termocouple connection



  • I'm using Duet2 v1.2 with rf3.0 for controling few hooper dryer. At this piont I have connected 4 termocouple and 3 thermistors. Now I need to connect extra 2 thermocouple. I want to know is there a possible way to connect another thermocouple board directly to expansion connector, without duex board?


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  • Thx. This sites i know very well:) I was hoping that there is a way to connect thermocouple board directly too some pins in extension connector.



  • @nikos
    no, you need an extra chip for thermocouple.



  • Ok, thx. In one of the topic some time ago, dc42 put information that connecting pt1000 directly too thermistor conector should worck fine. He don't garantie right readings, but electrictly should work. Do anybody have information is it realy work? Right reading are not a problem. I will compensate it. But I need minimum 6 sensors working up to 550c.



  • pt1000 dont need a dauther board and have to be connected directly.


  • administrators

    I think it should be possible to connect 2 more thermocouple daughter boards to the expansion connector, but I have not tested it. If you look at the DueX5 schematic here https://github.com/Duet3D/Duet-2-Hardware/tree/master/Duet_Expansion/Duex5v1.0 you can see how the daughter board connector on the DueX5 is connected to SPI and endstop pins on the expansion connector.



  • dc42 thanks for answer. I just check it, and it really works. Conecting thermocouple board directly to extension connector work realy well. I check it on my printer soo at this point I dont know how duet will be working with 3 thermocouple board, but one thermocouple board conected directly to extension connector works. THX once again.



  • Connecting termocouple board direct to extension connector as third works fine. At this point duet is working with 4 thermistors and 6 thermocouple.
    But I have another question.
    Is there possible way to have configured temp sensor without configured heater and tool. I need temp readings and graphs from all sensors but tool only for two of them.
    And another question.
    Is there a way to make temp graphs in DWC for longer period than few minutes? Hour, day?
    Or is a way to save those readings in txt file?

    Thx for answer.


  • Moderator

    @nikos said in termocouple connection:

    Is there possible way to have configured temp sensor without configured heater and tool. I need temp readings and graphs from all sensors but tool only for two of them.

    Yes, in RRF3 you can setup a sensor that isn't assigned to a tool and it can be added to the DWC graph display.

    Take a look at the M308 entry.
    https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M308_Set_or_report_sensor_parameters

    @nikos said in termocouple connection:

    Is there a way to make temp graphs in DWC for longer period than few minutes? Hour, day?
    Or is a way to save those readings in txt file?

    Not currently.



  • Thanks for answer.
    I check a way with M308 only, but it dosen't work. Probably I make some mistake. I will check it again.

    Last question.

    I have a printer with difrent axes sizes depends of configuration and prosses. Is there a way to configure 2 mechanical endstop on the both ends of phisical axes. On min and max. And depends of gcode home to min or max.


  • administrators

    @nikos said in termocouple connection:

    I have a printer with difrent axes sizes depends of configuration and prosses. Is there a way to configure 2 mechanical endstop on the both ends of phisical axes. On min and max. And depends of gcode home to min or max.

    You can connect two endstop switches, but moly one switch er axis can be active during homing. You can change which one using the M574 command.

    If there are large configuration changes between the two machine configurations, then it may be simplest to set up two separate configuration folders in /sys and use the M505 command to switch between them. If the changes are smaller, you may prefer to use conditional GCode within the files that need to behave differently depending on the machine configuration.


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