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matlab function for arduino

Asked by john white on 13 Mar 2019
Latest activity Commented on by john white on 14 Mar 2019
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:
Capture.PNG
Capture1.PNG

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2 Answers

Answer by Madhu Govindarajan on 13 Mar 2019

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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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 by Madhu Govindarajan on 14 Mar 2019

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 -
Madhu

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is there any way to read the encoder pulses(or position and speed of the encoder) in simulink?

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