{"id":3032,"date":"2012-06-06T07:38:58","date_gmt":"2012-06-06T14:38:58","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=3032"},"modified":"2012-06-08T02:50:26","modified_gmt":"2012-06-08T09:50:26","slug":"2012-06-06-joule-thief-brightness-controlled-by-photocell","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=3032","title":{"rendered":"2012-06-06 Joule Thief Brightness Controlled by Photocell"},"content":{"rendered":"<p>This <a href=\"http:\/\/www.youtube.com\/watch?v=YOkRF4CDodc\"><strong>Youtube video<\/strong><\/a> shows a guy&#8217;s Joule Thief that has its brightness controlled by a CdS photocell.\u00a0 The ambient light changes the photocell&#8217;s resistance, which adjusts the JT&#8217;s brightness.\u00a0 I haven&#8217;t yet seen the schematic but he promised another video with more will be posted soon.<\/p>\n<p>I left a comment with a link to my blog that shows hot to use a LED as a sensor.\u00a0 Someone mentioned that there was a device that used a microcontroller to drive an array of LEDs, and during the time the LEDs were off, the microcontroller changed to sensing the current from the LEDs caused by ambient light.\u00a0 That&#8217;s pretty cool, because you could use them to make an interactive display that senses shadows from your hand, for instance, and changes the LEDs accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This Youtube video shows a guy&#8217;s Joule Thief that has its brightness controlled by a CdS photocell.\u00a0 The ambient light changes the photocell&#8217;s resistance, which adjusts the JT&#8217;s brightness.\u00a0 I haven&#8217;t yet seen the schematic but he promised another video with more will be posted soon. I left a comment with a link to my<a href=\"https:\/\/rustybolt.info\/wordpress\/?p=3032\"> <\/p>\n<p> (Read More&#8230;)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,13],"tags":[],"class_list":["post-3032","post","type-post","status-publish","format-standard","hentry","category-joule-thief-smps-dc-dc","category-lighting"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3032","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3032"}],"version-history":[{"count":4,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3032\/revisions"}],"predecessor-version":[{"id":3092,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3032\/revisions\/3092"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}