The UFO Light
It uses two QT113 passive proximity sensors (the small black chips on the breadboard). They use the capacitance of our bodies to trigger an “on” signal. We attached a wire to each one and soldered small squares of copper mesh to the ends of the wire. The mesh extension on the wire increases its sensory range. This allows the user to trigger the sensor by touching the plexi (even though it does not conduct electricity. The LED ring around the bottom, along with music playing through an attached computer, gets triggered by the sensors.
My next goal is to use a relay to have the sensors trigger higher voltage objects – namely a manequin wrapped in Christmas lights.