本文介紹一種采用智能數字溫度傳感器DS18B20進行溫度采集,并通過單片機與PC機完成數據處理的系統。 硬件電路由四部分組成:溫度數據采集部分,即時溫度顯示驅動部分,溫度數據存儲部分和上位PC機數據處理部分。整個硬件設計原理圖如圖1所示。
上傳時間: 2013-10-28
上傳用戶:wettetw
在測控領域中,經常遇到監測對象輸出信號較小,難以直接采集,一般都需要將其放大后再做處理。介紹了一種小信號采集系統的實現方法,利用具有A/D轉換功能的單片機STC25A60S2和具有精確放大功能的易用放大器AD620實現了最小系統,并論述了系統設計與實現,詳細介紹了采集小信號的過程,并給出了實際應用的例子,以及小信號采集在相關領域的應用。
上傳時間: 2014-01-03
上傳用戶:xuanjie
基于FPGA的高速圖像數據采集系統設計
上傳時間: 2014-12-26
上傳用戶:devin_zhong
于FPGA和面陣CCD攝像頭的動態光譜數據采集與預處理
上傳時間: 2013-10-16
上傳用戶:dongqiangqiang
本文是基于C8051F單片機的便攜式農田基礎信息采集系統的設計方案,為了克服現有農田綜合數據采集設備的移動性差,高成本,使用復雜的不足,本文提供一種便攜嵌入式農田基礎數據采集終端,該終端具有體積小、功耗低、攜帶性好、操作簡單、安裝方便、模塊化和可擴張性及網絡化功能,農業生產管理人員可以隨意攜帶到田間地頭進行使用。
上傳時間: 2013-11-09
上傳用戶:huyanju
基于單片機的多路數據采集系統
上傳時間: 2014-12-26
上傳用戶:龍飛艇
PC與單片機數據采集系統的USB通訊設計論文
上傳時間: 2013-10-30
上傳用戶:hanli8870
便攜式信號采集在機器健康診斷系統中有較高的應用價值。機器健康診斷的信號特點是包括低頻信號。本文研究是為了實現簡易而且低成本的低頻便攜式信號采集。以Microchip公司單片機PIC18F1320為核心設計信號采集電路,實現了信號的采集和保存。系統采用串行電可擦除芯片24LC32A保存數據,經過有線通信,信號數據由串行口通過MAX232芯片輸送到微型計算機接收和保存,最后繪制出信號波形。 微型計算機程序采用Visual Basic編程。研究成功采樣頻率為3 kHz的復雜信號,證明該方案符合設計要求。 Abstract: Portable signal acquisition is useful in machine health monitoring systems. The signal characteristics of machine health monitoring includes low frequency signals. The goal of this study is to realize simple, inexpensive and portable low frequency signal sampling. This paper provides the project of signal acquisition system design based on PIC18F1320 microcontroller manufactured by the Microchip Technology Incorporation to achieve signal sampling and storage. The system adopted EEPROM 24LC32A to store the signal data. The microcomputer received data via wired link with the MAX232 IC through the serial port. The microcomputer program, programmed in Visual Basic, received the data, stored it and plotted the signal. The study successfully samples 3kHz complicated signals and thus meets the design requirement.
上傳時間: 2013-11-19
上傳用戶:moerwang
為了使音頻信號分析儀小巧可靠,成本低廉,設計了以2片MSP430F1611單片機為核心的系統。該系統將音頻信號送入八階巴特沃茲低通濾波器,對信號進行限幅放大、衰減、電平位移、緩沖,并利用一單片機負責對前級處理后的模擬信號進行采樣,將采集得到的音頻信號進行4 096點基2的FFT計算,并對信號加窗函數提高分辨率,另一單片機負責對信號的分析及控制顯示設備。此設計精確的測量了音頻信號的功率譜、周期性、失真度指標,達到較高的頻率分辨率,并能將測量結果通過紅外遙控器顯示在液晶屏上。 Abstract: o make the audio signal analyzer cheaper, smaller and more reliable, this system sends the audio signal to the eight-order butterworth filter, and then amplifies, attenuates, buffers it in a limiting range, transfers the voltage level of the signal before utilizing two MSP430F1611 MCU to realize the audio analysis. One is charged for sampling and dealing with the processed audio signal collected by the 4096 point radix-2 FFT calculation and imposes the window function to improve the frequency resolution. The other one controls the display and realizes the spectrum, periodicity, power distortion analysis in high resolution which is displayed in the LCD screen through the infrared remote control.
上傳時間: 2013-12-11
上傳用戶:jasonheung
針對目前使用的RS232接口數字化B超鍵盤存在PC主機啟動時不能設置BIOS,提出一種PS2鍵盤的設計方法。基于W78E052D單片機,采用8通道串行A/D轉換器設計了8個TGC電位器信息采集電路,電位器位置信息以鍵盤掃描碼序列形式發送,正交編碼器信號通過XC9536XL轉換為單片機可接收的中斷信號,軟件接收到中斷信息后等效處理成按鍵。結果表明,在滿足開機可設置BIOS同時,又可實現超聲特有功能,不需要專門設計驅動程序,接口簡單,成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot, this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller,designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter, potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU, software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot, ultrasound specific functionality can be achieved at the same time, it does not require specially designed driver,the interface is simple and low cost.
上傳時間: 2013-10-10
上傳用戶:asdfasdfd