{"id":128,"date":"2021-06-30T13:24:12","date_gmt":"2021-06-30T13:24:12","guid":{"rendered":"http:\/\/nk-energi.dk\/?page_id=128"},"modified":"2021-08-03T16:53:02","modified_gmt":"2021-08-03T16:53:02","slug":"arduino-som-slave","status":"publish","type":"page","link":"http:\/\/nk-energi.dk\/?page_id=128","title":{"rendered":"PUD-teori og Arduino som slave"},"content":{"rendered":"<p><strong>PUD<\/strong><\/p>\n<p>N\u00e5r man skal bruge et input er man n\u00f8d til at montere en modstand, ellers vil input pinden m\u00e5le st\u00f8j. Der er to m\u00e5der man kan forbinde modstanden p\u00e5:<\/p>\n<ul>\n<li>Den f\u00f8rste er en pull down modstand i denne metode vil man kunne m\u00e5le 0V n\u00e5r kontakten er \u00e5ben. N\u00e5r der bliver trykket p\u00e5 kontakten vil den vise maksimum sp\u00e6nding. Denne metode er god hvis man skal m\u00e5le analoge signaler.<\/li>\n<li>Den anden metode er at man monterer en pull up modstand. Med denne type forbindelse vil man tr\u00e6kke sp\u00e6ndingen op til man n\u00e5r kontakten er \u00e5ben. N\u00e5r der trykkes p\u00e5 kontakten vil sp\u00e6ndingen blive br\u00e6ndt af i modstanden og man vil kunne m\u00e5le 0V p\u00e5 input pinden.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-594\" src=\"http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/PUD.png\" alt=\"\" width=\"678\" height=\"460\" srcset=\"http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/PUD.png 678w, http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/PUD-300x204.png 300w\" sizes=\"(max-width: 678px) 100vw, 678px\" \/><\/p>\n<p><strong>Beregnings eksempel Pull up modstsand<\/strong><\/p>\n<p>Det kan m\u00e5ske virke forvirrende at signalet falder til 0V n\u00e5r man trykker p\u00e5 knappen. Her under ses et beregning eksempel som viser hvorfor. Grunden er at den eksterne modstand (den ma selv monterer) er uendelig meget st\u00f8rre en den \u00e6kvivalent modstand, som opst\u00e5r n\u00e5r kontakten bliver trykket, dette medf\u00f8rer at alt sp\u00e6ndingen bliver br\u00e6ndt af, i den eksterne modstand og man vil derfor kunne m\u00e5le 0V n\u00e5r knappen er trykket.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-596\" src=\"http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks.png\" alt=\"\" width=\"1640\" height=\"697\" srcset=\"http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks.png 1640w, http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks-300x128.png 300w, http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks-1024x435.png 1024w, http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks-768x326.png 768w, http:\/\/nk-energi.dk\/wp-content\/uploads\/2021\/08\/Pullup_eks-1536x653.png 1536w\" sizes=\"(max-width: 1640px) 100vw, 1640px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>PUD N\u00e5r man skal bruge et input er man n\u00f8d til at montere en modstand, ellers vil input pinden m\u00e5le st\u00f8j. Der er to m\u00e5der man kan forbinde modstanden p\u00e5: Den f\u00f8rste er en pull down modstand i denne metode &hellip; <a href=\"http:\/\/nk-energi.dk\/?page_id=128\">L\u00e6s resten <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"onecolumn-page.php","meta":[],"_links":{"self":[{"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/pages\/128"}],"collection":[{"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/nk-energi.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=128"}],"version-history":[{"count":8,"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/pages\/128\/revisions"}],"predecessor-version":[{"id":602,"href":"http:\/\/nk-energi.dk\/index.php?rest_route=\/wp\/v2\/pages\/128\/revisions\/602"}],"wp:attachment":[{"href":"http:\/\/nk-energi.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}