diff --git a/uhr.py b/uhr.py
index 7482221..edf69c9 100644
--- a/uhr.py
+++ b/uhr.py
@@ -4,7 +4,6 @@ import datetime
 import os
 import shlex
 import subprocess
-import sys
 import threading
 import time
 
@@ -17,9 +16,8 @@ import board
 # LED strip configuration
 LED_COUNT = 60      # Number of LED pixels.
 LED_PIN = board.D18      # GPIO pin connected to the pixels (must support PWM!).
-LED_FREQ_HZ = 800000  # LED signal frequency in hertz (usually 800khz)
 LED_PIXEL_ORDER = neopixel.GRB   # Strip type and colour ordering
-LED_BRIGHTNESS = 0.2
+LED_BRIGHTNESS = 0.1
 
 # Zahl stellt den Wert in Minuten dar, wie lange kein Gerät erreichbar sein darf dass die Uhr "abgeschalten" wird
 ABSCHALTWERT = 4
@@ -40,6 +38,16 @@ std11 = [54, 55, 56]
 stdliste = [std0, std1, std2, std3, std4, std5, std6, std7, std8, std9, std10, std11]
 
 
+class Uhr:
+    def __init__(self, pixels):
+        self.helligkeit = pixels.brightness
+        self.pixels = pixels
+
+    def set_helligkeit(self, helligkeit):
+        self.helligkeit = helligkeit
+        self.pixels.brightness = self.helligkeit
+
+
 # # # # # # # # # #
 # GPIO:
 # # # # # # # # # #
@@ -123,53 +131,41 @@ def shutdown():
 
 
 # Threads
-def check_anwesenheit(pixels):
+def check_anwesenheit(uhr):
     """Funktion, welche als eigener Thread laeuft, um selbststaendig in einem gewissenen Intervall
     alle Geraete in der Toml Liste zu pingen
     arg: Objekt des neopixel LED Ringes
     toml File: status "anwesend", ist kein Geraet von "anwesend" oder "dimmen" erreichbar, LED Helligkeit auf 0
     sobald eine Adresse von status "dimmen" erreichbar ist, wird die Helligkeit verringert"""
-    def ping_wlan(ip):
-        """pingt die IP 2x an
+
+    def ping_device(mac):
+        """pingt das Gerät 2x an
         return (0 | !0) 0 wenn erreichbar"""
-        befehl = "ping -c2 -W1 {}".format(ip)
+        befehl = "sudo arping -c2 {}".format(mac)
         cmd = shlex.split(befehl)
         return subprocess.call(cmd)
     
-    def ping_bt(bt):
-        """pingt die IP 2x an
-        return (0 | !0) 0 wenn erreichbar"""
-        befehl = "sudo /usr/bin/l2ping -c1 -t1 {}".format(bt)
-        cmd = shlex.split(befehl)
-        return subprocess.call(cmd)    
-    
     # Tomlfile mit den IP Adressen einlesen
     pfad = os.path.abspath(os.path.dirname(__file__))
     configfile = os.path.join(pfad, "bt_wlan.toml")
     with open(configfile) as conffile:
-        wlanliste = toml.loads(conffile.read())   
+        wlanliste = toml.loads(conffile.read())["arping"]
     status_anwesend_liste = [] 
     delta = datetime.timedelta(seconds=301)
     last = datetime.datetime.now()
     status = {}
     while True:
         now = datetime.datetime.now()
-        # Status der IP Adressen ermitteln
+        # Status der Geräte ermitteln
         if delta.seconds > 300:
             for key_status in wlanliste.keys():
-                for key_funkart in wlanliste[key_status].keys():
-                    for ip in wlanliste[key_status][key_funkart]:
-                        if key_funkart == "wlan":
-                            status_return = ping_wlan(ip)
-                        elif key_funkart == "bt":
-                            status_return = ping_bt(ip)
-                        else:
-                            status_return = False
-                        if not status_return:
-                            status[key_status] = True
-                            break
-                        else:
-                            status[key_status] = False
+                for mac in wlanliste[key_status]:
+                    status_return = ping_device(mac)
+                    if not status_return:
+                        status[key_status] = True
+                        break
+                    else:
+                        status[key_status] = False
             if status["anwesend"]:
                 status_anwesend_liste = []  # Geraet von anwesend erreichbar
                 helligkeit = LED_BRIGHTNESS
@@ -183,7 +179,7 @@ def check_anwesenheit(pixels):
                 helligkeit = LED_BRIGHTNESS * 0.5
             if now.hour < 5 and not status["dimmen"]:
                 helligkeit = 0
-            pixels.brightness = helligkeit
+            uhr.set_helligkeit(helligkeit)
             last = datetime.datetime.now()
         delta = now - last
         time.sleep(30)
@@ -196,21 +192,20 @@ def main():
     pixels = neopixel.NeoPixel(LED_PIN, LED_COUNT, brightness=LED_BRIGHTNESS,
                                auto_write=False, pixel_order=LED_PIXEL_ORDER)
 
-    thread_check_wlan = threading.Thread(target=check_anwesenheit, args=(pixels,))
+    uhr = Uhr(pixels)
+    thread_check_wlan = threading.Thread(target=check_anwesenheit, args=(uhr,))
     thread_check_wlan.start()
     alle_led(rgbconf["rgb_leer"][0], rgbconf["rgb_leer"][1], rgbconf["rgb_leer"][2], pixels)
-    while True:
-        try:
+    try:
+        while True:
             rgbconf = rgb_standard()
             now = datetime.datetime.now()
             if lastsecond != now.second:
                 lastsecond, led_gesetzt = led_calc(now, stdliste, rgbconf, led_gesetzt, pixels)
             time.sleep(0.2)
-        except KeyboardInterrupt:
-            print("KeyboardInterrupt")
-            pixels.brightness = 0
-            alle_led(0, 0, 0, pixels)
-            sys.exit()
+    finally:
+        pixels.brightness = 0
+        alle_led(0, 0, 0, pixels)
 
 
 if __name__ == "__main__":