- display consisting of 1 meter SK6812 LED strip (control code based on WS2812B_STM32_Libmaple)
- linear clock
- alarm with RTTTL Nokia ringtones (main 'play' function taken from here)
- IR remote control (NEC decoder inspired by here)
- sunrise simulator
- white light lamp
- fire effect (borrowed from WS2812FX)
- plasma effect (parts borrowed from FastLED)
Real-world example demonstrating superiority of communicating state machine approach to embedded system design. Without an preemptive OS it's possible to achieve a high degree of concurrency while maintaining footprint only slightly larger than required by bare-metal code. Code structure is isomorphic to UML state diagrams and therefore self documenting. With the traditional implicit global state sharing approach I wouldn't even think of implementing a system like this, specially in limited free time I have.