{"id":1482,"date":"2012-02-24T13:50:36","date_gmt":"2012-02-24T13:50:36","guid":{"rendered":"http:\/\/clydelettsome.com\/blog\/?p=1482"},"modified":"2019-06-04T17:53:15","modified_gmt":"2019-06-04T17:53:15","slug":"changing-a-light-source","status":"publish","type":"post","link":"https:\/\/clydelettsome.com\/blog\/2012\/02\/24\/changing-a-light-source\/","title":{"rendered":"Changing A Light Source"},"content":{"rendered":"<table border=\"0\">\n<tbody>\n<tr>\n<td><a href=\"https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2011\/07\/Silhouette.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-thumbnail wp-image-764\" title=\"Silhouette\" src=\"https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2011\/07\/Silhouette-140x150.jpg\" alt=\"\" width=\"70\" height=\"75\" \/><\/a><\/td>\n<td><strong>thitchen007:<\/strong><br \/>\nDr. Lettsome,<\/p>\n<p>Thank you so much for your video. I learnt a lot form it.<\/p>\n<p>Do you think a light from a red LED can activate your switch in your video &#8220;<a href=\"https:\/\/www.youtube.com\/watch?v=-rPBeJPwVKo&amp;context=C3e2ddcaADOEgsToPDskIIBC1g1r9WKqELtcqbvGIt\">Light Sensitive Switch<\/a>&#8220;?<\/p>\n<p>Or what kind of photo-diode do you think can do that job, i.e. activate a switch by a light emitted by a single small red LED?<\/p>\n<p>Many thanks!<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2010\/11\/bw_headshot.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-116\" title=\"bw_headshot\" src=\"https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2010\/11\/bw_headshot.jpg\" alt=\"Clyde A. Lettsome, PhD, PE, MEM\" width=\"70\" height=\"70\" srcset=\"https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2010\/11\/bw_headshot.jpg 80w, https:\/\/clydelettsome.com\/blog\/wp-content\/uploads\/2010\/11\/bw_headshot-60x60.jpg 60w\" sizes=\"auto, (max-width: 70px) 100vw, 70px\" \/><\/a><\/td>\n<td><strong>Answer:<\/strong> The circuit will work with a red LED placed within a reasonable proximity of the photo-diode. You may need to adjust the potentiometer in the circuit to drop the reference (threshold) voltage. By doing so, the circuit becomes more sensitive to light.<\/p>\n<p>Good Luck!<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Are you a struggling with a technical question? Would the answer to the question improve your life or business? <a href=\"https:\/\/clydelettsome.com\/blog\/forms?page=ask-the-frugal-techie\">Submit your technical questions<\/a>.<\/p>\n<p><a href=\"https:\/\/clydelettsome.com\/blog\/category\/ask-the-expert\/\">View Archives &gt;&gt;<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>thitchen007: Dr. Lettsome, Thank you so much for your video. I learnt a lot form it. Do you think a light from a red LED can activate your switch in your video &#8220;Light Sensitive Switch&#8220;? Or what kind of photo-diode do you think can do that job, i.e. activate a switch by a light emitted &hellip; <\/p>\n<div class=\"more-link-wrapper\"><a href=\"https:\/\/clydelettsome.com\/blog\/2012\/02\/24\/changing-a-light-source\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Changing A Light Source&#8221;<\/span><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[306,36,307],"class_list":{"0":"post-1482","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ask-the-expert","7":"tag-led","8":"tag-light-sensitive-switch","9":"tag-photo-diode","10":"h-entry","11":"hentry"},"_links":{"self":[{"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/posts\/1482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/comments?post=1482"}],"version-history":[{"count":10,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/posts\/1482\/revisions"}],"predecessor-version":[{"id":5341,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/posts\/1482\/revisions\/5341"}],"wp:attachment":[{"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/media?parent=1482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/categories?post=1482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clydelettsome.com\/blog\/wp-json\/wp\/v2\/tags?post=1482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}