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    How many temperature sensors on Duet

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    Duet Hardware and wiring
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    • pabomanundefined
      paboman
      last edited by

      What is the maximum number of temperature sensor Duet can manage?
      I would like to add controlled hot chamber but I already have 2 hotends and 1 bed, no more temp inputs.
      Are there some pins to addres to read one more temp sensor ?

      thx!

      1riundefined 1 Reply Last reply Reply Quote 0
      • 1riundefined
        1ri @paboman
        last edited by

        @paboman

        This may help you

        https://duet3d.dozuki.com/Wiki/Duet_Wiring_Diagrams

        See the xpansion pinout. 35 to 39 are what you are looking for, I think

        pabomanundefined 1 Reply Last reply Reply Quote 1
        • dc42undefined
          dc42 administrators
          last edited by

          The maximum number of temperature sensors supported in firmware is 16. That's 8 thermistors or PT100 sensors, and 8 PT100 or thermocouple sensors connected using daughter boards.

          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

          1 Reply Last reply Reply Quote 0
          • pabomanundefined
            paboman @1ri
            last edited by

            so without the daugher board I can connect an NTC probe directly to pin 35 (thermistor) and pin 40 (vssa) right ?

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

              You must also connect a resistor (usually 4.7k) between the thermistor input and VREF on the expansion connector.

              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

              1 Reply Last reply Reply Quote 1
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