{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2763","repository_url":"https://api.github.com/repos/MarlinFirmware/Marlin","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2763/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2763/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2763/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2763","id":115611446,"number":2763,"title":"Heated bed temperature out of control","user":{"login":"ProgrammedSoul","id":4493654,"avatar_url":"https://avatars.githubusercontent.com/u/4493654?v=3","gravatar_id":"","url":"https://api.github.com/users/ProgrammedSoul","html_url":"https://github.com/ProgrammedSoul","followers_url":"https://api.github.com/users/ProgrammedSoul/followers","following_url":"https://api.github.com/users/ProgrammedSoul/following{/other_user}","gists_url":"https://api.github.com/users/ProgrammedSoul/gists{/gist_id}","starred_url":"https://api.github.com/users/ProgrammedSoul/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ProgrammedSoul/subscriptions","organizations_url":"https://api.github.com/users/ProgrammedSoul/orgs","repos_url":"https://api.github.com/users/ProgrammedSoul/repos","events_url":"https://api.github.com/users/ProgrammedSoul/events{/privacy}","received_events_url":"https://api.github.com/users/ProgrammedSoul/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Potential%20bug?","name":"Potential bug?","color":"eb6420"}],"state":"open","locked":false,"assignee":null,"milestone":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/milestones/43","html_url":"https://github.com/MarlinFirmware/Marlin/milestones/Heaters","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/milestones/43/labels","id":1427098,"number":43,"title":"Heaters","description":"","creator":{"login":"AnHardt","id":211931,"avatar_url":"https://avatars.githubusercontent.com/u/211931?v=3","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},"open_issues":5,"closed_issues":0,"state":"open","created_at":"2015-11-24T11:55:36Z","updated_at":"2015-11-24T13:00:36Z","due_on":null,"closed_at":null},"comments":33,"created_at":"2015-11-06T23:27:26Z","updated_at":"2016-02-21T13:42:43Z","closed_at":null,"body":"![default](https://cloud.githubusercontent.com/assets/4493654/11011105/ddfcb772-84b2-11e5-80b0-4aa78fa30124.JPG)\r\n\r\nI was using Marlin 1.0.2 and i got this issue, then I updated to Marlin 1.1.0-RC see if it fix it, the answer is no.\r\nBasically what happened is, when the heated bed reached the target temperature, it stays on that temperature normally. However, the moment the motors starts to move the heated bed begins to heat as much as it can reach. I tried bang-bang and PID config both, nothing changed.\r\nAlso it seems that heated bed heats up slower in 1.1.0=RC than it would do in 1.0.2, you can see that from the heating curve of the bed (before and after it goes out of control....).\r\nThe hardware is Printrboard Rev.D, controlled by a Raspberry Pi B2 with Octoprint. The temperature sensor on heated bed is a 10k sensor that I borrowed from my lab. The heated bed is a home made heated bed, heated by five 32 gauge nichrome wire in parallel, with a total resistance of 1.7ohm."},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/186824830","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2763#issuecomment-186824830","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2763","id":186824830,"user":{"login":"AnHardt","id":211931,"avatar_url":"https://avatars.githubusercontent.com/u/211931?v=3","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":"2016-02-21T13:42:43Z","updated_at":"2016-02-21T13:42:43Z","body":"If FastIO and Arduino pin mappings are different we need a mapping-table.\r\nNormally we use FastIO pin mapping in our pin files. `analogWrite()` `digitalWrite` `digitalRead()` use Arduino pin mapping.  `digitalWrite` `digitalRead()` can be replaced (if the pin is known at compile time (not a variable)) by `READ()` `WRITE()` from FastIO. There is no replacement for `analogWrite()`.\r\nSo if we do not have and use adapted `pins_arduino.h` files in the core we have to use an extra mapping.\r\n\r\nStill a bit confusing to me. So no real idea how to fix."}}