對(duì)于瀝青混凝土攤鋪機(jī)自動(dòng)找平控制系統(tǒng)來說,數(shù)字式控制系統(tǒng)的研制是目前的一個(gè)方向。介紹了一種基于CAN總線的數(shù)字式自動(dòng)找平控制系統(tǒng)。該系統(tǒng)以CAN總線作為通信方式,PWM控制信號(hào)通過C8051F040單片機(jī)內(nèi)部PCA可編程計(jì)數(shù)器陣列產(chǎn)生,并具有結(jié)構(gòu)簡(jiǎn)單、信號(hào)穩(wěn)定、實(shí)時(shí)性強(qiáng)、易擴(kuò)展的特點(diǎn)。通過硬件實(shí)現(xiàn)和系統(tǒng)運(yùn)行達(dá)到了比較理想的控制效果,驗(yàn)證了系統(tǒng)的可行性。 Abstract: A digital auto-leveling control system based on CAN Bus is introduced.It uses CAN Bus as the method of communication and creates PWM signals by programmable counter array in C8051F040 microcontroller. The system is simple, stable, real-time and expansive.
標(biāo)簽: CAN 總線 數(shù)字式 控制系統(tǒng)設(shè)計(jì)
上傳時(shí)間: 2013-10-09
上傳用戶:ligi201200
為了在工業(yè)生產(chǎn)及過程控制中準(zhǔn)確測(cè)量溫度,設(shè)計(jì)了一種基于低功耗MSP430單片機(jī)的數(shù)字溫度計(jì)。整個(gè)系統(tǒng)通過單片機(jī)MSP430F1121A控制DS18B20讀取溫度,采用數(shù)碼管顯示,溫度傳感器DS18B20與單片機(jī)之間通過串口進(jìn)行數(shù)據(jù)傳輸。MSP430系列單片機(jī)具有超低功耗,且外圍的整合性高,DS18B20只需一個(gè)端口即可實(shí)現(xiàn)數(shù)據(jù)通信,連接方便。通過多次實(shí)驗(yàn)證明,該系統(tǒng)的測(cè)試結(jié)果與實(shí)際環(huán)境溫度一致,除了具有接口電路簡(jiǎn)單、測(cè)量精度高、誤差小、可靠性高等特點(diǎn)外,其低成本、低功耗的特點(diǎn)使其擁有更廣闊的應(yīng)用前景。 Abstract: In order to obtain accurate measuring temperature in industrial production and process control, a digital thermometer based on MSP430 MCU is designed. The system uses MSP430F1121A MCU to control DS18B20, and gets the temperature data, which is displayed on the LED. The temperature sensor DS18B20 and MCU transmit data through serial communication. MSP430 series has ultra-low power and high integration, DS18B20 only needs one port to achieve data communication. Through many experimental results prove, this system is consistent with actual environment temperature. The system has characteristics of interface circuit simple, high measuring accuracy, minor error, high reliability, besides, the characteristics of low cost and low power make it having vaster application prospect.
上傳時(shí)間: 2013-10-16
上傳用戶:wettetw
本文介紹了基于AT89C52 單片機(jī)的自動(dòng)水溫控制系統(tǒng)的設(shè)計(jì)及實(shí)現(xiàn)過程。該系統(tǒng)具有實(shí)時(shí)顯示、溫度測(cè)量、溫度設(shè)定并能根據(jù)設(shè)定值對(duì)環(huán)境溫度進(jìn)行調(diào)節(jié)實(shí)現(xiàn)控溫的目的以及達(dá)到上下限溫度報(bào)警功能,控制算法是基于數(shù)字PID 算法。關(guān)鍵詞 :PID AT89C52 脈寬調(diào)制 實(shí)時(shí) Abstract : This article describes AT89C52 single-chip microcomputer-basedautomatic water temperature control system design and implementation process. Thesystem has real-time display, temperature measurement, temperature settings and theenvironment in accordance with the temperature settings adjusted to achieve thepurpose of temperature control and reach the upper and lower limits of temperaturealarm function, the control algorithm is based on the digital PID algorithm.Keyword: PID AT89C52 PWM real time
上傳時(shí)間: 2013-10-10
上傳用戶:歸海惜雪
介紹了一種基于MSP430系列單片機(jī)和ADXL203加速度傳感器的數(shù)字式傾角儀,它不僅可以實(shí)現(xiàn)水平度檢測(cè),而且可以測(cè)量00~3600范圍內(nèi)的任意傾角,分辨率可達(dá)O.1。。此外,由于該傾角儀輸出為數(shù)字結(jié)果,因此它也可以與其他的數(shù)字設(shè)備結(jié)合起來,組合成一個(gè)功能更加強(qiáng)大的儀器。該數(shù)字傾角儀可廣泛應(yīng)用于建筑、機(jī)械、道路、橋梁、石油、煤礦和地質(zhì)勘探等各種需要測(cè)量重力參考系下傾角的場(chǎng)合。關(guān)鍵詞:MSP430F133單片機(jī);力敏傳感器;ADXL203加速度計(jì);角度測(cè)量 Abstract:This paper presents a new style digital inclinometer which is developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer.This inclinometer not only can test levelness,but also can measure any angle between 0。and 360。with an accuracy of 0.1 O.In addition,its output is a digital result,which makes it possible to integrate itself with other digital devices to form a more functional unit.This inclinometer can be widely used in any construction site,oil field,coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles.Key words:MSP430F133 MCU;force sensor;ADXL203 accelerometer;angle measurement
上傳時(shí)間: 2013-11-14
上傳用戶:lizhizheng88
FEATURES400 MSPS internal clock speedIntegrated 10-bit DAC32-bit tuning wordPhase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)Excellent dynamic performance>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUTSerial I/O control1.8 V power supplySoftware and hardware controlled power-down48-lead TQFP/EP packageSupport for 5 V input levels on most digital inputsPLL REFCLK multiplier (4× to 20×)Internal oscillator; can be driven by a single crystalPhase modulation capabilityMultichip synchronization
上傳時(shí)間: 2014-12-04
上傳用戶:axin881314
隨著單片機(jī)功能集成化的發(fā)展,其應(yīng)用領(lǐng)域也逐漸地由傳統(tǒng)的控制,擴(kuò)展為控制處理、數(shù)據(jù)處理以及數(shù)字信號(hào)處理(DSP,Digital Signal Processing)等領(lǐng)域。凌陽的16位單片機(jī)就是為適應(yīng)這種發(fā)展而設(shè)計(jì)的。它的CPU內(nèi)核采用凌陽最新推出的µ’nSP™(Microcontroller and Signal Processor)16位微處理器芯片(以下簡(jiǎn)稱µ’nSP™)。圍繞µ’nSP™所形成的16位µ’nSP™系列單片機(jī)(以下簡(jiǎn)稱µ’nSP™家族)采用的是模塊式集成結(jié)構(gòu),它以µ’nSP™內(nèi)核為中心集成不同規(guī)模的ROM、RAM和功能豐富的各種外設(shè)接口部件。
標(biāo)簽: SPCE 061A 061 單片機(jī)
上傳時(shí)間: 2013-11-07
上傳用戶:wpwpwlxwlx
dsPIC30F產(chǎn)品手冊(cè) High Performance Digital Signal Controllers This section of the manual contains the following topics:1.1 Introduction 1.2 Manual Objective 1.3 Device Structure1.4 Development Support 1.5 Style and Symbol Conventions 1.6 Related Documents 1.7 Revision History
標(biāo)簽: dsPIC 30F 30 產(chǎn)品手冊(cè)
上傳時(shí)間: 2013-12-26
上傳用戶:xzt
Virtex-5, Spartan-DSP FPGAs Application Note This application note demonstrates how efficient implementations of Digital Up Converters(DUC) and Digital Down Converters (DDC) can be done by leveraging the Xilinx DSP IPportfolio for increased productivity and reduced time to development. Step-by-step instruction is given on how to perform system-level trade off analysis and develop the most efficient FPGA implementation, thus allowing engineers a flexible, low-cost and low-power alternative to ASSP technologies.
標(biāo)簽: Spartan-DSP Virtex FPGAs Ap
上傳時(shí)間: 2013-10-23
上傳用戶:raron1989
PICmicro中檔單片機(jī)系列參考手冊(cè):請(qǐng)注意以下有關(guān)Microchip 器件代碼保護(hù)功能的要點(diǎn):• Microchip的產(chǎn)品均達(dá)到Microchip 數(shù)據(jù)手冊(cè)中所述的技術(shù)指標(biāo)。• Microchip確信:在正常使用的情況下, Microchip 系列產(chǎn)品是當(dāng)今市場(chǎng)上同類產(chǎn)品中最安全的產(chǎn)品之一。• 目前,仍存在著惡意、甚至是非法破壞代碼保護(hù)功能的行為。就我們所知,所有這些行為都不是以Microchip 數(shù)據(jù)手冊(cè)中規(guī)定的操作規(guī)范來使用Microchip 產(chǎn)品的。這樣做的人極可能侵犯了知識(shí)產(chǎn)權(quán)。• Microchip愿與那些注重代碼完整性的客戶合作。• Microchip或任何其它半導(dǎo)體廠商均無法保證其代碼的安全性。代碼保護(hù)并不意味著我們保證產(chǎn)品是“牢不可破”的。代碼保護(hù)功能處于持續(xù)發(fā)展中。Microchip 承諾將不斷改進(jìn)產(chǎn)品的代碼保護(hù)功能。任何試圖破壞Microchip 代碼保護(hù)功能的行為均可視為違反了《數(shù)字器件千年版權(quán)法案(Digital Millennium Copyright Act)》。如果這種行為導(dǎo)致他人在未經(jīng)授權(quán)的情況下,能訪問您的軟件或其它受版權(quán)保護(hù)的成果,您有權(quán)依據(jù)該法案提起訴訟,從而制止這種行為的。 Microchip 公司是The Embedded Control Solutions Company® (嵌入式控制系統(tǒng)解決方案公司),其產(chǎn)品主要滿足嵌入式控制市場(chǎng)的需求。我們是以下產(chǎn)品的領(lǐng)先供應(yīng)商:• 8 位通用單片機(jī)(PICmicro® 單片機(jī))• 專用和標(biāo)準(zhǔn)的非易失性存儲(chǔ)器件• 安防器件 (KEELOQ®)• 專用標(biāo)準(zhǔn)產(chǎn)品欲獲得您所感興趣的產(chǎn)品列表,請(qǐng)申請(qǐng)一份Microchip 產(chǎn)品線目錄。以往,8 位單片機(jī)的用戶只選擇傳統(tǒng)的MCU 類型,即ROM 器件,用于生產(chǎn)。Microchip 率先改變了這種傳統(tǒng)觀念,向人們展示了OTP (一次性編程)器件比ROM 器件在其壽命周期內(nèi)具有更低的產(chǎn)品成本。Microchip 具備EPROM技術(shù)優(yōu)勢(shì),從而使EPROM成為PICmicro 單片機(jī)程序存儲(chǔ)器的不二選擇。Microchip 盡可能地縮小了EPROM 和ROM 存儲(chǔ)器技術(shù)之間的成本差距,并使顧客從中受益。其他MCU 供應(yīng)商無法作到這一點(diǎn),這從他們的 EPROM 和 ROM 版本之間的價(jià)格差異便可以看出。Microchip 的8 位單片機(jī)市場(chǎng)份額的增長(zhǎng)證明了PICmicro® 單片機(jī)能夠滿足大多數(shù)人的需要。這也使PICmicro 單片機(jī)架構(gòu)成為了當(dāng)今通用市場(chǎng)上應(yīng)用最廣泛的三大體系之一。Microchip 的低成本OTP 解決方案所帶來的效益是這一增長(zhǎng)的助推劑。用戶能夠從以下各方面受益:• 快速的產(chǎn)品上市時(shí)間• 允許生產(chǎn)過程中對(duì)產(chǎn)品進(jìn)行代碼修改• 無需掩膜產(chǎn)品所需的一次性工程費(fèi)用(NRE)• 能夠輕松為產(chǎn)品進(jìn)行連續(xù)編號(hào)• 無需額外增加硬件即可存儲(chǔ)校準(zhǔn)數(shù)據(jù)• 可最大限度地增加PICmicro® 單片機(jī)的庫(kù)存• 由于在開發(fā)和生產(chǎn)中使用同一器件,從而降低了風(fēng)險(xiǎn)Microchip 的8 位 PICmicro 單片機(jī)具備很好的性價(jià)比,可成為任何傳統(tǒng)的8 位應(yīng)用和某些4 位應(yīng)用( 低檔系列)、專用邏輯的替代品以及低端DSP 應(yīng)用( 高檔系列) 的選擇。這些特點(diǎn)及其良好的性價(jià)比使PICmicro 單片機(jī)在大多數(shù)應(yīng)用場(chǎng)合極具吸引力。
標(biāo)簽: PICmicro 單片機(jī) 參考手冊(cè)
上傳時(shí)間: 2014-03-03
上傳用戶:ainimao
This application note describes how to decode standard DTMF tones using the minimum number of external discrete components and a PIC. The two examples use a PIC which has an 8 bit timer and either a comparator or an ADC, although it can be modified for use on a PIC which has only digital I/O. The Appendices have example code for the 16C662 (with comparator) and 16F877 (using the ADC). As the majority of the Digital Signal Processing is done in software, little is required in the way of external signal conditioning. Software techniques are used to model the individual elements of a DTMF Decoder IC.
標(biāo)簽: Decoding DTMF with PIC
上傳時(shí)間: 2013-11-21
上傳用戶:zhaoke2005
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