He set out to build a cheap projection clock using a small LCD screen, a cheap LED backlight ... other decisions. His project has room to grow as well: it runs from an Arduino compatible STM32 ...

An LED ornament for the Christmas tree can be built in any manner of simple, easy implementations ... and programmers for the device from other projects where he uses it more extensively, so ...

In need of a simple microcontroller board for your project ... the R4 WiFi boasts is its 12x8 red LED matrix, which is readily programmable using the Arduino_LED_Matrix library.