Use the LEDs to indicate when face detect is running and detecting
Use the LEDs to indicate when face detect is running and detecting

The privacy LED turns on while inferencing is running, and when it
detects a face, the button's LED turns white.

This is helpful for demos because you otherwise don't know when the
model is running, let alone detecting a face because the preview
screen covers the terminal window.

google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian,google/aiyprojects-raspbian