The whole point of gaining the distant unlock ability for our cars was to prevent us from suffering the indignity of standing there in the rain, working a key into the lock while the groceries become soaked. [Mattia Dal Ben] reports that even Teslas get the blues and don’t unlock reliably all the time, in spite of the cost .
[Mattia] determined that a spare key card might be useful to have about, and that building it in to his Casio F-91W watch would place the crucial as close at hand as it could be without having an implant.
After designing a new J3A040-CL primary card to match the car, getting the chip out was the simple part — simply put it in acetone till you can peel the layers apart. Subsequently [Mattia] assembled a fresh antenna for it and wound it round the interior of a 3D printed rear plate.
The hardest part seems to be the leaning the eye antenna into the resonant frequency anticipated by the car-side antenna. [Mattia] found that a great deal of things jumble with all the resonant frequency — the watch PCB, casing, and even the very small screws holding the item together each drove off it a small bit.
Since the watch is less comfortable now, [Mattia] thought of building a new spine from translucent resin, which seems wonderful for us. It looks like the new strategy would be to transfer it into the front of the watch, with a resin window to show off the processor. That seems pretty good, too. Have a look at the secret unlocking power following the fracture.
Casio watches are great, though we’re more into the calculator models. Someone out there enjoys their F-91W so much they made a giant wall clock variation .
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