⚙ Development Guide > SDK > Concept Guide

Robotic Arm States and Light Effects

State	Light Effect
Self-test in progress	Solid yellow
Self-test complete; calibration required	Flashing yellow
Self-test incomplete; an error prevents startup	Solid red
Self-test complete; waiting for USB connection	Solid white
USB connected; waiting for control service to start	Pulsing white
USB connected; control service initializing	Green wave
USB connected; control service started and ready to accept external commands	Solid green
Gravity-compensation mode	Pulsing purple