Led Lights indicator
In the Schematic I see 4 led lights. LED_1 to 4. What indicate? I see also are connected to the digital pins 3, 4, 5, and 6. Can I use those to indicate which filament is been used? I'm setup with Arduino r3 with CNC Shield V3. Bos motors are working perfect. Now I'm doing the final setup running MK4.
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Those 4 LEDs were specifically intended to indicate which was the active filament. All you need to do is enable those for pins as outputs and set the one high for the active filament.
Bill