BLTouch through an Expansion 3HC !?

nachogil

Hi,

I`m trying to move some connections from a Duet 6HC to an Expansion 3HC.

Motors, temp, and limits sensors are working fine, but I`m not able to do work a BLTouch

I checked all the physical connections and wires and don't looks like a hardware problem.

This is my original code with the 6HC that works fine:

M950 S0 C"io7.out"             			; create servo pin 0 for BLTouch (use IO_4/5/7 for 6HC, IO_1/2/3 for Mini 5+)
M558 P9 C"io7.in" H5 F120 T6000 		; set Z probe type to bltouch and the dive height + speeds
G31 X52 Y-36 Z0.5         			; set Z probe trigger value, offset and trigger height 
M557 X80:650 Y80:2000 S250:300 			; define mesh grid; probe from X=10 to 620, Y=10 to 2010mm with a mesh spacing of 100mm

This is the code I`m using with the 3HC:

M950 S0 C"1.io5.out"             		; create servo pin 0 for BLTouch (use IO_4/5/7 for 6HC, IO_1/2/3 for Mini 5+)
M558 P9 C"1.io5.in" H5 F120 T6000 		; set Z probe type to bltouch and the dive height + speeds
G31 X52 Y-36 Z0.5         			; set Z probe trigger value, offset and trigger height ; 1.5 aprox real 0.0 			; define mesh grid; probe from X=10 to 620, Y=10 to 2010mm with a mesh spacing of 100mm

In both cases, I have these deploy and retract codes:

; deployprobe.g
; called to deploy a physical Z probe
M280 P0 S10 ; deploy BLTouch

; retractprobe.g
; called to retract a physical Z probe
M280 P0 S90 ; retract BLTouc

What I`m doing wrong?

droftarts

@nachogil I think the problem is this (https://docs.duet3d.com/User_manual/Connecting_hardware/Z_probe_connecting#wiring-the-bltouch) :

Connect the BLTouch to a PWM-capable IO header.

On 3HC, only io1 and io4 are PWM capable. See https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Expansion_3HC#inputoutput

If that doesn't help, what firmware version are you running? Support for BLTouch on expansion boards was added with RRF 3.1.0, so I imagine your are using a version that supports it.
Send M98 P"config.g" to check if your config.g is generating any errors.

Ian

nachogil

@droftarts I'm using 3.4.4 firmware.

I'm going to investigate and test based on your help.

Thanks a lot

nachogil

I have changed from io5 to io4 and works fine

Thanks a lot!!