BLTouch working

gideon

Check your M558 and G31 commands, and see my previous response in this thread.

I still have the problem that my bltouch does not want to trigger,
after my idea, the settings are right
M307 H3 A-1 C-1 D-1; bltouch
M558 P5 X0 Y0 Z1 H5 F100 T2000; bltouch
G31 X35 Y0 Z2.6 P25; bltouch
i use firmware 1.20

if not.
I would like to hear it
what I can do about it,

dc42

If you are getting a reading of 1000 all the time, see my post https://www.duet3d.com/forum/thread.php?pid=34470#p34470.

gideon

Hey,
all wires are connected properly the firmware is 1.20
but I'm afraid my bltouch is faulty, if it is properly mounted then I do not measure anything at all on the output,
if I hang it on them, then it works occasionally and then I measure 4.6 volts without resistance. this is then not connected to the duet just to test so think that the problem is there
thanks for thinking along

mgrimes1907

Trying to get y BLTouch working on my Duet WIFI with DUEX 5. I have the Heater7 (H7) disabled and using PWM5 as the servo signal for the BLtouch. I have changed all the settings in the config.g file as per the WIKI and the forum. I can get the probe to deploy and retract but when I send the command M280 P7 S10, the Z Probe box in the web interface stays at 464. When I type in M280 P7 S60, the Z-Probe box in the web interface says 464. No change. I have the latest version of the BLTouch with the trace cut for 3.3 volt. The White wire is hooked to STP and the black wire is hooked to GND on the Z STOP connection.

I am running Version 1.20

My config.g file lines:
; Endstops
M307 H7 A-1 C-1 D-1
M558 P5 X0 Y0 Z1.5 H5 F100 T2000
M574 Z1 S0 ; Set active low endstops
M574 X1 Y1 S1 ; Set active high endstops
;M558 P1 H5 F120 T6000 ; Set Z probe type to unmodulated and the dive height + speeds
;G31 P500 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
G31 X0 Y0 Z2 P25
M557 X15:895 Y15:505 S20 ; Define mesh grid

Anyone have any idea what I am doing wrong?

I just saw what I did. Z-Probe, Not Z-Stop

mgrimes1907

Just wondering, is it a big deal if I get a reading of 965 when I send the command M280 p7 s60?

dc42

From those readings , I think you must currently be using M552 P1 instead of M558 P5.

mgrimes1907

I posted my Endstop section of my config.g two post ahead. I am using M558 P5

dc42

Please check that you don't have another M558 command later in config.g or in config-override.g. A reading other than 0 or 1000 with M558 P5 doesn't make sense, unless there are continuous pulses on the Z probe input pin.

You can run M558 with no parameters to check which mode the Z probe is in.

Nylkos

You might have the same issue that I had…

Instead of M558 P5 X0 Y0 Z1 H5 F100 T2000, try M558 P1 X0 Y0 Z1.5 H5 F100 T2000
Instead of G31 X0 Y0 Z0 P25, try G31 X0 Y0 Z0 P200
I do not know with the 1.20 version but for me (I had RepRapFirmware 1.19.2 at the time), M401 & M402 had to be replaced by M98 Pdeployprobe.g (M280 P3 S10 I1)& M98 Pretractprobe.g (M280 P3 S90 I1).

I hope that it helps

mgrimes1907

I found my issue. After looking back at the code in config.g, I somehow uncommented the second M558 line. Placed a colon in front of that and it corrected the problem.

Thanks for the help though.

Arty

I'm using original Bltouch Smart. Connected it almost like duet3d wiki says, but instead of first 5v pin I've connected it to second 3.3v pin because I set bltouch to use 3.3v logic. Works like a charm.
Besides I've tried to use it half a year ago with MKS SBASE board (3.3 logic), but it was constantly stuck in error mode. I could reset it and move pin, sometimes I could even make a bed leveling.

garyd9

@Arty:

I'm using original Bltouch Smart. Connected it almost like duet3d wiki says, but instead of first 5v pin I've connected it to second 3.3v pin because I set bltouch to use 3.3v logic. Works like a charm.

I thought that the bltouch smart still needs 5v for the power… the trace is just for the LOGIC side. So, the red wire always needs 5v (regardless of if the trace is cut or not) and cutting the trace only impacts the logic signals.

(source: https://docs.wixstatic.com/ugd/f5a1c8_6f2b1ea5daf74a3c85967f2be7848cf0.pdf))

Of course, if it's working for you, then I guess it works for you.

I'm reading up on this thread as I've just ordered a BLTouch. At least to start, I'm hoping it makes manual bed levelling a bit easier. As my printer ages, and my X axis rods slowly deform, I'm also hoping the mesh compensation thing helps out.

Take care
Gary

DjDemonD

Okay, so I've read through most a lot of this post and am not much the wiser how best to setup a bltouch smart device on duetwifi. I was given one to test, and I'm curious about it.

Is anyone here using one currently on 1.21 firmware and able to state how they have it connected and configured (happy for it to be brief and technical)?

Since it seems to be a big pain in the butt, I'd gladly offer a discount code on a piezo probe (or any of our other stuff) to anyone who can simplify this for me…

Is the info in the new wiki correct?

dc42

As in the wiki. Here's a photo of how I connected it for testing firmware 1.21RC2.

DjDemonD

Thanks David, very helpful.

Installed as per wiki instructions (and your photo - might be worth adding that to the wiki, more pictures to follow is something people have been asking for - don't know if other versions have different wiring etc.).

Remember those following this to comment out any M307 commands in config_override.g which relate to heater 3 (H3) as this was preventing the servo from operating.

I have done some systematic (and fair) testing of the BLtouch which I will report on over in reprap forum http://forums.reprap.org/read.php?1,767998,811976,page=39

T3P3Tony

@DjDemonD:

might be worth adding that to the wiki, more pictures to follow is something people have been asking for

Done!

gnatman

I finally got my extruder mounted on my Hevo. I'm trying to configure my BLTouch to work. I followed this thread and have been able to get the probe to deploy and stop once it triggers. Where I am having an issue is the offset. The nozzles are still too high. If I do an emergency stop I can then move the z up 1.5. So how do I tell the BL touch that this is where it should be. either this is "0" or have it offset.
I thought I would do it here in the code below, but thats not changing anything.
; Endstops

M574 X1 Y1 S1
M307 H3 A-1 C-1 D-1 ; use pin 3 on header for bltouch
M558 P5 X0 Y0 Z1 H5 F500 T2000 ; probe type and use probe for homing z
G31 X26.7 Y22.2 Z1.5 P25 ; Defines offset of sensor in relation to nozzle

dc42

The Z parameter in the G31 command tells the firmware how high the nozzle is when the Z probe triggers. See https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height.

gnatman

@dc42:

The Z parameter in the G31 command tells the firmware how high the nozzle is when the Z probe triggers. See https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height.

step 8 says to repeat the above steps. When I do that, my height changes each time

7:08:53 AMG30 S-1
Stopped at height 1.834 mm
7:08:31 AMG30 S-1
Stopped at height 2.855 mm
7:08:05 AMG30 S-1
Stopped at height 2.812 mm
7:07:08 AMG30 S-1
Stopped at height 2.588 mm

nickpgre

I had to lower my probing speeds and also introduced a recovery time. Still the probing heights changes range between -0.03 to 0.03 but my prints especially the first layer never caused me any issues.

From M558 P5 X0 Y0 Z1 H5 F500 T2000
I have M558 P9 X0 Y0 Z1 H5 F160 R0.250 T2000 ; P9 probe