Expression Pedal TRS Input Requirements

bmoe24x:
Somewhat of a side note, should the arduino/my desktop usb port be able to handle half a dozen leds, the board, the expression pedal power wise? I was hoping to only have a single (micro usb) cable running to the board? (I plan on trying to check the current usage on a DMM when all my parts arrive)

A few LEDs won't be an issue.