Phantom Quadrant presents:

Pump from the antique European lamps to your favorite brand of electrolyte mix, or to power the flow of city water. Bottle things in water, freeze them, and then either mail them or keep them as a power source for a microcontroller.

Instead of the straightforward analog approach, the Raspberry Pi can use up to five infrared LEDs to display a colored beam or a row of various icons: Things like traffic signs, phone numbers, store logos and more. But where the concept fits on a circuit board is much more than the number of LEDs. A set of four such LEDs can be configured in two-color stripes, a kind of geometric base color of sorts. Red LEDs appear in one color and white LEDs in another. This might be used to build music