<button id="mwoou"></button> <button id="mwoou"></button> 很好用的通用遙控編碼邏輯分析軟件。
上傳時間： 2013-11-20
上傳用戶：CHINA526
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上傳時間： 2013-11-08
上傳用戶：manlian
介紹一種基于單片機控制的數(shù)控直流電流源。系統(tǒng)以AT89S52單片機為控制核心，由V/I轉(zhuǎn)換電路、DA轉(zhuǎn)換、AD轉(zhuǎn)換等模塊組成。通過按鍵設(shè)定電流值，并在LCD上同步顯示預(yù)設(shè)值，利用模擬閉環(huán)控制原理實現(xiàn)V/I轉(zhuǎn)換功能，采樣電阻兩端的電壓值送給A/D轉(zhuǎn)換電路，經(jīng)單片機換算成實際輸出電流值，并利用LCD顯示，供用戶參考。經(jīng)測試，本系統(tǒng)穩(wěn)定性好、精度較高、操作簡單、人機界面友好。在科學(xué)研究和設(shè)備生產(chǎn)中，能夠廣泛應(yīng)用到這種可靠性高、操作簡單的數(shù)控電流源，不僅能夠提高設(shè)備的性能，同時能夠縮短研發(fā)周期，本系統(tǒng)具有較高的實用性。
標簽： 51單片機 多功能 數(shù)控 電流源設(shè)計
上傳時間： 2013-11-06
上傳用戶：csgcd001
為解決電致變色器件的顏色變化受外界環(huán)境顏色控制的問題，設(shè)計了一種基于單片機的便攜式顏色自適應(yīng)識別電路。與傳統(tǒng)顏色識別電路相比較，該電路利用數(shù)字式的顏色傳感器來獲取外界環(huán)境顏色，產(chǎn)生的數(shù)字顏色信號易于單片機進行處理。在電路中，下位機部分主要負責(zé)獲取電致變色器件變色參數(shù)及控制電致變色器件的顏色變化;而上位機部分主要負責(zé)把下位機獲取的電致變色器件變色參數(shù)進行電壓到顏色的曲線擬合，并通過藍牙通信把擬合曲線參數(shù)傳遞給下位機。結(jié)果表明，該電路能自動根據(jù)環(huán)境顏色提供-4~4 V范圍步進為0.1 V的電壓來驅(qū)動電致變色器件的顏色顯示，與傳統(tǒng)的顏色識別電路設(shè)計相比，識別的精度和速度都得到了明顯改善。 Abstract: In this paper， a portable adaptive circuit for color identification(PACCI) based on MCU was designed. Compared to the traditional color identification circuit， the PACCI adopts digital sensor to detect the color data from external environment and further generate digital color data， which can be processed easily by MCU. In PACCI， the slave is mainly responsible for detecting the color parameters of the corresponding elcreochromic device and further driving it. For the master， which is mainly responsible for the color curve fitting based on the parameters of the electrochromic device， and transmits the fitting parameters to the slave through the bluetooth device. The results show that the PACCI can provide the basis voltage range from -4V to 4V automatically based on the colors of external environment with step as 0.1V to drive the corresponding electrochromic device. Compared to the traditional color recognition circuit， the recognition accuracy and speed of PACCI have been improved significantly.
上傳時間： 2013-11-09
上傳用戶：franktu
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單元，利用4×6小鍵盤、LCD顯示器和S1D13305液晶控制器達到良好的人機交互，設(shè)計出了一個應(yīng)用于化工領(lǐng)域的嵌入式實時溫度控制系統(tǒng)。相比于傳統(tǒng)溫度控制系統(tǒng)，該系統(tǒng)提供了更強的計算能力和可擴展能力，采用增量PID控制算法實現(xiàn)復(fù)雜控制。通過實驗，該系統(tǒng)能達到0.1 ℃的溫度控制精度以及小于120 s的溫度穩(wěn)定時間。 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.
標簽： 瑞薩電子 微控制器 溫度控制 系統(tǒng)設(shè)計
上傳時間： 2014-12-26
上傳用戶：003030
1. 型號緊跟的字母，表示電壓工作范圍。帶“V”：1.8-5.5V;若缺省，不帶“V”：2.7-5.5V。 例：ATmega48-20AU，不帶“V”表示工作電壓為2.7-5.5V。 2. 后綴的數(shù)字部分，表示支持的最高系統(tǒng)時鐘。 例：ATmega48-20AU，“20”表示可支持最高為20MHZ的系統(tǒng)時鐘。 3. 后綴第一(第二)個字母，表示封裝。“P”：DIP封裝，“A”：TQFP封裝，“M”：MLF封裝。 例：ATmega48-20AU，“A”表示TQFP封裝。 4. 后綴最后一個字母，表示應(yīng)用級別。“C”：商業(yè)級，“I”：工業(yè)級(有鉛)、“U”工業(yè)級(無鉛)。 例：ATmega48-20AU，“U”表示無鉛工業(yè)級。ATmega48-20AI，“I”表示有鉛工業(yè)級。
上傳時間： 2013-11-11
上傳用戶：jokey075
為了有效地提升鉛酸蓄電池的使用壽命，同時實現(xiàn)對充電過程的監(jiān)控，設(shè)計出一種用單片機控制的36 V鉛酸蓄電池充電電源。本電路采用反激式拓撲，連續(xù)電流工作模式，電源管理IC設(shè)計在電源的副邊，由ELAN公司的EM78P258N單片機模擬，是用可編程器件模擬電源管理IC，實現(xiàn)智能電源低成本化的一次成功嘗試，通過對單片機的軟件設(shè)計實現(xiàn)了充電電源的狀態(tài)顯示、充電時間控制、報警、過溫保護、過壓保護、過流保護等功能。本充電器真正的實現(xiàn)了鉛酸蓄電池的三段式充電過程，其最高輸出功率可達90 W，效率約85%，成本不到20元，具有很高的市場競爭力。 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.
上傳時間： 2013-11-16
上傳用戶：cepsypeng
序號 參數(shù) 數(shù)據(jù) 單位 參數(shù) 說 明 . 輸 入 參 數(shù) 變 量 1 umin V 交流輸入電壓最小值 2 umax V 交流輸入電壓最大值 3 fL Hz 電網(wǎng)頻率 4 f kHz 開關(guān)頻率 5 UO V 直流輸出電壓 6 PO W 輸出功率 7 η % 電源效率 8 Z 0.5 損耗分配系數(shù) 9 UFB V 反饋電壓
標簽： 反激式開關(guān)電源 電子 數(shù)據(jù)表格
上傳時間： 2013-10-14
上傳用戶：小碼農(nóng)lz
為了解決磁放大器性能測試過程中，需要對其供給不同數(shù)值恒定電流的問題，設(shè)計了一種基于DAC7512和單片機的數(shù)控恒流源系統(tǒng)。該系統(tǒng)采用AT89C51作為主控器件，將計算機發(fā)送的電流控制字命令轉(zhuǎn)換為D/A轉(zhuǎn)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(yīng)數(shù)字電壓值，經(jīng)差動縮放電路、電壓/電路變換電路和功率驅(qū)動電路，最后輸出恒定電流。實驗結(jié)果表明，恒流源輸出電流調(diào)節(jié)范圍為-45~+45 mA、精度為±0.1 mA，分辨率達0.024 4 mA，具有應(yīng)用靈活，外圍電路簡單，可靠性高的特點。該數(shù)控直流恒流源也可為相關(guān)產(chǎn)品的測試系統(tǒng)研發(fā)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
上傳時間： 2014-12-27
上傳用戶：invtnewer
1 FEATURES· Single chip LCD controller/driver· 1 or 2-line display of up to 24 characters per line, or2 or 4 lines of up to 12 characters per line· 5 ′ 7 character format plus cursor; 5 ′ 8 for kana(Japanese syllabary) and user defined symbols· On-chip:– generation of LCD supply voltage (external supplyalso possible)– generation of intermediate LCD bias voltages– oscillator requires no external components (externalclock also possible)· Display data RAM: 80 characters· Character generator ROM: 240 characters· Character generator RAM: 16 characters· 4 or 8-bit parallel bus or 2-wire I2C-bus interface· CMOS/TTL compatible· 32 row, 60 column outputs· MUX rates 1 : 32 and 1 : 16· Uses common 11 code instruction set· Logic supply voltage range, VDD - VSS: 2.5 to 6 V· Display supply voltage range, VDD - VLCD: 3.5 to 9 V· Low power consumption· I2C-bus address: 011101 SA0.
上傳時間： 2013-11-08
上傳用戶：laozhanshi111
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