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Questions regarding Port or IO Expanders, be it I2C, SPI, 1-Wire, serial/uart or similar. Shift-Registers are normally NOT considered Expanders, and have their own tag.

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Wiring CJMCU-2317 MCP23017

I got the CJMCU-2317 MCP23017 I2C Serial Interface 16 bit I/O Expander Serial Module to use on a split keyboard as an extension matrix. …
Issam Zoli's user avatar