Add support for MCP23017 16 bit I/O expander

[flyte]

Originally posted as a pull request by @eXCepT74 so I've moved it to an issue:

Is that possible to add support for MCP23017 - it has 16 I/O ports , I2C and each port can be loaded with 20mA , it has as well switchable active pullup resistors. I probably will use ur project to control my smart house based on PCF, but MCP is good idea as well. Anyway great project! Keep going like that!!! regards

[rbswift]

Yes please!

This would be great because then the AB Electronics IO Pi Plus 32 channel IO expansion board would be supported. (https://www.abelectronics.co.uk/p/54/io-pi-plus).

I see the MCP23017 is the I2C version of the MCP23S17 which uses SPI and is used on the piface2 expansion board which is already supported.

I'm currently using piface2 successfully but need more IOs

[rbswift]

there is actually some sample code here that might be useful...

https://github.com/abelectronicsuk/ABElectronics_Python_Libraries

[genex89]

I Need support for MCP23017 - it has 16 I/O ports. News about this?

[Misiu]

Home Assistant recently added MCP23017 support - home-assistant/core#23127 maybe this code will be useful

[rbswift]

Is there any update on this? It seems like quite a popular chip. I'd really like to have 16 I/Os

[aerodolphin]

Any update on this? I came from openhab, and I would like to use my expander boards That I develop with MCP23017.

I have some boards with 48 I/O and another boards with 32 I/O. It's very useful for everyone like me that want to have a lot of wired sensors and switches.

[aerodolphin]

Can someone give some guidance to develop this new module or make it? I can pay for the job.

Maybe the module pcf8575 will work.

[flyte]

Hey, sorry for the delay. Is there an existing Python MCP23016 library that we could use for integration? If so, it's a relatively simple job of copying one of the other modules for reference and modifying it to work with the different library.

[flyte]

I've just read the rest of the comments.. Ideally we'd use some kind of pip-installable package that enables control of the MCP23017. I suspect there is something usable, and I'll have a look this weekend.

[aerodolphin]

The is some Python libraries on the internet. Here you have two examples:

https://pypi.org/project/RPi-MCP23017/

https://github.com/owainm713/MCP230XX-Python-Module

Maybe can be useful. Thanks for the help.

I will share after the hardware info that can be used by anyone.

[aerodolphin]

Here is a photo of the 48Ch expander that I developed to expand the Raspberry Pi GPIO IOs by I2C with MCP23017 multiplexers.

[Misiu]

@aerodolphin this looks awesome 👍🎉🚀
Are you planning to release the schematics? I'd like to make one to use this with Home Assistant (it supports MCP23017)
I don't need 48 I/O, 30 will be enough, but maybe in the future, they will be used.