[AndyGadget] built a haunted box as part of his Halloween preparations. This follows in the footsteps of the Knock Block we saw earlier this month but makes several hardware changes. He’s replaced the solenoid with a DC motor that rotates an arm to do the knocking. He’s avoided any CNC work by using a softwood box from a craft store as the enclosure. For control circuitry he’s used an 8-pin PICAXE Microcontroller that ‘listens’ for knocking on the box via a piezo buzzer. It will mimic knocks back to you, and if it hears the right combination The Addams Family theme song is played. This useless machine will make a great office conversation piece and with this simplified design it’s much easier to build than the Knock Block. See it perform after the break.

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