diff --git a/code/piplayer2.py b/code/piplayer2.py
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--- /dev/null
+++ b/code/piplayer2.py
@@ -0,0 +1,31 @@
+# piplayer2
+# http://www.tilman.de/piplayer2
+
+
+import RPi.GPIO as GPIO
+import time
+
+# photo sensor on PIN 17
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(17, GPIO.IN)
+
+# LED on PIN 27
+GPIO.setup(27, GPIO.OUT)
+GPIO.output(27, GPIO.LOW)
+
+try:
+    print('Start sensor test')
+    
+    while True:
+        time.sleep(0.25)
+        if (GPIO.input(17) == GPIO.LOW):
+            print('LOW')
+            GPIO.output(27, GPIO.LOW)
+        else:
+            print('HIGH')
+            GPIO.output(27, GPIO.HIGH)
+
+except KeyboardInterrupt:
+    print('bye')
+    GPIO.cleanup()
+
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diff --git a/code/sounds/ok.mp3 b/code/sounds/ok.mp3
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diff --git a/code/sounds/scanning.mp3 b/code/sounds/scanning.mp3
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diff --git a/misc/electronics-final.fzz b/misc/electronics-final.fzz
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