{"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\/hr\/blog\/administrirovanie\/server-v-oblakah-itogi-proekta","title":{"rendered":"Server u oblacima: Rezultati projekta","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Prijatelji, vrijeme je da sumiramo na\u0161 projekt-natje\u010daj \u201eServer u oblacima\u201c. Ako netko nije upu\u0107en, pokrenuli smo zabavni geek projekt: izradili smo mali server na Raspberry Pi 3, spojili mu GPS tracker i senzore, smjestili sve to na balon i povjerili ga snagama prirode. Gdje \u0107e se balon sletjeti, znaju samo bogovi vjetra i za\u0161titnici zra\u010dnog letenja, stoga smo svima \u017eeljnima ponudili da postavljaju to\u010dke na karti \u2014 \u010dije to\u010dke budu najbli\u017ee stvarnom mjestu slijetanja, dobit \u0107e \u201eso\u010dne\u201c nagrade.<\/p>\n

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

Dakle, na\u0161 server je ve\u0107 letio u oblacima, i vrijeme je da objavimo rezultate na\u0161eg natje\u010daja.
\n<\/a><\/noindex>
\nLinkovi na prethodne objave o natje\u010daju<\/b><\/p>\n

    \n
  1. Objava o regati<\/a><\/noindex> (nagrada za prvo mjesto u na\u0161em natje\u010daju \u2014 sudjelovanje u jedrili\u010darskoj regati AFR (Another F*cking Race)<\/a><\/noindex>, koja \u0107e se odr\u017eati od 3. do 10. studenog u Saronikom zaljevu (Gr\u010dka) zajedno s timom RUVDS i Habarom.<\/li>\n
  2. Kako smo radili \u201ehardver<\/a><\/noindex>\u201c projekta \u2014 za ljubitelje geek pornografije, s detaljima i razradom koda.<\/li>\n
  3. Megaobjava o projektu<\/a><\/noindex> s potpunim opisom.<\/li>\n
  4. Web stranica projekta<\/noindex>, na kojem se moglo pratiti kretanje balona i telemetriju u realnom vremenu.<\/li>\n
  5. Izvje\u0161taj<\/a><\/noindex> s mjesta lansiranja balona.<\/li>\n<\/ol>\n

    I iskustvo, sine te\u0161kih gre\u0161aka<\/h2>\n

    \nKao \u0161to se sje\u0107ate, planirali smo prenositi podatke s poslu\u017eitelja putem GSM modema. To je bio glavni kanal za prijenos informacija. Mislili smo da smo predvidjeli sve mogu\u0107e nepredvi\u0111ene okolnosti s pokriveno\u0161\u0107u mobilne mre\u017ee, umetnuv\u0161i u modem dvije SIM kartice operatora s najboljom pokriveno\u0161\u0107u u Dmitrovskom okrugu. Uz to, modem je imao dobru omnidirekcijsku antenu. No, kao \u0161to se ka\u017ee, \u010dovjek planira, a operateri realiziraju. Kada se balon uzdigao iznad 500 metara (visina Ostanjinske televizijske kule), mobilna veza potpuno je nestala. <\/p>\n

    \"Server
    \n
    \nRazmi\u0161ljaju\u0107i unazad, to se \u010dini o\u010diglednim, ali tako je to s povratnom informacijom. Naravno, mobilne antene su namijenjene pokrivanju tla, a ne zraka. Njihove karakteristike usmjerenosti \u201eudaraju\u201c du\u017e terena i u oblake ne \u201esvijetle\u201c. Dakle, mobilni signal na visini od pol kilometra i vi\u0161e \u2014 to je samo slu\u010dajno odbijanje petlje neke antene. Tako da polovinu rute veze s balonom putem mobilne mre\u017ee nije bilo. A pri spu\u0161tanju, kada smo se spustili ispod 500 metara, mobilna veza ponovno je proradila.<\/p>\n

    Kako smo dobijali telemetriju sa balona? Hvala duplom kanalu za prenos podataka. Na balonu smo postavili komplet LoRa-radijske veze<\/a><\/noindex>, koji radi na frekvenciji 433 MHz. <\/p>\n

    \"Server
    \n
    \nPropusnost nije velika, ali za na\u0161e potrebe je bila dovoljno dobra. \u0160to se ti\u010de odre\u0111ivanja lokacije balona putem GPS-a, tu nije bilo problema, traker je radio besprijekorno.<\/p>\n

    \"Server
    \n
    \nOsim toga, tokom leta se pokazalo da je USB kabl koji je spajao telemetrijski modul sa Raspberry Pi 3 bio neispravan. Na zemlji je radio, a u vazduhu je otkazao. Verovatno se upla\u0161io visine. Gre\u0161ku u kablu smo otkrili tek nakon slijetanja. Na sre\u0107u, uspjeli smo uspostaviti prenos podataka direktno sa telemetrijskog modula putem LoRa.<\/p>\n

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

    I dobra strana<\/h2>\n

    \nSre\u0107a se osmehnula korisnicima Habr @severov_info<\/a><\/noindex> (prvo mesto), @MAXXL<\/a><\/noindex> (drugo mesto) i @evzor<\/a><\/noindex> (tre\u0107e mesto)! Najsre\u0107nijeg u novembru o\u010dekuje hrpa utisaka (nadamo se, prijatnih) od u\u010de\u0161\u0107a u jedrili\u010darskoj regati AFR<\/a><\/noindex>, a vlasnicima drugog i tre\u0107eg mesta uskoro \u0107emo podeliti dobre pametne telefone. I naravno, svima trojici u poklon besplatna najam virtuelnog servera od RUVDS.<\/p>\n

    \"Server
    \n
    \n\"Server
    \n
    \nKako je pro\u0161lo lansiranje mo\u017eete pogledati u ovom malom videu: <\/p>\n

    \r\n \"Pogledajte\r\n
    <\/div>\r\n <\/div><\/center>
    \n
    Izvor:     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 u oblacima: Rezultati projekta | ProHoster","description":"Prijatelji, vreme je da sumiramo rezultate na\u0161eg projekta-takmi\u010denja \u201eServer u 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