Extend Raspberry PI GPIO PIN

1. 최근 고민하고있던 내용에 대해, 이미 누군가 라즈베리파이 포럼에 동일한 질문을 함.
https://www.raspberrypi.org/forums/viewtopic.php?f=47&t=40879

2. 솔루션
http://nathan.chantrell.net/20120519/raspberry-pi-and-the-mcp23017-i2c-io-expander/

mcp23017 칩을 이용하면 추가적인 핀사용이 가능하다고 한다.

그런데 mcp23017 을 가지고 어떻게 하면 되는거지?

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