Strictly speaking, a Theremin uses a pair of antennae that act as capacitors in a specific R/C circuit. Looking at ...

For the physical feedback, Denver has made some vibrating boxes that you put in your pockets. An Arduino polls the ultrasonic sensors and provides feedback via the boxes. This completely frees up the ...

Sonair is using the 3D ultrasound sensors exclusively licenced from MiNaLab to enable autonomous robots to see and make the right decisions.