Complete instructions for this episode of Weekend Projects can be found at http://makeprojects.com/Project/PIR+Sensor+Arduino+Alarm/72/1 This project is great for those beginning to build with Arduino, and requires no soldering. Using very few components, and some jumper wire, we'll build a simple motion-sensing alarm. This project combines technologies we've used in previous Weekend Projects, including a PIR sensor and piezo buzzer. It's great for practical jokes and doubles as an early warning system for the zombie invasion!
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