{"action":"created","issue":{"url":"https://api.github.com/repos/sinara-hw/Booster/issues/76","repository_url":"https://api.github.com/repos/sinara-hw/Booster","labels_url":"https://api.github.com/repos/sinara-hw/Booster/issues/76/labels{/name}","comments_url":"https://api.github.com/repos/sinara-hw/Booster/issues/76/comments","events_url":"https://api.github.com/repos/sinara-hw/Booster/issues/76/events","html_url":"https://github.com/sinara-hw/Booster/issues/76","id":357975289,"node_id":"MDU6SXNzdWUzNTc5NzUyODk=","number":76,"title":"I2C review","user":{"login":"hartytp","id":21218399,"node_id":"MDQ6VXNlcjIxMjE4Mzk5","avatar_url":"https://avatars0.githubusercontent.com/u/21218399?v=4","gravatar_id":"","url":"https://api.github.com/users/hartytp","html_url":"https://github.com/hartytp","followers_url":"https://api.github.com/users/hartytp/followers","following_url":"https://api.github.com/users/hartytp/following{/other_user}","gists_url":"https://api.github.com/users/hartytp/gists{/gist_id}","starred_url":"https://api.github.com/users/hartytp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hartytp/subscriptions","organizations_url":"https://api.github.com/users/hartytp/orgs","repos_url":"https://api.github.com/users/hartytp/repos","events_url":"https://api.github.com/users/hartytp/events{/privacy}","received_events_url":"https://api.github.com/users/hartytp/received_events","type":"User","site_admin":false},"labels":[{"id":1053203029,"node_id":"MDU6TGFiZWwxMDUzMjAzMDI5","url":"https://api.github.com/repos/sinara-hw/Booster/labels/hardware","name":"hardware","color":"d5ccff","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":{"url":"https://api.github.com/repos/sinara-hw/Booster/milestones/1","html_url":"https://github.com/sinara-hw/Booster/milestone/1","labels_url":"https://api.github.com/repos/sinara-hw/Booster/milestones/1/labels","id":3649666,"node_id":"MDk6TWlsZXN0b25lMzY0OTY2Ng==","number":1,"title":"v1.2","description":null,"creator":{"login":"hartytp","id":21218399,"node_id":"MDQ6VXNlcjIxMjE4Mzk5","avatar_url":"https://avatars0.githubusercontent.com/u/21218399?v=4","gravatar_id":"","url":"https://api.github.com/users/hartytp","html_url":"https://github.com/hartytp","followers_url":"https://api.github.com/users/hartytp/followers","following_url":"https://api.github.com/users/hartytp/following{/other_user}","gists_url":"https://api.github.com/users/hartytp/gists{/gist_id}","starred_url":"https://api.github.com/users/hartytp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hartytp/subscriptions","organizations_url":"https://api.github.com/users/hartytp/orgs","repos_url":"https://api.github.com/users/hartytp/repos","events_url":"https://api.github.com/users/hartytp/events{/privacy}","received_events_url":"https://api.github.com/users/hartytp/received_events","type":"User","site_admin":false},"open_issues":26,"closed_issues":0,"state":"open","created_at":"2018-09-12T19:16:24Z","updated_at":"2018-09-13T11:03:14Z","due_on":null,"closed_at":null},"comments":14,"created_at":"2018-09-07T08:45:26Z","updated_at":"2018-09-15T22:01:28Z","closed_at":null,"author_association":"COLLABORATOR","body":"@gkasprow @wizath before we begin production of Booster v1.2 please can you do a complete review of the I2C chips, including the temperature sensors?\r\n\r\nThe reason I ask for this is that a couple of times, we've seen issues which may relate to the I2C chips. For example, once the over temperature alarm tripped when the chassis was only at around 30C. I suspect that this was due to an incorrect reading from the temperature sensor (could also have been a firmware bug). I haven't been able to reproduce that issue since, so it's hard to determine what caused it.\r\n\r\nI think we should check:\r\n- Voltage ratings for all pins for the I2C chips, in particular the temperature sensor\r\n- bus/converter timings\r\n- decoupling\r\n- load impedance (including capacitors and any filters/ferrites)\r\n- probably also worth using a scope to probe the bus to check signal rise times and any potential interference\r\n- any grounding issues\r\n- etc"},"comment":{"url":"https://api.github.com/repos/sinara-hw/Booster/issues/comments/421642201","html_url":"https://github.com/sinara-hw/Booster/issues/76#issuecomment-421642201","issue_url":"https://api.github.com/repos/sinara-hw/Booster/issues/76","id":421642201,"node_id":"MDEyOklzc3VlQ29tbWVudDQyMTY0MjIwMQ==","user":{"login":"hartytp","id":21218399,"node_id":"MDQ6VXNlcjIxMjE4Mzk5","avatar_url":"https://avatars0.githubusercontent.com/u/21218399?v=4","gravatar_id":"","url":"https://api.github.com/users/hartytp","html_url":"https://github.com/hartytp","followers_url":"https://api.github.com/users/hartytp/followers","following_url":"https://api.github.com/users/hartytp/following{/other_user}","gists_url":"https://api.github.com/users/hartytp/gists{/gist_id}","starred_url":"https://api.github.com/users/hartytp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hartytp/subscriptions","organizations_url":"https://api.github.com/users/hartytp/orgs","repos_url":"https://api.github.com/users/hartytp/repos","events_url":"https://api.github.com/users/hartytp/events{/privacy}","received_events_url":"https://api.github.com/users/hartytp/received_events","type":"User","site_admin":false},"created_at":"2018-09-15T22:01:28Z","updated_at":"2018-09-15T22:01:28Z","author_association":"COLLABORATOR","body":"> There are 3 such LEDs on rach channel, which LEDs do you mean ?\r\n> The only red LED is connected to the output of the voltage/current supervisor chip.\r\n\r\nRight: AFAICT, there is only 1 LED and that was the one that seemed to go off on some channels when we had this fault (no channels produce any readings on the I2C bus).\r\n\r\n> @wizath what levels did U program and what action CPU does when ALERT signal is present? Maybe the levels are too small.\r\n\r\nMaybe, but I don't think that explains it. This issue only seems to be mechanical since it was fixed by taking all the modules out and then reinserting it. After fixing the issue, it appeared again once we tightened up the screws. So, if a current limit was exceeded it sounds more like something being shorted.\r\n\r\n> @hartytp are the three remaining green LEDs on on the main board for faulty channels?\r\n\r\nI'm afraid I don't know. We didn't do too much debugging on this issue -- all the Boosters we have are needed urgently in our experiments so we don't have a spare one to do any debugging on. \r\n\r\nI wonder if this is related to the issue we had on the other Booster v1.1 that we have, where one channel was only detected by the firmware when the lid was placed on it."}}
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