Here's how to change your iPhone's default notification tone.

Learn how to make a simple fire alarm with our step-by-step guide in this video! Discover the essential components and ...

In this step-by-step tutorial, learn how to make a powerful alarm at home using a DC motor. Perfect for DIY enthusiasts, this video guides you through the entire process with clear instructions.

Abstract: This paper designs and realizes a marine engine room monitoring and alarm system based on the controller of Siemens PLC, introduces the design means and the practice process in detail, ...