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Keep It Simple & Silent. Homemade car alarms unlike any that exist anywhere. Simple. With a drill, wire, 12v relay, soldering iron, wireless doorbell system, & 15 min. I can show you how to make a silent $15 car alarm with a panic/alert button.
Web site: http://www.makerfaire.com/
Derek Carlon
After my wife and I nearly had our Honda stolen in college, I knew that somehow I needed to create a car alarm that we could afford...something for a few dollars. While shopping in Wal-Mart I eyed a wireless doorbell system for $13 and figured that somehow I could make a car alarm out of it. So I did.