The Arduino is a tiny, low-cost microprocessor that can be programmed to operate virtually anything you can think of. As you'll see, the Arduino may be used to construct a variety of projects, including a ghost detector, a joystick-controlled laser, an electronic dice, a laser tripwire alarm, a motion sensor alarm, a keypad entry system, and more. All of these projects are simple to construct and have one feature: they all take advantage of Arduino's capabilities.The sketches are available at No Starch if you don't want to input that much code.
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