But the “R” in radar still stands for “Radio,” and RF projects are ... subbing in ultrasonic sensors is how [Dzl] built this sonar imaging system using a lot of radar principles.

Enclosed are the ultrasonic ... sensor and an LED indicating the power status. On the other side of the CAT5 cable can be found an Arduino compatible board with an XBee shield and a 9V battery ...

A DIY The Wrench maker has built a smart desk dustbin with an automatic iris-style lid, adding both functionality and a ...