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Makey Makey: An Invention Kit for Everyone is an invention kit designed to connect everyday objects to computer keys by completing closed loop electrical signals to send keyboard or mouse inputs. The Makey Makey can be used in conjunction with Scratch, with or without the Makey Makey extension.
The Makey Makey is designed to port electrical circuits to computer keys. The keys most accessible from the front side are the arrow keys, space bar, and left mouse click. For example, a circuit loop could be connected to the space bar, then a Scratch project could play a sound:
when [space v] key pressed::makeymakey start sound (buzzer v)