If you just wait around long enough, the future becomes the past. And that’s happened to the “Back to the Future” future, as you probably all remember. But BttF-themed projects are still pouring in.
[ossum] sent us the link for his build of Doc Brown’s briefcase that only opens above 88 mph. His writeup is fantastically detailed, and worth a look if you’re interested in working with a GPS unit and microcontrollers, driving seven-segment LEDs with shift registers, or just driving too fast in an old Jetta. And there’s a video demo just below the break if you’re not a believer.
We’ve seen a lot of reverse geocaching lock boxes that only open up when you’re in the right place. This hack is the first that we’ve seen taking the first derivative. See where we’re going with this? Who will be the first to build a GPS acceleration-based lock? (Don’t get us started on jerk.)