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Questions tagged [data-acquisition]

Data acquisition deals with accessing, collecting, configuring and controlling external hardware such as sensors, computer ports, various instruments and measurement devices for the purpose of data synchronization, storage or further analysis.

Data acquisition (DAQ) deals with accessing, collecting, configuring and controlling external hardware such as sensors, computer ports, various electronic instruments and measurement devices for the purpose of synchronization, storage or further analysis.

Though there ere are several platforms specializing in DAQ such as Labview, and Matlab's DAQ toolbox, practically any programming language have access to the hardware level from which data can be gathered.

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pyserial time based repeated data request

I am writing an application in python to acquire data using a serial communication. I use the pyserial library for establishing the communication. What is the best approach to request data in an interval (eg every 2 seconds). I always have to the…
Molitoris
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Acquiring images from avertv hybrid volar hd in MATLAB

I want to acquire images from a live video that is getting streamed through avertv hybrid volarhd device (A TV to PC adapter). The device is being identified as a "Video Controller" instead of an "Imaging device" in the device manager(This seems to…
Balraj Parmar
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FFT analysis for Rotor Unbalance

I am working on balancing an air-spindle. For the unbalance analysis I use an accelerometer (NI device). I have the voltage signal from the accelerometer corresponding to the vibration of spindle at a particular frequency (rpm) saved in an excel…
Deep Shah
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Keithley 2410 and PyVISA - VI_ERROR_TMO: Timeout expired before operation completed

I'm trying to control a Keithley 2410 via python on an x86_64 linux machine (CentOS 7). I'm using python 2.7.5, NI-VISA 16 and PyVISA 1.8. The Keithley is connected to the computer via a a RS232-to-USB cable and it's configured for RS232…
d9e3fe01
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Correct usage of memory_order_acquire/release in fetch_XXX function of later version of c++11

I found a code below that is in some class. std::atomic is_locked(false); std::atomic counter(0); bool acquire(){ counter.fetch_add(1,memory_order_acquire); if(is_locked.load(memory_order_acquire)) { return…
mallea
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what is data acquisition layer and Structure in spring mvc

i have a webapp to receive data from devices, and i have a requirements from my customer with following specs- that Data Acquisition Layer should work on open source MQ based delivery mechanism. a) Data acquisition layer must be platform…
Rawat
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Timing issues: QT write to serial port followed by read

I'm making a Qt data acquisition GUI to replace LabVIEW for an application in my lab. I want a pushbutton on my GUI to write some data to the serial port (to a microcontroller), then wait for data acquisition to finish (which the microcontroller…
Michael T
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How to continously log data and plot data using Data Aquisition Toolbox in MATLAB

I am collecting data using the Data Acquisition Toolbox. The data is collected in the background. I am collecting the data from 8 thermocouples and am able to call my listener to continually update my plot. However, I also need to keep a file,…
amkas90
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Simulink: Convert Continuous Signal to Discrete

I am very new to simulink, so this question may seem simple. I am looking for a way to sample a continuous signal every X number of seconds. essentially what I am doing is simulating the principle of a data acquisition unit for a demonstration I am…
James Jonesy
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Measure Volt DC from an Analog input into an array and Calculate Volt DC in RMS

I am developing Test automation in GeoTest ATEasy and LabWindows\CVI, in the tests i measure analog and digital outputs\inputs. In one of the test i need to measure an Analog input which contains an audio signal - and verify its Hz and Volt DC…
Raz
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Receive Seismic Data from Geosig Ve-53

I'm aiming to creat a small data acquisition system that collect data from a Geosig Ve-53 using KPCI-3101 as a physical interface; and python to creat an application that record events and visualize it. The Ve-53 is using 12 Pins Cable as shown in…
Mehdi ouahabi
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Delayed Read response from SR810 lockin amplifier over Prologix GPIB-USB

I am trying to read data from SR810 Lockin amplifier over Prologix GPIB-USB Here is the screenshot of the shell showing commands and their response As we can see, the response to the commands is extremely delayed even when the data points are…
NidhiS
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Extracting data from a plot within a for loop

In MATLAB, I have coded the stochastic simulation algorithm (Gillespie) for a simple birth-death process, and have gotten a plot by using hold on in a for loop. I have 100 values of PStoch for each Qp value, because I have ran 100 simulations for…
abscissa
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Storing analog signal from sensor on COM Port into Java

i am working on a drowsiness detection project using ECG signals,i am still a newbie in Java programming, i have a sensor that i have tweaked to send ECG signals on the COM port of my laptop, can i in Java acquire that signal and save it as a file…
Mohamed Ayman
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Data display GUI with multi threading Python

I'm basically simulating acquiring data from the serial port and plotting it on a graph displayed in a GUI which is made using Tkinter. The incoming serial data is simulated by a simple while loop which calculates a sine function and adds the value…
jquinno
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