Tag Archives: NFC Car Door

Unlock your car door with a fistbump


Maker Pierre Charlier shows how he was able to add NFC control to his car door with a KeyDuino.


In the year 2016, the idea of having to use an actual key to lock and unlock your car is as obsolete as listening to a cassette tape. Pretty much every vehicle these days comes with a remote, which lets you wirelessly control your doors from afar. Not to mention, some whips can even sense when you’re in close proximity and automatically unlock as you approach.

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Pierre Charlier, on the hand, decided to retrofit his old ride with a KeyDuino and a relay shield, which enabled him to experience keyless entry in the form of a fistbump via an NFC ring. To accomplish this, the Maker removed his car’s internal lock switch and modified the wire harness to take the connection to the ‘duino. For a permanent 12V power supply, he plugged a wire directly on a fuse and another to the ground of the vehicle. (However, it should be noted that connections differ from car to car.)

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As you can see in the video below, the system also works with a smartphone for those who rather not wear a ring. Charlier has shared all of the code and a step-by-step breakdown of the project for those interested in adding NFC-enabled entry to your set of wheels. Looking ahead, the Maker hopes to have an improved prototype with a BLE+NFC board right on the door handle.

The brainchild of Charlier himself, KeyDuino is Arduino-like board with built-in NFC capabilities that was successfully launched on Kickstarter late last year. Based on the ATmega32U4, the KeyDuino shares pretty much the same form factor and DNA as the Leonardo, and is compatible with most shields.