Limit Switchs

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  • May 1, 2012 at 6:33 pm #1183
    Cbrucks
    Member

    Good evening, Love what your doing! I plan on getting a tinyg and replacing my cuttent Xylotex and pc setup as i’d like to use USB for comms. I’ve looked over the schematic, through all the posts and documentation I can find, and nothing is mentioned about limit/home switches. The same is true about estop. Are they implemented and if so where do I find information on wireing them to tinyg.

    This would also have implications an the GUI being developed, so unless I missed it some where and i may have, I think these are fairly important things to discuss.

    Thanks
    Chuck

    May 1, 2012 at 10:54 pm #1184
    alden
    Member

    Thanks for the support. Check the wiki for limit switches here for hardware:
    http://www.synthetos.com/wiki/index.php?title=Projects:TinyG-Hardware-Info:#Interface_Pinouts

    and here for configuring the switches:
    http://www.synthetos.com/wiki/index.php?title=TinyG:Configuring#Axis_Settings

    Please be aware that even though the pinouts are broken out by axis, currently any switch will fire a homing or limit operation. So technically they could all connect to a single pin. Also, the switches are Normally Open operation. There are plans to make this more sophisticated, but for now it gets the job done.

    There is actually no such thing as eStop, as a real emergency stop would have to cut power to the motors, and the controller board (TinyG) cannot do that. But you can reset the board by using the reset button. These are not brought out to any pins, however. You can force the reset in software by sending the board a control-X character.

    Alden

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