I ran across this related project today. Not quite as complicated but still something fun!
I like the use of an ultra-sonic sensor to sense when a person is standing in front of it. However I could see this getting annoying if you were just passing by. It’s also a nice refresher on how to use MOSFET’s to boost current needs for brighter LED’s. Since the Arduino can only pump out about 40mA per channel, using MOSFET’s with a separate power supply is a great way to get those super bright LED’s what they need to shine. He also used a nice Arduino prototype shield to solder his components together.
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