sendCommand

R2026b

Send message to Arduino device from MATLAB

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Syntax

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

Description

Add-On Required: This feature requires the MATLAB Support Package for Arduino Hardware add-on.

[dataOut,payloadSize] = sendCommand(arduinoObj,libName,commandID,dataIn) sends a command to the Command Handler implemented by your custom Arduino library.

[dataOut,payloadSize] = sendCommand(arduinoObj,libName,commandID,dataIn,timeout) sends a command to the Command Handler implemented by your custom Arduino library with a user-specified acknowledgment timeout.

example

Examples

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

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.

disp(char(dataOut))
Hello World!

Input Arguments

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Arduino object, specified as an object that is an internal variable called from within classes that derive from matlabshared.addon.LibraryBase.

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 varies by board. The following table specifies the size of dataIn for different boards:

BoardsdataIn size
Leonardo, Micro150 bytes
MKR1000, MKR1010, MKR Zero, Mega2560, MegaADK, Due, Nano 33 IoT, Nano 33 BLE, Nano 33 BLE Sense, ESP32-WROOM-DevKitV1, and ESP32-WROOM-DevKitC720 bytes
Uno R4 Minima and Uno R4 WiFi512 bytes
Uno, Nano, Pro Mini, and 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 acknowledgment 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: double

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

Version History

Introduced in R2015b

See Also

Topics