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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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How to avoid a Data Missed event in matlab when doing data acquisition from an NI board?

I am receiving DataMissed event(s) in matlab when acquiring waveform data (2 channels) and an analog input trigger (set up in pretrigger mode - negative delay value). Here is the code: sampleRate = 500000; pretrigger = 8; trigger_value = 0.6; ai =…
Ben
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Why is "user acquisition" metric greater than "store listing visitors" on Google Play Console?

I'm using Google Play Console Statistics to get some Analytics from my Android app. However, I am getting that "user acquisition" metric is greater than "store listing visitors" which I don't understand. How can I have more installs than visitors? I…
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What is the difference between "store listing acquisitions" and "new acquisition users" on Google Play Console?

I am trying to get the number of installs of my Android app but can't figure out which metric I should use: "store listing acquisitions" or "new acquisition users". Using the first one, I'm getting more registrations than installs, which cannot be…
dcs9348
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Database design for data acquisition with multiple variable types

I'll design and implement database for data acquisition and started to wonder what might be the best relational database structure for multivariable solution. There can be dozens of variables (configurable), different types (boolean, integer, float…
Harriv
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Data type to save expanding data for data logging in Python

I am writing a serial data logger in Python and am wondering which data type would be best suited for this. Every few milliseconds a new value is read from the serial interface and is saved into my variable along with the current time. I don't know…
LimaKilo
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How to read every n miliseconds a double value from .txt file in Simulink for a real-time application?

What I'm doing is a real-time application for visual servoing that needs to read an X and Y values of a coordinate during running time. As the simulation runs, these values are changed in time by a Python Script and then, I need to read every n…
Alejandro Hernández Villa
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Streaming data over bluetooth

I'm working on a project that streams data to a laptop. The data is an analog signal with 5 kHz bandwidth (almost like audio) that is digitized at first and should be transmitted over a bluetooth module to a laptop. I've searched a lot about modules…
blue saturn
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Better way to write so many values in files Python (Lack of memory in a device)

I have a question about file output in Python. I was designing a software that reads values from 3 sensors. Each sensors read 100 values for 1 second, and between each process, I have to print them in file. time_memory = [k + i/100 for i in…
jdub Kim
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Transmitting data from Arduino UNO into MATLAB but getting a lot of NaNs and numbers with missing digits

I'm collecting degree data from an encoder using an Arduino Uno, and then sending that data into MATLAB using USB. In order to get velocity of rotation as well, I'm generating and sending a timestamp after every degree data point from the Arduino…
MrBaba
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Adding delay in data acquisition in labview

(Sorry I was not able to post picture as my reputation level is below 10) What I wanted to do is, I want my laser displacement daq to start acquiring data after one second after the another daq acquisition starts acquiring data. I am not able to…
Biswas
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How to carry out multiple SI acquisition automatically?

I would like to write a Gatan DigitalMicrograph script to acquire multiple EELS spectrum images continuously. If there is a command to obtain Spectrum Image (SI) data, and store the three-dimensional image to an array, I will achieve my plan.…
kachigusa
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Efficiently processing a very large unicode string into csv

Usually I'm able to find the answers to my dilemmas pretty quickly on this site but perhaps this problem requires a more specific touch; I have a ~50 million long unicode string I download from a Tektronix Oscilloscope. Getting this assigned is a…
Steven Yampolsky
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Updating From Old DirectX 7 C++ Code... [dx7vb.dll]

Quick background: This is a large and old software project involving C# UI code and some underlying C++ code. This question pertains to the C++ code. The C++ is responsible for creating an "efficient" (for the time) scrolling effect on a square…
djrecipe
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Data from LabVIEW to Matlab for processing

I want to make a biometric identification system of the ECG/EKG. Provided that Matlab does not perform Data Acquisition in Real Time (for monitoring), is there any way to make the monitoring and data acquisition in LabVIEW and then work…
Zebbiche Badreddine
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Serial output ADC - minimum acquisition time

I'm working with this ADC: AD7903 - http://www.analog.com/media/en/technical-documentation/data-sheets/AD7903.pdf I don't understand the limitation of the acquisition time in relation with the maximum clock speed possible for the SPI interface. The…
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