SOLVED PT100 Duet 2 daughter board issues



  • Sorry guys, another PT100 topic post
    I have been through the search engine and havent been able to discover my issue.
    I'm getting 2000 degrees on Tool 4 where the PT100 is. Its a new daughter board and new PT100 dyze hotend. Im running RRF 3.2 on a E3d Toolchanger.

    I've tried the resister still 2000
    I've tried powering via USB still 2000
    I've tried the right and left connector on the board no change

    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 C0 ; Set thermistor
    M950 H0 C"bedheat" T0 ; Bed heater
    M140 H0
    M143 H0 S225 ; Set temperature limit for heater 0 to 225C
    M308 S1 P"e0temp" Y"thermistor" A"T0" T100000 B4725 C7.06e-8 ; Set thermistor
    M950 H1 C"e0heat" T1 ; Extruder 0 heater
    M143 H1 S300 ; Set temperature limit for heater 1 to 300C
    M308 S2 P"e1temp" Y"thermistor" A"T1" T100000 B4725 C7.06e-8 ; Set thermistor
    M950 H2 C"e1heat" T2 ; Extruder 0 heater
    M143 H2 S300 ; Set temperature limit for heater 2 to 300C
    M308 S3 P"e2temp" Y"thermistor" A"T2" T100000 B4725 C7.06e-8 ; Set thermistor
    M950 H3 C"duex.e2heat" T3 ; Extruder 0 heater
    M143 H3 S300 ; Set temperature limit for heater 3 to 300C
    M308 S4 P"spi.cs1" Y"rtd-max31865" A"T3" ; create sensor number 1 as a PT100 sensor in the first position on the Duet 2 daughter board connector
    M950 H4 C"duex.e3heat" T4 ; Extruder 0 heater
    M307 H1 B0 S0.50
    M143 H4 S480 ; Set temperature limit for heater 4 to 480C
    2000.jpg 20210215_212558.jpg



  • Have you checked the PT100 with an ohmmeter? At 20C it should be 108.9 ohms. Is it possible it's a PT1000 instead?


  • administrators

    1. Run M308 S4 and see what the response is, in particular the "Last error".
    2. If you connect the 100 ohm resistor to that channel in place of the PT100, do you get a reading close to 0C ?

  • administrators

    Looks like you have the jumpers in the wrong place. When using a 2-wire connection, you need to fit 2 jumpers to each channel, between pins 1-2 and between pins 3-4. In your photo, I think I see jumpers between pins 2-3.



  • fasdfass.jpg

    No on the resistor i get 2000 degrees



  • @dc42 Thank you so much for rescuing me from my own stupidity 🙂
    now working


  • administrators

    We're here to help!


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