{"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\/cs\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"Podvodn\u00ed DS18B20: co d\u011blat?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dobr\u00fd den! Tento \u010dl\u00e1nek se zam\u011b\u0159uje na probl\u00e9m pad\u011blan\u00fdch senzor\u016f, omezen\u00ed st\u00e1vaj\u00edc\u00edch za\u0159\u00edzen\u00ed, kter\u00e1 tyto senzory pou\u017e\u00edvaj\u00ed, a \u0159e\u0161en\u00ed tohoto probl\u00e9mu.<\/p>\n

\"Podvodn\u00ed
\nZdroj: ali-trends.ru<\/i><\/p>\n

O pad\u011blan\u00fdch senzorech u\u017e se psalo zde<\/a><\/noindex>. Hlavn\u00ed rozd\u00edly mezi pad\u011blan\u00fdmi senzory a origin\u00e1ly:<\/p>\n

    \n
  1. Senzor, i kdy\u017e je p\u0159ipojen bl\u00edzko, reaguje v re\u017eimu parazitn\u00edho nap\u00e1jen\u00ed nejist\u011b, ka\u017edou druhou.<\/li>\n
  2. V re\u017eimu parazitn\u00edho nap\u00e1jen\u00ed se vysok\u00e1 \u00farove\u0148 obnovuje p\u0159\u00edli\u0161 pomalu (lze m\u011b\u0159it mikrokontrol\u00e9rem nebo sledovat oscilogram)<\/li>\n
  3. spot\u0159eba proudu je v\u00fdrazn\u011b vy\u0161\u0161\u00ed ne\u017e n\u011bkolik mikroamp\u00e9r (GND a VCC na minus, DQ p\u0159es mikroamp\u00e9rmetr na +5 volt\u016f)<\/li>\n
  4. Po procedu\u0159e \u010dten\u00ed (0xF0) senzory nereaguj\u00ed na p\u0159\u00edkaz pro \u010dten\u00ed skre\u010dpad (0xBE)<\/li>\n
  5. Teplota p\u0159e\u010dten\u00e1 ze skre\u010dpadu po zapnut\u00ed bez p\u0159\u00edkazu na m\u011b\u0159en\u00ed se li\u0161\u00ed od 85,0 stup\u0148\u016f.<\/li>\n
  6. Hodnoty ve skre\u010dpadu na pozic\u00edch 5 a 7 neodpov\u00eddaj\u00ed 0xFF a 0x10<\/li>\n
  7. Hodnoty teploty (na prvn\u00edch dvou pozic\u00edch skre\u010dpadu) p\u0159e\u010dten\u00e9 po prvn\u00edm zapnut\u00ed bez p\u0159edchoz\u00edho p\u0159\u00edkazu k m\u011b\u0159en\u00ed vracej\u00ed p\u0159edchoz\u00ed hodnotu, nikoli 50 05 (85,0 stup\u0148\u016f).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nBohu\u017eel, nem\u00e1m oscilloskop a jako testovac\u00ed st\u0159edisko slou\u017eil GPS tracker Galileosky BaseBlock Lite. <\/p>\n

    Senzory byly zakoupeny od r\u016fzn\u00fdch prodejc\u016f, a jen jedna \u0161ar\u017ee fungovala v re\u017eimu parazitn\u00edho nap\u00e1jen\u00ed. Zakoupilo se celkem 5 \u0161ar\u017e\u00ed po 50 kusech.
    \nOstatn\u00ed nefungovaly v re\u017eimu parazitn\u00edho nap\u00e1jen\u00ed v\u016fbec. Termin\u00e1l nep\u0159edpokl\u00e1d\u00e1 extern\u00ed nap\u00e1jen\u00ed pro senzor, a mont\u00e1\u017e syst\u00e9mu na automobil je t\u0159eba maxim\u00e1ln\u011b zjednodu\u0161it.<\/p>\n

    \u0158e\u0161en\u00ed probl\u00e9mu<\/h2>\n

    \nTak\u017ee, senzory byly zakoupeny, ale jen jedna \u0161ar\u017ee fungovala spr\u00e1vn\u011b, a vy\u0159izov\u00e1n\u00ed a objedn\u00e1n\u00ed nov\u00e9 \u0161ar\u017ee by zabralo v\u00fdznamn\u00fd \u010das a vedlo by k nadm\u011brn\u00e9 spot\u0159eb\u011b. Proto bylo nutn\u00e9 probl\u00e9m vy\u0159e\u0161it vlastn\u00edmi silami.<\/p>\n

    Jeliko\u017e se pou\u017e\u00edv\u00e1 pouze dvoup\u00f3lov\u00e9 sch\u00e9ma, je nutn\u00e9 zajistit nap\u00e1jen\u00ed senzoru ze sign\u00e1ln\u00edho vodi\u010de, tedy zorganizovat parazitn\u00ed nap\u00e1jen\u00ed. Parazitn\u00ed nap\u00e1jen\u00ed jsem zorganizoval podle n\u00e1sleduj\u00edc\u00ed sch\u00e9matu:<\/p>\n

    \"Podvodn\u00ed
    \n
    \nV tomto sch\u00e9matu byla zdokonalena \u010dinnost parazitn\u00edho nap\u00e1jen\u00ed, zat\u00edmco byla zachov\u00e1na mo\u017enost p\u0159ipojen\u00ed extern\u00edho nap\u00e1jen\u00ed. P\u0159i tom se m\u00edrn\u011b m\u011bn\u00ed sch\u00e9ma p\u0159ipojen\u00ed: p\u0159i p\u0159ipojen\u00ed pomoc\u00ed parazitn\u00edho nap\u00e1jen\u00ed se vodi\u010d Vcc nepou\u017e\u00edv\u00e1<\/u>.<\/p>\n

    Po sestaven\u00ed sch\u00e9matu nekontrolovan\u011b senzor detekoval termin\u00e1l p\u0159i kapacit\u011b kondenz\u00e1toru 1 \u03bcF. Pro masov\u00e9 nasazen\u00ed byly navr\u017eeny a objedn\u00e1ny panelov\u00e9 desky s deskami parazitn\u00edho nap\u00e1jen\u00ed:<\/p>\n

    \"Podvodn\u00ed
    \n
    \nZaj\u00edmav\u00fd moment:<\/b> pro ut\u011bsn\u011bn\u00ed senzoru mohou v\u00fdrobci pou\u017e\u00edt termolepidlo nebo silikon. V prvn\u00edm p\u0159\u00edpad\u011b lze oh\u0159\u00e1t pouzdro, vyjmout senzor, vlo\u017eit desku, vr\u00e1tit do pouzdra a znovu zal\u00edt termolepidlem. Ve druh\u00e9m p\u0159\u00edpad\u011b to ji\u017e nen\u00ed mo\u017en\u00e9 a bylo nutn\u00e9 p\u0159ipojit desku bl\u00edzko senzoru, zal\u00edt termolepidlem a nasadit tepeln\u011b smr\u0161titelnou f\u00f3lii, v d\u016fsledku \u010deho\u017e m\u00e1 takov\u00fd vzhled:<\/p>\n

    \"Podvodn\u00ed
    \n<\/p>\n

    Z\u00e1v\u011br<\/h2>\n

    \nR\u00e1d bych vyzval v\u00fdrobce za\u0159\u00edzen\u00ed, aby vzali tento moment v \u00favahu ve sv\u00fdch produktech, prodejce, aby kontrolovali senzory p\u0159ed prodejem, nebo se s dodavatelem v\u016fbec nezapletli, pokud dod\u00e1v\u00e1 pad\u011blan\u00e9 senzory, a u\u017eivatele, aby toto t\u00e9ma osv\u011btluj\u00ed v koment\u00e1\u0159\u00edch, dopisech nebo st\u00ed\u017enostech.
    \n
    Zdroj:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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