{"id":85,"date":"2013-02-22T21:18:58","date_gmt":"2013-02-23T05:18:58","guid":{"rendered":"http:\/\/schminktronics.com\/blog\/?p=85"},"modified":"2013-02-23T11:25:36","modified_gmt":"2013-02-23T19:25:36","slug":"power-problems","status":"publish","type":"post","link":"http:\/\/schminktronics.com\/blog\/archives\/85","title":{"rendered":"Power problems"},"content":{"rendered":"<div>Though everything looked good, when I switched to battery power, it stopped working. The test program I&#8217;m using lights one LED at a time, switching every 100 ms. So, I can tell that the board runs for between 100ms and 1 second before it just dies. This is similar but much worse than my very first design using batteries that couldn&#8217;t supply enough current. However, I&#8217;ve used this design with AAA batteries before. I&#8217;ve looked at the AAA datasheets and they should be\u00a0<strong>well<\/strong> within spec for this.<\/div>\n<div><\/div>\n<div>But maybe the LED driver is pulling way more current than I thought and dropping the voltage to trip the brownout? I checked with my new bench power supply and I see I can run it down to 2.7 V, so that&#8217;s not a problem. At that voltage, it&#8217;s only drawing 7 mA of current, so I <strong>can&#8217;t<\/strong>\u00a0be pulling too much from the batteries.<\/div>\n<div><\/div>\n<div>Just to be sure, I hooked up a scope and see things like this:<\/div>\n<div><a href=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/02\/SpinnerHDpower2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-86\" alt=\"SpinnerHD power problem\" src=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/02\/SpinnerHDpower2.png\" width=\"800\" height=\"600\" srcset=\"http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/02\/SpinnerHDpower2.png 800w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/02\/SpinnerHDpower2-300x225.png 300w, http:\/\/schminktronics.com\/blog\/wp-content\/uploads\/2013\/02\/SpinnerHDpower2-400x300.png 400w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/div>\n<div><\/div>\n<div>Sure enough&#8211;after around 200 ms, the power just drops! It wiggles around for a few hundred ms. What can be causing this? There&#8217;s no problem with a real power supply&#8230; Is it something funky due to the modifications I had to make with the dremel? What is going on?<\/div>\n<div><\/div>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Though everything looked good, when I switched to battery power, it stopped working. The test program I&#8217;m using lights one LED at a time, switching every 100 ms. So, I can tell that the board runs for between 100ms and &hellip; <a href=\"http:\/\/schminktronics.com\/blog\/archives\/85\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-85","post","type-post","status-publish","format-standard","hentry","category-spinnerhd"],"_links":{"self":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/85","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/comments?post=85"}],"version-history":[{"count":1,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/85\/revisions"}],"predecessor-version":[{"id":87,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/posts\/85\/revisions\/87"}],"wp:attachment":[{"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/media?parent=85"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/categories?post=85"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/schminktronics.com\/blog\/wp-json\/wp\/v2\/tags?post=85"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}