指針式與數(shù)字式萬用表的優(yōu)缺點(diǎn)
上傳時(shí)間: 2013-11-14
上傳用戶:packlj
89c51單片改造傳統(tǒng)接觸器式自動(dòng)控制的小型注塑機(jī)程序
標(biāo)簽: 89c51 接觸器 自動(dòng)控制 注塑機(jī)
上傳時(shí)間: 2013-10-16
上傳用戶:小楓殘?jiān)?/p>
首先研究CAN總線和SAE J1939協(xié)議,提出一種基于MC9S12HZ256微控制器的總線式汽車數(shù)字儀表解決方案。詳細(xì)介紹SAE J1939協(xié)議的報(bào)文幀格式及應(yīng)用層協(xié)議中發(fā)動(dòng)機(jī)相關(guān)參數(shù)的定義,以及步進(jìn)電機(jī)及其驅(qū)動(dòng)和車速信號(hào)的處理方法。該數(shù)字儀表系統(tǒng)硬件平臺(tái)由微處理器和信號(hào)采集和信息處理及顯示等模塊組成。軟件設(shè)計(jì)部分編程實(shí)現(xiàn)了對(duì)CAN總線和各傳感器數(shù)據(jù)的讀取、處理。該系統(tǒng)能夠?qū)崟r(shí)反映車輛工況。 Abstract: In this paper,CAN bus and SAE J1939protocol are researched,and a vehicle digital instrument solution based on MC9S12HZ256MCU is proposed.The message frame format and some engine-related parameters’definition in SAE J1939application layer protocol are introduced in detail.Stepper motor and its driver,the methods of speed signal process-ing are also introduced.The hardware platform of vehicle digital instrument is composed by MCU,signal acquisition mod-ule,and signal processing and displaying module.Data receiving and processing from CAN bus and sensors are accom-plished by programming,and vehicle condition can be reflected in real-time.
上傳時(shí)間: 2013-10-20
上傳用戶:huannan88
摘要:本文介紹應(yīng)用PIC16C57單片機(jī)設(shè)計(jì)的一種可編程、高性能的數(shù)碼式樓宇對(duì)講系統(tǒng),詳細(xì)闡明了有關(guān)工作原理和關(guān)鍵技術(shù)。本系統(tǒng)充分應(yīng)用PIC單片機(jī)的軟硬件資源,具有可編程、電路簡(jiǎn)單、功能強(qiáng)大等優(yōu)點(diǎn),在安居工程、樓宇技防系統(tǒng)等領(lǐng)域具有廣泛的應(yīng)用前景。 關(guān)鍵詞:PIC 單片機(jī) 樓宇對(duì)講 編碼 譯碼 可編程
標(biāo)簽: PIC 單片機(jī) 中的應(yīng)用 可編程
上傳時(shí)間: 2013-11-14
上傳用戶:hj_18
針對(duì)材料試驗(yàn)機(jī)等設(shè)備中要求測(cè)量或控制材料拉伸或壓縮的位移,一般采用光電軸角編碼器檢測(cè)位置信號(hào),輸出正交編碼脈沖信號(hào)。若采用其他方法檢測(cè)位置信號(hào),必然導(dǎo)致電路設(shè)計(jì)復(fù)雜,可靠性降低。因此,提出一種基于LS7266R1的電子式萬能材料試驗(yàn)機(jī)設(shè)計(jì)方案。給出了試驗(yàn)機(jī)中的控制器工作原理,LS7266R1與單片機(jī)的接口硬件設(shè)計(jì),以及主程序軟件流程圖。巧妙地把力量傳感器,位移傳感器等機(jī)械運(yùn)動(dòng)狀態(tài)的壓力或拉力以及位置坐標(biāo),變成了電壓信號(hào)和電脈沖數(shù)字信號(hào),供A/D測(cè)量和LS7266R1計(jì)數(shù),從而實(shí)現(xiàn)了獨(dú)立完成材料試驗(yàn)控制或通過PC機(jī)串口命令完成材料試驗(yàn)控制。 Abstract: Aiming at the requirement that the displacement of the tension and compression always be tested and controlled in the equipement such as material testing machine. The position signal was tested by photoelectric axial angle coder. Therefore, the paper proposes the design of electronic universal testing machine design based on LS7266R1. If the position signal detected by other methods, will inevitably lead to the circuit design complexity, reliability decreased. The work theory of the controller, the hardware interface design between LS7266R1 and single chip, and the flow chart of main program, are presented in this paper. The signal of the compression or tension power and displacement at working, which tested by power sensor and displacement sensor especially, is changed into electric voltage and electric pulse numerical signals. And these signals can be tested by A/D and counted by LS7266R1. Finally the test of the material properties can be controlled by itself, or controlled by the COM command of PC.
上傳時(shí)間: 2013-11-02
上傳用戶:yl1140vista
設(shè)計(jì)實(shí)現(xiàn)了一種基于MSP430系列超低功耗單片機(jī)的新型高精度自控式骨矯形器,介紹了系統(tǒng)的總體設(shè)計(jì)及硬件軟件設(shè)計(jì)。試驗(yàn)表明,該骨矯形器可實(shí)現(xiàn)自控內(nèi)固定、牽張、回縮及加壓固定功能,且功耗低、操控簡(jiǎn)單、控制精度高、安全可靠。
上傳時(shí)間: 2013-10-16
上傳用戶:1427796291
介紹了一款可以同時(shí)讀寫接觸式卡和非接觸式卡的多功能讀卡器,詳細(xì)闡述了射頻芯片PN532和主控芯片ST2211的外圍硬件電路和整個(gè)讀卡器的軟件構(gòu)架。同時(shí)對(duì)讀卡器電源管理、低功耗設(shè)計(jì)、多通信方式融合等進(jìn)行了較詳細(xì)的分析
上傳時(shí)間: 2013-10-23
上傳用戶:chongchongsunnan
摘要:研究了用單片機(jī)控制的單相后備式方波輸出UPS的控制技術(shù)及實(shí)現(xiàn),分析了系統(tǒng)的工作原理,給出了硬件實(shí)現(xiàn)電路和算法框圖,并測(cè)出了市電逆變相互轉(zhuǎn)換等主要實(shí)驗(yàn)結(jié)果。關(guān)鍵詞:不間斷電源;單片機(jī);推挽變換器
上傳時(shí)間: 2013-10-28
上傳用戶:1051290259
摘要:本文針對(duì)單片機(jī)課程在高職院校中普遍存在上課難的問題,提出以實(shí)踐為主,采用實(shí)驗(yàn)任務(wù)指派,教師在課堂中啟發(fā)式的教學(xué)方法。教學(xué)實(shí)踐證明這種方法起到了積極的推動(dòng)作用,學(xué)生能夠從中掌握實(shí)用技能,為日后就業(yè)打下堅(jiān)實(shí)基礎(chǔ)。關(guān)鍵詞:任務(wù)式;啟發(fā)式;教學(xué)改革
標(biāo)簽: 單片機(jī) 啟發(fā)式 教學(xué)改革
上傳時(shí)間: 2013-11-30
上傳用戶:oooool
本文介紹一種基于C8051F021片上系統(tǒng)的電容式變送器的設(shè)計(jì)方法,對(duì)恒流充電法測(cè)量電容量的原理進(jìn)行了詳細(xì)的分析,設(shè)計(jì)的電容式變送器輸入信號(hào)范圍可以通過軟件設(shè)置,輸出為標(biāo)準(zhǔn)的4~20mA電流信號(hào),能夠和標(biāo)準(zhǔn)信號(hào)的工業(yè)儀表或計(jì)算機(jī)測(cè)控系統(tǒng)直接接口,并支持MODBUS協(xié)議的RS485現(xiàn)場(chǎng)總線通信。
標(biāo)簽: C8051F021 片上系統(tǒng) 電容式 送器設(shè)計(jì)
上傳時(shí)間: 2013-12-27
上傳用戶:asddsd
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