This simple Door Chime protects the door and gives a loud Alarm tone when there is an attempt of theft. The circuit is too simple and battery operated. A Normally Closed (NC) reed switch and magnet is ...

Now you can build your own simple door alarm security system using a tiny microcontroller chip PIC12F635! The circuit is nothing but an aural alert unit, which raises ...

I was flipping through my deadtree archive of magazines recently when I came across an ad for an ingenious little door alarm in 1906. Granted, it’s not fancy. But it probably did the trick. As you can ...

Learn how to make a simple door alarm to enhance your home security with our step-by-step guide. This DIY theft alert alarm is perfect for keeping unwanted guests away and protecting your belongings.