Datasheet

Green ON LED

To the left of the USB connector. This LED lets you

know that the CPX is powered on. If it's lit, power is

good! If it's dim, flickering or off, there's a power

problem and you will have problems. You can't disable

this light, but you

can

cover it with electrical tape if you

want to make it black.

Red #13 LED

To the right of the USB connector. This LED does

double duty. Its connected with a series resistor to the

digital #13 GPIO pin. It pulses nicely when the CPX is in

bootloader mode, and its also handy for when you want

an indicator LED. Many first projects blink this LED to

prove that programming worked.