{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10142","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10142/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10142/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10142/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/10142","id":306182644,"number":10142,"title":"[FR] Relay output to trigger on thermal runaway","user":{"login":"bipsendk","id":8531428,"avatar_url":"https://avatars0.githubusercontent.com/u/8531428?v=4","gravatar_id":"","url":"https://api.github.com/users/bipsendk","html_url":"https://github.com/bipsendk","followers_url":"https://api.github.com/users/bipsendk/followers","following_url":"https://api.github.com/users/bipsendk/following{/other_user}","gists_url":"https://api.github.com/users/bipsendk/gists{/gist_id}","starred_url":"https://api.github.com/users/bipsendk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bipsendk/subscriptions","organizations_url":"https://api.github.com/users/bipsendk/orgs","repos_url":"https://api.github.com/users/bipsendk/repos","events_url":"https://api.github.com/users/bipsendk/events{/privacy}","received_events_url":"https://api.github.com/users/bipsendk/received_events","type":"User","site_admin":false},"labels":[{"id":870682925,"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/C:%20Safety","name":"C: Safety","color":"006b75","default":false},{"id":91737852,"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/T:%20Feature%20Request","name":"T: Feature Request","color":"1d76db","default":false}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2018-03-17T19:15:12Z","updated_at":"2018-03-19T09:15:21Z","closed_at":"2018-03-19T00:53:33Z","author_association":"NONE","body":"### Description\r\n\r\nOptional Relay control of power to hotend(s)/heated bed if thermal runaway\r\n\r\n#### Additional Information\r\n\r\nIt would be desirable to be able to specify a pin, that could be used to switch off a relay if thermal runaway was detected.\r\n\r\nfor example (on a RAMPS board)\r\n\r\n#define PIN_RELAY_POWERCONTROL 44\r\n\r\nThis would specify to use D44 on AUX2 for relay power control.\r\n\r\nWhen the printer is powered on, the designated output should go high to switch a relay on. The relay controls the power to the mosfets driving the heated bed and the hotend(s).\r\n\r\nIf a thermal runaway is detected, the output pin should change state to low to switch the relay off - and cut power completely to the mosfets.\r\n\r\n The reason for adding a relay before the mosfets is that if a mosfet fails, it will typically to so in a closed state (thereby still supplying power to a connected device with the risk of overheating/igniting a fire).\r\nIf power to the mosfets is controlled by a relay, it will be possible to cut power completely - even if a mosfet has failed.\r\n\r\n"},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/374146356","html_url":"https://github.com/MarlinFirmware/Marlin/issues/10142#issuecomment-374146356","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/10142","id":374146356,"user":{"login":"AnHardt","id":211931,"avatar_url":"https://avatars2.githubusercontent.com/u/211931?v=4","gravatar_id":"","url":"https://api.github.com/users/AnHardt","html_url":"https://github.com/AnHardt","followers_url":"https://api.github.com/users/AnHardt/followers","following_url":"https://api.github.com/users/AnHardt/following{/other_user}","gists_url":"https://api.github.com/users/AnHardt/gists{/gist_id}","starred_url":"https://api.github.com/users/AnHardt/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AnHardt/subscriptions","organizations_url":"https://api.github.com/users/AnHardt/orgs","repos_url":"https://api.github.com/users/AnHardt/repos","events_url":"https://api.github.com/users/AnHardt/events{/privacy}","received_events_url":"https://api.github.com/users/AnHardt/received_events","type":"User","site_admin":false},"created_at":"2018-03-19T09:15:21Z","updated_at":"2018-03-19T09:15:21Z","author_association":"CONTRIBUTOR","body":"I'm talking about power supplies being internally pulled up/down to be off\r\nand floating output of the `PS_ON` pin does not matter if working at all."}}
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