MATLAB Answers

Create a block to read keyboard inputs

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Raju Purohit
Raju Purohit on 17 Jun 2011
Edited: John Kelly on 26 Feb 2015
I want to create a block in simulink which prompts me to enter a key & reads ASCII values from keyboard while running a simulation. Input to the block is through keyboard & output is its ASCII value.
I think this can be done either in S-function or embedded matlab function blocks. But I dont know how to use these blocks.
Can someone help???

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 17 Jun 2011
Drag and drop a Constant block, right click it, select "Block Properties ...", click the "Callbacks" tab, select "OpenFcn", type in the following line,
set(gcbh,'Value',num2str(double(input('Press a key: ','s'))));
Set your model simulation stop time to be inf and run the simulation, while the simulation is running, double click the Constant block, switch to Command window, press a key, observe the output value of the Constant block.

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Raju Purohit
Raju Purohit on 21 Jun 2011
That was helpful to some extent. I am basically trying to model (3D model using VRML) a block which should move right when I press right arrow key, move up when i press up arrow key and so on. I need to continuously feed the input through keyboard.
Fangjun Jiang
Fangjun Jiang on 21 Jun 2011
Then, a MATLAB Fcn block would do it. Type in double(input('press a key','s')); in it and run the simulation. Keep in mind though, that this will ask you for a key input every simulation step. I tried a simple example and the value output is right. Not sure how the rest of your model would work with it.

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More Answers (1)

Kaustubha Govind
Kaustubha Govind on 17 Jun 2011
Edited: John Kelly on 26 Feb 2015
The Embedded MATLAB Fcn block should be sufficient for your purpose. You can use the input function to read inputs from the keyboard.
Here is an example using the Embedded MATLAB Block: Creating an Example Model That Uses a MATLAB Function Block.

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Raju Purohit
Raju Purohit on 21 Jun 2011
Actually Embedded MATLAB Block does not support input function.
Kaustubha Govind
Kaustubha Govind on 21 Jun 2011
You can use eml.extrinsic to call functions unsupported for code generation.

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