Window sensors are a critical part of any home security system. Learn how they work so you can ensure this last line of defense is there when you need it.

After mastering a few basic sensor tasks, you could easily link your PIR sensor to a microprocessor, using the set-up to track household activity, create your own alarm system, program a smart ...

MIT researchers have created a new underwater sensor and communication system that doesn't require batteries, and barely uses any power at all. This could ...