51單片機各類源程序集錦,代碼為Keil C51環境,涉及CAN,EEPROM,LCD,LCM,IO_Key,LIN,RS232,RS485,RTC,TCPIP,USB1.0,USB2.0等。
上傳時間: 2013-06-12
上傳用戶:zhch602
微弱信號檢測裝置 四川理工學院 劉鵬飛、梁天德、曾學明 摘要: 本設計以TI的Launch Pad為核心板,采用鎖相放大技術設計并制作了一套微弱信號檢測裝置,用以檢測在強噪聲背景下已知頻率微弱正弦波信號的幅度值,并在液晶屏上數字顯示出所測信號相應的幅度值。實驗結果顯示其抗干擾能力強,測量精度高。 關鍵詞:強噪聲;微弱信號;鎖相放大;Launch Pad Abstract: This design is based on the Launch Pad of TI core board, using a lock-in amplifier technique designed and produced a weak signal detection device, to measure the known frequency sine wave signal amplitude values of the weak in the high noise background, and shows the measured signal amplitude of the corresponding value in the liquid crystal screen. Test results showed that it has high accuracy and strong anti-jamming capability. Keywords: weak signal detection; lock-in-amplifier; Launch Pad 1、引言 隨著現代科學技術的發展,在科研與生產過程中人們越來越需要從復雜高強度的噪聲中檢測出有用的微弱信號,因此對微弱信號的檢測成為當前科研的熱點。微弱信號并不意味著信號幅度小,而是指被噪聲淹沒的信號,“微弱”也僅是相對于噪聲而言的。只有在有效抑制噪聲的條件下有選擇的放大微弱信號的幅度,才能提取出有用信號。微弱信號檢測技術的應用相當廣泛,在生物醫學、光學、電學、材料科學等相關領域顯得愈發重要。 2、方案論證 針對微弱信號的檢測的方法有很多,比如濾波法、取樣積分器、鎖相放大器等。下面就針對這幾種方法做一簡要說明。 方案一:濾波法。 在大部分的檢測儀器中都要用到濾波方法對模擬信號進行一定的處理,例如隔離直流分量,改善信號波形,防止離散化時的波形混疊,克服噪聲的不利影響,提高信噪比等。常用的噪聲濾波器有:帶通、帶阻、高通、低通等。但是濾波方法檢測信號不能用于信號頻譜與噪聲頻譜重疊的情況,有其局限性。雖然可以對濾波器的通頻帶進行調節,但其噪聲抑制能力有限,同時其準確性與穩定性將大打折扣。
上傳時間: 2013-11-04
上傳用戶:lty6899826
In August of 1992 LTC published Application Note 49, “Illumination Circuitry for Liquid Crystal Displays.” One notable aspect of this event is that it generated more response than all previous LTC application notes combined. This level of interest, along with significant performance advances since AN-49’s appearance, justifies further discussion of LCD backlighting circuitry.
上傳時間: 2013-11-19
上傳用戶:lanjisu111
液晶顯示器,或稱LCD(Liquid Crystal Display),為平面超薄的顯示設備,它由一定數量的彩色或黑白像素組成,放置于光源或者反射面前方。
上傳時間: 2014-12-24
上傳用戶:bruce
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.
上傳時間: 2013-11-18
上傳用戶:xiaodu1124
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.
上傳時間: 2013-11-06
上傳用戶:yy_cn
技術相關信息 · 工具信息 · FAQs · 應用范例 -HA0003S HT48 & HT46 MCU 與 HT93LC46 的通信 -HA0004S HT48 & HT46 MCU UART 的軟件實現方法 -HA0013S HT48 & HT46 MCU LCM 接口設計 -HA0021S HT48 MCU輸入/輸出口的使用 -HA0055S 2^12 Decoder (8+4, 對應 HT12E)
上傳時間: 2013-10-16
上傳用戶:二十八號
本文提出了一種基于MCS-51 系列單片機的低成本恒溫控制設計方案,用AD590 進行溫度采集,以ADC0804 為AD 轉換裝置,通過LCM 液晶顯示,還兼有整點提醒、臨界溫度預警的功能.電路以及模塊化的程序編寫方法,重點介紹了ADC0804 及相關應用,液晶顯示模塊WG14432B-YYH-N 的特點、使用方法及其與單片機的接口電路。
上傳時間: 2013-10-22
上傳用戶:s363994250
Abstract: This reference design provides design ideas for a cost-effective, low-power liquid-level measurement dataacquisition system (DAS) using a compensated silicon pressure sensor and a high-precision delta-sigma ADC. Thisdocument discusses how to select the compensated silicon pressure sensor, suggest system algorithms, and providenoise analyses. It also describes calibration ideas to improve system performance while also reducing complexity andcost.
上傳時間: 2013-10-08
上傳用戶:sjy1991
SAMSUNG S6B33B0程序,LCM程序
上傳時間: 2014-03-02
上傳用戶:zukfu