{"id":1221,"date":"2019-10-12T00:07:44","date_gmt":"2019-10-12T04:07:44","guid":{"rendered":"http:\/\/www.briancbecker.com\/blog\/?p=1221"},"modified":"2020-04-12T19:45:31","modified_gmt":"2020-04-12T23:45:31","slug":"2019-10-11-digital-thermostat-w-external-probe","status":"publish","type":"post","link":"http:\/\/www.briancbecker.com\/blog\/2019\/2019-10-11-digital-thermostat-w-external-probe\/","title":{"rendered":"2019.10.11: Digital Thermostat w\/ External Probe"},"content":{"rendered":"\n<p>The past few days I&#8217;ve been seeing 10-15 degree swings with an analog house thermometer and a digital house thermometer hooked up to my gas Williams vented heater in my greenhouse. This seemed pretty large. Part of the problem seems to be the thermostats don&#8217;t adjust quickly to temperature changes, e.g. are too low-pass. Could I somehow hook up something that responded more quickly to temperature swings? <\/p>\n\n\n\n<p>So time to experiment! I did have a heat mat thermostat controller that turns a 120 V electrical plug on and off (designed to warm soil to a set temperature for germination). It has an external thermostat probe that seemed quite responsive. However, the gas furnace doesn&#8217;t turn on and off with 120 V, it&#8217;s instead a millivolt system that simply closes and opens a circuit to turn the furnace on and off. So I got an <a href=\"https:\/\/www.amazon.com\/gp\/product\/B017743I7S\/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&amp;psc=1\">AC\/DC power relay<\/a> that converted a 120V electrical socket turning and off to turning my furnace on and off. <\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"778\" height=\"259\" src=\"http:\/\/www.briancbecker.com\/blog\/wp-content\/uploads\/2019\/10\/image-1.png\" alt=\"\" class=\"wp-image-1222\" srcset=\"http:\/\/www.briancbecker.com\/blog\/wp-content\/uploads\/2019\/10\/image-1.png 778w, http:\/\/www.briancbecker.com\/blog\/wp-content\/uploads\/2019\/10\/image-1-300x100.png 300w, http:\/\/www.briancbecker.com\/blog\/wp-content\/uploads\/2019\/10\/image-1-768x256.png 768w\" sizes=\"auto, (max-width: 778px) 100vw, 778px\" \/><\/figure>\n\n\n\n<p>This seems to be working a lot better! Less than 5 degrees of temperature swing. This is a pretty simple thermostat so the next step is to try a programmable thermostat that has an external probe. Having it set a lower temperature at night automatically would be quite nice. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>The past few days I&#8217;ve been seeing 10-15 degree swings with an analog house thermometer and a digital house thermometer&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-1221","post","type-post","status-publish","format-standard","hentry","category-greenhouse"],"_links":{"self":[{"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/posts\/1221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/comments?post=1221"}],"version-history":[{"count":1,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/posts\/1221\/revisions"}],"predecessor-version":[{"id":1223,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/posts\/1221\/revisions\/1223"}],"wp:attachment":[{"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/media?parent=1221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/categories?post=1221"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.briancbecker.com\/blog\/wp-json\/wp\/v2\/tags?post=1221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}