Duet Mini 5 BTT MAX31865 Issue

jay_s_uk

@wayneosdias can you be a bit more explicit about what pins you've connected together?

wayneosdias

@jay_s_uk Sure, referencing the MAX31865 pcb numbered a classic dip and the Duet 'TEMP DAUGHTER' header as a header the connections are;
MAX / Duet
1 NC / -
2 SDI / 5 MOSI
3 CLK / 4 SCK
4 CS / 1 CS2 or 3CS1
5 SDO / 6 MISO
6 NC / -
7 NC / -
8 NC / -
9 GND / 2 GND
10 V_IN / 8 +3.3V
11 FORCE- common to 12 RTDIN- / -
13 RTDIN+ common to 14 FORCE+ / -
15 GND / -
16 NC / -

jay_s_uk

@wayneosdias how do you have the dip switches set?
where are you connecting the PT100 to?
FYI, you'll also have to add R430 to the M308 line as it uses a different sense resistor than the one expected by the firmware by default

wayneosdias

@jay_s_uk
The default switches as I recd it was
Off, Off, Off, On
which was odd as the sensor they supply with the board is a two-wire sensor.
I changed it
On, On, On, Off
Doing so shorts RT+ to Force+ and RT- to Force-

The sensor is wired directly to RT+ to one leg of the sensor and RT- to the other leg.

Re the M308 R430, Thanks for the tip

dc42

@wayneosdias how long are the wires between the Duet daughterboard connector and the MAX31865 board?

wayneosdias

@dc42 For bench testing just using breadboard jumpers, ~5"

wayneosdias

@wayneosdias I also just checked that GND Pins 9 and 15 of the MAX pcb are common to each other. Im only using one for GND to the Mini.

dc42

@wayneosdias I can't see anything wrong with your description of how you have wired it; and 5" of wire should not be a problem.

What message if any do you get when you send the M308 command?

wayneosdias

@dc42

So thats interesting, does this point to a config problem? havnt changed anything in the config which still is; (sans network settings)

; Configuration file for Duet 3 Mini 5+ 
; executed by the firmware on start-up
; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"Ender 3 Pro"                          ; set printer name
;M918 P1 E4 F2000000                          ; configure direct-connect display
;M918 P2 E4 F2000000 ; configure direct-connect display
;M150 X2 R255 U255 B255 S3 ; set all 3 LEDs to white
M575 P1 S2 B57600
; Network


; Drives
M569 P0 S1 D3 V40							;X0
M569 P1 S1 D3 V40                           ;Y0
M569 P2 S0 D3 V40                           ;Z0
M569 P3 S0 D3 V40                           ;Z1
M569 P4 S1 D3 V40                           ;E0
M584 X0 Y1 Z2:3 E4                     		;set drive mapping


M350 X16 Y16 Z16 E16 I1                      ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E424.90             ; set steps per mm
M566 X1200.00 Y1200.00 Z400.00 E300.00        ; set maximum instantaneous speed changes (mm/min)
M203 X9000.00 Y9000.00 Z200.00 E6000.00      ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z100.00 E5000.00        ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E1000 I50                ; 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 X235 Y235 Z215 S0                       ; set axis maxima

; Endstops
M574 X1 S1 P"io6.in"                         ; configure switch-type (e.g. microswitch) endstop for low end on X via pin io5.in
M574 Y1 S1 P"io5.in"                         ; configure switch-type (e.g. microswitch) endstop for low end on Y via pin io6.in
;M574 Z1 S1 P"io2.in"                         ; configure switch-type (e.g. microswitch) endstop for low end on Z via pin io2.in

; Z-Probe
M950 S0 C"io3.out"                           ; create servo pin 0 for BLTouch
M558 P9 C"io3.in" H5 F120 T6000              ; set Z probe type to bltouch and the dive height + speeds
G31 P1000 X-32 Y-41 Z1                      ; set Z probe trigger value, offset and trigger height
M557 X30:190 Y30:190 S20                       ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4092 A"Bed"; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out6" T0                           ; create bed heater output on out0 and map it to sensor 0
;M307 H0 B1 S1.00                             ; enable bang-bang mode for the bed heater and set PWM limit
;M307 H0 R1.012 K0.345:0.000 D4.32 E1.35 S1.00 B0
M307 H0 R1.071 K0.348:0.000 D3.57 E1.35 S1.00 B0
M140 H0                                      ; map heated bed to heater 0
M143 H0 S150     ; set temperature limit for heater 0 to 150C
;Old for thermister
;M308 S1 P"temp1" Y"thermistor" T10000 B4092 ; configure sensor 1 as thermistor on pin temp1
;M950 H1 C"out1" T1                           ; create nozzle heater output on out1 and map it to sensor 1
;New for PT100
M308 S1 P"spi.cs1" Y"rtd-max31865"
M950 H1 C"out1" T1 ; create heater 1 and map sensor 1

;M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit
;M307 H1 R3.416 K0.428:0.000 D10.54 E1.35 S1.00 B0 V23.9
;M307 H1 R3.288 K0.436:0.000 D11.30 E1.35 S1.00 B0 V23.9
;M307 H1 R3.209 K0.313:0.000 D11.51 E1.35 S1.00 B0 V23.9
M307 H1 R2.907 K0.303:0.000 D12.84 E1.35 S1.00 B0 V23.9
M143 H1 S275                                 ; set temperature limit for heater 1 to 275C

; Fans
M950 F0 C"out3" Q1000                         ; create fan 0 on pin out3 and set its frequency
M106 P0 C"PartCool" S0 H-1                   ; set fan 0 name and value. Thermostatic control is turned off
;M950 F1 C"out4" Q1000                         ; create fan 1 on pin out4 and set its frequency
;M106 P1 C"HotEnd" S1 H1 T45                  ; set fan 1 name and value. Thermostatic control is turned on
M950 F2 C"out5" Q500                         ; create fan 2 on pin out5 and set its frequency
M106 P2 C"CaseFan" S1 H1:0 T30                ; set fan 2 name and value. Thermostatic control is turned on M106 P2 C"CaseFan" S1 H1:0 T45 
M950 F3 C"out6" Q500                         ; create fan 3 on pin out6 and set its frequency
M106 P3 C"LEDs" S1 H-1                       ; set fan 3 name and value. Thermostatic control is turned off

; Tools
M563 P0 D0 H1 F0
G10 P0 X0 Y0 Z0                              ; set tool 0 axis offsets
G10 P0 R0 S0                                 ; set initial tool 0 active and standby temperatures to 0C
T0         ; select first tool


; Miscellaneous

gloomyandy

@wayneosdias Try running the M308 command for S1 in the console and see if you get any sort of error reported.

wayneosdias

@gloomyandy
Same as above

wayneosdias

Is there a simple way to test spi on a Duet board? Before pulling out my scope I just put a cheap logic analyzer on CS1 CS2 CLK MOSI and MISO ref'd to ground and no activity. The CS1 CS2 MOSI are logic high as you would expect, and I see no activity either triggered or free running.

Is there anyway to force spi comms to verify HW working?

dc42

@wayneosdias I meant for you to sent the command:

M308 S1 P"spi.cs1" Y"rtd-max31865"

or using spi.cs2 if that is how it is connected at present.

wayneosdias

@dc42
Ok got comms sorted. I got this initially

Looks like the MISO line isnt pulled up locally on the the BTT board. I guess this makes sense as the board is meant to plug into 'step stick port' on a BTT driver board. In all the literature I read from BTT/Biqu makes no mention of pullups or active line jumpering. Any way pulled the MISO line up to 3V via 10k and now I get the following;

DWC is also reporting semi resonable values so now just some tuning and firmer wiring to get the ball rolling. I have a Duet PT100 dtr board coming from filastruda and I dont think ill have it for a week. I also ordered an Adafruit MAX31865 bob that should be here tomorrow so Ill follow up this thread on how that gos.

Huge thanks for this Forum and support, the best