BLTouch not responding to code

peterartechno

Re: using BLtouch when using Duet Breakout Expansion Board

As can be read in the topic above, I want to use a BLTouch for my printer.
I use a Duet wifi + Breakout expansion board.
Of all the expansion boards and manuals, this particular board has no manual on the wiki unfortunately.

M115: FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.1.1 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-05-19b2
DWC 2.0.7

What I did:
I used this website (https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe) to set my BLTouch.

Since I do not have a Duex I used this setup. Because I use the Expansion Breakout board (EBOB), the pins in this table are not available.

I used the H7_PWM on the EBOB where:
Heater3 becomes exp.heater7
+5V is +5V (on H7_PWM)
GND is GND (on H7_PWM)

Z probe in and GND are for the white and black cable.

Don't mind the colors of the cables, they are correct. I double checked all the cables

When I start the printer, the BLTouch does deploy and retract two times. From that, I conclude that the cables are correct.

My problem is with the software implementation. I followed all the instructions on every page I could find, tried the troubleshooter but it does not react to my commands.

My config.g file:

; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"Artechno Printer"                       ; set printer name

; Network
M551 P"Artechno"                               ; set password
M552 S1                                        ; enable network
M586 P0 S1                                     ; enable HTTP
M586 P1 S0                                     ; disable FTP
M586 P2 S0                                     ; disable Telnet

; Drives
M569 P5 R1 S1 T5.0:5.0:5:5                                 ; physical drive 0 goes forwards
M569 P6 R1 S0 T5.0:5.0:5:5                                 ; physical drive 1 goes forwards
M569 P7 R1 S0 T5.0:5.0:5:5                                 ; physical drive 2 goes forwards
M569 P8 R1 S1 T5.0:5.0:5:5                                 ; physical drive 3 goes forwards
M584 X5 Y6 Z7 E3                               ; set drive mapping
M350 E16 I0                                    ; configure microstepping without interpolation
M92 X80.00 Y80.00 Z320.00 E410                 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00            ; set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z180.00 E1200.00        ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z20.00 E200.00            ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                   ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                               ; set axis minima
M208 X1200 Y900 Z400 S0                       ; set axis maxima

; Endstops
M574 X1 S1 P"!xstop"                            ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"!ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2                                     ; configure Z-probe endstop for low end on Z
M950 S0 C"exp.heater7"
M558 P9 C"^zprobe.in" H5 F100 T2000				; BLTouch probe type
G31 X-26 Y24 Z5.0 P25							; Probe offsets
M557 X15:215 Y15:195 S50                        ; define mesh grid
M307 H7 A-1 C-1 D-1
M581 T1 S1 P"e1stop"							; When motor stalls, pause print

; Z-Probe





; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 A199.0 C962.6 D60 B0                   ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                              ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                               ; define tool 0
G10 P0 X0 Y0 Z0                                ; set tool 0 axis offsets
G10 P0 R0 S0                                   ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

I also have a deployprobe.g:
M280 P0 S10
and a retractprobe.g:
M280 P0 S90
I tried with and without the I1, no difference.

I tried different values for P as long as they corresponded with the P/S from my M950 command (as it suggests on the manual pages), no difference.

My M401 and M402 don't do anything.
I read that the M307 H7 A-1 C-1 D-1 does not do anything but I tried it with and without, no difference.
I also read that you should check your config-override.g but apparantly I do not have one.

I think something is wrong in my code but I can't figure out why. I followed the instructions of @Phaedrux in the previous topic but somewhere I must have missed something.

I hope that somebody can help me.

Thanks in advance.

Veti

@peterartechno said in BLTouch not responding to code:

M950 S0 C"exp.heater7"

the expansion board you are using inverts the signal

so change to
M950 S0 C"!exp.heater7"

peterartechno

Thank you! That did the trick
(such a simple answer can be so frustrating haha)

droftarts

@peterartechno I’ll add a note to the page here tomorrow: https://duet3d.dozuki.com/Wiki/Duet_Expansion_Breakout_Board
There’s a lack of information about how to use heater 6 and 7 as (small) servo outputs.

Ian

peterartechno

@droftarts That would be a big help for anybody who has the EBOB!