5V IN/OUT in an Arduino stack

Q&A forumCategory: Questions5V IN/OUT in an Arduino stack
vvlachak asked 2 weeks ago

I read this part of the simpleRTK2B V3 hookup guide

  • 5V IN/OUT:
    • When the LED next to this pin is OFF, can power simpleRTK2B V3 from this pin.
      For example, just plug it on top of an Arduino UNO board, and simpleRTK2B V3 will turn ON.
    • Alternatively, you can now use simpleRTK2B V3 to power shield board.
      Just turn ON the switch “5V=OUTPUT” and simpleRTK2B board will output 5V at this pin.

My question is:
What should be the selection of this switch in case we want to create a stack? (see following example)
On the top: A Third party shield (e.g., touch screen)
          GRD   |              | 5V
In the middle: The simpleRTK2B V3
          GRD   |              | 5V
On the bottom: An Arduino UNO   
          GRD   |              | 5V
              POWER SOURCE
Thanks in advance,

Ardusimple Staff replied 2 weeks ago

Hi vvlachak,
Thank you for asking.
If you use an arduino UNO in the stack, the arduino UNO will be powering the system. In this case you need to have the switch at 5V = INPUT, otherwise both simpleRTK2B V3 and arduino UNO will be trying to give power to each other.

vvlachak replied 2 weeks ago

Thanks for the answer.
Have a nice week.
Best regards,