This application report discusses the design of non-invasive optical plethysmographyalso called as pulsoximeter using the MSP430FG437 Microcontroller (MCU). Thepulsoximeter consists of a peripheral probe combined with the MCU displaying theoxygen saturation and pulse rate on a LCD glass. The same sensor is used for bothheart-rate detection and pulsoximetering in this application. The probe is placed on aperipheral point of the body such as a finger tip, ear lobe or the nose. The probeincludes two light emitting diodes (LEDs), one in the visible red spectrum (660nm) andthe other in the infrared spectrum (940nm). The percentage of oxygen in the body isworked by measuring the intensity from each frequency of light after it transmitsthrough the body and then calculating the ratio between these two intensities.
標(biāo)簽: Pulsoximeter Single-Chip Des
上傳時(shí)間: 2013-10-27
上傳用戶:黑漆漆
DAC0832是一個(gè)8位D/A轉(zhuǎn)換器芯片,單電源供電,從+5V~+15V均可正常工作,基準(zhǔn)電壓的范圍為±10V,電流建立時(shí)間為1μs,CMOS工藝,低功耗20mW。其內(nèi)部結(jié)構(gòu)如圖9.1所示,它由1個(gè)8位輸入寄存器、1個(gè)8位DAC寄存器和1個(gè)8位D/A轉(zhuǎn)換器組成和引腳排列如圖1所示。 • DAC0832工作方式• ADC0809工作方式要求掌握:• MCS-51單片機(jī)與D/A轉(zhuǎn)換器的接口連接• MCS-51單片機(jī)與A/D轉(zhuǎn)換器的接口連接• 初始化編程及應(yīng)用了解:• 典型D/A轉(zhuǎn)換器芯片DAC0832的管腳功能• 典型A/D轉(zhuǎn)換器芯片ADC0809的管腳功能
標(biāo)簽: MCS 51 單片機(jī) 轉(zhuǎn)換器
上傳時(shí)間: 2014-01-14
上傳用戶:zl520l
本文針對(duì)在蘋果園中監(jiān)測(cè)測(cè)量控制等系統(tǒng)中無法方便的把數(shù)據(jù)傳輸給移動(dòng)設(shè)備的情況,在此介紹了一種以USB接口芯片沁恒CH375和MCS51單片機(jī)為核心,U盤、移動(dòng)硬盤等為存儲(chǔ)介質(zhì)的數(shù)據(jù)存儲(chǔ)方案。本模塊給出了硬件電路的設(shè)計(jì)和U盤的讀寫程序,并指出了易出錯(cuò)的調(diào)試細(xì)節(jié)。實(shí)驗(yàn)結(jié)果證明,該方法具有成本低,可靠性高,通用性強(qiáng),可以簡(jiǎn)便地集成到各種監(jiān)測(cè)、測(cè)控系統(tǒng)中。
標(biāo)簽: 375 USB CH 數(shù)據(jù)傳輸
上傳時(shí)間: 2013-10-16
上傳用戶:zhqzal1014
51單片機(jī)擴(kuò)展USB接口的方法 討論了在P89C51RD 單片機(jī)上擴(kuò)展USB 接口的方法. 介紹了USB 的相關(guān)技術(shù)標(biāo)準(zhǔn). 詳細(xì)描述了P89C51RD 單片機(jī)與USBN9603 的接口原理,給出了硬件原理圖并介紹了固件程序與設(shè)備驅(qū)動(dòng)程序軟件的編制過程. 廉價(jià)的51 單片機(jī)具備了USB 接口,其應(yīng)用范圍將更加廣泛.
標(biāo)簽: USB 51單片機(jī) 擴(kuò)展 接口
上傳時(shí)間: 2014-01-16
上傳用戶:alibabamama
STM32F10xxx USB開發(fā)工具包
上傳時(shí)間: 2013-10-23
上傳用戶:qunquan
usb調(diào)試助手:推薦的工具。
標(biāo)簽: usb 調(diào)試助手
上傳時(shí)間: 2013-11-07
上傳用戶:lyy1234
ADC0809是帶有8位A/D轉(zhuǎn)換器、8路多路開關(guān)以及微處理機(jī)兼容的控制邏輯的CMOS組件。它是逐次逼近式A/D轉(zhuǎn)換器,可以和單片機(jī)直接接口。 adc0809 datasheet
標(biāo)簽: 0809 ADC 轉(zhuǎn)換器 應(yīng)用技術(shù)
上傳時(shí)間: 2013-10-11
上傳用戶:kz_zank
本文設(shè)計(jì)一種以C8051F020 單片機(jī)為處理器,雙模式USB 為接口的比色計(jì)儀器。該儀器可以工作在USB 設(shè)備和主機(jī)兩種模式。在設(shè)備模式下,能直接與計(jì)算機(jī)進(jìn)行數(shù)據(jù)通信;在主機(jī)模式下,能讀寫U盤,通過U 盤進(jìn)行數(shù)據(jù)的傳輸。儀器采用雙USB 插座,由單片機(jī)判斷確定設(shè)備的工作方式。
上傳時(shí)間: 2013-11-01
上傳用戶:ZZJ886
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
1、 支持USB 1.1通訊協(xié)議;2、 支持高速(Full Speed、12Mbps )和低速(Low Speed、1.5Mbps )傳輸;3、 6MHz晶體,鎖相環(huán)PLL振蕩器提供高速、低速所需時(shí)鐘源;4、 支持3個(gè)端口(endpoint),可獨(dú)立編程為IN 或 OUT端口。5、 PS/2:支持PS/2協(xié)議(eg.鼠標(biāo)),與USB復(fù)用。
上傳時(shí)間: 2013-11-03
上傳用戶:hbsunhui
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