Batteryless UV Index (UVI) and Heat Index Monitor with AVR32DB32

What really interests me about this design is the buck Boost-converter

So this buck boost-converter is 100% core-independent. The Analog Comparator, TimerD, CCL, and Event-System are all active while the AVR DB sleeps, meaning that the microcontroller can run this simple buck boost-converter without any cost to CPU time.

An incredible design that demonstrates the flexibility of AVR DB's combined peripherals.