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remote_balloon_diagram.jpg

James writes in with this fun project he made to help him find his tent at a festival. I like the way he interfaced his indicator beacon to the cell phone. When the phone gets an incoming call, it lights up the screen, so he mounted a photoresistor right next to it. This allowed him to build a very simple analog circuit to control the whole thing. Nice hack!

If you used a pay-as-you phone for this, and hung up after a couple rings, it seems like this could be a really economical way to go.

This is what the completed project looks like:

remote_balloon_light.jpg

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