Jmengel has built a USB charger from an old CD drive, a rubber band (from broccoli!), and a name badge strap. The device stretches when you breathe in and converts the motion into a five volt DC output.
The concept is simple but the making part is a little scary, involving the design of drive trains, circuit boards and lots of fiddly work. This first version only puts out 50mW, which means that you would take around a day to charge a cellphone, but the intention is noble, and there is a Version 2.0 on the way.
It's a great idea, but just isn't practical enough yet
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