@Benjamin-Rau From looking at the schematics for the Adafruit PowerBost (https://learn.adafruit.com/downloads/pdf/adafruit-powerboost.pdf), its LB LED would be turned on if the LBO line is driven/held low. Are you sure that your Omega GPIO pin is configured as an INPUT? Additionally, the Application Schematic for the TPS61090 chip used in the PowerBoost indicates that a pull-up resistor should be used on the LBO line (see http://www.ti.com/lit/ds/symlink/tps61090.pdf). There is no such pull-up in the PowerBoost schematics I would suggest a pull-up resistor on the GPIO pin used for the LBO - I guess around 10K Ohm should do.