A Godot 4.1+ plugin to read/write Arduino serial input.
Read GDExtension for more

If serial input is not what you're looking for maybe a plugin for MQTT would suite you better?
godot-mqtt repo made by Julian Todd

• Godot 4.1 or above
• godot-cpp
• libserialport (LGPL-3.0 license)
  • MSBuild v143 or later for Windows builds
  • 'apt install autoconf libtool' for Linux
• fmt (./src/fmt/) (MIT license)

• SCons
• Python 3.10 or above
• Python virtual environment
• Git

Experimental feature
The Scons build will generate a Compilation Database (CD). CLion can open a CD directly
You can also run the generate_cmake.py script to generate a CMakeLists.txt.

mkdir build
cd build
cmake .. 
make

src - Plugin source code
deps - Dependencies, like libserialport. Will be created on install\
godot-cpp - Godot bindings. Will be created on install\

This will build everything form scratch

python -m venv ./pvenv
// Activate pvenv for Windows
pvenv\Scripts\activate
// Activate pvenv for Unix/MacOS
source pvenv/bin/activate
pip install -r requirements.txt
python install.py

This will only build the GDSercomm part. Requires at least on Full Build before working

python -m venv ./pvenv
// Activate pvenv for Windows
pvenv\Scripts\activate
// Activate pvenv for Unix/MacOS
source pvenv/bin/activate
pip install -r requirements.txt
python build.py

After a completed build all files you need will be in ./demo/bin directory. Except the libserialport library. It will be inside the ./deps/libserialport directory.

Windows = .\deps\libserialport\x64\Debug\libserialport.dll
Linux = libserialport.so

1. Create a SerComm node in your scene.
2. Select baudrate and port number.
3. Create a script on any other node in scene
4. script your logic

By toggle the radio button the extension will search for available ports and refresh the port dropdown list.

Create a SerComm node for each port you want to read or write to.

func _process(delta):
  var in = waiting_input_bytes();
  var read = read_serial(in);
  print(read);