tinyG headers. Enable active low?

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  • January 19, 2017 at 12:34 pm #10182
    kiwigrant
    Member

    Im curious to know why the TinyG didn’t come with Step and direction headers.. Seems like a bit of an inconvenience to add them.

    In thinking about it, because I only step and direction I m wondering why I even went with Tiny8 (V8) – could I have gotten away with and Aduino and loaded the GRBL s/w or the G2 software into a Due and just and picked up step, direction and enable from there.

    As it is Im have to add Voltage shifters on the Step DIR o/p and need to invert the “enable” output.

    I also find it peculiar that the enable is active “low” this doesnt seem to fail safe. i.e. a wire break stops the motors.

    Don’t get me wrong – Not complaining just a bit more work then I had anticipated.

    January 19, 2017 at 7:48 pm #10185
    cmcgrath5035
    Moderator

    TinyG has been around for a while, and was 4-on-board-drivers centric.
    Folks pushing the envelope added external drivers to the mix, and accommodating pins were added.
    GRBL is only 3 motor processing(I believe), but you are correct that G2/DUE are worth considering for users targeting external drivers (up to 6 motors).
    If your chosen external drivers are 5V logic you will have to buffer and level translate DUE as well.

    Enable active low is likely a side effect of using TI drivers.

    January 20, 2017 at 11:10 pm #10186
    kiwigrant
    Member

    Thank you for the response. Im up and running now.

    These learning are part of the fun, and the reason why i started down this road.

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