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為了提高傳統(tǒng)溫度控制系統(tǒng)的性能，將PID控制理論與嵌入式系統(tǒng)相結(jié)合，采用瑞薩電子公司的H8S/2166作為核心處理器，AD公司的AD7705以及熱敏電阻溫度傳感器作為溫度檢測(cè)單元，利用4×6小鍵盤、LCD顯示器和S1D13305液晶控制器達(dá)到良好的人機(jī)交互，設(shè)計(jì)出了一個(gè)應(yīng)用于化工領(lǐng)域的嵌入式實(shí)時(shí)溫度控制系統(tǒng)。相比于傳統(tǒng)溫度控制系統(tǒng)，該系統(tǒng)提供了更強(qiáng)的計(jì)算能力和可擴(kuò)展能力，采用增量PID控制算法實(shí)現(xiàn)復(fù)雜控制。通過(guò)實(shí)驗(yàn)，該系統(tǒng)能達(dá)到0.1 ℃的溫度控制精度以及小于120 s的溫度穩(wěn)定時(shí)間。
Abstract:
In order to improve the performance of conventional temperature control system， combining PID control theory with embedded systems， using the Renesas Electronics Corp. H8S/2166 micro-controller as a core processors， AD7705 and thermistor temperature sensor as a temperature detection unit and 4×6 small keyboard， LCD and S1D13305 LCD controller as a good human-computer interaction， this paper designed an embedded real-time temperature control system which is applied in chemical industry. Compared with conventional temperature control system， this system provides more computing power and extensibility， and adopts PID control algorithm for Complex control. Through the experiment， the system can reach temperature control accuracy of 0.1 ℃ and temperature stabilization time of less than 120 seconds.
標(biāo)簽：
瑞薩電子
微控制器
溫度控制
系統(tǒng)設(shè)計(jì)
上傳時(shí)間：
2014-12-26
上傳用戶：003030
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AVR32801: UC3A3 Schematic Checklist Features • Power circuit • Reset circuit • USB connection • External bus interface • ABDAC sound DAC interface • JTAG and Nexus debug ports • Clocks and crystal oscillators • MMC, SD-card, SDHC, SDIO and CE-ATA interface 1 Introduction A good hardware design comes from a proper schematic. Since UC3A3 devices have a fair number of pins and functions, the schematic for these devices can be large and quite Complex. This application note describes a common checklist which should be used when starting and reviewing the schematics for a UC3A3 design.
標(biāo)簽：
Schematic
32801
UC3A3
Chec
上傳時(shí)間：
2014-12-26
上傳用戶：DXM35
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雖然PIC都是8位的單片機(jī)，但都采用RISC（Reduced Instruction Set Computing）核心結(jié)構(gòu)，這有別于過(guò)去一般的CISC(Complex Instruction Set Computing)結(jié)構(gòu)。所謂RISC結(jié)構(gòu)就是采用哈佛雙總線結(jié)構(gòu)，將地址總線與數(shù)據(jù)總線分開，因此在同一個(gè)指令執(zhí)行過(guò)程中，數(shù)據(jù)與地址可以同時(shí)傳送，避免了總線處理上的瓶頸。
標(biāo)簽：
f877
PIC
16f
877
上傳時(shí)間：
2013-11-21
上傳用戶：tianyi223
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機(jī)電類比法是一種把機(jī)械量通過(guò)一定的計(jì)算等效類比為電量的方法，其在對(duì)電子機(jī)械系統(tǒng)的分析中應(yīng)用非常廣泛。它能夠把一個(gè)較復(fù)雜的機(jī)械系統(tǒng)類比為我們熟知的電路系統(tǒng)來(lái)進(jìn)行分析，從而使問(wèn)題的分析得到簡(jiǎn)化。本文通過(guò)對(duì)振弦式傳感器的分析介紹了機(jī)電類比法，并對(duì)使用電路進(jìn)行了相關(guān)的分析。 Summary：The electromechanical analogy is assort of analysis which is to analogize the mechanical system by using circuit system , it applied widely in the filed of analysis the electronic-mechanical system. The analysis can take a Complex mechanical system analogous to a circuitry that we well-known, which can simplify the problems. In the paper, the electro-mechanical analogy method is briefly introduced by analysis the vibrating wire sensor，and have a correlation analysis about the circuit we used.關(guān)鍵詞： 機(jī)電類比法 振弦式傳感器 頻率 振蕩 反饋Keyword：electro-mechanical analogy method，vibrating wire sensor，frequency, oscillation, feedback
0 引言振弦式傳感器是屬于頻率式傳感器的一種。所謂頻率式傳感器就是能直接將被測(cè)量轉(zhuǎn)換為振動(dòng)頻率信號(hào)的傳感器，這類傳感器一般是通過(guò)測(cè)量振弦、振筒、振梁、振膜等彈性振體或石英晶體諧振器的固有諧振頻率來(lái)達(dá)到測(cè)量引起諧振頻率變化的被測(cè)非電量的目的，其也稱為諧振式傳感器[1]。在分析該類傳感器中，由于其涉及到頻率，就容易讓人聯(lián)想到在電子技術(shù)中接觸到的RLC振蕩電路。因此可以嘗試著用類比的方法使之對(duì)應(yīng)起來(lái)分析,即機(jī)電類比法分析。
標(biāo)簽：
機(jī)電
傳感器
分
類比法
上傳時(shí)間：
2013-11-16
上傳用戶：paladin
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CodeWarrior Development Tool Suites are comprehensive integrated developmentenvironments (IDE) that provide a highly visual and automated framework toaccelerate the development of the most Complex embedded applications. Acrossmost stages of the development cycle, we offer tools to help configure, debug andoptimize your design built on Freescale MPUs, MCUs, DSPs and DSCs. These toolsuites provide solutions to get your design up and running fast.
標(biāo)簽：
CodeWarrior
開發(fā)工具套件
上傳時(shí)間：
2013-11-07
上傳用戶：youlongjian0
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With the Altera Nios II embedded processor, you as the system designercan accelerate time-critical software algorithms by adding custominstructions to the Nios II processor instruction set. Using custominstructions, you can reduce a Complex sequence of standard instructionsto a single instruction implemented in hardware. You can use this featurefor a variety of applications, for example, to optimize software innerloops for digital signal processing (DSP), packet header processing, andcomputation-intensive applications. The Nios II configuration wizard,part of the Quartus® II software’s SOPC Builder, provides a graphicaluser interface (GUI) used to add up to 256 custom instructions to theNios II processor
標(biāo)簽：
NIOSII
用戶
定制
指令
上傳時(shí)間：
2013-11-07
上傳用戶：swing
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Abstract: The process of designing a radio system can be Complex and often involves many project tradeoffs. Witha little insight, balancing these various characteristics can make the job of designing a radio system easier. Thistutorial explores these tradeoffs and provides details to consider for various radio applications. With a focus on theindustrial, scientific, medical (ISM) bands, the subjects of frequency selection, one-way versus two-way systems,modulation techniques, cost, antenna options, power-supply influences, effects on range, and protocol selectionare explored.
標(biāo)簽：
無(wú)線
上傳時(shí)間：
2013-12-13
上傳用戶：eastgan
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Abstract: This application note describes system-level characterization and modeling techniques for radio frequency (RF) and microwavesubsystem components. It illustrates their use in a mixed-signal, mixed-mode system-level simulation. The simulation uses an RF transmitterwith digital predistortion (DPD) as an example system. Details of this Complex system and performance data are presented.
標(biāo)簽：
射頻
仿真
微波系統(tǒng)
建模
上傳時(shí)間：
2013-12-18
上傳用戶：onewq
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Radio frequency (RF) can be a Complex subject to navigate, but it does not have to be. If you are just getting started with radios or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference for those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference for Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference for all things RF.
標(biāo)簽：
射頻
基礎(chǔ)知識(shí)
上傳時(shí)間：
2013-10-23
上傳用戶：685
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Radio frequency (RF) can be a Complex subject to navigate, but it does not have to be. If you are just getting started with radios or maybe you cannot find that old reference book about antenna aperture, this guide can help. It is intended to provide a basic understanding of RF technology, as well act as a quick reference for those who “know their stuff” but may be looking to brush up on that one niche term that they never quite understood. This document is also a useful reference for Maxim’s products and data sheets, an index to deeper analysis found in our application notes, and a general reference for all things RF.
標(biāo)簽：
無(wú)線技術(shù)
上傳時(shí)間：
2013-10-08
上傳用戶：kinochen
