Servo not working on CNC Shield V4

[EranIDar]

Hi !

I'm creating a CNC Plotter with 2 Bipolar Steppers for X & Y and a servo as a Z axis for the pen.

I bought a CNC Shield V4 (link) on banggood. Disclaimer : don't buy this board, it's full of bugs.

I installed grbl on the Arduino Nano and did the following things :

• In cpu_map.h : Invert the pinout between X_STEP_BIT, Y_STEP_BIT Z_STEP_BIT and X_DIRECTION_BIT, Y_DIRECTION_BIT, Z_DIRECTION_BIT (as I said this board is garbage 😂, they even failed for that)
• In config.h : comment VARIABLE_SPINDLE to disable it

So I have connected the servo on Z+ which is connected to pin 11 of the Nano. And in Universal Gcode Sender, I enter the commands "M3" or "M5" but the servo is not moving at all. I tried with grbl 1.1f and 1.1h

I've already tested my servo on the pin 11 of a spare Arduino Nano, it works fine.

Do you have any ideas or something I have missed...

Thank you,

[EranIDar]

Here are my parameters :

$0 = 10 (Step pulse time, microseconds)
$1 = 25 (Step idle delay, milliseconds)
$2 = 0 (Step pulse invert, mask)
$3 = 0 (Step direction invert, mask)
$4 = 0 (Invert step enable pin, boolean)
$5 = 0 (Invert limit pins, boolean)
$6 = 0 (Invert probe pin, boolean)
$10 = 1 (Status report options, mask)
$11 = 0.010 (Junction deviation, millimeters)
$12 = 0.002 (Arc tolerance, millimeters)
$13 = 0 (Report in inches, boolean)
$20 = 0 (Soft limits enable, boolean)
$21 = 0 (Hard limits enable, boolean)
$22 = 0 (Homing cycle enable, boolean)
$23 = 0 (Homing direction invert, mask)
$24 = 25.000 (Homing locate feed rate, mm/min)
$25 = 500.000 (Homing search seek rate, mm/min)
$26 = 250 (Homing switch debounce delay, milliseconds)
$27 = 1.000 (Homing switch pull-off distance, millimeters)
$30 = 1000 (Maximum spindle speed, RPM)
$31 = 0 (Minimum spindle speed, RPM)
$32 = 0 (Laser-mode enable, boolean)
$100 = 400.000 (X-axis travel resolution, step/mm)
$101 = 400.000 (Y-axis travel resolution, step/mm)
$102 = 250.000 (Z-axis travel resolution, step/mm)
$110 = 500.000 (X-axis maximum rate, mm/min)
$111 = 500.000 (Y-axis maximum rate, mm/min)
$112 = 500.000 (Z-axis maximum rate, mm/min)
$120 = 10.000 (X-axis acceleration, mm/sec^2)
$121 = 10.000 (Y-axis acceleration, mm/sec^2)
$122 = 10.000 (Z-axis acceleration, mm/sec^2)
$130 = 200.000 (X-axis maximum travel, millimeters)
$131 = 200.000 (Y-axis maximum travel, millimeters)
$132 = 200.000 (Z-axis maximum travel, millimeters)

[ardmed]

hi guys me to have the same problem , first time working well
but now nor working
grbl-servo-master
cnc shield v3
2 motors onw servo SG09

[EranIDar]

I managed to make it work !!!

Because I tried several repo (grbl, grbl-servo, Grbl Pen Servo) and I added this libraries into Arduino there was a mix of files (really weird). So I removed all the other grbl libraries except Grbl Pen servo and it worked like a charm !