{"action":"opened","issue":{"url":"https://api.github.com/repos/nolanholden/payload-level1-rocket/issues/5","repository_url":"https://api.github.com/repos/nolanholden/payload-level1-rocket","labels_url":"https://api.github.com/repos/nolanholden/payload-level1-rocket/issues/5/labels{/name}","comments_url":"https://api.github.com/repos/nolanholden/payload-level1-rocket/issues/5/comments","events_url":"https://api.github.com/repos/nolanholden/payload-level1-rocket/issues/5/events","html_url":"https://github.com/nolanholden/payload-level1-rocket/issues/5","id":240748291,"number":5,"title":"Investigate and resolve the cause for high-sampling rate issues with GPS module.","user":{"login":"nolanholden","id":25624592,"avatar_url":"https://avatars2.githubusercontent.com/u/25624592?v=3","gravatar_id":"","url":"https://api.github.com/users/nolanholden","html_url":"https://github.com/nolanholden","followers_url":"https://api.github.com/users/nolanholden/followers","following_url":"https://api.github.com/users/nolanholden/following{/other_user}","gists_url":"https://api.github.com/users/nolanholden/gists{/gist_id}","starred_url":"https://api.github.com/users/nolanholden/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nolanholden/subscriptions","organizations_url":"https://api.github.com/users/nolanholden/orgs","repos_url":"https://api.github.com/users/nolanholden/repos","events_url":"https://api.github.com/users/nolanholden/events{/privacy}","received_events_url":"https://api.github.com/users/nolanholden/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-07-05T19:13:33Z","updated_at":"2017-07-05T19:13:33Z","closed_at":null,"body":"Testing has shown that high sampling rates of the GPS receiver cause the cessation of new _fixes_ (and GPS date, and other data from the satellites).\r\n_This can be seen by building the project at this commit:_ https://github.com/nolanholden/payload-level1-rocket/commit/6aa457c37554e53351b3681e5a2015b56ef33ba2\r\n\r\nFor example:\r\n```\r\nOpening port\r\nPort open\r\nVMDPV_1|1_VMDPV\r\nIn setup.\r\nSuccess: SD card ready.\r\nSetting up output files...\r\nSetup complete.\r\nOpening port\r\nPort open\r\nVMDPV_1|1_VMDPV\r\nIn setup.\r\nSuccess: SD card ready.\r\nSetting up output files...\r\nSetup complete.\r\nsats   hdop   lat          long     fix-age   date      time   (... and friends ...)\r\n9    ,89   ,38.218971  ,-85.753220  ,0    ,07/05/2017,19:04:05,1097 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,720   ,9         ,0        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,513  ,07/05/2017,19:04:05,1610 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,783   ,9         ,1        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,1026 ,07/05/2017,19:04:05,2123 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,846   ,9         ,1        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,1538 ,07/05/2017,19:04:05,2635 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,909   ,9         ,1        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,2051 ,07/05/2017,19:04:05,3148 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,972   ,9         ,1        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,2564 ,07/05/2017,19:04:05,3661 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1035  ,9         ,2        ,\r\n// Above, the \"fix age\" grew to 2564 milliseconds. (i.e., no new fixes completely arrived for 2.5 seconds)\r\n// This is absolutely unacceptable. \r\n9    ,89   ,38.218971  ,-85.753220  ,1    ,07/05/2017,19:04:09,4174 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1098  ,10        ,2        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,513  ,07/05/2017,19:04:09,4686 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1161  ,10        ,3        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,1026 ,07/05/2017,19:04:09,5199 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1224  ,10        ,4        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,1539 ,07/05/2017,19:04:09,5712 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1287  ,10        ,4        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,2051 ,07/05/2017,19:04:09,6225 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1350  ,10        ,5        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,2564 ,07/05/2017,19:04:09,6737 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1413  ,10        ,5        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,3077 ,07/05/2017,19:04:09,7250 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1476  ,10        ,6        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,3590 ,07/05/2017,19:04:09,7763 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1543  ,10        ,6        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,4102 ,07/05/2017,19:04:09,8275 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1606  ,10        ,7        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,4615 ,07/05/2017,19:04:09,8788 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1669  ,10        ,8        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,5128 ,07/05/2017,19:04:09,9301 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1732  ,10        ,9        ,\r\n9    ,89   ,38.218971  ,-85.753220  ,5640 ,07/05/2017,19:04:09,9814 ,153.50 ,261.06 ,0.11  ,W     ,9620     ,92.61  ,E     ,1795  ,10        ,10       ,\r\n// Again, \"fix age\" grew to 5640 milliseconds.\r\n// Very unacceptable. \r\n```\r\n- Is the library in-use the sole cause?\r\n    - If so, how can we mitigate?\r\n- Is is because high sampling rates may cause us to fail to completely read NMEA sentences?\r\n    - If so, can we increase data rate at any bottleneck?"}}
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