Just came across this:
Basically 90 red LEDs with an STM controller, audio sensor, and a small cr2032 battery. On each ear.
If we had some tiny batteries and a sensor board for the Pico…
Batteries are an interesting problem for jewelery. The CR2032 cell they’re using is roughly the size of two stacked US quarters, but slightly lighter in weight.
I’ve done piano and sound for tons of musical theater – wonder if you could steal a trick that we used for microphones from that universe and hide the batteries and controller in a larger, showy hair accessory.