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Discussion in 'General Questions' started by joea, Nov 16, 2019.
From time to time I see Red or Green LED flashes at the USB connector port.
What do they signify?
Communication - normal
They are the LEDs from the Arduino.
Red is normally power and green is just (by default) an activity LED*. I can't recall if Marlin uses them in some other way, but it is normal to see them blinking.
*Robo used Chinese clone mega boards and some of those used different colors so Red might be activity and Green power.