3 x GND on Arduino ADK (solved)

Projects General Guidance
1

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.
The two lower GND's are the ground for each 3.3V and 5V ?

But which one is for 3.3V and which one for 5V, if so?

I appreciate any help. Thanks in adivse, yours
Murat

2

They are all connected. It doesn't matter which you use.

3

The GNDs are common. They are all connected and can all be used for either 5V or 3.3V.

4

Oh, good to know.

Thank both of you..