Simplest way to build a GUI to communicate with arduino UNO R4

[DaveX]

I’d split it into two parts:

Rewrite your Arduino code to use a serial protocol

Write a gui to work with the serial protocol

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There are a lot of serial communication examples in the built-in examples and elsewhere. See

Wokwi Simulations for Arduino Built-In Examples

This thread contains links to Wokwi simulations for some of the Arduino Built-In Examples The built-in examples are available within the IDE under the File/Examples/ tab. Basics Analog Read Serial tutorial Analog Read Serial Simulation -- Reads an analog pin and prints the results to serial Bare Minimum code needed tutorial Simulation does nothing, but can test your compiler/upload connection. Blink tutorial Simulation -- Blinks a LED based on delay(1000). Often used to test your IDE …

If you figure out a serial protocol, writing a gui that sends messages out on usb/serial has been solved thousands of times.