Real time data acquisition

Question

Aloka Perera 2019-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/444260-real-time-data-acquisition

评论： Andrey Kiselnikov 2019-2-12

Im trying to acquire EMG signals real time using Arduino support package in simulink. I'm using analog Input block for data acquire. But I dont get data at the rate I wanted it to be. for example, for 1k sampling frequency I dont get expexted samples. futhur more, when the filters also added to the block, this becomes more slower and loss huge amount of data.Is there a way to make this process faster, so that i can obtain expected samples.

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Answer 1

Andrey Kiselnikov 2019-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/444260-real-time-data-acquisition#answer_360453

I tried to do exactly the same thing. This hardware stack is not able to provide the required sampling frequency. This issue related to some features of Arduino programming through MATLAB/Simulink. There is only one way to solve your task on this hardware - write code for Arduino manually and acquire data to MATLAB through the serial connection. And you should use DUE - one of the most powerful boards in Arduino family.

p.s. I migrated to Raspberry PI platform for this task.

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Aloka Perera 2019-2-11

programming on Arduino.it is difficult to obtain samples at 5k and perform serial communication simultaneously

Andrey Kiselnikov 2019-2-12

I tested DUE. I added the digital output pin in the capturing loop and measured time of each operation: analog capture, serial sending, sliding window average filtering - yes, with the good realization it allows to reduce serial data stream and increase the total data capture frequency. So my result was around 2.5 kHz.

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