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The Makey Makey board works on the principle of "closed-loop electrical conductivity," and detects changes in electrical conductivity when objects are connected to the board. These objects can include fruits, vegetables, coins, playdough, and even people.
Connect the Makey Makey board to a computer via USB, and then use a software program like Scratch to customize the keyboard or mouse inputs triggered by the objects.
Six alligator clips can be connected to various objects along with a ground connection. When an object connected to an input is touched or pressed, it completes the circuit and sends a signal to the computer via the USB cable.