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Step 2Arduino
What's an Arduino? ...and how do you pronounce that, anyway?
An Arduino is a microcontroller. It plugs into a computer with a USB cord. On the Arduino board, shown below, there is an ATMega328 microchip, as well as 14 digital input/outputs, 6 analog inputs, and a USB port.
That's not all, but it's everything that you will need to know about, to build a sentry gun. For complete details on the Arduino board, go to http://arduino.cc/en/Main/ArduinoBoardUno.
You will use the Arduino board to take commands from the computer, and drive the servo motors as the commands dictate. Also, it will provide you with hookups for expanding your own ciruit easily afterwards.
Where to buy your own Arduino board
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