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Rectenna Powers Carbon Monoxide Sensor

Accepted submission by Anonymous Coward at 2015-10-01 04:19:07
Hardware

An Anonymous Coward writes:

A crystal radio set [wikipedia.org] has no battery: its antenna collects radio waves as an alternating current, and its diode makes direct current which makes sound in an earphone.

Freevolt [engadget.com] is a device which works on the same principle, turning radio frequencies such as those from mobile phone transmitters, TV broadcasts, or Wi-Fi into direct current. It can provide 100 µW of power, enough to operate a carbon monoxide detector. The maker is accepting pre-orders for a developer kit.

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