提出了用“過采樣”技術(shù)使在有用的測量頻帶內(nèi)的信噪比得到改善, 從而提高ADC 測量的分辨率。并利用Matlab 對其結(jié)論進(jìn)行仿真, 且在TMS320L F2407 DSP 上予以實(shí)現(xiàn),結(jié)果表明信噪比和測量分辨率明顯提高。
上傳時(shí)間： 2013-11-20
上傳用戶：fairy0212
USB2I2C是一個(gè)USB總線的轉(zhuǎn)I2C總線的專用接口芯片。通過USB2I2C芯片用戶可以非常方便地實(shí)現(xiàn)PC機(jī)USB總線和下位機(jī)端各種I2C/IIC設(shè)備（如，ATMEL公司的AT24CXX系列EEPROM；I2C總線8位并行IO口擴(kuò)展芯片PCF8574/JLC1562；I2C接口實(shí)時(shí)時(shí)鐘芯片DS1307/PCF8563/SD2000D/M41T80/ME901/ISL1208/；I2C數(shù)據(jù)采集ADC芯片MCP3221（12bitADC）/ADS1100（16bitADC）/ADS1112（16bitADC）/MAX1238（12bitADC）/MAX1239（12bitADC）；I2C接口數(shù)模轉(zhuǎn)換DAC芯片DAC5574（8bitDAC）/DAC6573（10bitDAC）/DAC8571 （16bitDAC）/；I2C接口溫度傳感器TMP101/TMP275/DS1621/MAX6625，等）之間的通信。 USB2I2C芯片上位機(jī)PC端提供簡單易用的USBIOX.DLL動(dòng)態(tài)庫調(diào)用，可以方便地被VB，VC，Delphi等上位機(jī)開發(fā)工具調(diào)用
上傳時(shí)間： 2014-12-26
上傳用戶：Amygdala
基于單片機(jī)的多路數(shù)據(jù)采集系統(tǒng)
標(biāo)簽： 單片機(jī) 多路數(shù)據(jù)采集 系統(tǒng)設(shè)計(jì) 畢業(yè)論文
上傳時(shí)間： 2014-12-26
上傳用戶：龍飛艇
PC與單片機(jī)數(shù)據(jù)采集系統(tǒng)的USB通訊設(shè)計(jì)論文
標(biāo)簽： USB 單片機(jī) 數(shù)據(jù)采集系統(tǒng) 通訊設(shè)計(jì)
上傳時(shí)間： 2013-10-30
上傳用戶：hanli8870
STC12C5A60S2系列ADC測試結(jié)果(使用12位DA測試--4096個(gè)測試點(diǎn))
上傳時(shí)間： 2013-11-23
上傳用戶：sc965382896
便攜式信號(hào)采集在機(jī)器健康診斷系統(tǒng)中有較高的應(yīng)用價(jià)值。機(jī)器健康診斷的信號(hào)特點(diǎn)是包括低頻信號(hào)。本文研究是為了實(shí)現(xiàn)簡易而且低成本的低頻便攜式信號(hào)采集。以Microchip公司單片機(jī)PIC18F1320為核心設(shè)計(jì)信號(hào)采集電路，實(shí)現(xiàn)了信號(hào)的采集和保存。系統(tǒng)采用串行電可擦除芯片24LC32A保存數(shù)據(jù)，經(jīng)過有線通信，信號(hào)數(shù)據(jù)由串行口通過MAX232芯片輸送到微型計(jì)算機(jī)接收和保存，最后繪制出信號(hào)波形。 微型計(jì)算機(jī)程序采用Visual Basic編程。研究成功采樣頻率為3 kHz的復(fù)雜信號(hào)，證明該方案符合設(shè)計(jì)要求。 Abstract: Portable signal acquisition is useful in machine health monitoring systems. The signal characteristics of machine health monitoring includes low frequency signals. The goal of this study is to realize simple, inexpensive and portable low frequency signal sampling. This paper provides the project of signal acquisition system design based on PIC18F1320 microcontroller manufactured by the Microchip Technology Incorporation to achieve signal sampling and storage. The system adopted EEPROM 24LC32A to store the signal data. The microcomputer received data via wired link with the MAX232 IC through the serial port. The microcomputer program, programmed in Visual Basic, received the data, stored it and plotted the signal. The study successfully samples 3kHz complicated signals and thus meets the design requirement.
上傳時(shí)間： 2013-11-19
上傳用戶：moerwang
以C8051F020為核心處理器，設(shè)計(jì)無線傳感器網(wǎng)絡(luò)數(shù)據(jù)采集系統(tǒng)。系統(tǒng)采用SZ05-ADV型無線通訊模塊組建Zigbee無線網(wǎng)絡(luò)，結(jié)合嵌入式系統(tǒng)的軟硬件技術(shù)，完成終端節(jié)點(diǎn)的8路傳感器信號(hào)的數(shù)據(jù)采集。現(xiàn)場8路信號(hào)通過前端處理后，分別送入C8051F020的12位A/D轉(zhuǎn)換器進(jìn)行轉(zhuǎn)換。經(jīng)過精確處理、存儲(chǔ)后的現(xiàn)場數(shù)據(jù)，通過Zigbee無線網(wǎng)絡(luò)傳送到上位機(jī)，系統(tǒng)可達(dá)到汽車試驗(yàn)中無線測試的目的。 Abstract: This paper designs a wireless sensor network system for data acquisition with C8051F020 as core processors.The system used SZ05-ADV wireless communication module，set up a Zigbee wireless network， combined with hardware and software technologies of embedded systems，completed the end-node 8-locale sensor signal data acquisition.Eight locale signals were sent separately into the 12-bit ADC of C8051F020 for conversion through front treatment.After accurate processing and storage，the locale data was transmitted to the host computer through Zigbee wireless.The system achieves the purpose of wireless testing in vehicle trial.
標(biāo)簽： C8051F020 Zigbee 汽車測試 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-11-23
上傳用戶：dsgkjgkjg
為提高溫度測量效率，降低系統(tǒng)的成本，擴(kuò)展傳輸距離，設(shè)計(jì)出一種新型溫度采集系統(tǒng)。單片機(jī)通過控制具有單總線方式的溫度傳感器DS18B20實(shí)現(xiàn)對溫度的測量，同時(shí)單片機(jī)通過控制具有單總線方式300～450MHz頻率范圍內(nèi)的MAX7044與MAX7033無線發(fā)射與接收芯片實(shí)現(xiàn)溫度數(shù)據(jù)的無線傳輸。與傳統(tǒng)溫度采集系統(tǒng)相比，該系統(tǒng)利用單總線方式連接，采用無線傳輸方式實(shí)現(xiàn)遠(yuǎn)距離通信，易于系統(tǒng)的集成與擴(kuò)展。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)結(jié)構(gòu)簡單、方便移植，能夠同時(shí)實(shí)現(xiàn)多達(dá)上百點(diǎn)溫度的測量與500m范圍的傳輸。 Abstract: To improve the temperature measurement efficiency and reduce system cost,expansion of transmission distance,a new type of temperature acquisition system is designed.Microcontroller controlled temperature sensor DS18B20which has a single-bus achieves temperature measurement,while microcontroller by controlled the MAX7044and MAX7033chip with a single-bus and having300~450MHz radiofrequency to achieve the wireless transmission of temperature data.Compared with conventional temperature acquisition system,the system uses single-bus connected,and uses wireless transmission means to achieve long-distance communications,easy-to-system integration and expansion.The experimental results show that the system is simple,convenient transplantation,and can be implemented in as many as a hundred-point temperature measure-ment and the transmission range of500meters.
標(biāo)簽： 單總線 無線溫度 采集 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-10-29
上傳用戶：515414293
介紹基于ISA總線與KH-9300的數(shù)據(jù)采集板卡的設(shè)置，詳細(xì)說明8254定時(shí)計(jì)數(shù)器及8259中斷控制器的結(jié)構(gòu)特點(diǎn)、工作方式、控制字等，探討中斷類型、中斷處理程序、中斷矢量表及其填寫。重點(diǎn)講述使用TorboC編寫中斷服務(wù)程序的方法，應(yīng)注意的主要問題及程序測試的結(jié)果。 Abstract: The settings of KH-9300 data acquisition board based on the ISA bus is introduced,the structural characteristics,working methods,control characters of the timing counter 8254 and interruptioncontroller 8259 are explained in detail.The interruption type,interrupt handling programs,interruption vector table and its filling also are discussed.Further,great emphasis is put on the method of interrupt service program compiled by Torbo C,the main issues that should be noted,and the results of program testing.
上傳時(shí)間： 2013-11-14
上傳用戶：qq527891923
介紹一種基于C8051F060單片機(jī)和NAND Flash的數(shù)據(jù)采集存儲(chǔ)系統(tǒng)，該系統(tǒng)可實(shí)現(xiàn)3路信號(hào)采樣，每路采樣率為5KS/s,通過異步串行通信接口實(shí)現(xiàn)數(shù)據(jù)傳輸。并詳細(xì)說明系統(tǒng)的軟件設(shè)計(jì)。 Abstract: An acquisition and storage system based on C8051F060and NAND Flash is designed in this paper.The system is used to sample three-channel of signal,5KSPS each channel,and can upload data to test bench through UART（Universal Asynchronous Receiver/Transmitter）.The software design is discussed in detail.
標(biāo)簽： C8051F060 數(shù)據(jù)采集 存儲(chǔ)系統(tǒng)
上傳時(shí)間： 2013-10-12
上傳用戶：Jesse_嘉偉
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