BLTouch working

Motalw · 20 Sept 2017, 21:36

Just did a G29 and got this with the IR Probe

avaradus · 31 Oct 2017, 20:48

Hello ALL !

I'm using DUET 0.6 and TLTouch sensor from aliexpress. It's clone of BLTouch.
While sensor is triggered with 240 ohm resistor, output value is 1.3 v. it's low level and not worked!
After i install 560 ohm resistor then output voltage becomes 2 v and it is a hi level and now work fine.
I wrote this information may be it's help anybody who use TLTouch sensor.

Thank's for all, and bye!

huntajav · 5 Nov 2017, 23:33

@dc42:

The IR probe results have one corner point much lower than the rest. There must be something in that corner to cause that, or perhaps you are probing too close to the edge.

hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.

dc42 · 6 Nov 2017, 11:17

@huntajav:

hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.

How is it behaving then?

huntajav · 6 Nov 2017, 14:47

@dc42:

@huntajav:

hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.

How is it behaving then?

It stays stationary unless there is a layer change. What I noticed on the other video is that the z-axis steppers would move back and forth based on compensation needs. Does this mean my bed is just perfectly leveled (highly unlikely)?

Syko_Symatic · 13 Nov 2017, 13:56

I fear I may have messed up! I think I have had my BLTouch connected with a 10ohm resistor instead! Could I have damaged something? I have recently rebuilt the printer and when testing the BLTouch will not self test or fire. It does reset but nothing else? I am picking up some new (240ohm metal film) resistors tonight to replace the current (wrong) one.

Have I screwed my board?

dc42 · 13 Nov 2017, 14:54

It's unlikely that you have damaged the Duet.

Syko_Symatic · 13 Nov 2017, 15:33

@dc42:

It's unlikely that you have damaged the Duet.

It should also be unlikely that I have damaged the BLTouch. So I am guessing that hopefully replacing the resistor will work. Odd as it worked for a year with that 10ohm resistor! Unless I need to adjust the pin? Hmm.. replace the resistor first, and fiddle with the pin after.

Syko_Symatic · 13 Nov 2017, 19:20

New resistor and now have 2.9v but still have the same issue. The BLtouch does not retract the pin. Also does not run the self test at start up. Hmm??

So, triple checked all wiring. That is all fine.

Probe fires using g-code but won’t retract.

Does not run startup routine.

Will not run self test.

3.3v measures 3.21v

5v measures 4.86v

Vin reading is 24v

Any idea?

Syko_Symatic · 14 Nov 2017, 13:39

Ok here we go! Problem solved! Turns out it was the proximity of the sensor to the stepper motor. Must be the magnets messing with each other! Move it away works perfectly set it to test mode and put it by the motor and poof, nothing works! Going to have to figure out an alternative mounting position!

totalitarian · 12 Dec 2017, 21:30

Woohoo, i'm 99% of the way there. My issue is that during G29 mesh levelling, it ..

deploys probe,
lowers bed,
triggers,
raises the nozzle and simultaneously deploys the probe again.

I was expecting it to only drop the probe after it has finished raising.

Also, what controls the XY speed during homing?

dc42 · 12 Dec 2017, 21:49

The M558 F parameter controls the speed of probing, and the T parameter controls the speed of travel moves between probe points.

totalitarian · 12 Dec 2017, 22:04

Thanks, what is causing the probe to drop before the head has moved completely out the way?

Also my bed is 300 x 300. I want to probe 4x4 points. Does this look correct?

M557 X20:280 Y20:280 S65

gnatman · 3 Jan 2018, 14:50

I just got my BL Touch installed on my duet wifi, followed the instructions on here and another topic. I just have a question as my probe reads 1000 all the time and not 0 ever. I can successfully deploy and retract pin, and the pin retracts when I lightly touch it.

Is there anything else you need?

here is my config section for bltouch, I've not yet set the offsets as I've not yet mounted an extruder as I'm still building my hevo.
M307 H3 A-1 C-1 D-1 ; This is for BLTouch
M558 P5 X0 Y0 Z1 H5 F100 T2000
G31 X0 Y0 Z0 P25 ; Change the x and y for the offset of the sensor in relation to the nozzle and set z offset as normal too.

Thanks and look forward to your help
Curtis

dc42 · 3 Jan 2018, 15:14

Two likely possibilities:

1. You are using a Duet 0.8.5 and not running the latest firmware, so Z probe mode 5 doesn't work. Upgrade your firmware to 1.20.

2. The output wire of the BLtouch (which is the white one AFAIR) isn't connected to the pin labelled IN on the Z-probe connector of the Duet.

gnatman · 4 Jan 2018, 00:33

@dc42:

Two likely possibilities:

1. You are using a Duet 0.8.5 and not running the latest firmware, so Z probe mode 5 doesn't work. Upgrade your firmware to 1.20.

2. The output wire of the BLtouch (which is the white one AFAIR) isn't connected to the pin labelled IN on the Z-probe connector of the Duet.

Thanks, I totally had it in the zstop pins.. whoops.

Thanks again

gideon · 1 Apr 2018, 20:43

Hey,
I just got my BL Touch installed on my duet wifi, followed the instructions on here and another topic. I just have my test reads 1000 all the time and not 0 ever. I can easily deploy and retract when I lightly touch it.
and when I do homez.g he does almost everything when the bltouch comes against the bed then he does not stop the z then just goes up
; called to home the Z axis
;
T0; select tool
G91; relative coordinates
M280 P3 S160 I1; release Z probe alarm
G1 Z5 F2000, lower bed
G4 P500, wait for the bed to lower
G90: absolute positioning
G1 X200 Y200 F3000, move to center
M401, deploy the probe
G30, calibrate Z-axis
M402; Retract Probe

Is there anything else you need?

greetings gideon

dc42 · 4 Jan 2018, 21:31

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

gideon · 4 Jan 2018, 21:43

hellodc42
I have this in me config.g
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

gideon · 1 May 2018, 10:44

@dc42:

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,