The idea is to have an LED coaster powered from super capacitors and wirelessly charged. As capacitors don't have the storage capabilities of batteries, it is important to design this to have as low of power draw as possible. For that reason I won't be using a microcontroller, or having more than one LED on at a time.

Main working parts:

Wireless charging coil:

-5V in, 5V out

Super capacitors:

-15F devices, rated for 2.8V

Voltage regulator:

-brings in 5V from the charging coil, regulates to 2.75V

555 Timer:

-set a frequency for a 4-bit binary counter

4-bit binary counter:

-count from 0-15. Feeds 4-16 bit decoder.

4-16 bit decoder:

-a counter feeding into this allows to pulse one LED at a time (16 total LEDs)

LEDs:

16 LEDs along the edge of the coaster. The effect of one on at a time will create a spinning effect.