Wingardium Leviosa - The Floating Feather
Published on November 4, 2016
Using a tethered DC motor and the Bluetooth LE component, make a feather quill pen, or anything else, magically float into the air and come back down!
The circuit is based on the new Gadgets & Gizmos Kit 2nd Edition, using the Bluetooth LE coponent to let you control via a smartphone whether the feather floats up or down. We attached it to a tethered DC motor, switched to "variable", and then put a big Lego wheel on the end (larger than a "normal" Lego wheel, but smaller than the wheel that comes with the kit). The size of the wheel makes all the difference for how fast the object will rise and fall.
Place the circuit somewhere up high and tie or it down so it doesn't move. Affix some fishing wire or another kind of "invisible" string to the wheel and your object, then connect to the bluetooth piece. Using the Slider control, you can then make your feather rise up and float back down!