nuno keyboard is MIDI keyboard for M5Stack
hands-on event:
https://enebular.connpass.com/event/122739/
https://enebular.connpass.com/event/132544/
blog:
https://note.mu/kitazaki/n/n2a1dd40f820a
presentation:
https://www.slideshare.net/kitazaki/20190731-enebular-meetup-vol13-by-kitazaki-v1