Z probe connector



  • It would be nice if every board had a dedicated Z probe connector with:

    • signal in
    • signal out (PWM capable)
    • ground
    • +3.3 V
    • +5.0 V
    • +12 V (perhaps)
    • +VFUSED assuming all new boards have a fuse on +VIN

    I'm in the process of testing some inductive sensors on the Mini 5 and I have no place to pick up +VFUSED other than making up a 3 pin connector that replaces either the OUT 3-4 jumper or the OUT 5-6 jumper the gives me a connection for +VFUSED and does the desired jumper selection as well.

    Yes it works but it is not as elegant as a dedicated connector would be.

    Thanks.

    Frederick


  • administrators

    Will inductive/capacitive sensors that need these high voltages not just die please (just kidding!)

    We thought we had nailed with with the IO ports right now that work for a BL touch and then you go asking for VFUSED on the same port..

    More seriously I can see the appeal for the specific case of a high voltage indictive probe - the down side is it makes it much easier for people to (mis)wire up something that feeds the 24V into the 3.3V, 5V etc



  • @T3P3Tony said in Z probe connector:

    Will inductive/capacitive sensors that need these high voltages not just die please (just kidding!)

    We thought we had nailed with with the IO ports right now that work for a BL touch and then you go asking for VFUSED on the same port..

    More seriously I can see the appeal for the specific case of a high voltage indictive probe - the down side is it makes it much easier for people to (mis)wire up something that feeds the 24V into the 3.3V, 5V etc

    I purchased 2 each of 8 different inductive sensors - 2 models were rated for 5V - the other 6 models for 10V-30V.

    The performance of the 5V units was decidedly inferior to the 10V-30V units.

    Thus my decision to stick with the far more common 10V-30V units and my suggestion regards the connector.


    The other problem with inductive sensors is there seems to be no standard output configuration.

    I didn't bring this up because I don't know of an simple solution - but I'm working on one.

    To begin with you have NPN or PNP outputs. Then the outputs can be NO or NC.

    Now if these were done sensibly the NPN units would be open collector and pull the signal low, while the PNP units would be open emitter and pull the signal high.

    Then everyone could pick a NPN unit and activate the pull-up on the Duet.

    No such luck.

    I had to come up with a scheme using two resistors for each model to get the signal to match the logic levels of the Duet inputs. The required values and arrangement of the resistors tended to be unique to each model sensor.

    I found it very frustrating.

    Here is how I ended up doing it so I could easily swap probes during testing.
    fcw Inductive Probe Connection.jpg

    I had to make up several different resistor assemblies and use the correct one for each probe.

    Frederick


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