{"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\/sv\/blog\/news\/poddelnye-ds18b20-waterproof-chto-delat","title":{"rendered":"Falska DS18B20-vattentemperaturgivare: vad ska man g\u00f6ra?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

God dag! I denna artikel diskuteras problemet med falska sensorer, begr\u00e4nsningarna i de befintliga enheterna som anv\u00e4nder dessa sensorer och l\u00f6sningen p\u00e5 detta problem.<\/p>\n

\"Falska
\nK\u00e4lla: ali-trends.ru<\/i><\/p>\n

Det har ocks\u00e5 skrivits om falska sensorer innan mig h\u00e4r<\/a><\/noindex>. K\u00e4nnetecknande skillnader mellan falska sensorer och originalet:<\/p>\n

    \n
  1. Sensorn, \u00e4ven n\u00e4r den \u00e4r ansluten n\u00e4ra, svarar os\u00e4kert n\u00e4r den arbetar i parasitstr\u00f6m l\u00e4ge.<\/li>\n
  2. I parasitstr\u00f6m l\u00e4ge \u00e5terst\u00e4lls den h\u00f6ga niv\u00e5n f\u00f6r l\u00e4nge (kan m\u00e4tas med en mikrokontroller eller se oscilloskopet)<\/li>\n
  3. str\u00f6mf\u00f6rbrukningen \u00e4r betydligt h\u00f6gre \u00e4n n\u00e5gra mikroamper (GND och VCC p\u00e5 minus, DQ genom en mikroampermeter till +5 volt)<\/li>\n
  4. Efter proceduren med uppr\u00e4kning (0xF0) svarar sensorerna inte p\u00e5 l\u00e4skommandot fr\u00e5n scratchpad (0xBE)<\/li>\n
  5. Temperaturen som l\u00e4ses fr\u00e5n scratchpad efter att str\u00f6mmen har slagits p\u00e5 utan m\u00e4tkommando skiljer sig fr\u00e5n 85,0 grader.<\/li>\n
  6. V\u00e4rdena i scratchpad p\u00e5 positionerna 5 och 7 \u00f6verensst\u00e4mmer inte med 0xFF och 0x10<\/li>\n
  7. Temperaturv\u00e4rdena (p\u00e5 de f\u00f6rsta tv\u00e5 positionerna i scratchpad) som l\u00e4ses efter den f\u00f6rsta uppkopplingen av en str\u00f6ml\u00f6s sensor utan ett tidigare givet m\u00e4tkommando returnerar det f\u00f6reg\u00e5ende v\u00e4rdet, ist\u00e4llet f\u00f6r 50 05 (85.0 grader).<\/li>\n<\/ol>\n

    \n<\/a><\/noindex>
    \nTyv\u00e4rr har jag ingen oscilloskop, och GPS-sp\u00e5raren Galileosky BaseBlock Lite fungerade som teststand. <\/p>\n

    Sensorerna k\u00f6ptes fr\u00e5n olika s\u00e4ljare, och endast ett parti fungerade med parasitstr\u00f6m. Totalt ink\u00f6ptes 5 partier om 50 enheter.
    \nDe andra fungerade inte med parasitstr\u00f6m alls. Terminalen f\u00f6ruts\u00e4tter ingen extern str\u00f6mf\u00f6rs\u00f6rjning f\u00f6r sensorn, och installationen av systemet i bilen m\u00e5ste g\u00f6ras s\u00e5 enkel som m\u00f6jligt.<\/p>\n

    L\u00f6s problemet<\/h2>\n

    \nS\u00e5 sensorerna \u00e4r k\u00f6pta, men endast ett parti fungerade korrekt, och att utreda detta och best\u00e4lla ett nytt parti skulle ta betydande tid och inneb\u00e4ra \u00f6verskridande av kostnaderna. D\u00e4rf\u00f6r var jag tvungen att l\u00f6sa problemet p\u00e5 egen hand.<\/p>\n

    Eftersom endast en tv\u00e5ledarschema anv\u00e4nds, \u00e4r det n\u00f6dv\u00e4ndigt att organisera str\u00f6mf\u00f6rs\u00f6rjningen till sensorn fr\u00e5n signalkabeln, det vill s\u00e4ga att ordna parasitstr\u00f6m. Jag ordnade parasitstr\u00f6m enligt f\u00f6ljande schema:<\/p>\n

    \"Falska
    \n
    \nI denna krets har den parasitiska str\u00f6mf\u00f6rs\u00f6rjningen f\u00f6rb\u00e4ttrats, men samtidigt finns det fortfarande m\u00f6jlighet att koppla in extern str\u00f6mf\u00f6rs\u00f6rjning. Anslutningsschemat \u00e4ndras n\u00e5got: vid anslutning via parasitisk str\u00f6mf\u00f6rs\u00f6rjning kopplas Vcc-kabeln. anv\u00e4nds inte<\/u>.<\/p>\n

    Efter att ha monterat kretsen med ytmontering uppt\u00e4cktes sensorn av terminalen vid kondensatorns kapacitans p\u00e5 1 \u03bcF. F\u00f6r massproduktion designades och best\u00e4lldes panelmonterade kort med parasitisk str\u00f6mf\u00f6rs\u00f6rjning.<\/p>\n

    \"Falska
    \n
    \nIntressant punkt:<\/b> F\u00f6r att s\u00e4kerst\u00e4lla t\u00e4tning av sensorn kan tillverkare anv\u00e4nda termokola eller silikon. I det f\u00f6rsta fallet kan man v\u00e4rma hylsan, ta ut sensorn, integrera kortet, s\u00e4tta tillbaka det i hylsan och fylla p\u00e5 med termokola. I det andra fallet g\u00e5r det inte s\u00e5 enkelt, och man var tvungen att l\u00f6da kortet n\u00e4ra sensorn, fylla p\u00e5 med termokola och s\u00e4tta p\u00e5 krympslang, vilket resulterar i att det ser ut s\u00e5 h\u00e4r:<\/p>\n

    \"Falska
    \n<\/p>\n

    Slutsats<\/h2>\n

    \nH\u00e4r vill jag uppmana tillverkare av enheter att ta h\u00e4nsyn till detta i sina produkter, och s\u00e4ljare att kontrollera sensorer innan f\u00f6rs\u00e4ljning eller helt undvika att samarbeta med leverant\u00f6rer som s\u00e4ljer f\u00f6rfalskade sensorer, samt anv\u00e4ndare att belysa detta \u00e4mne i kommentarer, brev eller anm\u00e4lningar.
    \n
    K\u00e4lla:     habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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