Knock to open

a James Bond-worthy concept: knock on the door in a certain fashion, and the door'll open automatically. The idea was perfect: no need to drill holes, sneaky enough so the landlord wouldn't accidentally trigger it, easy enough to remember.The implementation was a bit more difficult: We needed something mechanical to open the lock from the inside and something to detect the knocks themselves. The first of the two wasn't too hard: the lock has a 'knob' on the inside, so you can lock and unlock the room from the inside without having the key. The second probably could be solved with a microphone, a small amplifier and a microcontroller to detect the knocks and see if they're in the right order.

Sprites mods - Knock to open - Intro

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