The DIY clip tells fans to make their own patterns by hand first or print them if need be. After sizing the button itself, fans will have to sew in a pin if they want to wear the button.

The device uses every single pin on an ATtiny88, and because each button gets its own pin the keypresses can be detected with pin-change interrupts.

A couple of years ago, a tech gadget team created Pressy, an external button for your smartphone that could placed in the headphone jack and remapped for different uses. The button lets you ...