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The first 2 are bound to INTA and the other 2 to INTB (but that is not really important to you, as it's handle by the zyncoder library ;-)
The first 2 are bound to INTA and the other 2 to INTB (but that is not really important to you, as it's handle by the zyncoder library ;-)
If you have a recent version of the MCP23017 you are lucky, as it includes an extra row-pin connector (SW-1) that allows to easily use this extra GPIO ports. If you don't, you have to solder your wires directly to the MCP23107 pins. Not difficult at all, but not really nice.
If you have a recent version of the All-In-One circuit, you are lucky, as it includes an extra row-pin connector (SW1) that allows to easily use this extra GPIO ports. If you don't, you have to solder your wires directly to the MCP23107 pins. Not difficult at all, but not really nice.
This is the pin assignment for the row-pin connector (SW-1):
This is the pin assignment for the row-pin connector (SW-1):