This example demonstrates real-time control of a Kniwwelino board’s LED matrix by sending serial messages. The Arduino sketch uses the `Kniwwelino` library’s `MATRIXdrawIcon` function to render the received string pattern on the built-in display. Data arrives as ASCII text over the serial port, terminated by a pipe character (`|`), which triggers parsing and immediate matrix update. The `setup()` initializes the board with WiFi disabled and fast boot enabled, while the main loop continuously reads serial input, buffers it, and applies the icon when the delimiter is received.