{"action":"created","issue":{"url":"https://api.github.com/repos/grbl/grbl/issues/1108","repository_url":"https://api.github.com/repos/grbl/grbl","labels_url":"https://api.github.com/repos/grbl/grbl/issues/1108/labels{/name}","comments_url":"https://api.github.com/repos/grbl/grbl/issues/1108/comments","events_url":"https://api.github.com/repos/grbl/grbl/issues/1108/events","html_url":"https://github.com/grbl/grbl/issues/1108","id":182860778,"number":1108,"title":"Question about limits","user":{"login":"109JB","id":10978476,"avatar_url":"https://avatars.githubusercontent.com/u/10978476?v=3","gravatar_id":"","url":"https://api.github.com/users/109JB","html_url":"https://github.com/109JB","followers_url":"https://api.github.com/users/109JB/followers","following_url":"https://api.github.com/users/109JB/following{/other_user}","gists_url":"https://api.github.com/users/109JB/gists{/gist_id}","starred_url":"https://api.github.com/users/109JB/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/109JB/subscriptions","organizations_url":"https://api.github.com/users/109JB/orgs","repos_url":"https://api.github.com/users/109JB/repos","events_url":"https://api.github.com/users/109JB/events{/privacy}","received_events_url":"https://api.github.com/users/109JB/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":2,"created_at":"2016-10-13T18:11:22Z","updated_at":"2016-10-13T23:46:32Z","closed_at":null,"body":"I have my machine wired in such a way that GRBL does not have control of stepper driver enable/disable, so I can't check it directly.  So, my question is, when hard limits are active, and the machine is driven to a point where a limit switch is activated, does GRBL disable the drivers (If they are hooked up that way.) ?  \r\n\r\nOr, does GRBL just halt sending step pulses, leaving the driver enabled?\r\n\r\nThe WIKI only says \"When the switch triggers, it will immediately halt all motion, shutdown the coolant and spindle (if connected), and go into alarm mode, which forces you to check your machine and reset everything.\"\r\n\r\nIt is not clear if the drivers are disabled at this point.\r\n\r\nThank You,\r\n\r\nJohn B."},"comment":{"url":"https://api.github.com/repos/grbl/grbl/issues/comments/253671942","html_url":"https://github.com/grbl/grbl/issues/1108#issuecomment-253671942","issue_url":"https://api.github.com/repos/grbl/grbl/issues/1108","id":253671942,"user":{"login":"109JB","id":10978476,"avatar_url":"https://avatars.githubusercontent.com/u/10978476?v=3","gravatar_id":"","url":"https://api.github.com/users/109JB","html_url":"https://github.com/109JB","followers_url":"https://api.github.com/users/109JB/followers","following_url":"https://api.github.com/users/109JB/following{/other_user}","gists_url":"https://api.github.com/users/109JB/gists{/gist_id}","starred_url":"https://api.github.com/users/109JB/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/109JB/subscriptions","organizations_url":"https://api.github.com/users/109JB/orgs","repos_url":"https://api.github.com/users/109JB/repos","events_url":"https://api.github.com/users/109JB/events{/privacy}","received_events_url":"https://api.github.com/users/109JB/received_events","type":"User","site_admin":false},"created_at":"2016-10-13T23:46:32Z","updated_at":"2016-10-13T23:46:32Z","body":"I have another question/suggestion, at least for the UNO GRBL versions that are limited in the number of available pins.  \r\n\r\nThe default configuration for the pins in GRBL is to have 3 pins for limits, X, Y, and Z.  Freeing up 2 pins is possible by combining all limits to one pin.  For example, using normally closed switches in series, or normally open switches in parallel, they can all be wired to one pin, freeing up the other 2 pins for things such as another axis, or other uses.\r\n\r\nThis could also be set to work for homing as well. If one pin is used for the switches, the homing sequence would require homing only one axis at a time.\r\n\r\nAll that would be lost is the ability to see which limit tripped.\r\n\r\nThis is an option that LinuxCNC allows, but I think it would be extremely beneficial for the UNO based GRBL installs in order to free up a couple pins for other possible uses."}}
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