Just about every “getting started with microcontrollers” kit, Arduino or otherwise, includes an ultrasonic distance sensor ...
Abstract: Passive bistatic radar (PBR) employs an ambient source of radio frequency (RF) energy, such as a television transmitter, as an illuminator. The continuous nature of such transmissions ...
Santa Net is an annual December event where licensed amateur radio operators use RF and EchoLink technology to connect children with Santa Claus on the airwaves.
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