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  • 基于凌陽單片機的步進電機加減速的控制方法

    提出一種基于凌陽單片機的步進電機加減速的控制方法。采用凌陽科技推出的16位結構工控單片機SPMC75F2413A為控制器,由Allegro公司生產的兩相步進電機專用驅動器件SLA7042M構成步進電機的驅動電路,在傳統的3段直線加減速控制算法基礎上增加至7段S形曲線加減速過程,控制步進電機的啟動和停止。實驗結果表明,該控制方法克服了直線加減速中不連續、易造成系統沖擊的問題,整個系統實現柔性控制,電機啟動、停止連續性能提高30%。 Abstract:  The method of controlled stepping motor is referred based on SPMC75F2413A MCU, which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of stepping motor. The experimental results sHow that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control, and the performance of motor start or stop continuity is increased 30%

    標簽: 凌陽單片機 步進電機 控制方法

    上傳時間: 2013-12-08

    上傳用戶:jiangfire

  • 基于ATmega8的雙軸太陽跟蹤器設計

    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.

    標簽: ATmega8 跟蹤器

    上傳時間: 2013-10-15

    上傳用戶:urgdil

  • 基于單總線式無線溫度采集系統設計

    為提高溫度測量效率,降低系統的成本,擴展傳輸距離,設計出一種新型溫度采集系統。單片機通過控制具有單總線方式的溫度傳感器DS18B20實現對溫度的測量,同時單片機通過控制具有單總線方式300~450MHz頻率范圍內的MAX7044與MAX7033無線發射與接收芯片實現溫度數據的無線傳輸。與傳統溫度采集系統相比,該系統利用單總線方式連接,采用無線傳輸方式實現遠距離通信,易于系統的集成與擴展。實驗結果表明,該系統結構簡單、方便移植,能夠同時實現多達上百點溫度的測量與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.

    標簽: 單總線 無線溫度 采集 系統設計

    上傳時間: 2013-10-29

    上傳用戶:515414293

  • 基于C8051F310的山路轉彎預防警示系統

    針對盤山路存在的轉彎盲區,即在轉彎時司機無法得知彎路對面是否有車輛通過,設計一種基于C8051F310的山路轉彎預防警示系統。該系統利用一階濾波算法檢測山路轉彎時是否有車輛通過。運用該算法可增強系統檢測的實時性,提高檢測機動車輛的靈敏度,同時大大減少環境溫度對檢測的干擾。試驗表明該系統能夠正確指示出在山路轉彎時是否有車輛通過,目前該系統已安裝在盤山路上,可大大減少事故的發生率。 Abstract:  Aiming at passing hilly road,there is a turn blind spot.Motormen usually do not know if the passing of vehicles pass the road.So a system of defending accident on hilly road is designed,which is based on MCU C8051F310.The sys-tem uses the first-order filter algorithm to detect whether there are passing vehicles.This algorithm enhances the real-time detection and improves the sensitivity of detection vehicles.Meanwhile,it reduces the detection interference of environmen-tal temperature.The experimental results sHow that this system can exactly indicate if there are passing vehicles.At present,the system has been successfully applied to hilly road.The system can greatly decrease accident.

    標簽: C8051F310 轉彎

    上傳時間: 2013-10-10

    上傳用戶:歸海惜雪

  • 基于AT89S52的機載電氣盒測試儀的設計

    飛機電網故障時,機載電氣盒必須在延遲時間內切斷電網,保護機載設備。采用AT89S52設計的電氣盒測試儀能夠測試電氣盒保護功能,測量延遲時間。實際應用結果表明,該測試儀具有測量準確、可靠性高、成本低等優點。 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.

    標簽: 89S S52 AT 89

    上傳時間: 2014-12-27

    上傳用戶:786334970

  • 基于AT89S52單片機的多功能音樂播放器

    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,實現多功能音樂播放,歌曲自動循環播放和使用琴鍵自編曲目功能。此外,彩燈顯示歌曲節奏,按鍵跳轉到喜愛曲目,液晶顯示當前播英文曲目。并給出了系統軟硬件設計。 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.

    標簽: 89S S52 AT 89

    上傳時間: 2013-11-18

    上傳用戶:xiaodu1124

  • 基于DAC7512的數控直流恒流源設計

    為了解決磁放大器性能測試過程中,需要對其供給不同數值恒定電流的問題,設計了一種基于DAC7512和單片機的數控恒流源系統。該系統采用AT89C51作為主控器件,將計算機發送的電流控制字命令轉換為D/A轉換器控制字,通過模擬SPI通信接口,寫D/A控制字到DAC7512,從而控制其輸出相應數字電壓值,經差動縮放電路、電壓/電路變換電路和功率驅動電路,最后輸出恒定電流。實驗結果表明,恒流源輸出電流調節范圍為-45~+45 mA、精度為±0.1 mA,分辨率達0.024 4 mA,具有應用靈活,外圍電路簡單,可靠性高的特點。該數控直流恒流源也可為相關產品的測試系統研發提供參考。 Abstract:  In order to solve the need to supply different values constant current for the magnetic amplifier in testing process, numerical control constant current source system was designed based on DAC7512 chip and microcontroller technology. The system used the AT89C51 as the main chip, which can convert the current control word from computer into to D/A control words. And the system wrote D/A control word into the DAC7512 chip to control the output voltage value by the SPI communication interface, which can output corresponding constant current figures by scaling circuit, the V/I converter and power drive circuit. Experimental results sHow that the current source output current adjustment range is -45~+45mA, accuracy is ± 0.1mA, and resolution ratio is 0.024 4mA

    標簽: 7512 DAC 數控直流 恒流源

    上傳時間: 2014-12-27

    上傳用戶:invtnewer

  • 基于UC3854A控制的PFC中分岔現象仿真研究

       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.

    標簽: 3854A 3854 PFC UC

    上傳時間: 2013-10-17

    上傳用戶:杜瑩12345

  • 基于ADuC841的膜片鉗放大器系統設計

    為降低成本和解決現有膜片鉗放大器系統中PC機的干擾問題,研究了一種基于單片機的膜片鉗放大器小系統。該系統采用ADI公司生產的ADuC841作為控制核心,并且配置相應的液晶顯示模塊LCM3202401。模擬電路部分采用高輸入阻抗的AD8627實現微電流信號的采集,并由后級電路進行信號的放大和電阻電容的補償。它具有硬件電路簡單、體積小、使用方便的特點。既可以單獨作為小系統實現采集和顯示,也可以通過紅外方式和PC機進行通訊,在PC機上進行信號的處理。 Abstract:  In order to reduce cost and resolve the interferential problem with PC in existing patch clamp amplifiers, a small patch clamp amplifier system design based on microcontroller is studied. It adopts a new high performance microconverter ADuC841 by the ADI as the control core in the system, configuring a liquid crystal module LCM3202401. In the analog circuit, AD8627 with high input impedance is used to detect the low current,signal magnification, as well as resistance and capacitance compensation are accomplished by subsequent circuits. It has the advantage of simple hardware circuit design, small volume and convenient operation. It can either be used as an independent system to measure and sHow signal detected or transmit to PC by infrared ray.

    標簽: ADuC 841 膜片鉗 放大器

    上傳時間: 2013-11-06

    上傳用戶:yy_cn

  • 基于C8051F系列單片機的無線收發電路設計

    基于幅移鍵控技術ASK(Amplitude-Shift Keying),以C8051F340單片機作為監測終端控制器,C8051F330D單片機作為探測節點控制器,采用半雙工的通信方式,通過監控終端和探測節點的無線收發電路,實現數據的雙向無線傳輸。收發電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線,天線直徑為(3.4±0.3)cm。試驗表明,探測節點與監測終端的通信距離為24 cm,通過橋接方式,節點收發功率為102 mW時,節點間的通信距離可達20 cm。與傳統無線收發模塊相比,該無線收發電路在受體積、功耗、成本限制的場合有廣闊的應用前景。 Abstract:  Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller, using half-duplex communication mode, this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter (3.4±0.3) cm circular hollow coil antenna. Tests sHow that the communication distance between detection and monitoring of the terminal is 24cm,the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules, the circuit has wide application prospect in small size, low cost and low power consumption and other characteristics.

    標簽: C8051F 單片機 無線收發 電路設計

    上傳時間: 2013-10-19

    上傳用戶:xz85592677

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