{"id":2561,"date":"2018-12-18T00:00:47","date_gmt":"2018-12-17T23:00:47","guid":{"rendered":"https:\/\/iot.fkainka.de\/?p=2561"},"modified":"2018-11-21T16:17:29","modified_gmt":"2018-11-21T15:17:29","slug":"day18-2018","status":"publish","type":"post","link":"https:\/\/iot.fkainka.de\/en\/day18-2018","title":{"rendered":"Day 18: Candle Alarm"},"content":{"rendered":"<p>And today we have a small diode waiting behind the door. We are going to use the diode as temperature sensor for particular high temperatures and with it we will build a small candle guard.<\/p>\n<div id=\"attachment_2562\" style=\"width: 376px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine.png\"><img aria-describedby=\"caption-attachment-2562\" decoding=\"async\" loading=\"lazy\" class=\" wp-image-2562\" src=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine-827x1024.png\" alt=\"Versuchsaufbau\" width=\"366\" height=\"453\" data-id=\"2562\" srcset=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine-827x1024.png 827w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine-242x300.png 242w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine-768x951.png 768w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/Day18_Diode_Steckplatine.png 879w\" sizes=\"(max-width: 366px) 100vw, 366px\" \/><\/a><p id=\"caption-attachment-2562\" class=\"wp-caption-text\">Breadboard Setup<\/p><\/div>\n<p>Today\u2019s setup consists of the diode and the potentiometer, which we will use as a 10-kOhm resistor. This resistance is fixed and cannot be adjusted. The board will measure the voltage at the diode and sends the values\u00a0 to Node-RED via MQTT.<\/p>\n<p><iframe style=\"border: none; width: 100%;\" src=\"https:\/\/pastebin.com\/embed_iframe\/guE6TX9F\"><\/iframe><\/p>\n<div id=\"attachment_2563\" style=\"width: 626px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow.png\"><img aria-describedby=\"caption-attachment-2563\" decoding=\"async\" loading=\"lazy\" class=\"size-large wp-image-2563\" src=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow-1024x169.png\" alt=\"Der Flow des Kerzenmelders\" width=\"616\" height=\"102\" data-id=\"2563\" srcset=\"https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow-1024x169.png 1024w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow-300x49.png 300w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow-768x127.png 768w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow-972x160.png 972w, https:\/\/iot.fkainka.de\/wp-content\/uploads\/2018\/11\/T18Flow.png 1092w\" sizes=\"(max-width: 616px) 100vw, 616px\" \/><\/a><p id=\"caption-attachment-2563\" class=\"wp-caption-text\">Flow of the candle guard<\/p><\/div>\n<p>Today\u2019s flow is continually evaluating the measured value. If the value falls below a certain value (the higher the temperature, the lower the measured voltage), an alarm is output in the form of a read-out text message and an info box. You can set a threshold for the alarm in the user interface. Place the diode near the lower part of a candle in such a way that the flame is near to the diode as it burns down and you have got a very handy detector for a candle that has burnt down to the bottom.<\/p>","protected":false},"excerpt":{"rendered":"<p>And today we have a small diode waiting behind the door. We are going to use the diode as temperature sensor for particular high temperatures and with it we will build a small candle guard. Today\u2019s setup consists of the&#8230;<br \/><a class=\"read-more-button\" href=\"https:\/\/iot.fkainka.de\/en\/day18-2018\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":2562,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[315,312,313],"tags":[],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Day 18: Candle Alarm - Internet of Things with the NanoESP<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/iot.fkainka.de\/day18-2018\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Day 18: Candle Alarm - Internet of Things with the NanoESP\" \/>\n<meta property=\"og:description\" content=\"And today we have a small diode waiting behind the door. 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