diff --git a/doorbell/klingel_sender_nano_serial/doorbell.py b/doorbell/klingel_sender_nano_serial/doorbell.py
index cf1ef29..9eedcb7 100644
--- a/doorbell/klingel_sender_nano_serial/doorbell.py
+++ b/doorbell/klingel_sender_nano_serial/doorbell.py
@@ -34,16 +34,16 @@ while True:
 
                 # send MQTT
                 headers = {
-                    "Content-Type": "application/json",
-                    "Authorization": "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJjYjY5NjA5NmY0N2E0NmZlOGEzYjczOGYzYmUzOTk5ZSIsImlhdCI6MTY2MTM0NDgxOSwiZXhwIjoxOTc2NzA0ODE5fQ.z9fzbVOA1Pbur3Zb07481n-SoYesj8cetw-CX6WPmTs"
+#                    "Authorization": "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJjYjY5NjA5NmY0N2E0NmZlOGEzYjczOGYzYmUzOTk5ZSIsImlhdCI6MTY2MTM0NDgxOSwiZXhwIjoxOTc2NzA0ODE5fQ.z9fzbVOA1Pbur3Zb07481n-SoYesj8cetw-CX6WPmTs",
+                     "Content-Type": "application/json"
                 }
                 data = json.dumps({'payload': 'RING', 'topic': 'lewe/doorbell', 'retain': 'False'}).encode('utf8')
                 request = urllib.request.Request("localhost:8123/api/services/mqtt/publish", data, headers)
 #                request = urllib.request.Request("https://www.nodebucket.de:8123/api/services/mqtt/publish", data, headers)
                 response = urllib.request.urlopen(reqest)
-            except Exception:
+            except Exception as err:
                 logger.error("Could not ring doorbell")
-#                logger.exception("Could not ring doorbell")
+                logger.error(err.message)
                 time.sleep(300)
             else:
                 logger.info(data)
diff --git a/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
index 3c7a30d..115b987 100644
--- a/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
+++ b/doorbell/klingel_sender_nano_serial/klingel_sender_nano_serial.ino
@@ -1,4 +1,5 @@
-/*
+/*  Klingel-Sensor auf Arduino Nano ATmega168
+ * 
  *  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button
  * 
  *  D2  -------------
@@ -13,7 +14,7 @@
 
 const int ledPin = LED_BUILTIN;
 const int buttonPin = 2; // Button connected to D2
-const int flare_threshold = 120;
+const int flare_threshold = 60;
 
 bool active = false;