Duet Ethernet with header expansion



  • Hi guys

    i´m using a duet2 ethernet with the header expansion and my question about is, i want to use more sensoric and there i need some pins from the 50 pin connector . use the expansion all of them or can i use some of them ?

    thanks in front


  • administrators

    What type of sensors do you want to add?



  • some position and pressure sensors



  • i want to build a duel extruder who can lift the nozzle and the positioning should work with pressure sensoric ! but i want messure also the pressure from the material in the extruder .


  • administrators

    Here are 4 ways to add sensors:

    • If the sensor is a simple switch or has a single digital output, use an endstop input. There are 5 on the expansion connector.
    • If it has an analog output or is a variable resistance, use a thermistor input. The are 5 on the expansion connector. They are filtered on the Duet, so the response will be delayed by a few milliseconds.
    • Other types of sensor are probably best connected to the SPI bus, either on the expansion connector or on the daughter board connector.
    • There is also support in the firmware for connecting an I2C expansion board based on the SX1509B chip. These boards are available from Adafruit and Sparkfun.

    HTH David



  • i use the expansion breakout board !
    sorry my question have to be more precission .



  • i use 4 tb6600 driver its a very big printer and i don´t want to drive so much power over the board ! can i connect more of them directly on the 50 pin header without cilling the board ! signal in tb6600 17ma 3-5v and the pin on the bourd bring only 2ma 3,3v ?


  • administrators

    To get at the other expansion pins, you could clamp a third IDC connector on the ribbon cable and connect to that using a 2-row header pin strip.

    The expansion connector stepper driver pins won't supply 17mA, so you probably do need the breakout board for reliable operation.



  • can you tell me the used pins from the duet expansion stepper breakout boards . if not all of them used i can use the pins from the expansion header for my sensoric.



  • is it possible to use the stepper break out and th duex 5 at the same time with a y conector idc?



  • i ve not seen this idc hack you told me ! thank you for your support !


  • administrators

    @madedi123 said in Duet Ethernet with header expansion:

    can you tell me the used pins from the duet expansion stepper breakout boards . if not all of them used i can use the pins from the expansion header for my sensoric.

    The 5 sets of step, direction and CS/EN pins are used by the external stepper interface. Some of the heater outputs are routed through a buffer to the servo outputs, but that doesn't stop you using them on the expansion connector too if you are not using the servo outputs.


  • administrators

    @madedi123 said in Duet Ethernet with header expansion:

    is it possible to use the stepper break out and th duex 5 at the same time with a y conector idc?

    No, because the CS/EN lines will be treated as CS lines if a DueX5 is present. However:

    1. You can use a DueX2 + external stepper driver interface board, if you connect only 3 stepper motors to the external stepper interface board (the last 3 so that they don't clash with the two drivers on the DueX2);
    2. We're looking at releasing a DueX0 board, which will be like a DueX5 but with external stepper drivers on board instead of TMC2660 drivers.

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