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AlvaEdison

Servo Touch - Z Probe for Ender 3 - option to BLTouch

by AlvaEdison Jul 30, 2019
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Hello
how did you mount the bracket to the petsfang bullseye as shown in the video?

Hello, what are you setting in the firmware related to the servo? I have already an BLTOUCH adapter that give pin27 without cutting the buzzer wire. How did you set it up?

I have a SKR v1.3 board. This board have a separate servo connector.

define Z_PROBE_SERVO_NR 0 // Defaults to SERVO 0 connector.

define Z_SERVO_ANGLES {110,35} // Z Servo Deploy and Stow angles

define X_PROBE_OFFSET_FROM_EXTRUDER -41.7 // X offset: -left +right [of the nozzle]

define Y_PROBE_OFFSET_FROM_EXTRUDER -4 // Y offset: -front +behind [the nozzle]

define Z_PROBE_OFFSET_FROM_EXTRUDER -3.05 // Z offset: -below +above [the nozzle]

define NUM_SERVOS 1 // Servo index starts with 0 for M280 command

// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
// 300ms is a good value but you can try less delay.
// If the servo can't reach the requested position, increase it.

define SERVO_DELAY { 500 }

// Only power servos during movement, otherwise leave off to prevent jitter
//#define DEACTIVATE_SERVOS_AFTER_MOVE

// Allow servo angle to be edited and saved to EEPROM

define EDITABLE_SERVO_ANGLES

The servo seems to work now. The only problem is that deploy and stow are backwards for me .. any idea ? switching this values had no effect Z_SERVO_ANGLES {110,35}

EDIT: Looking at the code i found that exist command M281 that is not documented in the marlin repo.
https://github.com/MarlinFirmware/Marlin/issues/14392

The code is:
SERIAL_ECHOLNPAIR(" M281 P", int(i), " L", servo_angles[i][0], " U", servo_angles[i][1]);
default: break;

And it seems that L is for the deployed probe and U for the stow position

Thank you mate. I'm using too and SKR but it's the MINI E3 (with 2209 made for the ender 3). I didnt know about the servo pins and instead i was using the old pin27 connector that i got with a crappy 3dtouch.
Now that i connected it to the servo port (not backward) it produce the same strange behavior as the pin 27 method.
When i run a command (G20 o M280 P0 S100) that involves the servo i can hear a snall buzz from underneath the lcd screen and the servo don't move. Any suggestion?
I was following this instructions.. do you something that can lead me off ? https://www.thingiverse.com/thing:3293821

Under $10 DIY Auto Bed leveling Z-Probe for Creality Ender 3

ok, i figure it out. since i consider myself not THAT stupid i checked out the pin setup of the board and i discovered that they decided to use a "non standard" wire configuration for the servon pinout !! https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/blob/master/hardware/BIGTREETECH-SKR-mini-E3%20V1.0/SKR-mini-E3-PIN.pdf

What is the best mount for a stock Ender 3 to go with this one?

Hi GreyShip,
I added a Bracket for the stock Ender 3. Please try it and give feedback.

I will see what i can do for you, but probably you have to wait for the weekend. Sorry