{"id":30490,"date":"2019-10-31T21:35:49","date_gmt":"2019-10-31T18:35:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/server-v-oblakah-itogi-proekta\/"},"modified":"2019-10-31T21:35:49","modified_gmt":"2019-10-31T18:35:49","slug":"server-v-oblakah-itogi-proekta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/administrirovanie\/server-v-oblakah-itogi-proekta","title":{"rendered":"Server in the Clouds: Project Results","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Venner, det er p\u00e5 tide at opsummere vores projekt-konkurrence \"Server i skyerne\". Hvis nogen ikke er bekendt med det, har vi lavet et sjovt geek-projekt: vi har lavet en lille server p\u00e5 en Raspberry Pi 3, tilsluttet en GPS-tracker og sensorer, lastet det hele op p\u00e5 en luftballon og overladt det til naturens kr\u00e6fter. Hvor ballonen lander, er kun kendt af vindens guder og luftfartens skytshelgen, derfor har vi opfordret alle interesserede til at placere punkter p\u00e5 kortet \u2014 de hvis punkter er t\u00e6ttest p\u00e5 det faktiske landingsted, vinder l\u00e6kre pr\u00e6mier.<\/p>\n

\"Server<\/a><\/noindex><\/p>\n

S\u00e5 vores server har allerede v\u00e6ret oppe i skyerne, og det er tid til at opsummere vores konkurrence.
\n<\/a><\/noindex>
\nLinks til tidligere publikationer om konkurrencen<\/b><\/p>\n

    \n
  1. Indl\u00e6gget om regattaen<\/a><\/noindex> (pr\u00e6mien for f\u00f8rstepladsen i vores konkurrence \u2014 deltagelse i en sejlads AFR (Another F*cking Race)<\/a><\/noindex>, der finder sted fra den 3. til den 10. november i Saroniske bugt (Gr\u00e6kenland) sammen med teamet RUVDS og Habr.<\/li>\n
  2. Hvordan vi lavede \"den h\u00e5rde del<\/a><\/noindex>\" af projektet \u2014 for elskere af geek-porno, med detaljer og kodeanalyse.<\/li>\n
  3. Megaindl\u00e6g om projektet<\/a><\/noindex> med en fuld beskrivelse.<\/li>\n
  4. Projektets hjemmeside<\/noindex>, hvor man kunne f\u00f8lge bev\u00e6gelsen af ballonen og telemetri i realtid.<\/li>\n
  5. Reportage<\/a><\/noindex> fra opsendelsesstedet for ballonen.<\/li>\n<\/ol>\n

    Og erfaringen, s\u00f8nnen af sv\u00e6re fejl<\/h2>\n

    \nSom I husker, havde vi planlagt at transmittere data fra serveren via GSM-modem. Dette var den prim\u00e6re kommunikationskanal. Vi troede, vi havde taget h\u00f8jde for alle uforudsete h\u00e6ndelser med d\u00e6kning af mobilnettet ved at inds\u00e6tte to SIM-kort fra operat\u00f8rer med den bedste d\u00e6kning i Dmitrov-distriktet. Desuden havde modemet en god omnidirektionel antenne. Men som man siger, mennesket planl\u00e6gger, mens operat\u00f8rerne disponer. Da ballonen steg over 500 meter (h\u00f8jden p\u00e5 Ostankino-tv-t\u00e5rnet), forsvandt mobilforbindelsen fuldst\u00e6ndig. <\/p>\n

    \"Server
    \n
    \nN\u00e5r man t\u00e6nker tilbage, synes det indlysende, men det er jo derfor, det hedder bagudskuende. Selvf\u00f8lgelig er mobilantenner designet til d\u00e6kning p\u00e5 jorden, ikke i luften. Deres str\u00e5lingsdiagrammer \"rammer\" langs terr\u00e6net og \"lyser\" ikke op i skyerne. S\u00e5 mobilforbindelse h\u00f8jt oppe, halv kilometer og derover, er kun en tilf\u00e6ldig tilbage-refleksion fra en eller anden antennes blomst. S\u00e5 halvdelen af forbindelsesruten med ballonen via mobilnettet eksisterede ikke. Men under nedstigningen, da vi kom under 500 meter, fungerede mobilforbindelsen igen.<\/p>\n

    Hvordan fik vi telemetri fra bolden? Det skal vi takke den redundante datakanal for. Vi satte et kit LoRa-radio<\/a><\/noindex>, der arbejder p\u00e5 en frekvens af 433 MHz. <\/p>\n

    \"Server
    \n
    \nB\u00e5ndbredden er ikke stor, men til vores opgaver var det helt tilstr\u00e6kkeligt. Og hvad ang\u00e5r at bestemme boldens position via GPS, var der slet ingen problemer, tracker virkede uden problemer.<\/p>\n

    \"Server
    \n
    \nOg det viste sig under flyvningen, at USB-kablet, der forbinder telemetrimodulet med Raspberry Pi 3, var defekt. Det fungerede p\u00e5 jorden, men svigtede i luften. M\u00e5ske blev det skr\u00e6mt af h\u00f8jden. \u00c5rsagen til kabelsvigt fandt vi f\u00f8rst efter landing. Heldigvis lykkedes det at etablere datatransmission direkte fra telemetrimodulet via LoRa.<\/p>\n

    \"Server
    \n
    \n\"Server
    \n
    \n\"Server
    \n<\/p>\n

    Og til det gode<\/h2>\n

    \nHeldet smilede til Habra-brugerne @severov_info<\/a><\/noindex> (f\u00f8rste plads), @MAXXL<\/a><\/noindex> (anden plads) og @evzor<\/a><\/noindex> (tredje plads)! Den heldigste i november vil f\u00e5 en masse oplevelser (forh\u00e5bentlig behagelige) fra deltagelse i AFR-sejladsen<\/a><\/noindex>, og indehaverne af anden og tredje plads vil snart modtage gode smartphones. Og selvf\u00f8lgelig f\u00e5r alle tre en gratis leje af en virtuel server fra RUVDS som gave.<\/p>\n

    \"Server
    \n
    \n\"Server
    \n
    \nHvordan lanceringen forl\u00f8b kan ses i denne lille video: <\/p>\n

    \r\n \"Afspil\r\n
    <\/div>\r\n <\/div><\/center>
    \n
    Kilde:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":22488,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-30490","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Server i skyerne: Projektresultater | ProHoster","description":"Venner, det er tid til at opsummere vores projekt-konkurrence 'Server i 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