Let this Instructables project by 14-year-old whiz-kid Quin Etnyre, who uses the Qtechknow pseudonym on the site and as the name of his business, convert your house locks to a NFC system. The easy-to-make, keyless entry system features 3D printed parts and an Arduino-compatible, compact Qduino Mini, which senses when there is an NFC tag present and unlocks your door using a servo. Check out details about the project in the full article: http://3dprint.com/53583/nfc-door-lock-qduino-mini/


Below is a photo of the lock system on a door: