為了提高環(huán)境參數(shù)采集的自動化水平，提升效率，設(shè)計了無線傳感器系統(tǒng)。本系統(tǒng)運用了傳感器技術(shù)、通信技術(shù)和單片機技術(shù)，實現(xiàn)了對環(huán)境溫度、濕度、光照度以及可燃性氣體濃度等參數(shù)的檢測。它能夠?qū)崟r地與上位機進(jìn)行無線通信，滿足對環(huán)境參數(shù)實時監(jiān)測的要求。 Abstract: In order to increase the degree of automation and improve the efficiency of the environment monitoring parameters，the wireless sensor system was developed.Combining with the technique of sensor,automatic monitoring，communication and single-chip microcomputer，it realized real-time monitoring environment parameters,such as temperature，humidity，illumination，concentration of com- bustible gas and so on.At the same time it can communicate with upper personal computers，satisfy the desire of real-time monitoring.
上傳時間： 2013-11-22
上傳用戶：longlong12345678
The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dotmatrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has40 outputs, of which 24 are programmable and configurable for the following ratios ofrows/columns: 32¤8, 24¤16, 16¤24 or 8¤32. The PCF8578 can function as a stand-alone LCDcontroller and driver for use in small systems. For larger systems it can be used inconjunction with up to 32 PCF8579s for which it has been optimized. Together these twodevices form a general purpose LCD dot matrix driver chip set, capable of driving displaysof up to 40960 dots. The PCF8578 is compatible with most microcontrollers andcommunicates via a two-line bidirectional bus (I2C-bus). Communication overhead isminimized by a display RAM with auto-incremented addressing and display bankswitching.
上傳時間： 2013-10-23
上傳用戶：頂?shù)弥?/p>
The CAT93C46 is a 1 kb Serial EEPROM memory device which isconfigured as either 64 registers of 16 bits (ORG pin at VCC) or 128registers of 8 bits (ORG pin at GND). Each register can be written (orread) serially by using the DI (or DO) pin. The CAT93C46 features aself−timed internal write with auto−clear. On−chip Power−On Resetcircuit protects the internal logic against powering up in the wrongstate.
上傳時間： 2013-11-20
上傳用戶：ynzfm
摘要:傳統(tǒng)的門鎖既要備有大量的鑰匙，又要擔(dān)心鑰匙丟失后的麻煩。隨著單片機的問世，出現(xiàn)了帶微處理器的密碼鎖，它除具有電子密碼鎖的功能外，還引入了智能化、科技化等功能，從而使密碼鎖具有很高的安全性、可靠性，受到了廣大用戶的親睞。本文介紹一種基于單片機和串行EEPROM的智能密碼鎖，對系統(tǒng)硬件設(shè)計和軟件實現(xiàn)進(jìn)行了詳細(xì)的描述。該系統(tǒng)采用STC89C51單片機和AT24C02串行EEPROM，通過STC89C51模擬I2C總線和AT24C02通訊來讀取存儲的密碼，用戶通過鍵盤輸入的密碼，實現(xiàn)密碼鎖的功能。
上傳時間： 2013-12-09
上傳用戶：JasonC
隨著通信技術(shù)的不斷發(fā)展，計算機網(wǎng)絡(luò)系統(tǒng)通信是當(dāng)今技術(shù)發(fā)展的一個重要的方向，然而在網(wǎng)絡(luò)系統(tǒng)中利用現(xiàn)有電話網(wǎng)作為通信方式則是最經(jīng)濟、最方便和最可靠的方法。當(dāng)前電話通信網(wǎng)已經(jīng)進(jìn)入程控交換時代，技術(shù)比較先進(jìn)，速度快，容量大，因此采用電話通信網(wǎng)建立數(shù)據(jù)通信系統(tǒng)確實具有其獨特的優(yōu)越性。利用單片機系統(tǒng)可用于采集灌區(qū)水位、水流量、電力抄表等方面，實現(xiàn)無人職守，方便管理。2.系統(tǒng)硬件設(shè)計：本系統(tǒng)采用了MODEM將前端單片機采集的數(shù)據(jù)通過電話網(wǎng)遠(yuǎn)程傳輸?shù)街行恼綪C機，并實現(xiàn)一對多點通信（站點數(shù)、通信距離均不限），后臺PC機通過撥號的方式對各站點進(jìn)行數(shù)據(jù)接收并實時存儲記錄、查詢、打印。單片機系統(tǒng)從傳感器直接采集數(shù)字信號，通過RS-232接口送給本端的MODEM，MODEM將數(shù)字信號調(diào)制成音頻模擬信號在電話線上傳輸，再經(jīng)中心站MODEM調(diào)制成數(shù)字信號送往PC機。系統(tǒng)中MODEM采用F-E56CSD-V1型嵌入MODEM，用戶使用賀氏標(biāo)準(zhǔn)AT命令呼叫和應(yīng)答，實現(xiàn)與遠(yuǎn)程系統(tǒng)的通信。
標(biāo)簽： 單片機 遠(yuǎn)程通信系統(tǒng)
上傳時間： 2013-11-05
上傳用戶：alan-ee
摘要:探討單片機之間或單片機與PC之間采用MODEM的實現(xiàn)方法，以及通訊參數(shù)的設(shè)定、數(shù)據(jù)的接收發(fā)送和部分AT命令的介紹，并給出演示程序。關(guān)鍵詞:MODEM 通訊 AT 命令 單片機
上傳時間： 2014-12-27
上傳用戶：yd19890720
摘要：介紹了一種以W78E52單片機為控制核心和調(diào)制解調(diào)器（MODEM）接口進(jìn)行遠(yuǎn)程數(shù)據(jù)采集與傳送的實用電路。該電路結(jié)構(gòu)簡單，可靠性高，控制方便。文中講述了MODEM的AT指令描述以及用單片機控制MODEM的方法，并結(jié)合系統(tǒng)功能及原理給出了主程序流程圖。關(guān)鍵詞：單片機；調(diào)制解調(diào)器；數(shù)據(jù)遠(yuǎn)程傳輸；W78E52
標(biāo)簽： MODEM 單片機 接口 遠(yuǎn)程數(shù)據(jù)傳輸
上傳時間： 2013-10-08
上傳用戶：Ants
車輛行駛性能的好壞，不僅取決于發(fā)動機，而且在很大程度上還依賴于變速器及變速器與發(fā)動機的匹配。在汽車上使用的自動變速器大致有三類：液力自動變速器（Automatic Transmission，AT）、電子控制機械自動變速器（AutomaticMechanicalTransmission，AMT）和金屬帶式無級變速器（Continuously Variable Transmission，CVT）。前兩種變速器都是有級或分段無級自動變速，無級變速器CVT避免了齒輪傳動比不連續(xù)的缺點，具有傳動比連續(xù)、傳遞動力平穩(wěn)、操縱方便、可使汽車行駛過程中經(jīng)常處于良好的性能狀態(tài)、可改善汽車排放和降低燃油消耗等特點，真正實現(xiàn)了無級變速。我國的汽車工業(yè)與發(fā)達(dá)國家有較大的差距，通過研制無級變速（CVT）控制系統(tǒng)對縮小差距和世新紀(jì)發(fā)展我國民族汽車工業(yè)都具有十分重要的意義。
上傳時間： 2013-11-11
上傳用戶：qingzhuhu
IntroductionAs chip designers pack more functions into ICs,pin counts continue to grow and the space betweenpins keeps shrinking. Pin spacings of 0.5 mm and0.65 mm are not at all uncommon. The power ofthese new ICs is wonderful, to be sure, but trou-bleshooting them can be a chore because connect-ing scopes and logic analyzers has become muchmore difficult and less dependable.
標(biāo)簽： Agilent Probing Wedge High
上傳時間： 2013-10-22
上傳用戶：蔣清華嗯
NXP Semiconductor designed the LPC2400 microcontrollers around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded Trace. The LPC2400 microcontrollers have 512 kB of on-chip high-speedFlash memory. This Flash memory includes a special 128-bit wide memory interface andaccelerator architecture that enables the CPU to execute sequential instructions fromFlash memory at the maximum 72 MHz system clock rate. This feature is available onlyon the LPC2000 ARM Microcontroller family of products. The LPC2400 can execute both32-bit ARM and 16-bit Thumb instructions. Support for the two Instruction Sets meansEngineers can choose to optimize their application for either performance or code size atthe sub-routine level. When the core executes instructions in Thumb state it can reducecode size by more than 30 % with only a small loss in performance while executinginstructions in ARM state maximizes core performance.
上傳時間： 2013-11-15
上傳用戶：zouxinwang
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