{"id":38728,"date":"2019-10-31T22:25:33","date_gmt":"2019-10-31T19:25:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/poddelnye-ds18b20-waterproof-chto-delat\/"},"modified":"2019-10-31T22:25:33","modified_gmt":"2019-10-31T19:25:33","slug":"poddelnye-ds18b20-waterproof-chto-delat","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"La\u017eni DS18B20 waterproof: \u0161to u\u010diniti?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dobar dan! Ovaj \u010dlanak se bavi problemom la\u017enih senzora, ograni\u010denjima postoje\u0107ih ure\u0111aja koji koriste te senzore i rje\u0161enjem ovog problema.<\/p>\n

\"La\u017eni
\nIzvor: ali-trends.ru<\/i><\/p>\n

O la\u017enim senzorima se ranije pisalo tako\u0111e i ovdje<\/a><\/noindex>. Karakteristi\u010dne razlike izme\u0111u la\u017enih senzora i originala:<\/p>\n

    \n
  1. Senzor, \u010dak i kada je povezan u neposrednoj blizini, u re\u017eimu parazitske napajanja reagira nesigurno, svako malo.<\/li>\n
  2. U re\u017eimu parazitske napajanja visoki nivo se obnavlja predugo (mo\u017ee se mjeriti mikrokontrolerom ili gledati oscilogram)<\/li>\n
  3. potro\u0161nja struje je znatno ve\u0107a od nekoliko mikroampera (GND i VCC na minus, DQ preko mikroampermetra na +5 volti)<\/li>\n
  4. Nakon procedure nabrajanja (0xF0) senzori ne odgovaraju na komandu za \u010ditanje scratchpada (0xBE)<\/li>\n
  5. Temperatura pro\u010ditana sa scratchpada nakon napajanja bez komande mjerenja razlikuje se od 85,0 stepeni.<\/li>\n
  6. Vrijednosti na scratchpadu na pozicijama 5 i 7 ne odgovaraju 0xFF i 0x10<\/li>\n
  7. Vrijednosti temperature (na prva dva polo\u017eaja scratchpada) pro\u010ditane nakon prvog uklju\u010divanja bez napajanja senzora bez prethodno poslane komande za mjerenje, vra\u0107aju prethodnu vrijednost, a ne 50 05 (85.0 stepeni).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nNa\u017ealost, nemam osciloskop, a za ispitivanje sam koristio GPS-traker Galileosky BaseBlock Lite. <\/p>\n

    Senzori su kupljeni od razli\u010ditih prodava\u010da, i samo jedna serija je radila na parazitsko napajanje. Kupljeno je ukupno 5 serija po 50 komada.
    \nOstale nisu radile na parazitsko napajanje uop\u0161te. Terminal ne predvi\u0111a vanjsko napajanje za senzor, a monta\u017ea sistema na automobil treba maksimalno pojednostaviti.<\/p>\n

    Rje\u0161enje problema<\/h2>\n

    \nDakle, senzori su kupljeni, ali samo jedna serija je ispravno radila, a razja\u0161njavanje i naru\u010divanje nove serije bi oduzelo zna\u010dajno vrijeme i rezultiralo bi prekomjernim tro\u0161kovima. Stoga smo morali sami rije\u0161iti problem.<\/p>\n

    Budu\u0107i da se koristi samo dvo\u017ei\u010dana shema, potrebno je organizirati napajanje senzora iz signalnog voda, tj. organizirati parazitsko napajanje. Organizovao sam parazitsko napajanje prema sljede\u0107oj shemi:<\/p>\n

    \"La\u017eni
    \n
    \nU ovoj shemi pobolj\u0161an je rad parazitske napajanja, ali je istovremeno ostavljena mogu\u0107nost povezivanja spoljnog napajanja. Pri tome se malo menja shema povezivanja: prilikom priklju\u010denja putem parazitskog napajanja koristi se \u017eica Vcc nije kori\u0161\u0107eno<\/u>.<\/p>\n

    Nakon sastavljanja schematske plo\u010de, senzor je prepoznat od strane terminala sa kapacitetom kondenzatora od 1 \u03bcF. Za masovnu primenu projektovane su i poru\u010dene panelne plo\u010de sa parazitskim napajanjem:<\/p>\n

    \"La\u017eni
    \n
    \nInteresantan trenutak:<\/b> za zaptivanje senzora proizvo\u0111a\u010di mogu koristiti termalno lepak ili silikon. U prvom slu\u010daju mo\u017ee se zagrijati cev, izvu\u0107i senzor, implementirati plo\u010du, vratiti u cev i jo\u0161 jednom zaliti termalnim lepakom. U drugom to ve\u0107 ne\u0107e biti mogu\u0107e, i plo\u010da je morala biti pri\u010dvr\u0161\u0107ena u blizini senzora, zalivena termalnim lepakom i stavljena termoobloga, u rezultat on izgleda ovako:<\/p>\n

    \"La\u017eni
    \n<\/p>\n

    Zaklju\u010dak<\/h2>\n

    \nOvde bih \u017eeleo pozvati proizvo\u0111a\u010de ure\u0111aja da obrate pa\u017enju na ovaj trenutak u svojim proizvodima, a prodavce da proveravaju senzore pre prodaje ili uop\u0161te da ne sara\u0111uju sa dobavlja\u010dima koji isporu\u010duju falsifikovane senzore, dok korisnike pozivam da osvetle ovu temu u komentarima, pismima ili pritu\u017ebama.
    \n
    Izvor:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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