xonoxitron/casio-f91-w-contactless-nfc

Bringing NFC contactless payment capability to a true classic.

How I Hacked CASIO F-91W digital watch

Bringing NFC contactless payment capability to a true classic

Full article here: https://medium.com/@matteo.pisani.91/how-i-hacked-casio-f-91w-digital-watch-892bd519bd15.