介紹了采用ATmega48單片機(jī)實(shí)現(xiàn)三相無刷直流電機(jī)控制器的方法。利用Atmega48獲得帶死區(qū)的脈寬調(diào)制（PWM）、霍爾傳感器的換相處理、正弦驅(qū)動信號的產(chǎn)生和電機(jī)轉(zhuǎn)速的控制等功能。采用該方法的優(yōu)點(diǎn)是所需的外圍器件少，成本低。 Abstract: The method of 3-phase brushless DC motor control based on ATmega48 is presented in this paper.The system uses ATmega48 to generate PWM signals with dead-time, hall sensors signals commutation，sine driving signal and rotational speed of motor.Using this method，the needed external devices are few, the cost is low.
標(biāo)簽： ATmega 48 無刷電機(jī) 控制方法
上傳時間： 2013-12-09
上傳用戶：330402686
氣壓是氣象監(jiān)測中的一個重要參數(shù)，提出了一種氣壓數(shù)據(jù)采集模塊設(shè)計(jì)方案，該模塊采用數(shù)字氣壓傳感器MS5534B、MSP430單片機(jī)MSP430F2272和帶實(shí)時時鐘（RTC）64 KB鐵電存儲器。通過低功耗軟件設(shè)計(jì)方法以微安級整體平均功耗實(shí)現(xiàn)了氣壓數(shù)據(jù)的采集和存儲，適合電池供電的連續(xù)高精度氣壓采集應(yīng)用。給出了模塊的軟硬件設(shè)計(jì)以及MS5534B的性能指標(biāo)和使用經(jīng)驗(yàn)。 Abstract: Air pressure is an important parameter in weather monitor.This paper futs forward a new design scheme of low power-air pressure data acquisition module.The module uses a digital output barometer sensor MS5534B,MSP430 microcontroller MSP430F2272 and integrated RTC 64KB FRAM,precision air pressure measurement and storage chip.Another point of this module is low power consumption, so it is well suited for battery powered air pressure data acquisition applications. At the same time,the software and hardware deign of module is presented,And the speciaties and use notices of MS5534B are given.
上傳時間： 2014-12-27
上傳用戶：drink！
采用單片機(jī)AT89C2051實(shí)現(xiàn)溫度測量與控制,鍵盤和顯示電路實(shí)現(xiàn)溫度的設(shè)定、修改、清零以及當(dāng)前溫度值的顯示,并對溫度超過上下限進(jìn)行報(bào)警。闡述了該系統(tǒng)設(shè)計(jì)的硬件和軟件設(shè)計(jì)。 Abstract: The system of temperature measuring and controling is realized based on AT89C2051.The keyboard and display circuit is designed,which can be used for setting and modifying temperature value,resetting and displaying the present temperature value.At the same time the warning circuit is also designed in the system,which can deal with the alarm when temperature exceeds the upper limit and the lower limit.The hardware and software design of the system are explained．
上傳時間： 2013-11-18
上傳用戶：leehom61
針對眾多低成本數(shù)據(jù)采集需求，采用帶有片上USB控制器和D/A轉(zhuǎn)換器的混合信號微處理器C8051F340，設(shè)計(jì)了一款可通過USB接口和LabVIEW圖形用戶界面實(shí)現(xiàn)與PC機(jī)聯(lián)機(jī)的數(shù)據(jù)采集器，同時借助系統(tǒng)的SD卡存儲獨(dú)立實(shí)現(xiàn)現(xiàn)場長時間采集數(shù)據(jù)。該數(shù)據(jù)采集器成本低，結(jié)構(gòu)簡單，體積小，已成功用于工業(yè)現(xiàn)場。 Abstract: Aiming at the need of low cost data acquisition, a data acquisition device is designed based on C8051F340 which is a mixed-signal microcontroller and integrates USB controller and A/D controller on a chip.The data acquisition device which can combine with PC by USB interface and LabVIEW graphical user interface,can realize data acquisition. At the same time,it can be solely run a long time in virtue of SD card in field.The date aequisition device features low cost,simple structure and little sharp, and it has been used in industry field.
標(biāo)簽： C8051F340 數(shù)據(jù) 集器設(shè)計(jì)
上傳時間： 2014-05-31
上傳用戶：1109003457
對于傳統(tǒng)的跑步機(jī)無法聯(lián)機(jī)組網(wǎng)，保存歷史數(shù)據(jù)，實(shí)時調(diào)試等問題，介紹了一個由多臺跑步機(jī)通過RS-232串行總線與上位機(jī)相連組成的跑步機(jī)聯(lián)網(wǎng)系統(tǒng)。系統(tǒng)采用W77E58作為下位機(jī)核心控制器件，它具有雙串行通訊端口，其中一個串口用于與變頻器通訊，另一個串口則與上位機(jī)相連，構(gòu)成跑步機(jī)網(wǎng)絡(luò)。 Abstract: The traditional running machine can not be connected to a network, saving historical data, real time debug etc.In this paper,a new network system which is composed of running machines connected by a RS-232 communication bus is introduced.In the system,W77E58 is used as a core control unit.W77E58 has two serial ports,one is connected to the inverter and the other is connected to the PC. Thus a network appears.
標(biāo)簽： W77E58 跑步機(jī) 聯(lián)網(wǎng)系統(tǒng)
上傳時間： 2014-12-27
上傳用戶：哇哇哇哇哇
詳細(xì)介紹了TLC1549系列模數(shù)轉(zhuǎn)換器的特點(diǎn)及工作原理，然后根據(jù)TLC1549的工作時序和A/D轉(zhuǎn)換原理針對實(shí)際問題編寫了詳細(xì)的匯編語言程序。 Abstract: A basic principle and characteristic of TLC1549 analog-to-digital converter are introduced? detailedly in this article.Through engineering-oriented illustration,a microcomputer programmer base on basic principle and time sequence of TLC1549 is writted.
上傳時間： 2014-07-16
上傳用戶：blans
對于瀝青混凝土攤鋪機(jī)自動找平控制系統(tǒng)來說，數(shù)字式控制系統(tǒng)的研制是目前的一個方向。介紹了一種基于CAN總線的數(shù)字式自動找平控制系統(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)簡單、信號穩(wěn)定、實(shí)時性強(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)
上傳時間： 2013-10-09
上傳用戶：ligi201200
在需要實(shí)時大量輸入漢字的顯示控制處理應(yīng)用中，利用傳統(tǒng)單片機(jī)實(shí)現(xiàn)顯示控制的設(shè)計(jì)方法是較難實(shí)現(xiàn)的。帶漢字字庫的液晶模塊的使用使得小容量ROM單片機(jī)的大量漢字信息輸入與顯示成為可能。提出了針對漢字字庫編碼的二級索引拼音輸入檢索方法,介紹了以ST7920作為控制器的帶漢字字庫的液晶顯示模塊的接口方法及漢字顯示和控制原理，給出了通用計(jì)算機(jī)鍵盤在單片機(jī)中的串行接口，采用該技術(shù)可大大增強(qiáng)單片機(jī)的漢字輸入功能。為小容量ROM單片機(jī)的大批量漢字信息處理提供了一種漢字輸入解決方案。 Abstract: It is difficult to realize Chinese characters input method based on the embedded system by using the traditional design method of display control. It is possible to input and display Chinese characters based on the embedded system with the ROM of small content by using the LCD module with Chinese characters.Chinese characters input method of the quadric index recall in allusion to Chinese characters code is brought forward.The interface and the principle of Chinese characters display control based on the LCD module controlled with the ST7920 is introduced too.The serial interface of the computer keyboard in common use and the embedded system is given at the same time. It can enhance the embedded system function of Chinese characters input by using this technology, and provide a kind of Chinese characters input scheme for the embedded system with small capacity ROM.
上傳時間： 2013-11-19
上傳用戶：jhksyghr
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(jì)了無線傳感器系統(tǒng)。本系統(tǒng)運(yùn)用了傳感器技術(shù)、通信技術(shù)和單片機(jī)技術(shù)，實(shí)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(jī)進(jìn)行無線通信，滿足對環(huán)境參數(shù)實(shí)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
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(bào)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
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