Hi everyone,
I’m using an OpenBuilds BlackBox to run a pen plotter and having issues controlling the pen lift with an SG90 servo motor.
Setup:
- I’m using the latest version of OpenBuilds CONTROL.
- The pen plotter uses an SG90 servo motor for pen up/down.
- I’ve configured GRBL with laser mode enabled (
$32=1
) and set up PWM for the servo, but it’s not responding to G-code commands likeM280 P0 S90
(pen down) orM280 P0 S0
(pen up).
Issues:
- Servo Control: The servo doesn’t respond, despite correct wiring and settings.
- G-code for Pen Movement: Using Z-axis commands (
G0 Z5
for pen up,G0 Z0
for pen down) doesn’t work either. - Missing 2 Axes + Servo Option: The 2 Axes + Servo option is not available in the GRBL Flashing Tool under Wizards and Tools, even though I’m using the latest version.
What I’ve Tried:
- Manually sending G-code via the console.
- Ensuring the power supply provides enough power for the servo.
- Verifying GRBL settings for PWM control (
$9=1
,$33=50
,$30=255
,$32=1
).
Questions:
- Has anyone successfully controlled a servo motor for pen lifting on the BlackBox?
- Any additional GRBL settings I need to adjust?
- Why don’t I have the 2 Axes + Servo option, and how can I enable it?
Any help or suggestions would be greatly appreciated!