A Knock-Activated Monster Box with a Randomized Lid
Mini Monster Box (Halloween Project)
Knock on the Mini Monster Box and a little monster peeks out. The lid opens and closes at random speeds and stays open for varying lengths of time.
Electronics maker Øyvind Nydal Dahl built it for his young daughter. A microphone detects the knock, while an Arduino and servo motor move the lid.
The same knock gets a different response. A little randomness gives a box a personality.