Connecting a BLTouch to an SKR E3 Turbo | RepRapFirmware for LPC and STM32

How to connect a BLTouch to an SKR E3 Turbo

Physical Connections

Connect the BLTouch to the SKR E3 Turbo as described in the table below.

BLTouch Wire Colour	SKR E3 Turbo	SKR E3 Turbo Pin Name
Brown	GND
Red	+5v
Yellow	1.23	Servo0
Black	GND
White	1.22	probe

Config.g Changes

Your config.g should be modified as below.

M558 P9 H6 F120 T8000 C"^probe"       ; set Z probe type to bltouch and the dive height + speeds
M950 S0 C"servo0"                              ; Setup servo 0 as servo port on SKR E3 Turbo

You will also need to set up your probe offset using G31 and your mesh probing grid

Files to Create

Create the following files.

Tip: If you select the BLTouch while setting up your config.g files using the Configurator, these files should be created for you. We still advise checking them tho ensure the content is correct.

deployprobe.g
retractprobe.g

Create a file in your sys folder called

deployprobe.g

In it, paste the following code

M280 P0 S10

Create a file in your sys folder called

retractprobe.g

In it, paste the following code

M280 P0 S90

Files to Modify

Tip: If you select the BLTouch while setting up your config.g files using the Configurator, these files should be modified for you. We still advise checking them tho ensure the content is correct.

If you you want to use your probe as your z endstop, you need to modify your homeall.g/homedelta.g and homez.g

homez.g
homeall.g

For homez.g, you will have need to have something similar to this. Please modify the co-ordinates required for the centre of your bed accordingly.

; ################# Home Z Preparation ################

G91 															; Relative mode
G1 H2 Z5 F5000													; Lower the bed
G90																; Back to absolute positioning
G1 X0 Y0 F10000 		 										; Move to the center of the bed. Adjust to the co-ordinates required for the centre of your bed

; ################# Home Z Preparation ################

M558 F250 				 										; Set the probing speed
G30					 											; Probe a single point
M558 F30 				 										; Set a slower probing speed
G30					 											; Probe a single point

The homeall.g should have something similar to the above or should call the homez.g file using

M98 P"homez.g"

Testing Macros

It is suggested that you create a number of macros to allow testing of your BLTouch. These should each be created in the macros folder.

Create a file in your macros folder called

alarm release + pin

In it, paste the following code

M280 P0 S160 ; Alarm Release and Push-Pin UP

Create a file in your macros folder called

pin up

In it, paste the following code

M280 P0 S90 ; Send PWM channel 0 the s90 (angle) command

Create a file in your macros folder called

pin down

In it, paste the following code

M280 P0 S10 ; Send PWM channel 0 the S10 (angle) command

Create a file in your macros folder called

self-test

In it, paste the following code

M280 P0 S120 ; Send PWM channel 7 the S10 (angle) command

Links to Relevant Duet3D Documentation

Connecting a BLTouch
Troubleshooting a BLTouch

Marlin Fast Probe

There is a guide to replicating Marlins Fast Probe feature here.

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