Professionally-installed security systems can be expensive and require contracts; instead, we examine some of the growing number of low-cost DIY alternatives.

Making your own security system isn't too hard, but if you'd like a super cheap and simple method, Instructables user deba168 shows how to make a wireless motion detector with an Arduino.

He figured that monitoring the alarm’s LEDs would make the most sense, so he used a bit of Ethernet cable and wired all of the system’s indicators to his Arduino board.

Home security systems can be complicated. We explain all you need to know to make an informed purchase, including how they work and what features to look for.

From how many of these are on eBay, and the research I’ve done on some home alarm system forums, it appears that you can actually pick one of these up on the second-hand market and spin your own ...

We explain all you need to know to make an informed purchase of a home security system, including how they work and what features to look for.