I have a few Arduino's along with XBee Shields communicating with one another.
The problem I'm having is that, when all the Arduinos+XBee Shields are powered via USB(PC) they seem to work fine and all transmissions get through to one another. But, when I use them with 9Volt batteries(fairly new batteries) the whole thing crashes and I never receive responses back from the battery powered ones.
I'm wondering if this is really a power issue? wouldn't a 9volt be enough to power a single arduino(uno)+xbee shield?