Ben Blinkenlights
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This project is a proof of concept implementation of Rikard Lindstrom's
idea of using the Ben's uSD slot as a general extension interface also
for devices that don't speak MMC or SD/SDIO. The application is a simple
LED circuit, as suggested by David Samblas.

The uSD slot gives access to six GPIOs, a 3.3 V supply that can be
switched on and off by software, and ground. We use a simple form of
multiplexing to drive ten LEDs with this interface.

Note that one should only light one LED at a time. If multiple LEDs are
lit, they will share the current though the common resistor, and will
thus be less bright than a single LED.