OpenBuilds BlackBox provides a way of using an RC servo to raise/lower a pen, in Pen Plotter type applications

NB: Advanced functionality, requires you to install a custom version of Grbl-Servo

• Grbl Settings: Send $30=255 to adjust the scale to 0-255 (8 bit for Servos)
• GCODE: Send M3 Sxxx where xxx = 0-255 Absolute Position for the servo to move to
• You may need to add a G4 Pxxx dwell to allow the servo some time to reach the position before continuing with the GCODE

Please flash https://github.com/cprezzi/grbl-servo onto your BlackBox

TIP: Remove the Relay Mode jumper to prevent the relay from clicking on/off rapidly during servo operations