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Sweet. So it seems like that'll be the perfect gpio expander for my project yeah?

I'm curious where you're searching. Are you searching for just the chip with no pcb? I'm a noob but I just went on DigiKey and found one made by adafruit mounted on a pcb with no-solder connectors for i2c wired connections. I don't see a C or a D in the datasheet. But the product description...

Not sure where you're seeing that, but it seems like there are multiple mfgs for PCF8575. The Adafruit I'm looking at is 2.5v-5.5v power supply and claims it can accept 1.8v gpio input. For the sake of discussion though. Because there is ready-made code for rotary encoders out there for the...

@TomChiron Thanks for the tips. Im thinking I can skip the multiplexer if I use teensy 4.1 which has 18 analog pins. Then a 15x4 key matrix takes 19 pins. For the rotary encoders Im thinking of using 5 PCF8575 GPIO expanders with this code that allows for 8 encoders per board over i2c The...

Hey, I know this was a long time ago. But I'm embarking on a similar project, a midi ma3 fader wing. I'm hoping to do 3 banks of 5 non-motorized executor stacks in one box (to replicate compact xt / ma3 light) Just curious if you ended up completing this project and if you have any tips for...