Ominivision公司的新型攝像頭模組OV7670,具有體積小、輸出圖像格式多、接口方便、寄存器可讀寫等特點,是嵌入式系統中圖像采集的理想選擇。通過設置OV7670的寄存器的值,可以更好地實現對攝像頭的控制,得到更加理想的圖像。本文介紹了PC104系統對OV7670攝像頭模組寄存器讀寫的過程及編程方法。
上傳時間: 2013-11-23
上傳用戶:songyue1991
利用單片機具有的智能程序控制的特點,設計了基于STC89C52單片機的"二極管特性測試器",可對二極管一般特性進行快速測試。通過穩定線性電流源給二極管加載恒定電流,然后由高精度模數轉換器測試其壓降,以此為基礎可判斷二極管好壞、檢測二極管極性和測試二極管伏安特性等,避免了用萬用表測試只能測得極性而不知其特性這一缺點。可用于電子設計制作過程中對二極管進行快速測試,以確定被測二極管是否滿足電路的設計要求。 Abstract: By making good use of the intelligent control function of the Micro Controller Unit (MCU), the diode trait tester was designed based on the STC89C52,which could be used to test the trait of a diode rapidly. By loading constant current to diode through the stable linear current source, and measuring the voltage drop of the diode by high-precision analogue-to-digital converter (ADC), it can judge whether the diode is good or not, distinguish the polarity of the diode, and test the trait that the diode, which can avoid the fault of using a multimeter can only measure the polarity but not the trait. This device can be used to test the trait of a diode quickly,and to make sure that whether a diode can be used in the electronic design or not.
上傳時間: 2013-11-13
上傳用戶:assef
針對科研實驗中對拉壓千斤頂加載過程控制的需要,采用ATmega128單片機控制步進電機進而實現對執行系統的電動泵站實行自動控制。對力和位移的數據采集與處理及用步進電機控制電動泵站手柄的技術細節作了重點描述。通過單片機的A/D變換器對AMP放大模塊采集的電橋信號作量化處理,千斤頂的操控手柄位置依電動油泵閥門開啟的方向和大小作若干定位,單片機根據力或位移傳感器信號,實時控制步進電機驅動手柄旋轉到相應操控位置。 Abstract: This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.
上傳時間: 2014-01-16
上傳用戶:hasan2015
介紹一款單片機存儲設備轉儲器,以C8051F040為核心控制模塊,通過外接兩個CH375 U盤模塊、液晶顯示模塊及鍵盤模塊等實現兩個U盤之間數據的相互轉儲,很好地解決了U盤內容轉儲離不開電腦而帶來的不便以及容易感染病毒等弊端。C8051F040通過CH375 按照相應的USB協議與USB設備通訊,通過調用CH375提供的子程序庫來直接讀取U盤中的數據,實現了普通單片機與U盤的通訊,支持常用的12 Mb/s 全速USB設備和1. 5 Mb/s低速設備。該設計方案具有低成本、低功耗、操作簡單等特點,將會有廣闊的應用前景。
上傳時間: 2013-12-17
上傳用戶:xzt
為提高太陽能的利用率,以ATmega8單片機為控制核心,設計了一套光電跟蹤與視日運動軌跡跟蹤互補控制的雙軸太陽跟蹤器。該跟蹤器在晴天時,利用光敏電阻采集光強判斷太陽位置,控制步進電機實現光電跟蹤;在陰天時,采集時鐘器件PCF8583的時間信息,計算當前太陽位置來實現視日運動軌跡跟蹤。實驗表明:該太陽跟蹤器能在不同天氣狀況下對太陽進行較準確地跟蹤,能量接收效率提高了30%,達到充分利用太陽能的目的。 Abstract: To improve the utilization rate of solar energy,a kind of solar tracking controller which effectively combined the sun angle tracking and photo electric tracking based on ATmega8is designed.In the sunny days,the solar tracking con-troller determines the sun's position by using photosensitive resistances to collect light intensity and control stepper motors to achieve photo electric tracking,n cloudy days,it collects clock chip PCF8583time information to calculate the current position of the sun and achieve the sun angle tracking.Experimental results show the solar tracking controller accurately tracks the sun in different weather conditions,improves received energy efficiency by30%and reaches the purpose of full use of solar energy.
上傳時間: 2013-10-15
上傳用戶:urgdil
為深入了解基于UC3854A控制的PFC變換器中的動力學特性,研究系統參數變化對變換器中分岔現象的影響,在建立Boost PFC變換器雙閉環數學模型的基礎上,用Matlab軟件對變換器中慢時標分岔及混沌等不穩定現象進行了仿真。在對PFC變換器中慢時標分岔現象仿真的基礎上,分析了系統參數變化對分岔點的影響,并進行了仿真驗證。仿真結果清晰地顯示了輸入整流電壓的幅值變化對系統分岔點的影響。 Abstract: In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A, and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC (Power Factor Correction) converter controller was built. Then, with the help of Matlab, the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
上傳時間: 2013-10-17
上傳用戶:杜瑩12345
設計實現了一種基于MSP430系列超低功耗單片機的新型高精度自控式骨矯形器,介紹了系統的總體設計及硬件軟件設計。試驗表明,該骨矯形器可實現自控內固定、牽張、回縮及加壓固定功能,且功耗低、操控簡單、控制精度高、安全可靠。
上傳時間: 2013-10-16
上傳用戶:1427796291
根據汽車市場發展的需求,提出了以MSP430單片機作為核心的有關電子汽車限速器的硬軟件設計方案,指出了通過在踏板傳感器與電子控制單元之間插入一個限速器來達到汽車限速的目的。此電子限速器增加了“拆除”限速器功能,保證整個油門系統工作的穩定性。
上傳時間: 2013-11-10
上傳用戶:zhoujunzhen
1.設計任務分析 原理: 當按下開關,NE555計時器,4引腳于高電平,元件工作,電容C1充電,且2、6引腳達到高電平,此時輸出端3為低電平,揚聲器發出響聲;開關松開后,電容C1放電,在2、6引腳大于1/3Vcc前,3端為低電平,揚聲器工作;當放電使2、6端電平小于1/3Vcc,3端為高電平,揚聲器不工作。電容C2與滑動變阻器一起控制引腳4的狀態,使置零輸入端呈不同的臨界電壓,從而控制揚聲器響音時間的長短。當電路轉換時,2、6端電壓不同,使得輸出端3低電平電壓也不同,從而實現揚聲器的雙音。
上傳時間: 2013-10-08
上傳用戶:懶龍1988
引言 加速器控制是通過計算機和接口裝置對組成加速器的元器件如磁鐵電源、真空、高頻等實施控制 器的元器件如磁鐵電源、真空、高頻等實施控制和監測。控制是加速器的神經網絡,確保加速器設備間協調運作。 調運作。控制涵蓋的內容廣:計算機、網絡、操作系統、數據庫、應用軟件、設備接口及驅動、信號處理 數據庫、應用軟件、設備接口及驅動、信號處理和反饋、電子學等多方面的技術加速器控制屬于大型的控制系統,集成度要求高
上傳時間: 2013-10-28
上傳用戶:s363994250