This DIY lockbox has no keyhole or keypad — just a hidden magnetic sensor array that unlocks when you trace the right secret ...
IEEE Spectrum on MSN
Build a hidden lock with a magnetic imager
Only the right gesture can open it ...
Over on IEEE Spectrum, [Stephen Cass] has a project that would probably have seemed like a magic a few centuries ago. Imagine a box that uses a magnetic device to holds a locking bolt, requiring a ...
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