In Frozen 2, a key plot point is the idea presented by everyone's favorite snowman, Olaf. He tells us that water has memory. That is a concept that has been around for a while and, while I am not one ...

But how to make it all work? An ESP32 did the trick. While the project’s name–Olaf–sounds like it was from Frozen, according to the GitHub page it actually means Overly Lightweight Acoustic ...