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Custom Arduino Library won't register.

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Kevin Gilliam
Kevin Gilliam on 5 Feb 2018
Commented: Charity Reed on 9 Oct 2020
As the title suggests, I am trying to implement custom libraries with the Arduino support package, but I can't get them to register. I'm using 2017b on Windows 10. Support package is version 17.2.0.
I've tried with the three example tutorials (LCD, Ultrasonic, and HelloWorld), and no luck getting them to register.
I have definitely added my arduino libraries to the path, along with my working directory that has my package directories and .m files. I've un/re-installed the support packages (in admin mode and not) and no luck. I did the thing they suggest for troubleshooting here
Here is my HelloWorld.h file:
#include "LibraryBase.h"
class HelloWorld : public LibraryBase {
HelloWorld(MWArduinoClass& a){
libName = "ExampleAddon/HelloWorld";
void commandHandler(byte cmdID, byte* dataIn, unsigned int payloadSize){
switch (cmdID){
case 0x01:{
byte val [13] = "Hello World";
sendResponseMsg(cmdID, val, 13);
// Do nothing
And here is my HelloWorld.m:
classdef HelloWorld < arduinoio.LibraryBase
properties(Access = private, Constant = true)
READ_COMMAND = hex2dec('01')
properties(Access = protected, Constant = true)
LibraryName = 'ExampleAddon/HelloWorld'
DependentLibraries = {}
ArduinoLibraryHeaderFiles = {}
CppHeaderFile = fullfile(arduinoio.FilePath(mfilename('fullpath')), 'src', 'HelloWorld.h')
CppClassName = 'HelloWorld'
function obj = HelloWorld(parentObj)
obj.Parent = parentObj;
obj.Pins = [];
function out = read(obj)
inputs = [];
output = sendCommand(obj, obj.LibraryName, cmdID, inputs);
out = char(output);
No matter what I try, the end result is always the same:
6×1 cell array
{'I2C' }
{'RotaryEncoder' }
{'SPI' }
{'Servo' }
{'ShiftRegister' }
Any thoughts? Thanks!
  1 Comment
Madhu Govindarajan
Madhu Govindarajan on 5 Feb 2018
So when you say you tried the example tutorials LCD one - are you referring to this one here -
If so, have you confirmed that when you are adding the files to the path that the subfolders are being included?
Are you getting any error messages/warning messages that are suppressed while you are following these tutorials?

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Accepted Answer

Menghan on 5 Feb 2018
Hi Kevin,
I know you have tried with the example add-on, but just to confirm it again, can you run the following code in MATLAB where you have the support package installed?
See if you get the HelloWorld addon registered. If not, please contact our Technical Support to get further help.
On a side note, you are missing a semicolon at the end of your class definition in the HelloWorld.h file. Each C++ class ends with it. It will cause arduino programming to fail, after the library register issue is solved.
MATLAB Hardware Team
Charity Reed
Charity Reed on 9 Oct 2020
I'm having the same issue but all my directories are named correctly and I am still not able to get it to work. But when I tried Menghan's addpath line, that works but I still can't add my own libraries. Even my own helloworld

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