為提高電容測量精度，針對電容式傳感器的工作原理設計了基于PIC16LF874單片機電容測量模塊。簡單闡述了電容測量電路的應用背景和國內外研究現狀，介紹了美國Microchip公司PIC16LF874單片機的特性。電容式傳感器輸出的動態微弱電容信號通過PS021型電容數字轉換器把模擬量數據轉換成數字量數據，所測數據由PIC16LF874單片機應用程序進行處理、顯示和保存。實驗結果表明，固定電容標稱值為10~20 pF 的測量值相對誤差在1%以內，同時也可知被測電容容值越大，測量值和標稱值相對誤差越小。 Abstract: To improve the accuracy of capacitance measurement，aimed at the principle of work of mercury capacitance acceleration transducer，the design of micro capacitance measurement circuit is based on the Key PIC16LF874 chip. Briefly discusses the application of the capacitance measuring circuit for the background and status of foreign researchers，focusing on the United States PIC16LF874 microcontroller features. Capacitive sensor outputed signal through the dynamics of weak PS021-chip capacitors （capacitancedigital converter） to convert analog data into digital data，the measured data from the PIC16LF874 microcontroller application process， display and preservation. Experimental results show that the fixed capacitor 10pF ~ 20pF nominal value of the measured value of relative error is within 1%，but also it canbe seen the value of the measured capacitance larger，measuring value and the nominal value of relative error smaller.
上傳時間： 2013-10-29
上傳用戶：wojiaohs
在深入了解Flash存儲器的基礎上，采用單片機自動檢測存儲器無效塊。主要通過讀取每一塊的第1、第2頁內容，判斷該塊的好壞，并給出具體的實現過程，以及部分關鍵的電路原理圖和C語言程序代碼。該設計最終實現單片機自動檢測Flash壞塊的功能，并通過讀取ID號檢測Flash的性能，同時該設計能夠存儲和讀取1GB數據。 Abstract: On the basis of in-depth understanding the Flash chips，this paper designs a new program which using the SCM to detect the invalid block.Mainly through reading the data of the first and second page to detect the invalid block.Specific implementation procedure was given,and the Key circuit schematic diagram and C language program code was introduced.This design achieved the function of using the MCU checks the invalid block finally，and increased the function by reading the ID number of Flash to get the performance of the memory.And the design also can write and read1GB data
上傳時間： 2013-10-25
上傳用戶：taozhihua1314
在汽車發動機起動時，若發動機起動后起動機不能及時斷電，將會燒毀起動機或損壞飛輪齒環；若變速器不在空檔位置起動，則起動機的瞬間動力將使汽車位移，還可能引起交通事故和人身安全。為此介紹一種利用NXP P89LPC901單片機控制的汽車起動保護控制器，通過檢測汽車起動開關、變速箱檔位、發動機轉速，實現對汽車發動機起動過程檢測和保護。起動保護控制器在發動機起動過程中通過采用逐個關閉打開負載系統，解決汽車發動機過程中因起動電流大而對汽車電源的沖擊影響,延長了電瓶壽命。 Abstract: When the automotive engine is started, the engine start motor and flywheel gear may be damaged， even traffic accidents and personal safeties may be caused by wrong operation or other factors.In order to ensure the automotive engine can be started normally and safely,it is necessary that the protecting measures and methods are considered in the automotive electrical control system.This paper introduces a kind of the automotive engine starting protect controller based on NXP P89LPC901 MCU.The controller can protect the engine starting process by detecting the starter Key switch,transmission stall and engine speed.Through the use of close and open load system,the controller can solve the impact on automotive power because of the high-current load in the process of the automobile engine starting, and extend battery life.
上傳時間： 2013-10-15
上傳用戶：mikesering
MMC/SD卡以其優越的性能，在單片機嵌入式設備中得到廣泛應用。將MMC/SD卡作為外部掉電存儲介質應用于音頻信號發生器中，通過8051F330單片機上的SPI接口，實現單片機—MMC/SD卡的存儲擴展，設計了此硬件平臺上的MMC/SD卡的單片機驅動程序，并給出了相應的程序代碼，滿足音頻信號發生器的大容量存儲要求。 Abstract: MMC/SD card is more and more widely used in the single chip embedded devices for their excellent performances.This article introduces the application of MMC/SD card as the external power down storage medium in audio signal generator. The extension technology especially for storage of single chip-MMC/SD card via SPI interfaces in 8051F330 single chip, including designs single chip drive program of MMC/SD card based on hardware platform,and also gives the Key coding of the program. The implementation of big capacity storage is meaningful in audio signal generator.
上傳時間： 2014-12-27
上傳用戶：黃華強
出了一種利用ATmega8單片機對ISD2500系列語音芯片進行控制的智能語音系統，此系統使用靈活，易于功能升級，具有良好的應用前景。提供了硬件連接電路和關鍵源程序。 Abstract: An intelligent voice system using ISD2500 series voice chips based on ATmega8 MCU is described.This system is flexible and easy to upgrade for users,and it has pretty good using foreground. The circuit diagram and the Key program are also provided.
上傳時間： 2014-01-22
上傳用戶：Artemis
在介紹基于MSP430單片機的指紋保險柜工作原理的基礎上，從系統軟件設計的角度出發，詳細介紹了指紋保險柜軟件的總體分析過程、程序結構的設計以及代碼的編寫，給出了按鍵管理流程和部分源代碼。 Abstract: On basis of the operating principle of MSP430 microcontroller-based fingerprint safe,the general analyzing process,program designing and code compiling of the fingerprint safe software are introduced mainly,and the Key-press flows chart and some codes according to the system software designing are put forward.
上傳時間： 2014-12-27
上傳用戶：gaojiao1999
利用Atmel公司的ATmega168微處理器，采用A/D轉換方式來實現按摩椅控制器的鍵盤接口，通過在硬件電路中巧妙地選擇電阻，在軟件設計中采用數字濾波、二分法和區間鑒定等方法，靈敏可靠地實現了按摩椅中30個按鍵的處理。給出了硬件電路設計和軟件設計思想以及部分匯編代碼。 Abstract: This paper chooses A/D conversion method to realize the Keyboard interface of the controller by using ATmega168 microchip from Atmel Company.It accomplishes 30-Key dealing sensitively and reliably in massage chair through skillfully selecting resistors in hardware circuit and using digital filter,dichotomy and area-judging method in software design.The hardware design circuit, software design idea and partly assembles code are presented mainly.
上傳時間： 2014-01-10
上傳用戶：咔樂塢
介紹了一種基于MSP430系列單片機和ADXL203加速度傳感器的數字式傾角儀，它不僅可以實現水平度檢測，而且可以測量00～3600范圍內的任意傾角，分辨率可達O．1。。此外，由于該傾角儀輸出為數字結果，因此它也可以與其他的數字設備結合起來，組合成一個功能更加強大的儀器。該數字傾角儀可廣泛應用于建筑、機械、道路、橋梁、石油、煤礦和地質勘探等各種需要測量重力參考系下傾角的場合。關鍵詞：MSP430F133單片機；力敏傳感器；ADXL203加速度計；角度測量 Abstract：This paper presents a new style digital inclinometer which is developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer．This inclinometer not only can test levelness，but also can measure any angle between 0。and 360。with an accuracy of 0．1 O．In addition，its output is a digital result，which makes it possible to integrate itself with other digital devices to form a more functional unit．This inclinometer can be widely used in any construction site，oil field，coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles．Key words：MSP430F133 MCU；force sensor；ADXL203 accelerometer；angle measurement
上傳時間： 2013-11-14
上傳用戶：lizhizheng88
介紹了用單片機C 語言實現無功補償中電容組循環投切的基本原理和算法，并舉例說明。關鍵詞：循環投切;C51;無功補償中圖分類號： TM76 文獻標識碼： BAbstract: This paper introduces the aplication of C51 in the controlling of capacitorsuits cycle powered to be on and off in reactive compensation.it illustrate thefondamental principle and algorithm with example.Key words: cycle powered to be on and off; C51; reactive compensation 為提高功率因數，往往采用補償電容的方法來實現。而電容器的容量是由實時功率因數與標準值進行比較來決定的，實時功率因數小于標準值時，需投入電容組，實時功率因數大于標準值時，則需切除電容組。投切方式的不合理，會對電容器造成損壞，現有的控制器多采用“順序投切”方式，在這種投切方式下排序在前的電容器組，先投后切；而后面的卻后投先切。這不僅使處于前面的電容組經常處于運行狀態，積累熱量不易散失，影響其使用壽命，而且使后面的投切開關經常動作，同樣減少壽命。合理的投切方式應為“循環投切”。這種投切方式使先投入的運行的電容組先退出，后投的后切除，從而使各組電容及投切開關使用機率均等，降低了電容組的平均運行溫度，減少了投切開關的動作次數，延長了其使用壽命。
上傳時間： 2014-12-27
上傳用戶：hopy
本文針對實驗平臺管理系統的實際需求,結合密碼技術和身份認證技術,采用了基于USB Key的雙因子身份認證技術。目前眾多身份認證技術當中,USB Key是被認為最安全的身份認證手段,除了生物特征身份認證技術。但是因為成本問題,生物特征身份認證技術并沒有被廣泛使用。而且通過深入研究,可以進一步完善USB Key的功能,使USB Key不僅能起到認證的作用,還可以用于存儲數據。因此,隨著人們對網絡安全問題的重視程度加深,USB Key身份認證方式將在各安全需求領域大顯身手
上傳時間： 2014-12-27
上傳用戶：sun_pro12580
