MCP23017_WE

This is a library for the MCP23017, MCP23S17, MCP23018 and MCP23S18 I/O Port Expander.

You'll find some examples including the wiring (examples folder) which should enable you to use the library. Furthermore I have added a list of commands.

I have implemented an option to use it with an ATtiny and the TineWireM library.

In case you like this library it would be cool if you give it a star.

If you find bugs, please inform me!

Important notice: In 2022 Microchip has unfortunately updated the design of the MCP23017. GPA7 and GPB7 have lost their input function:</BR> </BR> You can only use these pins as output. There is no change to the MCP23S17, MCP23018 and MCP23S18. You find this information in latest datasheet: https://www.microchip.com/en-us/product/mcp23017

Written by Wolfgang (Wolle) Ewald

http://wolles-elektronikkiste.de/portexpander-mcp23017 (German)

https://wolles-elektronikkiste.de/en/port-expander-mcp23017-2 (English)