【17 Ringtones & 5 Welcomes Doorbell Rings】Welcome / Doorbell / Alarm ... motion sensor detector at the porch, gallery, mailbox and put the receiver in your house. 【Easy to install ...

Powered by an Arduino Uno, this laser tripwire alarm ... sensors. If you're looking to make your garbage can even smarter, you might want to take on this trash bin waste level detector as an easy ...

and it’s easy to use all kinds of gear—even stuff you bodge together yourself. [Jeff Sandberg] demonstrates that ably with his project to use ancient 1990s burglar alarm sensors in his modern ...