The Tweet-a-Watt is one such example. Using a modified version of a $20 off-the-shelf wattage meter, the Tweet-a-Watt kit, now available online for $90, tracks daily power usage for an outlet. It then reports that information back to your followers via your Twitter account, including the daily average and your daily goal.
The kit includes the wireless transmitters and receivers needed to report the data, plus cables and various components needed to get it all wired up. It's the product of an open-source hardware project that had the main goal of wirelessly tracking power usage for a household. The Twitter aspect is a fun byproduct of this idea.
For DIY'ers, there are instructions for making your own kit and links to download the software for your project.
It's great for people who want to keep track of their carbon footprint, and even better for those who like to show off their conservation efforts to their fellow smug friends. You know they're out there.
The meter tracks a specific outlet, though you can buy multiple kits for other outlets and have them all report to the same Twitter feed (that seems excessive). I'd love to see a kit like this for household power, maybe something you plug in at the main terminal for your house. Or maybe I could just bypass Twitter and give my apartment its own blog? I'm sure it's got wonderful things to say about me.
http://news.cnet.com/8301-17938_105-10205534-1.html
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