How can I connect simulink with Arduino Mega2560 ?

I am using matlab R2021b and arduino mega2560 , I have designed 1 simple project up and running , but simulink gave error like below :

Anyone help me. Thanks

Answer 1

[Samhitha]

Hi @xuan hoa,

There is a Simulink External Mode connection issue between MATLAB R2021b and Arduino Mega 2560. Here are few ways to resolve it

1.Check the COM Port:

• Make sure your Arduino is connected to the correct COM port.
• In Simulink, go to Hardware Settings > Target Hardware Resources > Host-board connection > Set the correct COM port (it should match the one in Device Manager).

2.Close Other Serial Connections:

• The Arduino IDE Serial Monitor, or another application may be using the COM port.
• Close the Arduino IDE and make sure only MATLAB/Simulink is using the COM port.

3.Baud Rate Mismatch

• By default, Simulink external mode uses 115200 baud.
• If you manually change it in the model or Arduino, make sure both matches. Arduino must be compiled with the same baud rate.

Hope this helps!