low-frequency
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Text your friends even when you don't have service
Ever needed to send a message to a friend from the boonies? A company called goTenna has just launched a device that connects to your phone via Bluetooth and turns it into a low-frequency radio with a range of several miles (up to 50 miles). Using an iOS or Android app, that'll let you text or share GPS locations (no voice calls) over an unlimited, free ad hoc network with other goTenna users. The team behind it says that everything is encoded, and the app will automatically retry until your message goes through -- in case you're hiking in difficult terrain, for instance. The company's planning on selling a limited number for $150 per pair on its site to raise $50,000 in funding -- after that, it'll run $300.
Purdue University creates 'bass' powered medical implant, knows where it hertz
We've seen all kinds of medical implants over the years, but none that had a musical preference -- until now. Researchers at Purdue University have created a pressure sensitive microelectromechanical system (MEMS) that uses sound waves as an energy source. The proof-of-concept has a vibrating cantilever that's receptive to sound -- or music -- in the 200 - 500Hz frequency spectrum, which is towards the bottom end of the audible range. The subcutaneous implant converts the low-frequency vibrations into energy, and then stores it in a capacitor. Once the cantilever stops vibrating, it sends an electrical charge to a sensor and takes a pressure reading, the result is then transmitted out via radio waves for monitoring purposes. The immediate real world applications include diagnosing and treating incontinence, but we're already wondering if that self-powering mp3 player implant could finally become a reality?
