OpenBuilds Documentation

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 (Instructions below)

• Grbl Settings: Send $31=255 to adjust the PWM 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 install our CUSTOM GRBL firmware for 2 Axes + RC Servo to enable this Functionality

1. Download, install and run OpenBuilds CONTROL
2. Click on Wizards and Tools in the top Menu Bar > Grbl Flashing Tool
3. Change Machine Type to 2 Axes + Servo
4. Configure the other settings relevant to your machine, and Flash

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