I'll add my $.02. This shield may be a perfectly good piece of hardware, but the software is just barely functional. After experimenting with it on both an Uno, it became pretty clear that the TCP/IP stack consistently runs out of memory. Only the very most basic sketch using a completely stripped down set of libraries can run. Trying to do anything useful overruns RAM and crashes/resets the Uno. I even went as far as to get a Mega to try things with more RAM. It does require some playing games with jumpers to get the pins on the shield to match up with the slightly non-standard Mega config, but even after that, it still failed to run for very long before resetting.This is incredibly frustrating because there really doesn't seem to be a viable, functional WiFi shield for Arduino. I don't know why no one has produced one yet. Using an ethernet shield with an external router or WiFi bridge is just not an option for a mobile system, so I wish people would not always assume that their hard-wired, tethered, nailed to a wall socket solution is the only way to get wireless connectivity. Totally defeats the purpose of "wireless" to require a box that has to be plugged in to do WiFi...
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