johnkeefe.net

I wanted my Arduino on the internet.

There are lots of new internet-friendly, Arduino-esque objects, such as the Spark Core. And those are cool.

But getting a plain ol’ Arduino Uno onto the web has been hard. I’ve tried repeatedly. And I have failed. Repeatedly.

This week, I gave it one last try. And I won.

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I can sniff the air and know if you are near.

Your phone’s wifi system transmits periodic “pings” in search of connection points. Those pings contain a set of numbers unique to your phone — its MAC address, or media access control address.

And I can see them.

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