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16 lines
668 B
Plaintext
16 lines
668 B
Plaintext
Ben Blinkenlights
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=================
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This project is a proof of concept implementation of Rikard Lindstrom's
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idea of using the Ben's uSD slot as a general extension interface also
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for devices that don't speak MMC or SD/SDIO. The application is a simple
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LED circuit, as suggested by David Samblas.
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The uSD slot gives access to six GPIOs, a 3.3 V supply that can be
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switched on and off by software, and ground. We use a simple form of
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multiplexing to drive ten LEDs with this interface.
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Note that one should only light one LED at a time. If multiple LEDs are
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lit, they will share the current though the common resistor, and will
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thus be less bright than a single LED.
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