28 Jan '15, 3am

Motion Activated Alarm for your Bag

Motion Activated Alarm for your Bag

Many of us carry around a bag with our expensive personal belongings. It can be a pain to carry a bag around with you all day though. If you want to set it down for a while, you often have to try to keep an eye on it to ensure that no one steals it. [Micamelnyk] decided to build a solution to this problem in the form of a motion sensing alarm . The device is built around a Trinket Pro . The Trinket Pro is a sort of break out board for the ATMega328. It’s compatible with the Arduino IDE and also contains a USB port for easy programming. The Trinket is hooked up to a GY-521 accelerometer, which allows it to detect motion. When the Trinket senses that the device has been moved, it emits a loud high-pitched whine from a piezo speaker. To arm the device, the user first holds the power button for 3 seconds. Then the user has ten seconds to enter their secret code. This ensures t...

Full article: http://hackaday.com/2015/01/27/motion-activated-alarm-for...

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