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    M31855k and PT100

    Scheduled Pinned Locked Moved Unsolved
    Tuning and tweaking
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    • c310undefined
      c310
      last edited by

      Hello! Is it possible to configure DuetWiFi with M31855k + PT100?
      RRF3.4

      direct PT100 reading is about 109 ohm (23' С seems to be correct)

      With this daughterboard i have connected 100 Ohm resistor. it reads 30'C, that is completely wrong..

      Configuration is

      IMG_20221203_163815.jpg IMG_20221203_163803.jpg ```

      M308 S1 P"spi.cs1" Y"thermocouple-max31855" 
      M950 H1 C"e0_heat" T1		
      

      So, questions

      1. is M31855k compatible with PT-100?
      2. if yes, what should i change in config to make it working ?

      Many thanks

      dc42undefined 1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators @c310
        last edited by

        @c310 the MAX31855 chip is for interfacing to thermocouples only. It cannot interface to PT100 or PT1000 sensors.

        For PT100 sensors we make a similar daughter board that uses the MAX31865 chip.

        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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