[question] I have a RRD ramps + arduino + LCD shield. If i plug the usb cable i can see things in the LCD, if i unplug it just haves a dull backlight. I can see the arduino led on, so its on. If i move the encoder i can hear the buzzer. Any hint?, i wanna go computer less printing with that printer.
It doesnt matter if i connect 12v to the arduino or if it gets the power through the ramps.