I2C to a completely new device
Adafruit has created these amazing devices. They call them SeeSaw and they come in three flavors, each for a different specie of ATtiny. And this is one of them, Adafruit ATtiny817 Breakout with seesaw - STEMMA QT / Qwiic they've created an interesting series of examples for them. In Python3 and in that peculiar language that the Arduino uses. I'm convinced that if the languages that the Prop1 uses could be appropriately worked into to use that thing, it would greatly extend the usefulness of the Prop1. I believe a Python dialect was explored for the Prop2, but, ah, I do not have any of those devices living here at the moment.
Two Mascots watching.