diy projects
Hidden Lockbox Opens Only to a Secret Magnet Gesture
No keyhole, no keypad: a Teensy 4.1 and an 8x8 Hall-sensor grid unlock this wooden box only when you trace the right magnetic gesture.
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No keyhole, no keypad: a Teensy 4.1 and an 8x8 Hall-sensor grid unlock this wooden box only when you trace the right magnetic gesture.