Testing limit switches… unsuccessfully

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  • June 17, 2012 at 5:33 pm #1433
    blurry
    Member

    So far things are well with my Zen Toolworks 7x7x2 and this board. But when I decided to add limit switches I ran into a snag after I enabled limit/homing switches with the following:

    $xSM=2
    $ySM=2
    $zSM=2

    The moment I send the G-Code to move the z-axis (e.g. g00 z10), the board enters into a non-stop reset cycle. When I press in the z-min and z-max switches then things go back to normal (until I tell it to move the axis again). I wired the switches as normally open and have tested them extensively with a continuity tester with no reported ill-affects. I don’t think it is a wiring problem. Is there something else I need to do here? Is the Z-axis set up for normally-closed? Is this a bug in the version shipped (0.93) that was resolved more recently?

    Thanks in advance!

    -Brendan

    June 18, 2012 at 6:46 am #1434
    alden
    Member

    Brendan,

    Try setting the switches to 1 instead of 2 – homing only, no limits. See what this does.
    Ref: http://www.synthetos.com/wiki/index.php?title=TinyG:Configuring

    There is no bug fix related to this issue, but can you tell me what firmware build you are running? The latest build is 338.12 / revision 0.93

    -Alden

    June 18, 2012 at 10:32 am #1435
    blurry
    Member

    #### TinyG version 0.93 (build 338.12) “Fanny Pack” ####
    I don’t see any ill-effects when I use switch mode 1. I haven’t tried any homing yet though, just playing around with g00 commands while I test out the machine. Do I need to put pull-up resistors or anything on the switches? Not that it should matter but these are the ones I wired up.

    Thanks Alden!!

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