[comboy]

I mean, you have to connect the MCU to your thing somehow, that's building a circuit, so you just insert the level shifty thingy between. But I have no clue about your seemingly highly specialized use case (which, why arduino of all things), so presumably you know better.

[wmlavender]

If I can find a 5 volt compatible device that does what we need, then why would I even bother looking at 3.3 volt devices?