Sorry, the first submission went wrong. The question is if anyone has a recommendation for a good Arduino library to work with multiple PCF 8575 modules. Any suggestion is more than welcome. Thanks!
Thank you Sara, I think it is going to be straithforward with the addressing via I2C. In any case if I find a problem I will post on it.
Best Regards, Ludo
My experience is doing it straightforward using the wire library works great. They will work on 3V3 just keep the pull ups 1.5 to 3K range.