Here is a great mod for a reef(wreaths) that has LED's on it. Use the Mediatek LinkIt ONE board board with a SD card to hold Holiday songs which are played when some one is at the door.An Ultrasonic sensor is used to detect if there is someone at the door and I am using a light and small portable speaker that fits behind the reef. In addition if you have a 3D printer , print the STL attached in step 4 to house/protect the LinkIt ONE.
http://bit.ly/1QfMrsG
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