RedBoard Edge Hookup Guide is confusing.
When the Hookup guide discusses analog pins, it says ALL EIGHT pins can also be used as digital I/O. Then just below the pic it says taht A6 and A7 can only be used for analog. Then it specifically goes on to say they can’t be used for digital READ…but doesn’t mention digital WRITE. Can someone clarify this?
Looks like we had an error in that [guide and it’s been updated to reflect this.
Pins A0-A5 are analog in, OR digital read / write capable. (They can’t be analog and digital at the same time.)
A6 and A7 are analog in only.
Hope this helps!](https://learn.sparkfun.com/tutorials/redboard-edge-hookup-guide)
great thanks
I’ve got another question on this board. Might be a RedBoard Edge issue only, or might be an issue for all RedBoards. I’ve found that when I’m plugged into the board on USB things run great. As soon as I try to power off of the barrel jack or power in ports (no USB connection to computer) I have pretty significant run-ability issues. Has anyone ever seen this?
What kind of issues are you seeing?
The RedBoard Edge and our other ATmega328 based RedBoards boards don’t really know where they are getting power from, just that power is available. Sketches won’t know you’re using the barrel jack over the USB port unless they are waiting for some input from serial USB that’s absent if you’re not connected.
I get issues like pins not being at 0V (motors going the opposite direction). Then I plug into the board with USB and it all goes away.
The board itself wouldn’t be doing that.
The only thing I can think of is you may have a grounding issue where some of your components are grounded through the USB cable and the others are grounded through the GND pads on the Edge. Make sure all your grounds are connected to GND and see if that helps.
i’ll do that, thanks chris