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MCP23017_WE
2023-12-24
Library for the MCP23017 and MCP23S17 I/O Expander
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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)
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Reviews
5
(1)
user_Nks578wq
2025-04-17
As a dedicated user of the MCP23017_WE, I must say this product by wollewald has significantly improved my projects. The comprehensive library and excellent documentation made it incredibly easy to integrate. It's reliable and versatile, perfect for expanding GPIO capabilities. Highly recommend checking it out on GitHub at https://github.com/wollewald/MCP23017_WE.