June 7, 2015 Add as a preferred source on Google Add as a preferred source on Google Alarm clocks are cheap and abundant, but they’re pretty boring. If you want to make your own, Instructables user ...

August 11, 2014 Add as a preferred source on Google Add as a preferred source on Google Deba168's system uses two Arduinos, an RF transmitter, a motion sensor, and a few other parts to piece it all ...

There’s a huge market for 433 MHz alarm system hardware out there, from PIR motion detectors to door and window sensors. If you want to put them to work, all you need is a receiver, a network-enabled ...

Here is a simple general-purpose security alarm circuit built on the Arduino platform. It brings up an obtrusive alert signal when an intrusion/theft attempt is observed by its front-end sensor. In ...