Make: Maker Projects Guide

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Projects: ELECTRONICS

Garry McLeod

SECRET-KNOCK GUMBALL MACHINE

By Steve Hoefer

CANDY RAPPER—Make a cute candy vending machine that only dispenses treats when you knock the secret rhythm on its front panel.

One of the best things about exhibiting at Maker Faire is giving attendees a challenge. For the 2010 Maker Faire Bay Area, I decided to combine a past project of mine, a door lock that opens only when you give a secret knock, with a standard crowd pleaser: candy.

OPEN SEZ ME

Sweet, satisfying gumballs tempt passersby.

Rob Nance

A piezoelectric ...

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