本文關(guān)鍵詞：低功耗便攜式RFID閱讀器的軟硬件設(shè)計(jì)與實(shí)現(xiàn)　出處：《北方工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 射頻識(shí)別 ISO14443 低功耗閱讀器

【摘要】：射頻識(shí)別技術(shù)(Radio Frequency Identification,簡(jiǎn)稱RFID),作為物聯(lián)網(wǎng)建設(shè)關(guān)鍵的一環(huán),起著信息采集和獲取的作用,被廣泛應(yīng)用于交通、城市生活、醫(yī)療、物流等領(lǐng)域。射頻識(shí)別技術(shù)有很多不同的協(xié)議標(biāo)準(zhǔn),不同的協(xié)議所使用的環(huán)境也不同,但都主要包括了兩個(gè)部分：RFID閱讀器和電子標(biāo)簽。閱讀器通過無線感應(yīng)的方式和電子標(biāo)簽進(jìn)行通信,將電子標(biāo)簽中的信息讀取出來或把信息寫入電子標(biāo)簽。 本課題完成的是13.56MHz下近距離RFID閱讀器的軟硬件設(shè)計(jì),設(shè)計(jì)的重點(diǎn)是閱讀器整體的低功耗和便攜性,以使閱讀器應(yīng)用在無電源供電的環(huán)境中。本文首先介紹了國(guó)內(nèi)外RFID系統(tǒng)的發(fā)展現(xiàn)狀和目前RFID技術(shù)發(fā)展所面臨的問題,然后通過對(duì)RFID技術(shù)所涉及的理論進(jìn)行分析,明確了RFID閱讀器天線設(shè)計(jì)的重點(diǎn),進(jìn)而進(jìn)行了便攜式RFID閱讀器的整體設(shè)計(jì),從結(jié)構(gòu)上把閱讀器劃分為控制顯示部分和高頻部分。 數(shù)字控制部分主要包括MCU控制模塊、電源模塊、顯示模塊和USB通信模塊。MCU采用TI公司的MSP430芯片實(shí)現(xiàn)MCU控制單元的功能,電源模塊采用鋰亞電池和太陽能雙供電的模式,增加了閱讀器的續(xù)航能力。顯示模塊使用低功耗QLED顯示屏,將Mifare卡上采集到的信息顯示出來。 高頻模塊由13.56MHz高頻收發(fā)單元和相應(yīng)的匹配電路組成。高頻芯片采用非接觸式讀寫卡芯片RC522,天線采用直接匹配電路的方式,通過設(shè)計(jì)天線匹配電路使高頻發(fā)射部分的諧振達(dá)到13.56MHz。 軟件部分按照國(guó)際近耦合IC卡標(biāo)準(zhǔn)ISO14443協(xié)議編寫RC522讀寫卡代碼,具體代碼模塊設(shè)計(jì)包括了系統(tǒng)初始化、RC522初始化、尋卡、防沖突、選卡、認(rèn)證,然后對(duì)卡進(jìn)行讀寫操作,最后終止程序,最終結(jié)合閱讀器硬件完成讀卡將結(jié)果顯示在顯示屏上。 本課題制作了閱讀器的PCB板,進(jìn)行了電路測(cè)試,在CCS集成環(huán)境下將軟件下載到PCB板,進(jìn)行閱讀器的在線調(diào)試,經(jīng)過軟件的調(diào)試,OBU能夠正確的讀卡,并能將結(jié)果顯示在顯示屏上。
[Abstract]:Radio Frequency Identification (RFID) is a key link in the construction of Internet of things. It is widely used in transportation, city life, medical treatment, logistics and other fields. RFID technology has many different protocol standards, different protocols used in different environments. But they mainly include two parts: RFID reader and electronic tag. The reader communicates with electronic tag through wireless sensor. To read or write information from an electronic tag. In this paper, the hardware and software design of the close range RFID reader at 13.56MHz is completed. The emphasis of the design is the low power consumption and portability of the reader as a whole. In order to make the reader applied in the environment without power supply, this paper first introduces the development status of RFID system at home and abroad and the problems faced by the development of RFID technology. Then through the analysis of the theory of RFID technology, the emphasis of antenna design of RFID reader is defined, and then the overall design of portable RFID reader is carried out. The reader is divided into control display section and high frequency part from the structure. Digital control part mainly includes MCU control module, power module, display module and USB communication module. MCU uses TI's MSP430 chip to realize the function of MCU control unit. The power module uses lithium sub-battery and solar dual power mode to increase the reader's ability to live. The display module uses low-power QLED display. Display the information collected on the Mifare card. The high frequency module is composed of 13.56MHz high frequency transceiver unit and corresponding matching circuit. The high frequency chip adopts the non-contact read-write card chip RC522, and the antenna adopts the way of direct matching circuit. By designing the antenna matching circuit, the resonance of the high frequency transmitting part can reach 13.56 MHz. In the software part, the code of RC522 read-write card is written according to the standard ISO14443 protocol of the international near-coupling IC card. The specific code module design includes the initialization of RC522 and the searching of the card. Anti-collision, card selection, authentication, and then read and write to the card, the final termination of the program, finally combined with reader hardware to complete the card reading results will be displayed on the display screen. In this paper, the PCB board of the reader is made, the circuit is tested, the software is downloaded to the PCB board under the CCS integrated environment, and the reader is debugged online, after the debugging of the software. The OBU can read the card correctly and display the results on the screen.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TP391.44

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