Raspberry Pi - 128 I/O Expansion

by sjm.
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2 layer board of 1.54x3.52 inches (39.12x89.41 mm).
Shared on October 14th, 2015 21:49.

Add an extra 128 I/O lines to a Raspberry Pi. Uses 8x 16-bit MCP23017, and address selection is made via fitting or removing resistors.

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