Block sample time: Period in which the Arduino is sending data (20 Hz rate in my case).Select Output last received value in the selection box.Enable blocking mode: Make sure to check this option.Remember: The Data type and Data size are correlated, so if you set Data size to using Data type single Simulink will expect to receive 3 * 4 bytes = 12 bytes every step. Data type If you are sending float from Arduino, make sure to select single in Simulink, since both type of variables are intrinsically the same (floating point number with 4 bytes of length).Data size: If you are sending only one float from Arduino, use but you can change it to or where N is the number of float you are receiving from Serial.Terminator: Same as the header, but indicates the package end.In this example I used the byte 'A', but you can use whatever you want. This is not strictly necessary to your communication, but I highly recommend using it because avoids all types of synchronization issues (Simulink crashes after some time receiving data).
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