* '''Red #13 LED''' - this LED does double duty. Its connected with a series resistor to the digital #13 GPIO pin. It pulses or blinks nicely when the Pro Trinket is in bootloader mode, and its also handy for when you want an indicator LED. | * '''Red #13 LED''' - this LED does double duty. Its connected with a series resistor to the digital #13 GPIO pin. It pulses or blinks nicely when the Pro Trinket is in bootloader mode, and its also handy for when you want an indicator LED. |