針對目前汽車追尾事件頻發(fā)問題，提出一種防汽車車前和車后追尾的安全裝置設(shè)計(jì)。該設(shè)計(jì)以高性能、低功耗的8位AVR微處理器ATmega8L為核心，結(jié)合霍爾式車速傳感器、激光雷達(dá)測距裝置和MMA7260QT加速度傳感器，能夠兼顧車前和車后，摒棄以往設(shè)計(jì)中只考慮車前或車后單一性缺點(diǎn)，尤其適用于高速、夜晚或新手行車。 Abstract: Aiming at the high frequency of vehicle rear-end collision，a safe device design of anti-vehicle rear-end collision is presented.In the design，the high-performance，low-power8-bit AVR microprocessor ATmega8L is utilized as a core combined with Hall-type speed sensor，laser-radar ranging devices and the acceleration sensor MMA7260QT.The design considers both the front and back of a car，and overcomes the drawbacks of former designs in which only the front or the back of the car is considered，so it is especially suitable for high-speed，night or the beginner’s driving.
上傳時間： 2013-10-14
上傳用戶：GavinNeko
常量：常量是在程序執(zhí)行過程中其值不能改變的量。常量的數(shù)據(jù)類型有整、浮點(diǎn)型、字符型和字符串型等，C51編譯器還擴(kuò)充了一種位（BIT）標(biāo)量。
標(biāo)簽： 單片機(jī) C語言 程序設(shè)計(jì)
上傳時間： 2013-11-06
上傳用戶：lwq11
描述 P89C660/662/664/668單片機(jī)內(nèi)帶6KB/32KB/64KB/64KBFlash存儲器,該存儲器既可并行編程也可以串行在系統(tǒng)編程(ISP).在實(shí)際的成型產(chǎn)品中,可通過ISP升級用戶程序在BootROM程序. 在Boot ROM程序中,可通過一個默認(rèn)的串行下載器(UART)對Flash存儲器作ISP編程,而在Flash代碼區(qū)中并不需要有調(diào)用下載器的代碼,用戶程序可通過調(diào)用在Boot ROM中的標(biāo)準(zhǔn)子程對Flash存儲器擦寫和再編程(即IAP).
上傳時間： 2013-10-18
上傳用戶：ouyang426
闡述了一個由上位PC機(jī)和AT89C52下位單片機(jī)組成的主從分布式溫度巡回檢測系統(tǒng)。主從機(jī)采用RS-485 串行通訊標(biāo)準(zhǔn)進(jìn)行通信，可在下位單片機(jī)實(shí)現(xiàn)基本的溫度數(shù)據(jù)巡回檢測基礎(chǔ)上，由上位PC機(jī)實(shí)現(xiàn)綜合處理功能或擴(kuò)展為遠(yuǎn)程操作。整個系統(tǒng)具有巡檢速度快，擴(kuò)展性好的特點(diǎn)。 Abstract: In this paper,a top PC and AT89C52 under-bit microcontrollers from the main component of the tour distributed temperature detection system is presented. Master and slave can use RS-485 serial communication standards for communications.Based on next-bit machine for basic goods temperature detected data Tour, the top can achieve the integrated treatment of PC functions or for the expansion of long-distance operation. The entire inspection system is fast, expansion.
上傳時間： 2013-10-13
上傳用戶：zhoujunzhen
Mega16是一款采用先進(jìn)RISC精簡指令，內(nèi)置A/D的8位單片機(jī)，可支持低電壓聯(lián)機(jī) Flash和EEPROM 寫入功能；同時還支持 Basic和C 等高級語言編程。用它設(shè)計(jì)電子時鐘不僅成本低，硬件簡單，而且很容易實(shí)現(xiàn)系統(tǒng)移植。介紹了如何利用AVR系列單片機(jī)Mega16及1602字符液晶來設(shè)計(jì)電子時鐘的方法，同時給出了相應(yīng)的電路原理及部分語言程序。 Abstract: ?Mega16 is a high-performance, low power consumption, the use of advanced RISC concise instructions, built-in A/D 8-bit microcontrollers, the on-line support for low-voltage Flash, EEPROM write function. Except Mega16 also support the Basic, C, and other high-level language programming.The electronic clock which is deisgned by Mega16 is not only low-cost, simple hardware, but easy to achieve system migration.The design method of electrioic clock based on the AVR Mega16 and character LCD1602 is introduced in this paper,and the corresponding circuit electrionic and some language program are given.
上傳時間： 2014-12-27
上傳用戶：zl5712176
針對51單片機(jī)系統(tǒng)中常用的A/D轉(zhuǎn)換器價格高、精度低的缺點(diǎn)，介紹TI公司的16 位的帶有I2C串行接口的A/D轉(zhuǎn)換器ADS1110的工作原理，給出ADS1110與AT89C51單片機(jī)系統(tǒng)的接口電路和軟件設(shè)計(jì)。實(shí)踐證明，ADS1110具有高性價比和實(shí)用性。 Abstract: According to the disadvantages of high expense and low accuracy of the general A/D converter used in MCS51 microchip system,the principle and working process of a high accuracy 16-bit A/D conversion ADS1110 which has I2C bus and belongs to TI Company are proposed here as well as the interface of ADS1110 to AT89C51 and software list.It is proved to be high performance index and practicability.
上傳時間： 2013-11-21
上傳用戶：gyq
介紹了基于單片機(jī)C8051F020的通用串口適配器的設(shè)計(jì)與實(shí)現(xiàn)方法，即由單片機(jī)控制的智能化一對多口收發(fā)信號轉(zhuǎn)換器。通過采用C51對單片機(jī)進(jìn)行編程，控制與RS-232（標(biāo)準(zhǔn)RS-232電平）、RS232(TTL電平)、RS-422接口的數(shù)據(jù)通信；采用C++ Builder作為開發(fā)平臺，通過RS-232接口實(shí)現(xiàn)上位機(jī)對適配器各個通信端口的控制。 Abstract: Design and realization of a universal serial port adapter based on the MCU C8051F020 are introduced.The adapter is an intelligent one-to-more receiving and transmitting signal converter controlled by the MCU. By programming the MCU with the language C51,MCU control data communication between the MCU and RS-232(RS-232 level),RS-232(TTL level),RS-422 port; Using C++ Builder as the development plane, by one RS232 port, the upper PC can control each of the communication port of the adapter.
上傳時間： 2013-11-19
上傳用戶：hebanlian
為解決輸油管道溫度壓力參數(shù)實(shí)時監(jiān)測的問題，設(shè)計(jì)了以C8051F930單片機(jī)作為控制核心的超低功耗輸油管道溫度壓力遠(yuǎn)程監(jiān)測系統(tǒng)。現(xiàn)場儀表使用高精度電橋采集數(shù)據(jù)，通過433 MHz短距離無線通信網(wǎng)絡(luò)與遠(yuǎn)程終端RTU進(jìn)行通信，RTU通過GPRS網(wǎng)絡(luò)與PC上位機(jī)進(jìn)行遠(yuǎn)程數(shù)據(jù)傳輸，在上位機(jī)中實(shí)現(xiàn)數(shù)據(jù)存儲和圖形化界面顯示，從而實(shí)現(xiàn)輸油管道溫度壓力參數(shù)的實(shí)時監(jiān)測和異常報警。經(jīng)實(shí)驗(yàn)證明，該系統(tǒng)的12位數(shù)據(jù)采集精度滿足設(shè)計(jì)要求，漏碼率小于1%，正常工作時間超過5個月，能實(shí)時有效地監(jiān)測輸油管道的溫度壓力參數(shù)，節(jié)省大量人工成本，有效預(yù)防管道參數(shù)異常造成的經(jīng)濟(jì)損失和環(huán)境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
標(biāo)簽： C8051F930 溫度 壓力 遠(yuǎn)程監(jiān)測系統(tǒng)
上傳時間： 2013-11-07
上傳用戶：cuibaigao
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.
標(biāo)簽： 2116 PCF LCD 驅(qū)動器芯片
上傳時間： 2013-11-08
上傳用戶：laozhanshi111
描述P89C660/662/664/668單片機(jī)內(nèi)帶6KB/32KB/64KB/64KB Flash存儲器,該存儲器既可并行編程也可以串行在系統(tǒng)編程(ISP).在實(shí)際的成型產(chǎn)品中,可通過ISP升級用戶程序. 在Boot ROM程序中可通過一個默認(rèn)的串行下載器(UART)對Flash存儲器作ISP編程,而在Flash代碼區(qū)中并不需要有調(diào)用下載器的代碼,用戶程序可通過調(diào)用在Boot ROM中的標(biāo)準(zhǔn)子程對Flash存儲器擦寫和再編程(即IAP). 該器件在6個時鐘周期內(nèi)執(zhí)行一條指令,是傳統(tǒng)的80C51的兩倍.一個OTP結(jié)構(gòu)位讓用戶選擇傳統(tǒng)的12個時鐘周期. 該器件用advanced CMOS工藝制造,是80C51單片機(jī)家族的衍生品.其指令集和80C51相同. 該器件有四個8位I/O口,三個16位定時器/事件計(jì)數(shù)器,多中斷源,四個優(yōu)選級,可嵌套中斷結(jié)構(gòu),一個增強(qiáng)型UART和片內(nèi)振蕩器以及時序電路. P89C660/662/664/668新增特性使其成為一個功能強(qiáng)大的單片機(jī),為某些應(yīng)用提供PWM,高速的I/O和加/減計(jì)數(shù),如汽車控制.
上傳時間： 2013-10-10
上傳用戶：FreeSky
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