This DIY gas leakage detector is designed for educational and basic monitoring purposes. For critical safety applications, ...

The 9V battery powered circuit produces a loud, wailing sound as a warning signal. As well, one red-colored LED (shines like a beacon) provides the visual alert. After construction and testing, you ...

Here is an ultra simple Arduino Night Alarm project wired around a handful of inexpensive and easily available components. One advantage of using Arduino as a security system is the flexibility!

However, if you’re just looking to catch a sandwich thief at work or a cat spilling over all you water bottles, then Make shows you how to build an alarm system with an Arduino and a USB camera.