https://github.com/wollewald/mcp23017_we

Library for the MCP23017 and MCP23S17 I/O Expander
https://github.com/wollewald/mcp23017_we

arduino arduino-library attiny85 i2c mcp23017 mcp23018 mcp23s17 mcp23s18 portexpander spi

Last synced: 7 days ago
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Library for the MCP23017 and MCP23S17 I/O Expander

• Host: GitHub
• URL: https://github.com/wollewald/mcp23017_we
• Owner: wollewald
• License: mit
• Created: 2019-05-11T12:31:06.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-12-24T12:34:10.000Z (11 months ago)
• Last Synced: 2023-12-24T13:26:30.454Z (11 months ago)
• Topics: arduino, arduino-library, attiny85, i2c, mcp23017, mcp23018, mcp23s17, mcp23s18, portexpander, spi
• Language: C++
• Homepage: https://wolles-elektronikkiste.de/en/port-expander-mcp23017-2
• Size: 4.19 MB
• Stars: 36
• Watchers: 5
• Forks: 4
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# 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:

![new_design_mcp23017](https://user-images.githubusercontent.com/41305162/232289151-890811c7-b6f1-40a1-af07-35e38afbcfbe.png) 

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)