Secret Knock Box
thingiverse
The MYSTERY KNOCK BOX is a treasured keepsake box that only swings open when its rightful owner taps their personalized secret knock. This unique knock can be reprogrammed instantly to suit changing tastes. The box relies on three dependable AAA batteries, and employs an Arduino Pro Mini, a piezo pickup (knock sensor), a sub micro servo (latch release mechanism), and custom 3D printed and laser-cut components. The Arduino code contains clever modifications from Steve Hoefer's Secret-Knock Gumball Machine project, used with gratitude. Steve's ingenious Gumball Machine was the very first Arduino project my kids and I constructed together, opening doors to many thrilling family projects over the years. Thanks to Steve for sparking our creativity! A comprehensive build guide is available for download at https://fabforgefive.com/mystery-knock
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