What can you do with Tweet-a-watt? Many things, not the least of which include monitoring your domestic power usage without having to hack your main power grid (handy, especially if you’re a renter). The Tweet-a-watt automatically uploads the data to your Twitter account for sharing, competing or bragging. There’s nothing like a little public accountability to keep us all honest!
Designed by MIT graduate and open-source maven Lima of ladyada, Tweet-a-watt is an open-source hack with a green heart. You can make your own Tweet-a-watt by opening up an off-the-shelf Kill-a-Watt power monitor and making a couple simple modifications - wire an Xbee wirelss module, super capacitor and transmission indicators to the power sensor output, then syc it to an Xbee reciever connected to your PC via USB. Clear as mud? Never fear, Ladyada.net has all the details mapped out nicely — with diagrams !