{"id":119,"date":"2014-02-10T16:50:41","date_gmt":"2014-02-10T16:50:41","guid":{"rendered":"https:\/\/ca.rstenpresser.de\/blag\/?p=119"},"modified":"2014-02-10T16:55:03","modified_gmt":"2014-02-10T16:55:03","slug":"replace-the-battery-of-a-digital-caliper-with-a-supercap","status":"publish","type":"post","link":"https:\/\/ca.rstenpresser.de\/blag\/2014\/02\/replace-the-battery-of-a-digital-caliper-with-a-supercap\/","title":{"rendered":"Replace the battery of a Digital caliper with a supercap"},"content":{"rendered":"<p>I got the calipers off ebay (&lt;10$) quite a while ago, but they kept draining the battery really fast. After i discovered <a href=\"http:\/\/www.trevorshp.com\/creations\/calipers.htm\" target=\"_blank\">this blogpost<\/a> I decided to modify my calipers in a similar way.<\/p>\n<p><a href=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2153.small_.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-120\" alt=\"Modified caliper with charging cable\" src=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2153.small_-1024x661.jpg\" width=\"450\" height=\"290\" srcset=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2153.small_-1024x661.jpg 1024w, https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2153.small_-300x193.jpg 300w, https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2153.small_.jpg 1600w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>The basic idea is the same:<\/p>\n<ul>\n<li>replace the battery with a supercap<\/li>\n<li>build a charging device<\/li>\n<\/ul>\n<p>The only real difference compared to<a href=\"http:\/\/www.trevorshp.com\/creations\/calipers.htm\" target=\"_blank\"> trevors project<\/a> is the voltage used. I didnt have a 1.8V LDO around, so i decided to go with 3.3V.\u00c2\u00a0 An additional SI-Diode in the charging-path drops 0.7Volt, so the actual voltage for a charged cap is 2.6V which seems to be fine for the caliper (i did no long-time test yet). Also, with that diode one cant blow the cap by charging with reverse polarity.<\/p>\n<p>I only used parts you can get from the german distributor Reichelt. The cap is a &#8220;SPK 1.0F&#8221;, the switch is called &#8216;T215&#8243;.<\/p>\n\n\t\t<div id='gallery-1' class='gallery galleryid-119 gallery-columns-3 gallery-size-thumbnail gallery1'><script type=\"text\/javascript\">\r\n\/\/ <![CDATA[\r\n\tjQuery(document).ready(function () {\r\n\t\tjQuery(\".gallery1 a\").attr(\"rel\",\"gallery1\");\t\r\n\t\tjQuery('a[rel=\"gallery1\"]').colorbox({maxWidth:\"95%\", maxHeight:\"95%\",title: function(){ return jQuery(this).children().attr(\"alt\"); }, });\r\n\t});\r\n\/\/ ]]>\r\n<\/script>\n<figure class=\"gallery-item\">\n<div class=\"gallery-icon\">\r\n<a href=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2147.small_.jpg\" title=\"Parts used\" rel=\"gallery1\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2147.small_-150x150.jpg\" width=\"150\" height=\"150\" alt=\"Parts used\" \/><\/a>\r\n<\/div><figcaption class=\"gallery-caption\" id=\"caption121\"><span class=\"imagecaption\">Parts used<\/span><br \/>\n<\/figcaption><\/figure><figure class=\"gallery-item\">\n<div class=\"gallery-icon\">\r\n<a href=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2148.small_.jpg\" title=\"remove plastics to make space for the switch\" rel=\"gallery1\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2148.small_-150x150.jpg\" width=\"150\" height=\"150\" alt=\"remove plastics to make space for the switch\" \/><\/a>\r\n<\/div><figcaption class=\"gallery-caption\" id=\"caption122\"><span class=\"imagecaption\">remove plastics to make space for the switch<\/span><br \/>\n<\/figcaption><\/figure><figure class=\"gallery-item\">\n<div class=\"gallery-icon\">\r\n<a href=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2149.small_.jpg\" title=\"pre-assembled cap\" rel=\"gallery1\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/ca.rstenpresser.de\/wp-files\/2014\/02\/IMG_2149.small_-150x150.jpg\" width=\"150\" height=\"150\" alt=\"pre-assembled cap\" \/><\/a>\r\n<\/div><figcaption class=\"gallery-caption\" id=\"caption123\"><span class=\"imagecaption\">pre-assembled cap<\/span><br \/>\n<\/figcaption><\/figure>\r\n\t\t<\/div>\n\n<p>I did not much testing yet. But the cap kept enough power to work with the caliper even after 80 hours &#8216;standby&#8217; \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I got the calipers off ebay (&lt;10$) quite a while ago, but they kept draining the battery really fast. After i discovered this blogpost I decided to modify my calipers in a similar way. The basic idea is the same: replace the battery with a supercap build a charging device The only real difference compared &hellip; <a href=\"https:\/\/ca.rstenpresser.de\/blag\/2014\/02\/replace-the-battery-of-a-digital-caliper-with-a-supercap\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Replace the battery of a Digital caliper with a supercap<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[50,51,54,55,43,53,52],"_links":{"self":[{"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/posts\/119"}],"collection":[{"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/comments?post=119"}],"version-history":[{"count":5,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/posts\/119\/revisions"}],"predecessor-version":[{"id":129,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/posts\/119\/revisions\/129"}],"wp:attachment":[{"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/media?parent=119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/categories?post=119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ca.rstenpresser.de\/blag\/wp-json\/wp\/v2\/tags?post=119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}