Hi Muhammad,
The working of the model you have shared is a bit vague, but in general if you wish to read RPM values from an encoder, I suggest creating your own MATLAB function to do so. While there is no encoder block for the Arduino boards, you can utilize a MATLAB function blocks and use interrupts to do so on your own. You can refer to this community post, where a staff member has provided detailed steps:
I hope this helps,
Adit Kirtani.
