針對眾多低成本數據采集需求，采用帶有片上USB控制器和D/A轉換器的混合信號微處理器C8051F340，設計了一款可通過USB接口和LabVIEW圖形用戶界面實現與PC機聯機的數據采集器，同時借助系統的SD卡存儲獨立實現現場長時間采集數據。該數據采集器成本低，結構簡單，體積小，已成功用于工業現場。 Abstract: Aiming at the need of low cost data acquisition, a data acquisition device is designed based on C8051F340 which is a mixed-signal microcontroller and integrates USB controller and A/D controller on a chip.The data acquisition device which can combine with PC by USB interface and LabVIEW graphical user interface,can realize data acquisition. At the same time,it can be solely run a long time in virtue of SD card in field.The date aequisition device features low cost,simple structure and little sharp, and it has been used in industry field.
上傳時間： 2014-05-31
上傳用戶：1109003457
針對51單片機系統中常用的A/D轉換器價格高、精度低的缺點，介紹TI公司的16 位的帶有I2C串行接口的A/D轉換器ADS1110的工作原理，給出ADS1110與AT89C51單片機系統的接口電路和軟件設計。實踐證明，ADS1110具有高性價比和實用性。 Abstract: According to the disadvantages of high expense and low accuracy of the general A/D converter used in MCS51 microchip system,the principle and working process of a high accuracy 16-bit A/D conversion ADS1110 which has I2C bus and belongs to TI Company are proposed here as well as the interface of ADS1110 to AT89C51 and software list.It is proved to be high performance index and practicability.
上傳時間： 2013-11-21
上傳用戶：gyq
針對材料試驗機等設備中要求測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位置信號，輸出正交編碼脈沖信號。若采用其他方法檢測位置信號，必然導致電路設計復雜，可靠性降低。因此，提出一種基于LS7266R1的電子式萬能材料試驗機設計方案。給出了試驗機中的控制器工作原理，LS7266R1與單片機的接口硬件設計，以及主程序軟件流程圖。巧妙地把力量傳感器，位移傳感器等機械運動狀態的壓力或拉力以及位置坐標，變成了電壓信號和電脈沖數字信號，供A/D測量和LS7266R1計數，從而實現了獨立完成材料試驗控制或通過PC機串口命令完成材料試驗控制。 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.
上傳時間： 2013-11-02
上傳用戶：yl1140vista
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
利用Atmel公司的ATmega168微處理器，采用A/D轉換方式來實現按摩椅控制器的鍵盤接口，通過在硬件電路中巧妙地選擇電阻，在軟件設計中采用數字濾波、二分法和區間鑒定等方法，靈敏可靠地實現了按摩椅中30個按鍵的處理。給出了硬件電路設計和軟件設計思想以及部分匯編代碼。 Abstract: This paper chooses A/D conversion method to realize the keyboard interface of the controller by using ATmega168 microchip from Atmel Company.It accomplishes 30-key dealing sensitively and reliably in massage chair through skillfully selecting resistors in hardware circuit and using digital filter,dichotomy and area-judging method in software design.The hardware design circuit, software design idea and partly assembles code are presented mainly.
上傳時間： 2014-01-10
上傳用戶：咔樂塢
技術相關信息 技術相關信息 技術相關信息 技術相關信息 · 工具信息 · FAQs · 應用范例 − HA0003S HT48 & HT46 MCU 與HT93LC46 EEPROM 的通信 − HA0004S HT48 & HT46 MCU UART 的軟件實現方法 − HA0084S HT46R52 之應用－鎳氫電池充電器展示板
上傳時間： 2014-12-27
上傳用戶：hanli8870
摘要:鍵盤擔負著向系統發出命令和查詢系統工作狀態的重任。由于各種單片機所提供的片內外資源不同,所以在進行鍵盤擴展時其硬件電路的形式也多種多樣。文中介紹了利用單片機內部的A/D轉換通道、并行口以及片外擴展芯片等方法擴展鍵盤的硬件電路及電路工作原理,并給出了部分程序。關鍵詞:單片機;鍵盤;A/D轉換;并行口;串行口
上傳時間： 2013-11-15
上傳用戶：kang1923
ICI7135是4位雙積分A/D轉換芯片,可以轉換輸出±20000個數字量,有STB選通控制的BCD碼輸出,與微機接口十分方便.ICL7135具有精度高(相當于14位A/D轉換),價格低的優點.其轉換速度與時鐘頻率相關,每個轉換周期均有:自校準(調零),正向積分(被測模擬電壓積分),反向積分(基準電壓積分)和過零檢測四個階段組成,其中自校準時間為10001個脈沖,正向積分時間為10000個脈沖,反向積分直至電壓到零為止(最大不超過20001個脈沖).故設計者可以采用從正向積分開始計數脈沖個數,到反向積分為零時停止計數.將計數的脈沖個數減10000,即得到對應的模擬量.圖1給出了ICL7135時序,由圖可見,當BUSY變高時開始正向積分,反向積分到零時BUSY變低,所以BUSY可以用于控制計數器的啟動/停止.
上傳時間： 2013-11-02
上傳用戶：hebanlian
摘要：本系統采用雙單片機和E2PROM共享數據的方式實現通訊，通過下位機采集數據，上位機處理數據實現現場的遠距離數據采集。實驗證明該方式有效解決模擬量受干擾而影響精度的問題，彌補傳統的雙單片機串行傳輸方式傳輸距離短、傳輸速率低的缺陷。關鍵詞：A/D 數據共享 MAXl96 雙單片機
上傳時間： 2013-12-25
上傳用戶：1234567890qqq
