An external power supply is connected to a pololu power switch. The power switch is then connected to pin 7 on the arduino and the external power connecter for the arduino board. A button, which is connected to the pololu power switch, is set to the normally open setting. When the button is pushed, the pololu switch is connected and supplies power to the arduino board. The sketch then displays a message on the LCD screen. After 10 seconds, pin 7 is set to HIGH, which turns the pololu switch off, severing the connection to the power supply and turning the arduino off.
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