Update settings.html

settings.html

@@ -149,5 +149,15 @@ input[type="number"] {
     fetchValues();
     setInterval(fetchValues, 10000);
   </script>
+
+  <script>
+  document.getElementById("pH_set_but").addEventListener("click", function() {
+    var pHValue = document.getElementById("pH_set").value;
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", "/pH_set?value=" + pHValue, true);
+    xhr.send();
+});
+  </script>
+  
 </body>
 </html>