Attached is my Arduino library for the Microchip MCP23017 and MCP23018 I/O expander chip. It uses the Arduino Wire library and was developed on a WeMOS D1 mini. NOT FULLY TESTED. The input and interrupt facilities have not been tested but the output has been tested and works. This chip has three …

My library for the Microchip MCP23017 and MCP23018 I2C I/O expander ICs

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