diff --git a/doorbell/klingel_v3_wemos/klingel_v3_wemos.ino b/doorbell/klingel_v3_wemos/klingel_v3_wemos.ino
index 16d0fd1..ae7b1a3 100644
--- a/doorbell/klingel_v3_wemos/klingel_v3_wemos.ino
+++ b/doorbell/klingel_v3_wemos/klingel_v3_wemos.ino
@@ -1,5 +1,8 @@
 /*
  * dfPlayer auf Wemos D1: https://forum.arduino.cc/t/dfplayer-mini-mit-wemos-d1-uno/677980/3
+ * Details dfPlayer: https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299#target_3
+ *                   https://wolles-elektronikkiste.de/dfplayer-mini-ansteuerung-mit-dem-arduino
+ * W5500 Ethernet Shield: https://www.arduino.cc/en/Tutorial/LibraryExamples/WebServer
  */
 
 #include "DFRobotDFPlayerMini.h"
@@ -10,12 +13,15 @@
 
 
 DFRobotDFPlayerMini dfPlayer;
-int volume = 5;
+int volume = 22;
 
 byte mac[] = { 0x02, 0x60, 0x0D, 0xF0, 0x0D, 0x04 };
 IPAddress ip(192, 168, 178, 60);
 EthernetServer server(80);
 
+String header;
+String body;
+unsigned long lastring = 0;
 
 void setup() {
   WiFi.mode(WIFI_OFF);
@@ -23,20 +29,21 @@ void setup() {
   Serial.begin(115200);
   Serial.println();
   Serial.println("Starting server");
-  
+
   Ethernet.init(5); // W5500 CS PIN auf D1
   Ethernet.begin(mac, ip);
 
   if (Ethernet.hardwareStatus() == EthernetNoHardware) {
     Serial.println("Ethernet shield not found");
     while (true) {
-      delay(1);
+      delay(5000);
     }
   }
-  if (Ethernet.linkStatus() == LinkOFF) {
-    Serial.println("Ethernet cable is not connected.");
+  
+  while (Ethernet.linkStatus() == LinkOFF) {
+    Serial.println("Ethernet cable is not connected");
+    delay(5000);
   }
-
   
   Serial1.begin(9600);// TX liegt auf Pin D4 RX geht nicht !!
 
@@ -56,7 +63,6 @@ void setup() {
 void loop() {
   EthernetClient client = server.available();
   if (client) {
-    Serial.println("new client");
     // an http request ends with a blank line
     bool currentLineIsBlank = true;
 
@@ -86,32 +92,136 @@ void loop() {
         }
 
         Serial.write(c);
+        header += c;
+        
         // if you've gotten to the end of the line (received a newline
         // character) and the line is blank, the http request has ended,
         // so you can send a reply
         if (c == '\n' && currentLineIsBlank) {
+          if (header.indexOf("GET /status") >= 0) {
+            client.println("HTTP/1.1 200 OK");
+            client.println("Content-type: application/json; charset=utf-8");
+            client.println("Connection: close");
+            client.println();
+            client.println("{");
+            client.println("  \"online\": true,");
+            client.print("  \"volume\": ");
+            client.print(volume);
+            client.println(",");
+            client.print("  \"lastring\": ");
+            if (lastring <= 0) {
+              client.println(-1);
+            }
+            else {
+              client.println(millis() - lastring);
+            }
+            client.println("}");
+            break;
+          }
+          else if (header.indexOf("PUT /volume") >= 0) {
+            while (client.connected()) {
+              char c = client.read();
+              body += c;
+              if (c == '}') {
+                break;
+              }
+            }
+            
+            String str1 = body;
+            str1 = str1.substring(str1.indexOf("value"));
+            str1 = str1.substring(str1.indexOf(":") + 1);
+            while (str1.length() > 0 && str1.startsWith(" ")) {
+              str1 = str1.substring(1);
+            }
+
+            int ix = 0;
+            while (isDigit(str1.charAt(ix))) {
+              ix++;
+            }
+
+            if (ix > 0) {
+              volume = str1.substring(0, ix).toInt();
+              if (volume < 0) {
+                volume = 0;
+              }
+              else if (volume > 30) {
+                volume = 30;
+              }
+              
+              dfPlayer.volume(volume);
+              Serial.print("Volume set to ");
+              Serial.println(volume);
+              
+              client.println("HTTP/1.1 200 OK");
+            }
+            else {
+              client.println("HTTP/1.1 400 Bad Request");                  
+            }
+            
+            client.println("Connection: close");
+            break;
+          }
+          
           // send a standard http response header
           client.println("HTTP/1.1 200 OK");
-          client.println("Content-Type: text/plain");
-          client.println("Connection: close");  // the connection will be closed after completion of the response
+          client.println("Content-type: text/html; charset=utf-8");
+          client.println("Connection: close");
           client.println();
-          client.println("bonjour");
-          dfPlayer.play(1);
+          
+          // turns the GPIOs on and off
+          if (header.indexOf("GET /bell/on") >= 0) {
+            dfPlayer.play(1);  // play the first mp3
+            lastring = millis();
+          }
+          else if (header.indexOf("GET /setvolume/") >= 0) { // yes, I know this is not RESTful
+            String str1 = header;
+            str1 = str1.substring(header.indexOf("GET /setvolume/") + 15);
+            volume = str1.substring(0, str1.indexOf(" ")).toInt();
+            
+            if (volume < 0) {
+              volume = 0;
+            }
+            else if (volume > 30) {
+              volume = 30;
+            }
+            
+            dfPlayer.volume(volume);
+            Serial.print("Volume set to ");
+            Serial.println(volume);
+          }
+
+          // Display the HTML web page
+          client.println("<!DOCTYPE html><html>");
+          client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
+          client.println("<link rel=\"icon\" href=\"data:,\">");
+          client.println("<style>html { font-family: sans-serif; display: inline-block; margin: 0px auto; text-align: center; }");
+          client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px; text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
+          client.println(".button2 { background-color: #4CAF50; border: none; color: white; padding: 4px 10px; text-decoration: none; margin: 1px; cursor: pointer;}</style></head>");
+          
+          client.println("<body><h1>LeWe T&uuml;rklingel</h1>");
+          client.println("<p>Volume: <a href=\"/setvolume/" + String(volume-1) + "\"><button class=\"button2\">&minus;</button></a> " + String(volume) + " <a href=\"/setvolume/" + String(volume+1) + "\"><button class=\"button2\">&plus;</button></a></p>");
+          client.println("<p><a href=\"/bell/on\"><button class=\"button\">Klingeln</button></a></p>");
+          client.println("</body></html>");
+          
+          // The HTTP response ends with another blank line
+          client.println();
+          
           break;
         }
         if (c == '\n') {
-          // you're starting a new line
           currentLineIsBlank = true;
         } else if (c != '\r') {
-          // you've gotten a character on the current line
           currentLineIsBlank = false;
         }
       }
     }
+    
+    header = "";
+    body = "";
+    
     // give the web browser time to receive the data
     delay(10);
-    // close the connection:
     client.stop();
-    Serial.println("client disconnected");
+    Serial.println("Client disconnected");
   }
-}
\ No newline at end of file
+}