為提高太陽能的利用率，以ATmega8單片機(jī)為控制核心，設(shè)計(jì)了一套光電跟蹤與視日運(yùn)動(dòng)軌跡跟蹤互補(bǔ)控制的雙軸太陽跟蹤器。該跟蹤器在晴天時(shí)，利用光敏電阻采集光強(qiáng)判斷太陽位置,控制步進(jìn)電機(jī)實(shí)現(xiàn)光電跟蹤；在陰天時(shí)，采集時(shí)鐘器件PCF8583的時(shí)間信息,計(jì)算當(dāng)前太陽位置來實(shí)現(xiàn)視日運(yùn)動(dòng)軌跡跟蹤。實(shí)驗(yàn)表明：該太陽跟蹤器能在不同天氣狀況下對太陽進(jìn)行較準(zhǔn)確地跟蹤，能量接收效率提高了30%，達(dá)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(shí)間： 2013-10-15
上傳用戶：urgdil
介紹一種采用單片機(jī)技術(shù)和基站器件EM4095的手持式低頻RFID讀卡器方案。首先對整個(gè)系統(tǒng)框架進(jìn)行說明，然后介紹主要功能模塊的設(shè)計(jì)，給出了各模塊的原理圖。重點(diǎn)描述了基站器件EM4095的性能參數(shù)和功能原理，最后描述了該系統(tǒng)的主程序流程圖。 Abstract: In this paper,a handheld RFID reader based on MCU and EM4095 is introduced.At first，the configuration of this system is explained.Then the design of main modules and schematic documents are particularly presented.The parameters and principle of the chip EM4095 are introduced in detail. At last，the main software flow is given
標(biāo)簽： 4095 RFID EM 單片機(jī)
上傳時(shí)間： 2013-10-18
上傳用戶：windypsm
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(jì)了一種基于DAC7512和單片機(jī)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(jì)算機(jī)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(dòng)縮放電路、電壓/電路變換電路和功率驅(qū)動(dòng)電路，最后輸出恒定電流。實(shí)驗(yàn)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(dá)0.024 4 mA，具有應(yīng)用靈活，外圍電路簡單，可靠性高的特點(diǎn)。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
標(biāo)簽： 7512 DAC 數(shù)控直流 恒流源
上傳時(shí)間： 2014-12-27
上傳用戶：invtnewer
針對目前采用的熱敏電阻測量方法，提出了采用單總線數(shù)字式溫度傳感器DS18B20和單片機(jī)組成的新型溫度測量儀。介紹DS18B20的結(jié)構(gòu)和工作原理，以及單總線工作原理，給出了由Mega8單片機(jī)和DS18B20構(gòu)成的單總線溫度測量儀的硬件電路及軟件流程圖。經(jīng)試驗(yàn)基于單總線器件DS18B20的溫度測量儀，具有測量準(zhǔn)確、測溫范圍寬、體積小、控制方便等優(yōu)點(diǎn)。 Abstract: This paper brings forward a new temperature meter composed of 1-Wire temperature sensor DS18B20 and MCU which has advantage of the thermistor. In the article, the DS18B20＇s structure and controlling principles are introduced and hardware circuit and software diagram of the temperature meter are given.After been tested,the temperature meter has the advantages of accurate measurement, wide temperature range, small volume and convenient controlling.
上傳時(shí)間： 2013-10-31
上傳用戶：hzy5825468
摘要：設(shè)計(jì)并制作了一種基于溫度梯度驅(qū)動(dòng)的液滴傳輸芯片，以實(shí)現(xiàn)對微液滴傳輸?shù)木_控制．介紹了驅(qū)動(dòng)原理和工藝流程，分析了仿真和實(shí)驗(yàn)結(jié)果．該芯片利用溫度梯度下液滴表面形成的表面張力梯度來傳輸液滴，采用玻璃作為襯底，Ｔｉ為電阻加熱器，Ａｕ為電極，ＰＥＣＶＤ氧化硅為介質(zhì)層，碳氟聚合物為疏水層，實(shí)現(xiàn)了器件制作．芯片采用開放式結(jié)構(gòu)，制作工藝簡單，操作方便．測試結(jié)果表明，驅(qū)動(dòng)功率為０．３８Ｗ時(shí)，去離子水和硅油的傳輸速率分別達(dá)到０．１ｍｍ燉ｓ和１ｍｍ燉ｓ．關(guān)鍵詞：微液滴；溫度梯度；表面張力梯度；電阻加熱器；開放式結(jié)構(gòu)
標(biāo)簽： 溫度 梯度驅(qū)動(dòng) 傳輸
上傳時(shí)間： 2013-10-29
上傳用戶：ukuk
摘要:介紹了以AT89C51單片機(jī)為控制中樞,利用EXB841專用驅(qū)動(dòng)及保護(hù)器件對功率模塊絕緣柵雙極晶體管(IGBT)進(jìn)行驅(qū)動(dòng)與保護(hù)的變頻器設(shè)計(jì)方法。介紹了EXB841在應(yīng)用中的一些原則性事項(xiàng),闡述了AT89C51單片機(jī)產(chǎn)生正弦脈寬調(diào)制(SPWM)脈沖的算法及編程方法,描述了異步電動(dòng)機(jī)在變壓變頻(VVVF)調(diào)速時(shí)的近似機(jī)械特性及變頻調(diào)速方式下的主要對策以及帶有反饋信號的輸出控制方式的實(shí)現(xiàn),最后給出了變頻調(diào)速控制下的實(shí)際數(shù)據(jù)。關(guān)鍵詞:IGBT;驅(qū)動(dòng);逆變;變壓變頻
上傳時(shí)間： 2013-11-07
上傳用戶：kristycreasy
宏晶STC90C58AD系列單片機(jī)器件手冊
上傳時(shí)間： 2013-10-15
上傳用戶：ZZJ886
STC8051系列單片機(jī)器件手冊
標(biāo)簽： 8051 STC 單片機(jī) 器件手冊
上傳時(shí)間： 2014-12-27
上傳用戶：shen_dafa
STC12C5410AD系列單片機(jī)器件手冊
上傳時(shí)間： 2013-11-11
上傳用戶：stewart·
STC12C5628AD系列單片機(jī)器件手冊
上傳時(shí)間： 2013-11-19
上傳用戶：linlin
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