diff --git a/watchdoor.py b/watchdoor.py
new file mode 100644
index 0000000..bfaa17a
--- /dev/null
+++ b/watchdoor.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+#coding: utf8 
+
+# file: watchdoor.py
+# date: 06.09.2020
+# mail: berhsi@web.de
+# desc: deamon who deals with edge detection at pin 18
+
+import time
+import logging
+import RPi.GPIO as GPIO
+
+loglevel = logging.INFO
+formatstring = '%(asctime)s: %(levelname)s: %(message)s'
+logging.basicConfig(format=formatstring, level=loglevel)
+
+GPIO.setmode(GPIO.BOARD)                              # kind of enumeration
+GPIO.setup(18, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) # pin 18 (GPIO 24)
+channel = 18
+
+def voltage_changed(channel):
+    '''
+    callback-function
+    '''
+    if GPIO.input(channel) == GPIO.HIGH:
+        # door closed -> pin hight
+        logging.info('Pin high triggered - Space closed')
+    else:
+        # door open -> pin low
+        logging.info('Pin low triggered - Space is open')
+
+def main():
+    '''
+    '''
+    logging.info('watchdoor.py started')
+    GPIO.add_event_detect(channel,
+                          GPIO.BOTH,
+                          callback = voltage_changed,
+                          bouncetime = 200)
+    while 1:
+        time.sleep(0.1)
+
+
+if __name__ == '__main__':
+    main()