Making your own security system isn’t too hard. If you’d like one that is cheap and simple, Instructables user deba168 shows how to make a wireless motion detector with an Arduino.
If you’ve recently started making things with electronics, you know how steep the learning curve can be. Fortunately, littleBits are an easy way to start experimenting with all kinds of projects. You can connect real-world components to the cloud instantly, program If This Then That recipes, and even connect it all to an Arduino. Here’s how to get started.
DIY musical instruments are a whole different ball game. If you’re looking for a place to start, Adafruit has a guide to building your own MIDI controller using an Arduino.
If you’re tired of forgetting your house keys or garage door opener, Instructables user nodcah shows you how you can make your finger the only thing you need to access your abode.
If you have an old iPod collecting dust, DIY site Erroneous Data Projects shows off how to add Bluetooth to the iPod so you can share your music with an Android app.
If you’ve ever wondered where your dog actually goes when you let him off his leash, or what your cat does while you sleep, this GPS-logging harness, packed with wearable electronics, can put it all on a map for you. Best of all, you could wear it yourself.
We generally use passwords to lock people out of our computers. But Instructables user Thomas_Kirkup found a way to use an actual, physical key — like the one on your door — to lock and unlock your PC.