{"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\/pl\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"Podrobione DS18B20 waterproof: co robi\u0107?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dzie\u0144 dobry! W tym artykule om\u00f3wiona jest problematyka podrabianych czujnik\u00f3w, ograniczenia istniej\u0105cych urz\u0105dze\u0144 korzystaj\u0105cych z tych czujnik\u00f3w oraz rozwi\u0105zanie tego problemu.<\/p>\n

\"Podrobione
\n\u0179r\u00f3d\u0142o: ali-trends.ru<\/i><\/p>\n

Przedtem o podrabianych czujnikach pisano r\u00f3wnie\u017c tutaj<\/a><\/noindex>. Charakterystyczne r\u00f3\u017cnice mi\u0119dzy podrabianymi czujnikami a orygina\u0142ami to:<\/p>\n

    \n
  1. Czujnik, nawet pod\u0142\u0105czony w bezpo\u015bredniej blisko\u015bci, w trybie zasilania paso\u017cytniczego reaguje niepewnie, co drugi raz.<\/li>\n
  2. W trybie zasilania paso\u017cytniczego wysoki poziom odzyskuje si\u0119 zbyt d\u0142ugo (mo\u017cna zmierzy\u0107 mikrokontrolerem lub zobaczy\u0107 oscylogram)<\/li>\n
  3. zu\u017cycie pr\u0105du znacz\u0105co wy\u017csze ni\u017c kilka mikroamper\u00f3w (GND i VCC na minusie, DQ przez mikroamperomierz na +5 volt\u00f3w)<\/li>\n
  4. Po procedurze wyliczania (0xF0) czujniki nie odpowiadaj\u0105 na polecenie odczytu z pami\u0119ci (0xBE)<\/li>\n
  5. Temperatura odczytana z pami\u0119ci po zasilaniu bez polecenia pomiaru r\u00f3\u017cni si\u0119 od 85,0 stopni.<\/li>\n
  6. Warto\u015bci w pami\u0119ci na pozycjach 5 i 7 nie odpowiadaj\u0105 0xFF i 0x10<\/li>\n
  7. Warto\u015bci temperatury (na pierwszych dw\u00f3ch pozycjach pami\u0119ci) odczytane po pierwszym w\u0142\u0105czeniu zasilanego czujnika bez uprzednio podanego polecenia do pomiaru, zwracaj\u0105 poprzedni\u0105 warto\u015b\u0107, a nie 50 05 (85,0 stopni).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nNiestety, nie mam oscyloskopu, a jako stanowisko testowe s\u0142u\u017cy\u0142 GPS-tracker Galileosky BaseBlock Lite. <\/p>\n

    Czujniki zakupiono u r\u00f3\u017cnych sprzedawc\u00f3w, a tylko jedna partia zadzia\u0142a\u0142a w trybie zasilania paso\u017cytniczego. \u0141\u0105cznie zakupiono 5 partii po 50 sztuk.
    \nPozosta\u0142e w og\u00f3le nie dzia\u0142a\u0142y w trybie zasilania paso\u017cytniczego. Terminal nie przewiduje zewn\u0119trznego zasilania dla czujnika, a monta\u017c systemu w samochodzie nale\u017cy maksymalnie upro\u015bci\u0107.<\/p>\n

    Rozwi\u0105zanie problemu<\/h2>\n

    \nTak wi\u0119c czujniki zosta\u0142y zakupione, ale tylko jedna partia zadzia\u0142a\u0142a poprawnie, a rozstrzyganie sprawy i zam\u00f3wienie nowej partii zajmie sporo czasu i wi\u0105za\u0142oby si\u0119 z nadmiernymi kosztami. Dlatego problem trzeba by\u0142o rozwi\u0105za\u0107 samodzielnie.<\/p>\n

    Poniewa\u017c u\u017cywana jest tylko dwoprzewodowa schemat, konieczne jest zorganizowanie zasilania czujnika z przewodu sygna\u0142owego, to znaczy, zorganizowanie zasilania paso\u017cytniczego. Zorganizowa\u0142em zasilanie paso\u017cytnicze wed\u0142ug nast\u0119puj\u0105cego schematu:<\/p>\n

    \"Podrobione
    \n
    \nW tym schemacie poprawiono dzia\u0142anie zasilania paso\u017cytniczego, ale jednocze\u015bnie pozostawiono mo\u017cliwo\u015b\u0107 pod\u0142\u0105czenia zewn\u0119trznego zasilania. Przy tym nieco zmienia si\u0119 schemat po\u0142\u0105cze\u0144: przy po\u0142\u0105czeniach przez zasilanie paso\u017cytnicze, przew\u00f3d Vcc nie u\u017cywane<\/u>.<\/p>\n

    Po z\u0142o\u017ceniu schematu w monta\u017cu przewodowym, czujnik zosta\u0142 wykryty przez terminal przy pojemno\u015bci kondensatora 1 \u00b5F. Dla masowej produkcji zaprojektowano i zam\u00f3wiono panelem p\u0142ytki z zasilaniem paso\u017cytniczym:<\/p>\n

    \"Podrobione
    \n
    \nInteresuj\u0105cy moment:<\/b> do uszczelnienia czujnika producenci mog\u0105 u\u017cywa\u0107 kleju termotopliwego lub silikonu. W pierwszym przypadku mo\u017cna podgrza\u0107 tulej\u0119, wyj\u0105\u0107 czujnik, wprowadzi\u0107 p\u0142ytk\u0119, zwr\u00f3ci\u0107 do tulei i zala\u0107 klejem termotopliwym. W drugim przypadku nie by\u0142o ju\u017c takiej mo\u017cliwo\u015bci, wi\u0119c trzeba by\u0142o przylutowa\u0107 p\u0142ytk\u0119 w pobli\u017cu czujnika, zala\u0107 klejem termotopliwym i na\u0142o\u017cy\u0107 rurk\u0119 termokurczliw\u0105, w wyniku czego ma on taki wygl\u0105d:<\/p>\n

    \"Podrobione
    \n<\/p>\n

    Podsumowanie<\/h2>\n

    \nTutaj chcia\u0142bym wezwa\u0107 producent\u00f3w urz\u0105dze\u0144, aby uwzgl\u0119dnili ten aspekt w swoich produktach, a sprzedawc\u00f3w \u2014 do sprawdzania czujnik\u00f3w przed sprzeda\u017c\u0105 lub ca\u0142kowitego unikania kontaktu z dostawc\u0105, je\u015bli dostarcza on nieoryginalne czujniki, a u\u017cytkownik\u00f3w \u2014 do poruszania tego tematu w komentarzach, listach lub zapytaniach.
    \n
    \u0179r\u00f3d\u0142o:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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