{"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\/sl\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"Sensores DS18B20 waterproof falsificados: \u00bfqu\u00e9 hacer?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Lep pozdrav! V tem \u010dlanku je predstavljena te\u017eava s ponarejenimi senzorji, omejitvami obstoje\u010dih naprav, ki uporabljajo te senzorje, in re\u0161itvijo te te\u017eave.<\/p>\n

\"Sensores
\nVir: ali-trends.ru<\/i><\/p>\n

O ponarejenih senzorjih so \u017ee pisali pred menoj ovde<\/a><\/noindex>. Zna\u010dilne razlike med ponarejenimi senzorji in originali:<\/p>\n

    \n
  1. Senzor, tudi \u010de je povezan v neposredni bli\u017eini, se v na\u010dinu parazitske napajanja odziva negotovo, ob\u010dasno.<\/li>\n
  2. V na\u010dinu parazitske napajanja se visok nivo obnavlja predolgo (lahko se meri s mikrokrmilnikom ali opazuje oscilogram)<\/li>\n
  3. poraba toka je znatno vi\u0161ja od nekaj mikroamperov (GND in VCC na minus, DQ preko mikroampermeterja na +5 voltov)<\/li>\n
  4. Po postopku na\u0161tevanja (0xF0) se senzorji ne odzivajo na ukaz za branje iz skr\u010dpad (0xBE)<\/li>\n
  5. Temperatura, prebrana iz skr\u010dpad po vklopu brez ukaza za merjenje, se razlikuje od 85,0 stopinj.<\/li>\n
  6. Vrednosti v skr\u010dpadu na polo\u017eajih 5 in 7 ne ustrezajo 0xFF in 0x10<\/li>\n
  7. Vrednosti temperature (na prvih dveh polo\u017eajih skr\u010dpada) prebrane po prvem vklopu neaktiviranega senzorja brez predhodno podanega ukaza za merjenje, vra\u010dajo prej\u0161njo vrednost, ne pa 50 05 (85.0 stopinj).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \n\u017dal nimam osciloskopa, testna postaja pa je bil GPS sledilnik Galileosky BaseBlock Lite. <\/p>\n

    Senzorji so bili kupljeni pri razli\u010dnih prodajalcih, in samo ena serija je delovala v na\u010dinu parazitske napajanja. Kupljenih je bilo skupno 5 serij po 50 kosov.
    \nOstale niso delovale v na\u010dinu parazitske napajanja sploh. Terminal ne predvideva zunanjega napajanja za senzor, namestitev sistema v avtomobil pa je potrebno maksimalno poenostaviti.<\/p>\n

    Re\u0161itev problema<\/h2>\n

    \nTorej, senzorji so kupljeni, vendar je le ena serija delovala pravilno, medtem ko bi razjasnitev te\u017eave in naro\u010danje nove serije vzelo precej \u010dasa in povzro\u010dilo dodatne stro\u0161ke. Zato sem te\u017eavo moral re\u0161iti sam.<\/p>\n

    Ker se uporablja samo dvo\u017ei\u010dna shema, je potrebno organizirati napajanje senzorja iz signalne \u017eice, torej izvesti parazitsko napajanje. Izvedel sem parazitsko napajanje po naslednji shemi:<\/p>\n

    \"Sensores
    \n
    \nV tem na\u010drtu je izbolj\u0161ano delovanje parazitske napetosti, hkrati pa je omogo\u010deno tudi priklju\u010ditev zunanjega napajanja. Pri tem se nekoliko spremeni shema povezovanja: pri povezovanju preko parazitskega napajanja se uporablja \u017eica Vcc. nepou\u017e\u00edva sa<\/u>.<\/p>\n

    Po sestavi sheme z navojnim priklopom je senzor bil zaznan s terminalom pri kapaciteti kondenzatorja 1 \u00b5F. Za mno\u017ei\u010dno uvedbo so bile na\u010drtovane in naro\u010dene o\u017ei\u010dene plo\u0161\u010de s parazitskim napajanjem:<\/p>\n

    \"Sensores
    \n
    \nZanimiv trenutek:<\/b> za hermetizacijo senzorja lahko proizvajalci uporabijo termalno lepilo ali silikon. V prvem primeru lahko segrejete tuljavo, izvle\u010dete senzor, vstavite plo\u0161\u010do, vrnete v tuljavo in ponovno napolnite s termalnim lepilom. Pri drugem to ne bo \u0161lo, zato je bilo treba plo\u0161\u010do pri\u017egati blizu senzorja, napolniti s termalnim lepilom in namestiti toplotno skr\u010denje, tako da ima tak\u0161en videz:<\/p>\n

    \"Sensores
    \n<\/p>\n

    Zaklju\u010dek<\/h2>\n

    \nTukaj bi rad pozval proizvajalce naprav, naj upo\u0161tevajo to to\u010dko v svojih izdelkih, prodajalce pa, naj preverjajo senzorske naprave pred prodajo ali se sploh ne ukvarjajo s ponudniki, ki dobavljajo ponarejene senzorje, uporabnike pa, naj to temo osvetlijo v komentarjih, pismih ali prito\u017ebah.
    \n
    Izvor:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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