Those boards provide serial and file access over BLE instead of USB using open protocols. (Some boards may use both USB and BLE.) BLE access can be done from a variety of apps including ...

mkdir project-name && cd project-name python3 -m venv .venv source.env/bin/activate pip3 install circuitpython-i2c-expanders Installing to a Connected CircuitPython Device with Circup Make sure that ...

These versatile chips take the bother of scanning the LED matrix away from the microcontroller with their own internal frame registers fed from an I2C interface.