01-06-2013, 03:25 PM
LAPTOP THEFT IDENTIFIER
LAPTOP THEFT.doc (Size: 29.5 KB / Downloads: 30)
Objective:
The objective of this project is to identify the theft identification in a particular product for example laptop.
Functions:
In this project consists of
Accelerometer with comparator circuit.
Driver circuit.
Alarm circuit.
An accelerometer is a device that measures the vibration, or acceleration of motion of a structure. The force caused by vibration or a change in motion (acceleration) causes the mass to "squeeze" the piezoelectric material which produces an electrical charge that is proportional to the force exerted upon it. Since the charge is proportional to the force, and the mass is a constant, then the charge is also proportional to the acceleration.
There are two types of piezoelectric accelerometers (vibration sensors). This type of accelerometer is also used in high temperature applications (>120C) where low impedance models can not be used. A low impedance accelerometer has a charge accelerometer as its front end but has a tiny built-in micro-circuit and FET transistor that converts that charge into a low impedance voltage that can easily interface with standard instrumentation. This type of accelerometer is commonly used in industry.
In this type of accelerometer is fixed in the laptop. So when ever the laptop moves or it ill take vibration the alarm will indicate the theft. So we can easily identify the theft.
Applications:
Accelerometers can be used to measure vehicle acceleration and deceleration. Many laptops feature an accelerometer, such as Lenovo's (formerly IBM's) Active Protection System, and Apple's Sudden Motion Sensor, which is used to detect drops. If a drop is detected, the heads of the hard disk are parked to avoid data loss by the ensuing shock.