Thank you, that was very informative. Right now I'm working on the web page for using the arduino as a SERVER, just because I'm building a 4 wheel vehicle that will be operating at about 10 times the speed of the rover. If you have a large area you want to cover with the rover I'd look into an ubiquiti system. http://www.ubnt.com/ We have one that covers about a 1 mile radius if there are no obstructances. And if your ping board has 4 wires instead of the Arduino guide's 3, find the revised NewPing sketch.