{"id":2182,"date":"2014-03-09T17:40:59","date_gmt":"2014-03-09T15:40:59","guid":{"rendered":"http:\/\/www.devrearsivi.com\/?p=2182"},"modified":"2014-03-09T17:40:59","modified_gmt":"2014-03-09T15:40:59","slug":"rain-alarm","status":"publish","type":"post","link":"https:\/\/devrearsivi.com\/rain-alarm\/","title":{"rendered":"Rain Alarm"},"content":{"rendered":"<p align=\"left\"><em><strong><span style=\"color: silver; font-family: Arial; font-size: small;\">This circuit gives out an alarm when its sensor is wetted by water.<br \/>\nA 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water.<br \/>\nThe sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz.<\/span><\/strong><\/em><\/p>\n<p align=\"left\"><em><strong><span style=\"color: silver; font-family: Arial; font-size: small;\">The sensor is also shown in the circuit diagram.<br \/>\nIt has to placed making an angle of about 30 &#8211; 45 degrees to the ground. This makes the rain water to flow through it to the ground and prevents the alarm from going on due to the stored water on the sensor.<br \/>\nThe metal used to make the sensor has to be aluminium and not copper. This is because copper forms a blue oxide on its layer on prolonged exposure to moisture and has to be cleaned regularly.<br \/>\nThe aluminium foils may be secured to the wooden \/ plastic board via epoxy adhesive or small screws.<br \/>\nThe contact X and Y from the sensor may be obtained by small crocodile clips or you may use screws.<\/span><\/strong><\/em><\/p>\n<p align=\"left\">\n<p align=\"left\"><a href=\"http:\/\/www.devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain.gif\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-medium wp-image-2183 aligncenter\" alt=\"rain\" src=\"http:\/\/www.devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-300x300.gif\" width=\"300\" height=\"300\" srcset=\"https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-300x300.gif 300w, https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-150x150.gif 150w, https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-55x55.gif 55w, https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-500x498.gif 500w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This circuit gives out an alarm when its sensor is wetted by water. A 555&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2185,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[723],"tags":[828,827,826],"aioseo_notices":[],"featured_image_urls":{"full":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"thumbnail":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1-150x150.jpg",150,150,true],"medium":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1-300x146.jpg",300,146,true],"medium_large":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"large":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"1536x1536":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"2048x2048":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"covernews-slider-full":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"covernews-slider-center":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"covernews-featured":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"covernews-medium":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false],"covernews-medium-square":["https:\/\/devrearsivi.com\/wp-content\/uploads\/2014\/03\/rain-alarm-1.jpg",321,157,false]},"author_info":{"display_name":"Ferhat \u00c7elik","author_link":"https:\/\/devrearsivi.com\/author\/94ferhat\/"},"category_info":"<a href=\"https:\/\/devrearsivi.com\/category\/electronics-circuits\/\" rel=\"category tag\">Electronics circuits<\/a>","tag_info":"Electronics circuits","comment_count":"0","_links":{"self":[{"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/posts\/2182"}],"collection":[{"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/comments?post=2182"}],"version-history":[{"count":2,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/posts\/2182\/revisions"}],"predecessor-version":[{"id":2186,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/posts\/2182\/revisions\/2186"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/media\/2185"}],"wp:attachment":[{"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/media?parent=2182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/categories?post=2182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devrearsivi.com\/wp-json\/wp\/v2\/tags?post=2182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}