We had email a couple of weeks ago from José Federico Ramos Ortega, who has prepared a video and tutorial about the HAT (which he calls a Sombrero Capacitivo) in Spanish. Extra points for the use of cactus fruit to change instrument.
You can get your hands on one of these at Adafruit, who, despite the name, do not sell the fruit required to build a fruit piano of your own, but who do sell everything else. Lettuce turnip the beet!
Friday, August 28, 2015
Capacitive touch HAT from Adafruit
at 3:45 AM