Motion sensors are pretty useful — but they’re just so darn ugly! Well — if you’re a Whovian — maybe this hack is for you. A 3D printed TARDIS Motion Sensor Alarm! As it turns out, it ...

The Lock Alarm attaches to your notebook and features a motion sensor and a combination lock. If the device is moved without the proper combination being entered within a short amount of time a ...

The motion sensor switch circuit can automatically turn on a water sprinkler but you can easily use it as a motion sensor light switch or motion activated alarm too.