Hello people, on my arduino I can find the 'GND' label three times: http://arduino.cc/en/uploads/Main/ArduinoADK_R3_Front.jpg two side by side on the lower edge between 5V and Vin one of the upper edge between AREF and digital pin 13 I guess the upper GND is the groud for the digital signal pins…

3 x GND on Arduino ADK (solved)

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