Here’s a little thing I made for Emma from experience.
are you making these sell-able, as in already built and able to ship to the U.S.?
Thanks for your interest Jonah! This is a one-off unfortunately, but there’s enough information on this page for a DIY electronics enthusiast to duplicate my work.
I’m temporarily out of of the electronics game while I work on this piece of software that’s going to change the world, but if you want to find someone to build you one, try posting a message on tindie or hackaday.
Hope this helps