diff --git a/uhr.py b/uhr.py
index 845de43..b0db224 100644
--- a/uhr.py
+++ b/uhr.py
@@ -12,6 +12,18 @@ import toml
 import neopixel
 import board
 
+SKRIPTPFAD = os.path.abspath(os.path.dirname(__file__))
+
+
+def load_config(pfad=SKRIPTPFAD):
+    configfile = os.path.join(pfad, "uhr_cfg.toml")
+    with open(configfile) as conffile:
+        config = toml.loads(conffile.read())
+    return config
+
+
+CONFIG = load_config()
+
 
 # LED strip configuration
 LED_COUNT = 60      # Number of LED pixels.
@@ -60,12 +72,10 @@ class Uhr:
         self.set_helligkeit(self.helligkeit)
 
 
-# # # # # # # # # #
-# GPIO:
-# # # # # # # # # #
+# GPIO
 I_MODE_TASTER = gpiozero.Button(3)
 I_PLUS_TASTER = gpiozero.Button(4)
-I_MINUS_TASTER = gpiozero.Button(14)
+I_MINUS_TASTER = gpiozero.Button(17)
 
 
 # # # # # # # # # #
@@ -150,7 +160,7 @@ def check_anwesenheit(uhr):
     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):
+    def ping_ping(ip):
         """pingt die IP 2x an
         return (0 | !0) 0 wenn erreichbar"""
         befehl = "ping -c2 -W1 {}".format(ip)
@@ -164,11 +174,16 @@ def check_anwesenheit(uhr):
         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())["ping"]
+    def ping_arping(ip, interface):
+        """pingt die IP 3x an
+               return (0 | !0) 0 wenn erreichbar
+        """
+        befehl = "/usr/bin/arping -c 3 -w 10 -b -f -I {interface} {ip}".format(interface=interface, ip=ip)
+        cmd = shlex.split(befehl)
+        return subprocess.call(cmd)
+
+    wlanliste = CONFIG["ping"]
+    interface = CONFIG["interface"]
     status_anwesend_liste = [] 
     delta = datetime.timedelta(seconds=301)
     last = datetime.datetime.now()
@@ -181,10 +196,12 @@ def check_anwesenheit(uhr):
             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)
+                        if key_funkart == "ping":
+                            status_return = ping_ping(ip)
                         elif key_funkart == "bt":
                             status_return = ping_bt(ip)
+                        elif key_funkart == "arping":
+                            status_return = ping_arping(ip, interface)
                         else:
                             status_return = False
                         if not status_return: