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Expand your GPIO ports by another 16 with this great add on board for the Raspberry Pi! This easy assembly kit from MyPiFi features a plumbed-in MCP23017 IC - It uses two i2c pins (which can be shared with other devices if required) and in exchange gives your Pi another 16 GPIO's! Each I/O pin can be configured as an in input, output or an input with a pullup resistor.
Note: This comes in kit form, so some soldering assembly is required.
Please note, whilst the MCP23017 does have 3 address select pins, they are not changable on this board