When reed switch is opened, pin 2 of Arduino goes high with the help of the pull-up resistor R2, and the alert signal is available through the piezo-speaker PZ1 (not an active piezo-buzzer). At the ...

Even though you can drive a logic-level MOSFET directly from the I/O of an Arduino, it’d be better to add a 100-Ω current limiter resistor (R1) in between to protect the I/O. Furthermore, another ...

Posted in Security Hacks Tagged alarm, arduino, arduino mega, gsm, i2c, rfid, security ← Homemade Portable Gold Mining Trommel Soundwave Tunes Up Your Portable Workbench → ...

Instead, Make shows you how to build an internet-connected alarm clock using an Arduino and Google. All you'll need is an Arduino Yúnm a touch screen, a USB speaker, and a few cables.

You'll need an Arduino along with a bunch of various sensors to get the project rolling, and once it's all set up you'll have a simple, but cheap system to monitor your home.