{"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\/ro\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"DS18B20 waterproof false: ce s\u0103 faci?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Bun\u0103 ziua! Acest articol abordeaz\u0103 problema senzori falsifica\u021bi, limit\u0103rile dispozitivelor existente care folosesc ace\u0219ti senzori \u0219i solu\u021bia acestei probleme.<\/p>\n

\"DS18B20
\nSursa: ali-trends.ro<\/i><\/p>\n

Despre senzori falsifica\u021bi s-a scris \u0219i anterior aici<\/a><\/noindex>. Diferen\u021bele caracteristice \u00eentre senzorii falsifica\u021bi \u0219i cei originali sunt:<\/p>\n

    \n
  1. Senzorul, chiar dac\u0103 este conectat \u00een apropiere, \u00een modul de alimentare parazitar\u0103 r\u0103spunde nesigur, din dou\u0103 \u00een dou\u0103.<\/li>\n
  2. \u00cen modul de alimentare parazitar\u0103 nivelul \u00eenalt se restabile\u0219te prea lent (poate fi m\u0103surat cu un microcontroler sau observat pe un osciloscop)<\/li>\n
  3. consumul de curent este semnificativ mai mare dec\u00e2t c\u00e2\u021biva microamperi (GND \u0219i VCC pe minus, DQ printr-un microampermetru pe +5 vol\u021bi)<\/li>\n
  4. Dup\u0103 procedura de enumerare (0xF0) senzorii nu r\u0103spund la comanda de citire a scratchpad-ului (0xBE)<\/li>\n
  5. Temperatura citit\u0103 din scratchpad dup\u0103 alimentarea f\u0103r\u0103 comanda de m\u0103surare este diferit\u0103 de 85,0 grade.<\/li>\n
  6. Valorile din scratchpad pe pozi\u021biile 5 \u0219i 7 nu corespund 0xFF \u0219i 0x10<\/li>\n
  7. Valorile temperaturii (pe primele dou\u0103 pozi\u021bii ale scratchpad-ului) citite dup\u0103 prima activare a senzorului f\u0103r\u0103 alimentare, f\u0103r\u0103 comanda prealabil\u0103 de m\u0103surare, returneaz\u0103 valoarea anterioar\u0103, nu 50 05 (85.0 grade).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nDin p\u0103cate, nu am un osciloscop, iar ca banc de testare am folosit un GPS tracker Galileosky BaseBlock Lite. <\/p>\n

    Senzorii au fost achizi\u021biona\u021bi de la diferi\u021bi furnizori, iar doar un lot a func\u021bionat prin alimentare parazitar\u0103. Au fost achizi\u021bionate \u00een total 5 loturi de c\u00e2te 50 de buc\u0103\u021bi.
    \nCelelalte nu au func\u021bionat deloc prin alimentare parazitar\u0103. Terminalul nu prevede alimentare extern\u0103 pentru senzor, iar instalarea sistemului \u00een automobil trebuie simplificat\u0103 la maximum.<\/p>\n

    Rezolvarea problemei<\/h2>\n

    \nA\u0219adar, senzorii au fost achizi\u021biona\u021bi, dar doar un lot a func\u021bionat corect, iar analizarea problemelor \u0219i comandarea unui nou lot ar fi durat mult timp \u0219i ar fi dus la cheltuieli suplimentare. Prin urmare, a trebuit s\u0103 rezolv problema de unul singur.<\/p>\n

    \u00centruc\u00e2t se utilizeaz\u0103 doar schema cu dou\u0103 fire, este necesar\u0103 organizarea aliment\u0103rii senzorului din firul de semnal, adic\u0103, organizarea aliment\u0103rii parazitare. Am organizat alimentarea parazitar\u0103 dup\u0103 urm\u0103toarea schem\u0103:<\/p>\n

    \"DS18B20
    \n
    \n\u00cen acest schematic, func\u021bionarea aliment\u0103rii parazitare a fost \u00eembun\u0103t\u0103\u021bit\u0103, dar, \u00een acela\u0219i timp, r\u0103m\u00e2ne posibilitatea de a conecta o alimentare extern\u0103. \u00cen acest sens, schema de conectare se schimb\u0103 pu\u021bin: la conectarea prin alimentare parazitar\u0103, firul Vcc nu este utilizat<\/u>.<\/p>\n

    Dup\u0103 asamblarea schemei prin montaj suspendat, senzorul a fost detectat de terminal cu o capacitate a condensatorului de 1 \u00b5F. Pentru implementarea \u00een mas\u0103, au fost proiectate \u0219i comandate pl\u0103ci panou cu pl\u0103ci de alimentare parazitar\u0103:<\/p>\n

    \"DS18B20
    \n
    \nUn aspect interesant:<\/b> pentru etan\u0219area senzorului, produc\u0103torii pot folosi lipici termic sau silicon. \u00cen primul caz, se poate \u00eenc\u0103lzi hus\u0103, se scoate senzorul, se integreaz\u0103 placa, se returneaz\u0103 \u00een hus\u0103 \u0219i se toarn\u0103 \u00eenc\u0103 lipici termic. \u00cen al doilea caz, nu este posibil s\u0103 proced\u0103m astfel, a\u0219a c\u0103 a fost necesar\u0103 lipirea pl\u0103cii \u00een apropierea senzorului, turnarea lipiciului termic \u0219i montarea de retractabil, rezultatul fiind de aceast\u0103 form\u0103:<\/p>\n

    \"DS18B20
    \n<\/p>\n

    Concluzie<\/h2>\n

    \nAici a\u0219 dori s\u0103 invit produc\u0103torii de dispozitive s\u0103 ia \u00een considerare acest aspect \u00een produsele lor, iar v\u00e2nz\u0103torii s\u0103 verifice senzorii \u00eenainte de v\u00e2nzare sau s\u0103 nu aib\u0103 de-a face deloc cu furnizorul dac\u0103 acesta furnizeaz\u0103 senzori contraf\u0103cu\u021bi, iar utilizatorii s\u0103 abordeze aceast\u0103 tem\u0103 \u00een comentarii, scrisori sau solicit\u0103ri.
    \n
    Sursa:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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