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BLTouch working

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Duet Hardware and wiring
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  • undefined
    InSanity
    last edited by 5 Jan 2017, 15:27

    Everything is working perfectly now.

    I can confirm the BLTouch works perfect with the Z-Probe input as well as E0 or E1. In either case be sure to use the 240 (or 220) ohm resistor from signal to gnd.

    I can also confirm you must have a low value for G31 P parameter. I'm now using P1 and it works perfect, P25 is a safe value it would appear.

    On a side note and certainly not for everyone I'm using a 47k resistor a 100k resistor and a green LED on the Z-Probe input to act as a zener diode limiting the voltage to around 2.7v even if I go as high as 24v on the Z-Probe. I have two harnesses that I can quickly swap out for all this testing. The 100k resistor acts to pull the signal back down. The 47k is a current limit and the LED is between gnd and signal. I've tested this on a 300 Mhz scope and even trying to cause spikes with 24v I never had anything go above 2.7v. Plus it lights up when triggered 🙂

    Jeff

    Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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    • undefined
      dc42 administrators
      last edited by 5 Jan 2017, 16:55

      Perhaps one of you who has a BLTouch working would like to add a section on how you did it to the wiki page on connecting a Z probe?

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

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      • undefined
        InSanity
        last edited by 5 Jan 2017, 17:10

        @dc42:

        Perhaps one of you who has a BLTouch working would like to add a section on how you did it to the wiki page on connecting a Z probe?

        I was thinking the same thing. Be happy to work on that, perhaps combining knowledge first and then compiling it together.

        Jeff

        Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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        • undefined
          Sniffle
          last edited by 5 Jan 2017, 17:26

          I'll be happy to help with anything but for the most part i pulled everything from W3's work.

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          • undefined
            Sniffle
            last edited by 1 May 2017, 17:47 5 Jan 2017, 17:41

            This is pretty much what I did. Bur I also made macro's for the deploy, retract, reset and self test functions of the probe.

            @W3DRK:

            • BLTouch 5V leads are connected to expansion header pins 1-2, and the servo lead is connected to pin 21 (PWM for heater 3)

            • BLTouch endstop leads are paralleled with a 240ohm resistor as documented by Antclabs to make it safe for 3.3v logic and connected to E0 endstop header

            • [c]M307 H3 A-1 C-1 D-1[/c] is added to config.g to reserve pin 21 for M42 or servo use

            • M558 is set to probe type 4 and G31 is set for a very low trigger value since the BLTouch only triggers the endstop for 5ms(Sniffle used 25)

            • Deployprobe.g macro contains the line [c]M280 P3 S10 I1[/c] to deploy the BLTouch probe

            • Retractprobe.g macro contains the line [c]M280 P3 S90 I1[/c] to retract the BLTouch probe

            • Deploy and Retract macros are added to bed.g and homing macros

            And I think that's about it…

            Also as far as commissioning the probe, and notes of interest from experience

            the probe should be deployed and manually triggered until a value is seen in the web interface(the web interface doesnt update fast enough to always show a triggered state so it may take a few/several triggers until you see the value in the web interface to know that it works)

            you should know or confirm your offsets for X and Y in G31 move the probe to the first probe position and deploy the probe, if it is off the bed and the bed is too high it WILL destroy the probe(ask me how i know…) when probing, and adjustments must be made.

            to finally verify that the probe is working properly using the machine itself use the following macro(replace xxx on X and Y to a safe value to be on the bed on your printer)

            G28 X Y ;home x&y
            G91 ;relative mode
            G1 Z10 ;move Z up 10 mm to ensure clearance
            G90 ;absolute mode
            G1 Xxxx Yxxx ;move to a safe probing point on the bed modify xxx to your liking
            M98 Pdeployprobe.g ;deploy the probe
            G30 S-1 ;probe Z until the probe triggers
            M98 Pretractprobe.g ;retract the probe after triggering and stop.
            
            

            Other Useful Macros


            Deploy Probe


            M280 P3 S10 I1
            

            Restract Probe


            M280 P3 S90 I1
            

            Self Test Probe


            M280 P3 S120 I1
            

            Reset Probe Error State


            M280 P3 S160 I1
            

            G29 - Mesh Leveling


            G28
            G91
            G1 Z4 F200
            G90
            M98 Pdeployprobe.g
            G29 S2
            G29
            M98 Pretractprobe.g
            G1 X10 Y10 F5000 
            
            
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            • undefined
              InSanity
              last edited by 5 Jan 2017, 19:44

              After having to solder in a new SAM4E 144 pin processor I now have a 27k resistor coming from HEATER3. My probe wiring harness has 24v and 5v supplied so I can use an inductive probe at any time…if I desire. The BLTouch fits in the hole for the inductive probe with an adapter. Well one slip with a meter probe and poof she went. In any event I'm not sure if this safety catch matters for most people but I have to say I sleep a bit better knowing I'm not going to smoke the second processor as easy. Lucky for me I have years of SMD soldering experience...but still..who needs fried components. Also fuses on power feeds is not such a bad idea either. The 5V rail if somehow sent back down that HEATER3, etc. line could easily damage the processor.

              Jeff

              Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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              • undefined
                InSanity
                last edited by 5 Jan 2017, 19:47

                M98 Pdeployprobe.g can be M401
                M98 Pretractprobe.g can be M402

                What does G29 S2 do ? I just use G29.

                This is what I run on bed.g

                G1 Z20 F6000 ; Making sure we're not going to hit the side of glass
                M400 ;Wait for move to finish
                M401 ;Deploy probe
                G29 ;probe grid
                M402 ;Retract probe

                Thanks,

                Jeff

                Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                • undefined
                  Sniffle
                  last edited by 5 Jan 2017, 20:12

                  G29 S2 clears the current heightmap in case you are trying to probe with the heightmap already loaded. also your start Gcode needs to have G29 S1 to load the heightmap or it wont compensate at all.

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                  • undefined
                    InSanity
                    last edited by 5 Jan 2017, 20:17

                    @Sniffle:

                    G29 S2 clears the current heightmap in case you are trying to probe with the heightmap already loaded. also your start Gcode needs to have G29 S1 to load the heightmap or it wont compensate at all.

                    Wow, ok this is news. I've been under the impression G29 does a new probe, creates a new map and uses it. Looking at the code seams to support that theory. Perhaps we can have some kind words from the coder ? In the mean time I'll change my bed.g to use the extra commands.

                    Thanks,

                    Jeff

                    Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                    • undefined
                      InSanity
                      last edited by 5 Jan 2017, 20:43

                      I ended up with the BLTouch because the gantry on my HackenForge Creator Pro bows in the middle from a past life of having dual extruders on it. Using an 8mm sense inductive sensor worked well with the grid mode through glass to the aluminum bed, it however weighed more then I wanted. I've done soo much to reduce weight and get a solid 120mm/s print speed and far more accuracy that I wasn't willing to keep the weight on. The BLTouch and the IR sensor are good options. I liked the IR…it just wasn't the right fit for me as I swap from Blue to Black to Glass to Glue to Spray..etc..etc. The BLTouch just works..and works well.

                      Ohh if anyone cares you can run a short NEMA 17 motor on the X Axis of the Creator Pro to cut down on weight. Granted it runs pretty warm at 1 amp...but who cares. It cuts off the ounces. I'll have to post some pics of the Hackenforge.

                      Ok I hijacked it back 🙂

                      Jeff

                      Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                      • undefined
                        ElmoC
                        last edited by 12 Jan 2017, 22:29

                        I am working on adding a BLTouch to my printer. I have the Duet 0.8.5 and see where you can set the probe type to use either the E0, E1, or the Probe header. Since I will be using +5 and a PWM from the expansion header, I was hoping I could map the BL Touch to one of the end stops on there so I can get all the connections from the expansion header. This would allow me to create a board I could plug in that the BL Touch could connect to.

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                        • undefined
                          Syko_Symatic
                          last edited by 13 Jan 2017, 12:38

                          Do I have to have a Duet 2/5 in order for the BLTouch to work?

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                          • undefined
                            InSanity
                            last edited by 13 Jan 2017, 13:49

                            @Syko_Symatic:

                            Do I have to have a Duet 2/5 in order for the BLTouch to work?

                            For the Duet WiFi the BLTouch works without any expansion board and with the Z-Probe pin already on the board. The 5 volts can come from the expansion header and control signal comes from the Heater 3 pin on the 50 pin expansion connector. The z-probe can be feed via the BLTouch with a 240 (or 220) ohm resistor in parallel with the output from the BLTouch, this drops the voltage down from the 5 volts from the BLTouch to something a bit more friendly for the 3.3v logic levels the processor expects. We'll have to get a wiring diagram together for the various models of Duet boards. It's a pretty easy install and it works great.

                            Jeff

                            Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                            • undefined
                              Syko_Symatic
                              last edited by 13 Jan 2017, 16:46

                              Thanks. That's good then! Yes a diagram would help but I understand it's early days. I have it setup currently on my Bigbox (Rumba) so looking forward to switching.

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                              • undefined
                                Syko_Symatic
                                last edited by 15 Jan 2017, 08:46

                                If anyone could knock up a quick diagram of connecting the BLTOUCH to a duet wifi I would appreciate it. I am getting everything ready to change over on Saturday evening.

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                                • undefined
                                  ThePigSlayer
                                  last edited by 16 Jan 2017, 02:30

                                  I have set my BL Touch up, but I am having a lot of repeatability issues that I am hoping someone could help me with. I have followed all the instructions in this thread as best as I could. I am using the resistor, plugging into the z probe pins, pin 1 and 2 on the expansion, and heater3 pin. I have tried changing the trigger value a bit which didnt do anything. All my connections seem fine as they are crimped and the resistor is soldered.

                                  Here are the results (just the Z coordinate) from four 5-point auto bed compensations that I did in a row, without the heated bed or anything turned on.

                                  [ 0.000] [-0.190] [0.425] [0.112] [0.158]
                                  [ 0.082] [-0.170] [0.540] [0.503] [0.285]
                                  [ 0.010] [-0.522] [0.780] [0.635] [0.293]
                                  [-0.122] [-0.637] [0.322] [0.115] [0.197]

                                  As you can see there is a big difference between each new probe sequence. Here are some relevant config files and my bed file.

                                  ; BL Touch
                                  M558 P5 X0 Y0 Z1 H4 F450 T4000
                                  G31 P25 X36 Y0 Z1.5

                                  ; Auto Bed Compensation
                                  M561
                                  M98 Pdeployprobe.g
                                  ; Probe the bed at 5 points
                                  G30 P0 X15 Y15 H0 Z-99999
                                  G30 P1 X15 Y175 H0 Z-99999
                                  G30 P2 X185 Y175 H0 Z-99999
                                  G30 P3 X185 Y15 H0 Z-99999
                                  G30 P4 X100 Y100 H0 Z-99999 S
                                  M98 Pretractprobe.g

                                  Thanks in advance for any help.

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                                  • undefined
                                    InSanity
                                    last edited by 16 Jan 2017, 02:43

                                    Few things to check,

                                    Make sure your config_override.g isn't changing the value of the G31 P25…command.

                                    I'm actually running G31 P1 (vs P25) and have been. My theory is that the even shorter pulse detection gives the Z axis less time to move once triggered. I've had really consistent results. Granted if the z axis overshoots the same each time it shouldn't matter. But still perhaps worth a try.

                                    Edit: Not that it matters but M401 can be used to call the deploy.g and M402 to call the retract. Just a bit cleaner.

                                    Jeff

                                    Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                                    • undefined
                                      InSanity
                                      last edited by 16 Jan 2017, 02:46

                                      So your not wanting to run the grid based compensation , G29 ?

                                      Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                                      • undefined
                                        ThePigSlayer
                                        last edited by 16 Jan 2017, 03:09

                                        I remember I used to have a config override file but after updating a few times it seems to have disappeared. Is this a problem?

                                        I tried a lower trigger value but haven't had any better results. I also decreased my Z acceleration as it was set pretty high. Also ironically shortly after I posted, I set up a macro for grid compensation. The probe points produce different values each time.

                                        Any other suggestions? Thanks a lot for the help. I read your previous post about M401/2, but just forgot to change it, thanks though!

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                                        • undefined
                                          InSanity
                                          last edited by 16 Jan 2017, 03:57

                                          @ThePigSlayer:

                                          I remember I used to have a config override file but after updating a few times it seems to have disappeared. Is this a problem?

                                          I tried a lower trigger value but haven't had any better results. I also decreased my Z acceleration as it was set pretty high. Also ironically shortly after I posted, I set up a macro for grid compensation. The probe points produce different values each time.

                                          Any other suggestions? Thanks a lot for the help. I read your previous post about M401/2, but just forgot to change it, thanks though!

                                          Hmm, mechanically sound printer ? In other words do you feel it's nice and solid and should be producing the same results each time ? For the grid what's the map look like, is it random junk ? Did you try changing the height of the BLTouch based on the docs that came with it ? 8m gap from bottom of BLtouch shell to bed.

                                          Jeff

                                          Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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