Added a power LEDthat is turned on when the system starts and goes off when the system enters standby #78
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The power LED is controlled by the code and connected to a digital pin of the arduino. This has the advantage that it can be turned off as soon as the stand by timer sends the system to stand by. If e.g. a power bank is used, the system will be powered until the power bank time out is reached but the LED will go off immediately.