{"id":2995,"date":"2015-10-09T12:28:23","date_gmt":"2015-10-09T12:28:23","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=2995"},"modified":"2015-10-09T12:28:23","modified_gmt":"2015-10-09T12:28:23","slug":"leds-as-light-sensors","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2015\/10\/leds-as-light-sensors\/","title":{"rendered":"LEDs as light sensors"},"content":{"rendered":"<p>Forrest Mims is somewhat famous for using <a href=\"http:\/\/makezine.com\/projects\/make-36-boards\/how-to-use-leds-to-detect-light\/\">LEDs as light sensors<\/a>. I wanted to try this myself:<\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/bLyQbLptKTA\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>It seems to work reasonably well with a transimpedance amplifier and a 100M feedback resistor. I was using the LED from a torch (as it was the only clear LED I had to hand). The response time was surprisingly slow. I kind of wonder if the torch LED module has a decoupling cap in it (and also a current limiting resistor) so I&#8217;ll try this experiment again when I have some proper LEDs&#8230; <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Forrest Mims is somewhat famous for using LEDs as light sensors. I wanted to try this myself: It seems to work reasonably well with a transimpedance amplifier and a 100M feedback resistor. I was using the LED from a torch (as it was the only clear LED I had to hand). The response time was [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-2995","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-Mj","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=2995"}],"version-history":[{"count":1,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2995\/revisions"}],"predecessor-version":[{"id":2996,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/2995\/revisions\/2996"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=2995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=2995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=2995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}