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Great Instructable! I'm just confused why you would use an ultrasonic sensor to control your voltage output?
Found this a while ago after I broke my first hammer trying to disassemble a pallet. With a good handle you can tear down a pallet in less than 5 minutes. I got a guy on craigslist to throw it together for me for $20. Has saved me hundreds of dollars in lumber!
How to: Multiple Buttons on 1 Analog Pin - Arduino Tutorial
diy sump filter for aquariums