The positive lead is un used, perhaps for a later experiment. The 560 ohm resistor connects the "Positive" end (the Anode) to pin 13 on the Arduino and ground is the return path for the current sourced to pin 13 current for the LED.
Doc
The positive lead is un used, perhaps for a later experiment. The 560 ohm resistor connects the "Positive" end (the Anode) to pin 13 on the Arduino and ground is the return path for the current sourced to pin 13 current for the LED.
Doc