Servo doesn't work after launching print
Hi, I built a 3 axis cnc-style drawing machine and I mounted a servo controlled grip in order to pick up and release different tools while drawing. The servo motor is independently powered by a 7805 chip that provide stable 5V 1.5A and connected to D11 as P0. When I check the servo from the LCD pad or from terminal it worsk fine and stable with M340 P0 S<500-2500> command but if I launch a print from SD or from a g-code sender it only set the first (at 500) position and moves anymore during the execution.
Since I don't use an actual extruder I set EXT0 with a fake thermistor (25°). I use EXT1 mirrored with Yaxis (in this case I had a problem with the FW setting of reverse direction but I solved reversing the wiring on ext1)
Servo support is enable. Z-probe disable(might be the reason? I haven't tried enable yet)
My configuration is: Arduino Mega 2560 + RAMPS 1.4 + DRV8825 + RepRapDiscount Full Graphic Smart Controller