As the subtitle says, it is an Arduino-compatible development board in the shape of Poland.

The design is based on the ATmega328PB microcontroller. In place of Warsaw (the capital), green LEDs are mounted, which can be controlled by the user's program. They are mounted upside down to shine through the PCB.

An additional attraction, not often found on boards of this type, is a built-in speaker that can be used to play any melodies.

To test the functionality of the board, a demonstration program was written that blinks the Warsaw LED to the rhythm of Mazurek Dabrowskiego played by the speaker. The program can of course be run on any Arduino board equipped with the appropriate peripherals. A link to the repository with the source code and a video of the running program can be found below.

It is worth mentioning that the demo program was written with help of GPT-4o and aider.

For the sake of the project, I started a Kickstarter page (link below).