matlab function for arduino

Question

john white 2019-3-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/449921-matlab-function-for-arduino

评论： john white 2019-3-14

Hi

I want to use matlab function to write code for Arduino boards

in the matlab function I have written this :

function [count1 count2 count2]=fcn
a1=arduino('com3','due','Libraries','RotaryEncoder');
a2=arduino('com5','uno','Libraries','RotaryEncoder');
encoder1=rotaryEncoder(a1,'D2','D3');
encoder2=rotaryEncoder(a1,'D4','D5');
encoder3=rptaryEncoder(a2,'D2','D3');
count1=readCount(encoder1);
count1=readCount(encoder2);
count3=readCount(encoder2);
end

but it showed this error:

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Answer 1

Madhu Govindarajan 2019-3-13

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Based on the error it looks like you are attempting to use MATLAB Function block within a Simulink Model. In this approach, you cannot use arduino function and other MATLAB Support Package for Arduino functions as this workflow is completely different from Simulink Support for Arduino.

If you post details about your project, experts might be able to assist you with selecting the appropriate workflow.

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john white 2019-3-13

actually I want to control 3 dc motors with encoders , so I have a matlab function to create a controll output signals and get the encoders position and velocity as inputs so I have used three matlab function blocks one of them is using for control function , one is used to read the encoders position and velocity and the last one is used to write the voltage of the motors and get the output signals of the control block as the input signals

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Answer 2

Madhu Govindarajan 2019-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/449921-matlab-function-for-arduino#answer_365361

I think you are better off using the Simulink workflow to perform controls and not use the MATLAB Support package for Arduino functions in MATLAB function blocks. Given that comment, if you want to control DC motors from an Arduino people usually use a Motor Control board or are using direct PWM signals.

So I propose you create a new question in Maker Community here mentioning details of your hardware setup including what motors you have, what is the controlling method (see above), what encoders are you using etc. This will get you the right answer the fastest.

If you are looking for generic examples, here are some links -

PWM - https://www.mathworks.com/company/newsletters/articles/motor-control-with-arduino-a-case-study-in-data-driven-modeling-and-control-design.html

motor and encoders using MKR Motor Carrier - https://www.mathworks.com/matlabcentral/fileexchange/68620-arduino_engineering_kit_hardware_support_18b

Madhu