲目，液晶顯示當(dāng)前播英文曲目。并給出了系統(tǒng)軟硬件設(shè)計(jì)。 Abstract: It introduces a multifunctional music player,taking AT89S52 single-chip microcomputer as hardware control core and using some peripheral elements.Programmes are compiled in assembly language to act as expected.There are two functional modes in this system.One is to make the music play automatically and consecutively,the other is to compose new songs through keys.In addition,lights show the pace of music and the English names can be displayed in the liquid crystal screen.With perfect combination of hardware and software,the music player can meet many music lovers’needs for multifunctional music player.And the hardware and software of the system are given.
上傳時(shí)間： 2013-11-18
上傳用戶(hù)：xiaodu1124
為滿(mǎn)足礦井安全生產(chǎn)要求，介紹了一種以AT89C51單片機(jī)為主控器，對(duì)環(huán)境空氣的溫度、有毒易燃?xì)怏w的濃度等進(jìn)行檢測(cè)的監(jiān)控系統(tǒng)。該系統(tǒng)配合外圍電路能實(shí)現(xiàn)對(duì)上述環(huán)境指標(biāo)的控制并存儲(chǔ)相關(guān)數(shù)據(jù)與上位PC機(jī)通信。它采用硬件抗干擾和軟件抗干擾技術(shù)，以確保整個(gè)系統(tǒng)工作的準(zhǔn)確性。 Abstract: In order to meet the needs of mine produce safety，a kind of intellignet mine ambient monotoring and control system based on AT89C51 is introduced.This system can detect the temperature of ambient of mine，the density of poisonous inflammable gas,combined external circuit.With its function part， this system can change above-mentioned elements.
上傳時(shí)間： 2013-11-10
上傳用戶(hù)：wendy15
主要介紹了以PIC18F2480單片機(jī)為處理器，基于可編程多路開(kāi)關(guān)檢測(cè)接口器件MC33993實(shí)現(xiàn)的車(chē)用多路開(kāi)關(guān)檢測(cè)接口電路的設(shè)計(jì)。該設(shè)計(jì)克服了以往基于分立元件的檢測(cè)接口電路的弊端，簡(jiǎn)化了接口電路設(shè)計(jì)，保證了車(chē)用開(kāi)關(guān)工作的可靠性和安全性。 Abstract: The design of automotive multiple switch detection interface circuit based on MC33993 is introduced mainly which adopts PIC18F2480 single chip microprocessor.This circuit overcomes shortage of traditional design which contains many schism elements, and the application of MC33993 also predigests the whole design of interface circuit and guarantees the dependability and security of the switch.
標(biāo)簽： 33993 MC 多路開(kāi)關(guān) 檢測(cè)
上傳時(shí)間： 2013-11-19
上傳用戶(hù)：star_in_rain
Using the XGATE for Manchester DecodingTable of Contents 1 Introduction 1.1 XGATE Module in S12X 2 Decoding Algorithm 3 Software Implementation 3.1 Frame Scheme 3.2 Operating Modes and Demo 3.3 Files Summary 3.4 Complete Mode Flowchart 4 Manchester Encoder 4.1 Devices Used 5 Conclusion Appendix A Noise elements During RF Transmissions in the Manchester Decoding ImplementationA.1 Types of Noise A.2 Effects of Noise A.3 Workaround for Noise Effects
標(biāo)簽： Manchester XGATE 譯碼
上傳時(shí)間： 2013-10-15
上傳用戶(hù)：wqq123456
This application note describes how to decode standard DTMF tones using the minimum number of external discrete components and a PIC. The two examples use a PIC which has an 8 bit timer and either a comparator or an ADC, although it can be modified for use on a PIC which has only digital I/O. The Appendices have example code for the 16C662 (with comparator) and 16F877 (using the ADC). As the majority of the Digital Signal Processing is done in software, little is required in the way of external signal conditioning. Software techniques are used to model the individual elements of a DTMF Decoder IC.
標(biāo)簽： Decoding DTMF with PIC
上傳時(shí)間： 2013-11-21
上傳用戶(hù)：zhaoke2005
第一章 傳輸線(xiàn)理論一 傳輸線(xiàn)原理二 微帶傳輸線(xiàn)三 微帶傳輸線(xiàn)之不連續(xù)分析第二章 被動(dòng)組件之電感設(shè)計(jì)與分析一 電感原理二 電感結(jié)構(gòu)與分析三 電感設(shè)計(jì)與模擬四 電感分析與量測(cè)傳輸線(xiàn)理論與傳統(tǒng)電路學(xué)之最大不同，主要在于組件之尺寸與傳導(dǎo)電波之波長(zhǎng)的比值。當(dāng)組件尺寸遠(yuǎn)小于傳輸線(xiàn)之電波波長(zhǎng)時(shí)，傳統(tǒng)的電路學(xué)理論才可以使用，一般以傳輸波長(zhǎng)（Guide wavelength）的二十分之ㄧ（λ/20）為最大尺寸，稱(chēng)為集總組件（Lumped elements）；反之，若組件的尺寸接近傳輸波長(zhǎng)，由于組件上不同位置之電壓或電流的大小與相位均可能不相同，因而稱(chēng)為散布式組件（Distributed elements）。 由于通訊應(yīng)用的頻率越來(lái)越高，相對(duì)的傳輸波長(zhǎng)也越來(lái)越小，要使電路之設(shè)計(jì)完全由集總組件所構(gòu)成變得越來(lái)越難以實(shí)現(xiàn)，因此，運(yùn)用散布式組件設(shè)計(jì)電路也成為無(wú)法避免的選擇。 當(dāng)然，科技的進(jìn)步已經(jīng)使得集總組件的制作變得越來(lái)越小，例如運(yùn)用半導(dǎo)體制程、高介電材質(zhì)之低溫共燒陶瓷（LTCC）、微機(jī)電（MicroElectroMechanical Systems, MEMS）等技術(shù)制作集總組件，然而，其中電路之分析與設(shè)計(jì)能不乏運(yùn)用到散布式傳輸線(xiàn)的理論，如微帶線(xiàn)（Microstrip Lines）、夾心帶線(xiàn)（Strip Lines）等的理論。因此，本章以討論散布式傳輸線(xiàn)的理論開(kāi)始，進(jìn)而以微帶傳輸線(xiàn)為例介紹其理論與公式，并討論微帶傳輸線(xiàn)之各種不連續(xù)之電路，以作為后續(xù)章節(jié)之被動(dòng)組件的運(yùn)用。
標(biāo)簽： 傳輸線(xiàn)
上傳時(shí)間： 2013-11-10
上傳用戶(hù)：瀟湘書(shū)客
Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.
標(biāo)簽： EMI 開(kāi)關(guān)電源 英文
上傳時(shí)間： 2013-11-16
上傳用戶(hù)：萍水相逢
Giga Crime Fighting Mecha Gelato-Bots: The Supreme Icecream-Tron Revolution 8,000,000. A top-down adventure game with three themes; mecha, anime and icecream. This project hopes to evolve with action/rpg/multiplayer elements like classic console games.
標(biāo)簽： Icecream-Tron Gelato-Bots Revolution 000
上傳時(shí)間： 2013-12-18
上傳用戶(hù)：D&L37
OFELI is an object oriented library of C++ classes for development of finite element codes. Its main features are : * Various storage schemes of matrices (dense, sparse, skyline). * Direct methods of solution of linear systems of equations as well as various combinations of iterative solvers and preconditioners. * Shape functions of most "popular" finite elements * Element arrays of most popular problems (Heat Transfer, Fluid Flow, Solid Mechanics, Electromagnetics, ...).
標(biāo)簽： development oriented classes element
上傳時(shí)間： 2015-03-03
上傳用戶(hù)：kbnswdifs
merge sort give a set S of n integers and another integer x, determine whether or not there exits two elements in S whose sum is exactly x.
標(biāo)簽： determine integers another integer
上傳時(shí)間： 2013-12-23
上傳用戶(hù)：xmsmh
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