On power up it randomly selects blue, yellow, or magenta and pulses that color. It can also be controlled by i2c.

wire address 0x55

Wire register map:

• 0 - mode
  • mode 0 is default powerslug mode and uses it's own values
  • mode 1 is blink mode
  • mode 2 is custom fade mode
  • mode 3 is gpio trigger.
    • allows turning led on and off using sao gpio_1
• 1 - red hex val
• 2 - green hex val
• 3 - blue hex val
• 4 - brightness
• 5 - pwm on time
• 6 - blink/fade duration lsb
• 7 - blink/fade duration msb

ISSUES: I did the current limiting resistor on the led all wrong, and only put a single 1kohm on the annode, when it really should have been a 220ohm on EACH cathode. It was to late to change the pcb's, so I just hacked together a deadbug style fix of through-hole 220ohm resistors wrapped around from the back to tie to the led's cathodes. It's ugly, but it works.

The "sparkfun Panalizer" addon I used in kicad did not transfer it's intent well to oshpark, so I have a bunch of pcb's stuck together that I'm going to have to dremel apart. You live you learn