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--- docs:blackbox-x32:connect-rc-servo [2022/08/19 17:41]
127.0.0.1 external edit
+++ docs:blackbox-x32:connect-rc-servo [2025/04/01 18:30] (current)
admin
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 ===== 3.3.6 BlackBox X32 RC Servo =====
+You can connect a RC Microservo directly to BlackBox:
-OpenBuilds BlackBox provides a way of using an RC servo to raise/lower a pen, in Pen Plotter type applications
+=== Important note on current (amperage): ===
-NB: Advanced functionality, requires you to install a custom version of Grbl-Servo (Instructions below)
+Please note the BlackBox can only supply around **250mA** for powering micro servos etc.\\
+If you want to use a more heavy duty servo that may pull more than 250mA it would be recommended to use an external power source for the servo, otherwise you might damage the BlackBox
-  * 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
-==== Firmware ====
+=== Wiring ===
-Please install our CUSTOM GRBL firmware for 2 Axes + RC Servo to enable this Functionality
-  - Download, install and run OpenBuilds CONTROL
+OpenBuilds BlackBox provides support for using an RC servo to raise/lower a pen, in Pen Plotter type applications, or other imaginative uses
-  - Click on Wizards and Tools in the top Menu Bar > Grbl Flashing Tool
-  - Change Machine Type to 2 Axes + Servo
-  - Configure the other settings relevant to your machine, and Flash
-{{:docs:blackbox-x32:rcservo-flash.png?200|}}
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-==== Wiring ====
-> {{:docs:blackbox-x32:jumper-relayopen.png?150|}} TIP: Remove the Relay Mode jumper to prevent the relay from clicking on/off rapidly during servo PWM operations
+{{:docs:blackbox-x32:servo_2.6.png?600}}
-=== BlackBox version 2.6 and newer ===
+=== Configuration ===
+Make sure to set $33=50 in grblHAL settings (CONTROL > Grbl Settings Tab > Scroll down to $33 Spindle PWM Frequency > Set the value to '50' and Save
+TIP: Set $33=50 (PWM frequency), $34=5, $35=5 and $36=10 to generate a "standard" PWM signal: 20ms repetition rate, 1 - 2ms pulse length range. You may decrease $34 and $35 to output a shorter pulse than 1ms at min, and increase $36 to get a longer pulse than 2ms at max.
+For most standard RC Servos that have moves 180 degrees when $34 and $35 are set to 2 and $36 to 15 - resulting in a 0.4 - 3ms pulse witdh range.
+{{:docs:blackbox-x32:servo-pwm-freq.png}}
+=== Calibration ===
+OpenBuildsCONTROL includes a tool to calibrate the Pen Up / Pen Down positions of your Servo. Please perform this step prior to trying out the Pen Up / Down values, and also note down the S-Values as advised by the Calibration Tool to use in your CAM setups later on.
+Go to Wizards and Tools > Calibration > Calibrate Servo Pen Up / Down:
+{{:docs:blackbox-x32:servo-calibration.png}}
+=== Pen Control Buttons ===
+When $33 is set to 50hz, CONTROL will enable the Pen Up / Pen Down Buttons you can use to test you servo, check Pen Down positions to ensure your pen is touching the writing surface, etc
+{{:docs:blackbox-x32:servo-buttons.png}}
-{{:docs:blackbox-x32:servo_2.6.png?600|}}
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-=== BlackBox version 2.4 and 2.5 Only ===
-{{:docs:blackbox-x32:rcservo-wiring.png?800|}}
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