1.0siratekhttps://siratek.netsiratekhttps://siratek.netrich600338<blockquote class="wp-embedded-content" data-secret="BMBt7EqqOP"><a href="https://siratek.net/index.php/tutorials/rain-water-sensor/">Water Level and Rain Detection</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://siratek.net/index.php/tutorials/rain-water-sensor/embed/#?secret=BMBt7EqqOP" width="600" height="338" title="“Water Level and Rain Detection” — siratek" data-secret="BMBt7EqqOP" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://siratek.net/wp-includes/js/wp-embed.min.js </script> A red board with a comb of interleaved copper tracks. Water bridging the tracks lowers the resistance between them, and the further up the comb the water reaches, the more tracks are bridged and the lower the resistance goes.https://siratek.net/wp-content/uploads/2026/11/rain-water-sensor-wiring.svg