針對(duì)目前使用的RS232接口數(shù)字化B超鍵盤(pán)存在PC主機(jī)啟動(dòng)時(shí)不能設(shè)置BIOS，提出一種PS2鍵盤(pán)的設(shè)計(jì)方法。基于W78E052D單片機(jī)，采用8通道串行A/D轉(zhuǎn)換器設(shè)計(jì)了8個(gè)TGC電位器信息采集電路，電位器位置信息以鍵盤(pán)掃描碼序列形式發(fā)送，正交編碼器信號(hào)通過(guò)XC9536XL轉(zhuǎn)換為單片機(jī)可接收的中斷信號(hào)，軟件接收到中斷信息后等效處理成按鍵。結(jié)果表明，在滿足開(kāi)機(jī)可設(shè)置BIOS同時(shí)，又可實(shí)現(xiàn)超聲特有功能，不需要專門(mén)設(shè)計(jì)驅(qū)動(dòng)程序，接口簡(jiǎn)單，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
標(biāo)簽： 單片機(jī) B超 數(shù)字化 鍵盤(pán)設(shè)計(jì)
上傳時(shí)間： 2013-10-10
上傳用戶：asdfasdfd
單片機(jī)系統(tǒng)設(shè)計(jì)其調(diào)試過(guò)程一般分為【軟件調(diào)試 硬件測(cè)試、系統(tǒng)調(diào)試3個(gè)過(guò)程軟件調(diào)試一般比較容易進(jìn)行，但硬件電路測(cè)試和系統(tǒng)調(diào)試則比較麻煩．因?yàn)檫@兩個(gè)過(guò)程必須侄電路扳制作完成，元器件焊接完畢之后進(jìn)行。如果采用作為單片 L系統(tǒng)的仿真]I~PROTEUS 則不用制作具體的電路扳也能夠完成以上工作。在使用PROTEUS進(jìn)行系統(tǒng)虛擬開(kāi)發(fā)成功之后再進(jìn)行實(shí)際制作，可以降低開(kāi)發(fā)成本、提高開(kāi)發(fā)速度。
標(biāo)簽： PROTEUS 51單片機(jī) 電路仿真
上傳時(shí)間： 2013-10-21
上傳用戶：dudu1210004
在航電系統(tǒng)維護(hù)過(guò)程中，為解決定位故障的效率和降低維修成本等問(wèn)題，提出了基于ICD（Interface Control Document，接口控制文件）的1553B總線的信息監(jiān)控系統(tǒng)模型。該系統(tǒng)運(yùn)用數(shù)據(jù)采集卡對(duì)總線中傳輸?shù)男盘?hào)有無(wú)失真、偏差等電氣特性進(jìn)行檢測(cè)，并使用1553B通訊卡通過(guò)測(cè)控軟件LabWindows/CVI編程與ICD數(shù)據(jù)庫(kù)的動(dòng)態(tài)鏈接，實(shí)現(xiàn)總線信息的解析和故障的判斷。與傳統(tǒng)的維護(hù)過(guò)程相比，這種模型能夠從信號(hào)的電氣特性以及信息的解析等全方位的去檢測(cè)判斷故障的來(lái)源，并且能夠廣泛在其他1553B總線系統(tǒng)內(nèi)擴(kuò)展應(yīng)用。驗(yàn)證表明該監(jiān)控系統(tǒng)可以對(duì)總線信息進(jìn)行快速有效地監(jiān)測(cè)分析，能滿足應(yīng)用需求。 Abstract: In the process of avionics system maintenance， to solve the problems such as improving the efficiency of fast orientation to troubles and reducing maintenance cost， system of 1553B bus information monitor model based on ICD was proposed. The system observed whether the data which transmitted on the bus appear distortion and deviation by using data acquisition card. And using 1553B communication card programming of the measure software LabWindows/CVI and the dynamic linking of ICD database， message analysis and fault estimation could be realized. Compared with traditional maintenance， this model can all-dimensionally detect and analyze the source of faults from both electrical characteristics of the signal and message analysis， and it can be widely applied in the other 1553B system. Experiment shown that this monitor system can effectively detect and analyze the bus message and can meet the application requirements.
標(biāo)簽： 1553B 總線 信息監(jiān)控
上傳時(shí)間： 2013-11-23
上傳用戶：18752787361
為了有效地提升鉛酸蓄電池的使用壽命，同時(shí)實(shí)現(xiàn)對(duì)充電過(guò)程的監(jiān)控，設(shè)計(jì)出一種用單片機(jī)控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓?fù)洌B續(xù)電流工作模式，電源管理IC設(shè)計(jì)在電源的副邊，由ELAN公司的EM78P258N單片機(jī)模擬，是用可編程器件模擬電源管理IC，實(shí)現(xiàn)智能電源低成本化的一次成功嘗試，通過(guò)對(duì)單片機(jī)的軟件設(shè)計(jì)實(shí)現(xiàn)了充電電源的狀態(tài)顯示、充電時(shí)間控制、報(bào)警、過(guò)溫保護(hù)、過(guò)壓保護(hù)、過(guò)流保護(hù)等功能。本充電器真正的實(shí)現(xiàn)了鉛酸蓄電池的三段式充電過(guò)程，其最高輸出功率可達(dá)90 W，效率約85%，成本不到20元，具有很高的市場(chǎng)競(jìng)爭(zhēng)力。 Abstract: In order to extend the life of lead-acid battery efficiently and supervise the charging process meanwhile， a 36V lead-acid battery charge powe supply controlled by microcontroller is designed. The charger is flyback switching power supply and works in CCM mode. A EM78P258N microcontroller made by ELAN microelectronics corporation is used as power management IC which is designed at the secondary circuit. The project is a successful attempt to low-cost intelligent power used microcontroller simulating power management IC. The charger also has the functions of the status reveal， charge time control， alarming， thermal protect， current limit and overvoltage protect by the software design. The circuit actually implements the three-step charge process， whose power is up to 90W and whose efficiency can get 85%. The net cost of this charger is less than 20 RMB， so that the charger is of powerful market competitiveness.
標(biāo)簽： 單片機(jī)控制 充電電源 鉛酸蓄電池
上傳時(shí)間： 2013-11-16
上傳用戶：cepsypeng
在通信系統(tǒng)中從多檢錯(cuò)手段中，CRC是非常著名的一種。CRC-全稱循環(huán)冗余校驗(yàn)是對(duì)數(shù)據(jù)塊校驗(yàn)的一種高效的差錯(cuò)控制方法。在單片機(jī)通信系統(tǒng)設(shè)計(jì)過(guò)程中，當(dāng)傳輸距離較遠(yuǎn)或是采用無(wú)線傳輸時(shí)，為了保證高效而無(wú)錯(cuò)地傳輸數(shù)據(jù)，必須對(duì)數(shù)據(jù)進(jìn)行檢錯(cuò)，從性能和成本上考慮，采用CRC校驗(yàn)算法遠(yuǎn)優(yōu)于奇遇校驗(yàn)和算術(shù)和校驗(yàn)等方法。CRC的計(jì)算有兩種方法，一種是采用專門(mén)的硬件，另一種就是軟件方法。對(duì)于小型低成本的51單片機(jī)系統(tǒng)而言，常常需要在沒(méi)有相關(guān)硬件的支持下實(shí)現(xiàn)CRC校驗(yàn)，也即通過(guò)軟件來(lái)完成CRC計(jì)算（CRC算法）。 這里給出了3種算法，從性能和成本上考慮，它們的適用范圍也稍有不同：第一種適用于單片機(jī)程序存儲(chǔ)空間較小但CRC計(jì)算速度要求不高的情況；第二種適用于程序存儲(chǔ)空間較大且CRC計(jì)算速度要求較高的情況；最后一種適用于程序存儲(chǔ)空間不太大，且CRC計(jì)算速度要求適中的情況。
標(biāo)簽： CRC 單片機(jī) 通信系統(tǒng) 算法
上傳時(shí)間： 2014-12-26
上傳用戶：dongbaobao
TDK公司的子公司TDK-EPC推出了愛(ài)普科斯PQ鐵氧體磁芯的擴(kuò)展系列。新加入了PQ40/40和PQ50/50磁芯后，PQ磁芯系列覆蓋了PQ16/11.6至PQ50/50的全部尺寸。 PQ磁芯專為開(kāi)關(guān)電源的變壓器研制。這些磁芯的插入高度可以調(diào)節(jié)，同時(shí)可以通過(guò)適當(dāng)調(diào)整磁芯保存相同的占用面積。新款鐵氧體磁芯可用于AC/DC和DC/DC轉(zhuǎn)換器中的標(biāo)準(zhǔn)繞線變壓器以及平面變壓器。 與傳統(tǒng)ETD/ER/E磁芯設(shè)計(jì)相比，PQ磁芯的主要優(yōu)勢(shì)在于擁有穩(wěn)定的圓形中心支腳和更大的外表面。憑借該圓形中心支腳和更大的繞組表面積，銅線的長(zhǎng)度得以縮短。因此，變壓器生產(chǎn)的成本也得以降低。此外，更大的外表面可以保證更好的散熱。PQ磁芯外形經(jīng)過(guò)優(yōu)化，從而可以更小的尺寸和重量獲得與e磁芯相同的變壓器性能。PQ磁芯可由多種鐵氧體材料制成，如：N49、N51、N87、N92、N95和N97。
標(biāo)簽： 鐵氧體 PQ芯 產(chǎn)品系列 擴(kuò)展
上傳時(shí)間： 2013-11-10
上傳用戶：zgu489
介紹一款單片機(jī)存儲(chǔ)設(shè)備轉(zhuǎn)儲(chǔ)器，以C8051F040為核心控制模塊，通過(guò)外接兩個(gè)CH375 U盤(pán)模塊、液晶顯示模塊及鍵盤(pán)模塊等實(shí)現(xiàn)兩個(gè)U盤(pán)之間數(shù)據(jù)的相互轉(zhuǎn)儲(chǔ)，很好地解決了U盤(pán)內(nèi)容轉(zhuǎn)儲(chǔ)離不開(kāi)電腦而帶來(lái)的不便以及容易感染病毒等弊端。C8051F040通過(guò)CH375 按照相應(yīng)的USB協(xié)議與USB設(shè)備通訊，通過(guò)調(diào)用CH375提供的子程序庫(kù)來(lái)直接讀取U盤(pán)中的數(shù)據(jù)，實(shí)現(xiàn)了普通單片機(jī)與U盤(pán)的通訊，支持常用的12 Mb/s 全速USB設(shè)備和1. 5 Mb/s低速設(shè)備。該設(shè)計(jì)方案具有低成本、低功耗、操作簡(jiǎn)單等特點(diǎn)，將會(huì)有廣闊的應(yīng)用前景。
標(biāo)簽： 單片機(jī) 存儲(chǔ)設(shè)備 轉(zhuǎn)儲(chǔ)器
上傳時(shí)間： 2013-12-17
上傳用戶：xzt
為提高溫度測(cè)量效率，降低系統(tǒng)的成本，擴(kuò)展傳輸距離，設(shè)計(jì)出一種新型溫度采集系統(tǒng)。單片機(jī)通過(guò)控制具有單總線方式的溫度傳感器DS18B20實(shí)現(xiàn)對(duì)溫度的測(cè)量，同時(shí)單片機(jī)通過(guò)控制具有單總線方式300～450MHz頻率范圍內(nèi)的MAX7044與MAX7033無(wú)線發(fā)射與接收芯片實(shí)現(xiàn)溫度數(shù)據(jù)的無(wú)線傳輸。與傳統(tǒng)溫度采集系統(tǒng)相比，該系統(tǒng)利用單總線方式連接，采用無(wú)線傳輸方式實(shí)現(xiàn)遠(yuǎn)距離通信，易于系統(tǒng)的集成與擴(kuò)展。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)結(jié)構(gòu)簡(jiǎn)單、方便移植，能夠同時(shí)實(shí)現(xiàn)多達(dá)上百點(diǎn)溫度的測(cè)量與500m范圍的傳輸。 Abstract: To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
標(biāo)簽： 單總線 無(wú)線溫度 采集 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-10-29
上傳用戶：515414293
飛機(jī)電網(wǎng)故障時(shí)，機(jī)載電氣盒必須在延遲時(shí)間內(nèi)切斷電網(wǎng)，保護(hù)機(jī)載設(shè)備。采用AT89S52設(shè)計(jì)的電氣盒測(cè)試儀能夠測(cè)試電氣盒保護(hù)功能，測(cè)量延遲時(shí)間。實(shí)際應(yīng)用結(jié)果表明，該測(cè)試儀具有測(cè)量準(zhǔn)確、可靠性高、成本低等優(yōu)點(diǎn)。 Abstract: The helicopter-electrical-box must shut off the helicopter power，protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has some advantages,such as accurate mea-surement,high dependability,economical cost etc.
上傳時(shí)間： 2014-12-27
上傳用戶：786334970
介紹了當(dāng)前普通標(biāo)記機(jī)控制系統(tǒng)現(xiàn)狀及其存在缺點(diǎn)，給出氣動(dòng)標(biāo)記機(jī)及相頻修正PWM模式的工作原理。采用ATmega16單片機(jī)和USB轉(zhuǎn)換RS232接口器件CH341T實(shí)現(xiàn)驅(qū)動(dòng)控制系統(tǒng)與PC的實(shí)時(shí)通訊，標(biāo)記控制系統(tǒng)可升級(jí)到USB接口。采用基于ATmega16的相頻修正PWM替換555振蕩電路產(chǎn)生的PWM，可直接通過(guò)軟件調(diào)整PWM信號(hào)。使用達(dá)林頓三極管TIP122替代直流繼電器驅(qū)動(dòng)高頻電磁閥，使得電磁閥驅(qū)動(dòng)電路簡(jiǎn)單，成本低廉。該控制系統(tǒng)已成功應(yīng)用于氣動(dòng)標(biāo)記機(jī)。 Abstract: In this paper,the actuality and demerit of the common gas marking machine control systems are described.The operation principle of the gas marking machine and the phase and frequency correct PWM of ATmega16is introduced.The real-time communication between the driving control system and PC by CH341T which its function is translated USB to RS232is realized,the control systems is updated grade to USB interface.The PWM signal can be adjustable by software for the555surge circuit was substituted by the phase and frequency.The high frequency electromagnetic value’s driving circuit by DC relay is replaced by TIP122,therefore,the circuit is become simple and the cost cheap.The control systems has been widely used in gas marking machine.
標(biāo)簽： ATmega 16 標(biāo)記 控制系統(tǒng)
上傳時(shí)間： 2013-10-18
上傳用戶：1427796291
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