介紹了一種基于C8051F020單片機的多路壓力測量儀。該測量儀選用電阻應變式壓力傳感器采集壓力信號,并經放大電路處理后送入C8051F020單片機,再由C8051F020單片機內部的A/D轉換器將采集到的壓力信號進行模數轉化,然后分別對數據進行存儲和顯示。該測量儀能測量6路壓力信號,并且各測量點都能單獨檢測和設置。由于采用了C8051F020單片機,簡化了硬件電路,增強了抗干擾能力,使得測量儀具有測量精度高,沖擊小等特點。 Abstract: A measurement apparatus for multi-channel pressure based on single chip microcomputer is introduced.It can measure 6 channels signal of the pressure,and the pressure measure points can be detection and located individually.The pressure signal sampling is obtained by resistor stress-type pressure sensors,the digital signals of 6 channels are collected through amplifying and adjustment circuit of pressure signals and internal integrated A/D converter of MCU.Finally,and it realizes the function to store and display data separately.C8051F020 was used to made hardware circuit simple,and it also enhanced the anti-interference ability.It features high precision and little impact.
上傳時間: 2013-11-16
上傳用戶:yare
TLC1543是TI公司推出的采用SPI技術的模數轉換器。具有輸入通道多、高速、高分辨率、性價比高、易于和單片機接口等特點,在各種數據采集系統中有著廣闊的應用空間。51單片機、TLC1543加上很少的外圍器件即可構成一個高性價比的數據采集系統,同時TLC1543占用單片機I/O資源較少,使得單片機有足夠的I/O資源去完成如控制、顯示等功能。由AT89C52和TLC1543構成的三相單獨可調400Hz中頻電源的數據采集系統在實際運用中達到很好的效果。
上傳時間: 2013-11-17
上傳用戶:xg262122
為了解決磁放大器性能測試過程中,需要對其供給不同數值恒定電流的問題,設計了一種基于DAC7512和單片機的數控恒流源系統。該系統采用AT89C51作為主控器件,將計算機發送的電流控制字命令轉換為D/A轉換器控制字,通過模擬SPI通信接口,寫D/A控制字到DAC7512,從而控制其輸出相應數字電壓值,經差動縮放電路、電壓/電路變換電路和功率驅動電路,最后輸出恒定電流。實驗結果表明,恒流源輸出電流調節范圍為-45~+45 mA、精度為±0.1 mA,分辨率達0.024 4 mA,具有應用靈活,外圍電路簡單,可靠性高的特點。該數控直流恒流源也可為相關產品的測試系統研發提供參考。 Abstract: In order to solve the need to supply different values constant current for the magnetic amplifier in testing process, numerical control constant current source system was designed based on DAC7512 chip and microcontroller technology. The system used the AT89C51 as the main chip, which can convert the current control word from computer into to D/A control words. And the system wrote D/A control word into the DAC7512 chip to control the output voltage value by the SPI communication interface, which can output corresponding constant current figures by scaling circuit, the V/I converter and power drive circuit. Experimental results show that the current source output current adjustment range is -45~+45mA, accuracy is ± 0.1mA, and resolution ratio is 0.024 4mA
上傳時間: 2014-12-27
上傳用戶:invtnewer
主要介紹構成記憶示波器的STC12C5408AD增強型單片機8通道10位模數轉換功能的設置、應用和具體的匯編程序設計,以及PC機串行通訊和圖形顯示的高速匯編程序的設計要點,并列舉實例說明其應用效果。 Abstract: The configuration, applications and the designs for? compiling program of the memorial oscillograph of 10 bits A/D conversation are introduced. It’s bases on STC12C5408AD 8? channels? single-chip? computer? in? enhancement? mode. It also recommends the devising essentials of high speed compiling program for PC serial communication and graphics display, lists examples to explain its effects in using.
上傳時間: 2013-10-10
上傳用戶:adada
詳細介紹了TLC1549系列模數轉換器的特點及工作原理,然后根據TLC1549的工作時序和A/D轉換原理針對實際問題編寫了詳細的匯編語言程序。 Abstract: A basic principle and characteristic of TLC1549 analog-to-digital converter are introduced? detailedly in this article.Through engineering-oriented illustration,a microcomputer programmer base on basic principle and time sequence of TLC1549 is writted.
上傳時間: 2014-07-16
上傳用戶:blans
基于幅移鍵控技術ASK(Amplitude-Shift Keying),以C8051F340單片機作為監測終端控制器,C8051F330D單片機作為探測節點控制器,采用半雙工的通信方式,通過監控終端和探測節點的無線收發電路,實現數據的雙向無線傳輸。收發電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線,天線直徑為(3.4±0.3)cm。試驗表明,探測節點與監測終端的通信距離為24 cm,通過橋接方式,節點收發功率為102 mW時,節點間的通信距離可達20 cm。與傳統無線收發模塊相比,該無線收發電路在受體積、功耗、成本限制的場合有廣闊的應用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller, using half-duplex communication mode, this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter (3.4±0.3) cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm,the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules, the circuit has wide application prospect in small size, low cost and low power consumption and other characteristics.
上傳時間: 2013-10-19
上傳用戶:xz85592677
鐘是現代人類日常生活必不可少的工具,語音時鐘更是現在電子時鐘多功能化發展的一個方向。語音電子鐘具有突出的播報時間的功能,它被廣泛用在生活中的各種場合。本設計就是從日常生活中常見的事物入手,通過對語音電子鐘的設計,讓我認識到單片機已經深入到我們生活的每個領域。 本文從語音電子鐘的設計原理、設計方案入手,詳細介紹了系統硬件設計、軟件設計及調試。在語音電子鐘的設計中,要處理好以下幾個關鍵:D/A(數/模)轉換,語音識別,人機接口,程序設計。D/A(數/模)和語音識別技術關系到時間的正確播報,人機接口是播報時間和調整時間的關鍵。利用凌陽SPCE061A單片機在語音識別和處理方面的優點,結合實踐,設計出有特色的語音電子鐘。
上傳時間: 2013-10-30
上傳用戶:feitian920
力源可提供ON、TI、ST、Freescale和Chipswinner公司的優質功率器件,包括MOSFET驅動器、外設起動器/驅動器、功率邏輯、電機控制器、功率因子控制器、達林頓晶體管整列、鉗位電路和虛地發生器等。
標簽: 功率器件
上傳時間: 2014-12-27
上傳用戶:zfyiaaa
特性1、8位高性能單片機作為主控制芯片,64K程序存儲器,也可以用來保存數據,斷電數據不丟失;2、工作電源:交直流通用,12V交流電或12V直流電均可,標準功率為10W;3、16路光電隔離數字量輸入,NPN輸入形式,每路輸入點的最大輸入電壓:30V,最大輸入電流:10mA;其中有兩路可作中斷源用于計數;4、12路繼電器隔離輸出,最大輸出電壓為220V,最大輸出電流為5A,輸出口狀態可回讀;5、系統采用光電隔離和啟用內部看門狗及嚴格的高頻濾除特性,使系統工作穩定可靠,無死機現象;是工業級高可靠單片機控制器;6、有兩盞LED燈顯示工作狀態,LED燈和撥碼開關是復用的,也可用來設置兩個參數;7、有1路標準的RS232串行通信接口(抗15KV靜電沖擊),可直接與電腦通信;可通過RS232接口與JMDM系列單片機控制器擴展I/O點,如JMDM-10AIO10DIO、JMDM-2011、JMDM-1830等。8、可直接通過RS232接口下載程序,無需燒錄器,方便程序修改、升級;9、緊湊型(適合任何尺寸的機箱),PCB尺寸:155mm*110mm;安裝孔尺寸:148mm*73mm;10、用KeilC或匯編編程,用戶編程有困難的,可把工藝流程發給我司,我們公司可代為編程。
上傳時間: 2013-10-15
上傳用戶:lbbyxmoran
常用主板I/O芯片簡介
上傳時間: 2013-11-10
上傳用戶:yupw24