開題報告基于單片機的無線搶答器-全文預覽
【正文】 edback will send to the control section. This system uses LED to display the received feedback from twoway munication to make the system more stable.AT89S52 MCU will send the control information system detected to LED display by the decoding circuit IOA port. Through the MCU CS, WR, RD interface state judge bit choice sent to the IOB port to control a group of l LED dot matrix display show. Cycle refresh, the afterglow of LED lights, and the persistence of vision effect, a visual stable state can be obtained. LED display circuit was shown in Figure 2. IV. SOFTWARE DESIGN As shown in Figure 3, the software is designed with a modular structure, mainly by the main program, subroutine of sending data, timed subroutine, interrupt service routines, etc. The master control program control wireless realtime munication through the nRF2401 module. The wireless transceiver nRF24E1 has a 144Bit configuration word, the configuration word regulates receiver address, transceiver frequency, transmit power, the rate of wireless transmission, wireless transceiver mode, the length of the CRC checksum, and the length of valid data. Wireless data packet format of the nRF2401 munication protocols is as FollowsThis paper design a kind of control system of LED display through nRF24E1 wireless munications module. That greatly enhanced the stability and reliability of the wireless control system。關鍵詞：單芯片無線控制，發(fā)光DIOD，無線控制模塊。這種控制系統(tǒng)消除了控制器和LED顯示的電氣連接。無線傳輸模塊包括一個由無線收發(fā)芯片nRF24E1無線收發(fā)芯片和增強型8051單片機。它可以用來改變頻率和跳頻避免干擾。DIN0只能用于輸入，其余都是雙向引腳，和重用。 本系統(tǒng)主要包括兩部分：控制部分和接收部分。本系統(tǒng)采用LED顯示接收到的反饋的雙向溝通，使系統(tǒng)更加穩(wěn)定。LED顯示電路如圖2所示。本文設計了一種LED顯示屏控制系統(tǒng)，通過nRF24E1的無線通信模塊。五、指導老師意見：。提高了LED顯示屏的控制效率。無線收發(fā)芯片nRF24E1具有144bit配置字，配置字調(diào)節(jié)接收器地址，收發(fā)頻率，發(fā)射功率，無線傳輸速率，無線收發(fā)器的方式，CRC校驗碼的長度，以及有效數(shù)據(jù)的長度。通過單片機的CS，WR，RD接口狀態(tài)判斷點選擇發(fā)送到IOB口控制一組LED點陣顯示屏顯示L?？刂撇糠值腁T89S52單片機將驅(qū)動基于所接收的控制命令，LED顯示。上電工作后，在引導程序的控制下電路發(fā)送存儲在EEPROM存儲in512brom對nRF24E1 4kbram程序運行空間通過SPI口完成控制任務切換到用戶程序和用戶程序?qū)崿F(xiàn)通信。在nRF24E1，以其體積小，功耗低，內(nèi)部FIFO可以連接各種高、低速度的微處理器，易于使用，低成本的單芯片微控制器，使低成本的開發(fā)利用更方便。of90dbm，與電壓調(diào)節(jié)器內(nèi)， [ 3 ]。接收模塊接收指令，并且將其發(fā)送到單芯片微控制器，其中，該指令進行處理，然后驅(qū)動電路在無線控制LED顯示。近年來，LED顯示被廣泛應用于公共場所進行公示，因為它的優(yōu)勢在大屏幕，超視覺，低功耗，高亮度，壽命長，柔性顯示[12]，簡單實用的控制系統(tǒng)，正吸引著越來越多的關注。本系統(tǒng)控制的發(fā)光二極管（LED）由AT89S52單片機的無線顯示（MCU）基于傳輸模塊nRF24E1。四、參考文獻：[1] .[M]北京人民郵電出版社2004[2] .[M]北京高等教育出版社 2004 [3]. 董曉紅單片機原理及接口技術(shù).[M]西安電子科技大學出版社 2004
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