In this step-by-step tutorial, you'll learn how to make a very loud, simple, and powerful alarm using everyday materials.

There’s a huge market for 433 MHz alarm system hardware out there, from PIR motion detectors to door and window sensors. If you want to put them to work, all you need is a receiver, a network ...

Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor based design. Home made Tilt sensor for ...

Window sensor alarms may seem sophisticated, but they are surprisingly simple. At their core, window sensors rely on magnetism and a basic electronic switch.