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Send message to Arduino device from MATLAB


[dataOut,payloadSize] = sendCommand(obj,libName,commandID,dataIn)
[dataOut,payloadSize] = sendCommand(obj,libName,commandID,dataIn,timeout)



[dataOut,payloadSize] = sendCommand(obj,libName,commandID,dataIn) sends a command to the Command Handler implemented by your add-on library.

[dataOut,payloadSize] = sendCommand(obj,libName,commandID,dataIn,timeout) sends a command to the Command Handler implemented by your add-on library with a user-specified acknowledgement timeout.


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Create a command, and use sendCommand to send it to the Arduino® hardware.

Get the parent Arduino object.

arduinoObj = obj.Parent;

Define the library name.

libName = 'ExampleAddon/HelloWorld';

Define the command ID, and create data to send.

commandID = obj.READ_COMMAND;
dataIn = [];

Send the message.

[dataOut, payloadSize] = sendCommand(obj, libName, commandID, dataIn);

Show the result in the MATLAB® command line.

Hello WOrld!

Input Arguments

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Handle to the Arduino object stored in the private Parent property of the custom class.

Name of library defined in the custom class, specified as a character vector.

Unique command identifier, specified as a number. This number must match the ID in the command handler defined in your custom library header file.

An array of integers, specified as a vector. The size of dataIn is different for different boards. The below table specifies the size of dataIn for different boards :

BoardsdataIn size
Leonardo, Micro150 bytes
MKR1000, Mega2560,MegaADK, Due720 bytes
Uno. Nano, Pro Mini, Digital Sandbox57 bytes

Each byte is limited to an unsigned integer between 0 and 255. Any values greater than 255 must be converted into two unsigned integers between 0 and 255, and will be sent as two separate bytes.

Timeout duration, specified as a numeric value that is the number of seconds to wait for an acknowledgement from the server code. Specifying a timeout duration blocks the MATLAB command line until the timeout duration is met. The default is 5 seconds if timeout is not specified.

Output Arguments

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Data returned, as an array of doubles

Data Types: uint8

Length of the output returned by sendCommand, as a number.

Introduced in R2015b