介紹一種多功能音樂播放器，它是以AT89S52單片機為核心，并輔有一些外圍器件，采用匯編語言編寫程序，實現(xiàn)多功能音樂播放，歌曲自動循環(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)到喜愛曲目，液晶顯示當前播英文曲目。并給出了系統(tǒng)軟硬件設(shè)計。
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.
為滿足礦井安全生產(chǎn)要求，介紹了一種以AT89C51單片機為主控器，對環(huán)境空氣的溫度、有毒易燃氣體的濃度等進行檢測的監(jiān)控系統(tǒng)。該系統(tǒng)配合外圍電路能實現(xiàn)對上述環(huán)境指標的控制并存儲相關(guān)數(shù)據(jù)與上位PC機通信。它采用硬件抗干擾和軟件抗干擾技術(shù)，以確保整個系統(tǒng)工作的準確性。
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.
主要介紹了以PIC18F2480單片機為處理器，基于可編程多路開關(guān)檢測接口器件MC33993實現(xiàn)的車用多路開關(guān)檢測接口電路的設(shè)計。該設(shè)計克服了以往基于分立元件的檢測接口電路的弊端，簡化了接口電路設(shè)計，保證了車用開關(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.
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
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.
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.
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.
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, ...).
