Today, I learned about basic circuits, some Arduino programming, and did a little experimenting with LEDs. The most basic circuit I made was taking an LED, and holding it to a watch battery. Positive charge flows in one end, negative charge in another, and the circuit is completed, the LED lights up. We did some more complicated LED lighting with an Arduino and a breadboard. By attaching the LED to a circuit capable of creating new circuits within itself, we got a multi-colored LED to light up different colors in succession.