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Results tagged with Search options user 3666

Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

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I'd like to create a small device that can tell when it's near another created device or sensor. When it detects the other device, it lights up an LED. Maybe maximum detection range of a few feet. …
asked Mar 30 '11 by Tim Holt