24-07-2014, 11:05 AM
LAPTOP THEFT IDENTIFIER.
[attachment=66180]
ABSTRACT
Objective:
The objective of this project is to identify the theft identification in a particular product for example laptop.
INTRODUCTION
An accelerometer is a device that measures proper acceleration. Most accelerometers do not display the value, but supply it to other devices.
An accelerometer measures proper acceleration, which is the acceleration it experiences relative to free fall and is the acceleration felt by people and objects. Put another way, at any point in space time the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. Such accelerations are popularly measured in terms of g-force.
Comparator:
In electronics, a comparator is a device which compares two voltages or currents and switches its output to indicate which is larger.
An operational amplifier (op-amp) has a well balanced difference input and a very high gain. The parallels in the characteristics allows the op-amps to serve as comparators in some functions.
ALARM:
An alarm gives an audible or visual warning about a problem or condition.
Alarms include:
alarm clocks can produce an alarm at a given time.
burglar alarms, designed to warn of burglaries; this is often a silent alarm: the police or guards are warned without indication to the burglar, which increases the chances of catching people.
Circuit description
The circuit is designed to control the buzzer. The buzzer ON and OFF is controlled by the pair of switching transistors (BC 547). The buzzer is connected in the Q2 transistor collector terminal.
When high pulse signal is given to base of the Q1 transistors, the transistor is conducting and close the collector and emitter terminal so zero signals is given to base of the Q2 transistor. Hence Q2 transistor and buzzer is turned OFF state.
When low pulse is given to base of transistor Q1 transistor, the transistor is turned OFF.
Now 12v is given to base of Q2 transistor so the transistor is conducting and buzzer is energized and produces the sound signal.
IC voltage regulators:
Voltage regulators comprise a class of widely used ICs.
Regulator IC units contain the circuitry for reference source, comparator amplifier, control device, and overload protection all in a single IC.
[attachment=66180]
ABSTRACT
Objective:
The objective of this project is to identify the theft identification in a particular product for example laptop.
INTRODUCTION
An accelerometer is a device that measures proper acceleration. Most accelerometers do not display the value, but supply it to other devices.
An accelerometer measures proper acceleration, which is the acceleration it experiences relative to free fall and is the acceleration felt by people and objects. Put another way, at any point in space time the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. Such accelerations are popularly measured in terms of g-force.
Comparator:
In electronics, a comparator is a device which compares two voltages or currents and switches its output to indicate which is larger.
An operational amplifier (op-amp) has a well balanced difference input and a very high gain. The parallels in the characteristics allows the op-amps to serve as comparators in some functions.
ALARM:
An alarm gives an audible or visual warning about a problem or condition.
Alarms include:
alarm clocks can produce an alarm at a given time.
burglar alarms, designed to warn of burglaries; this is often a silent alarm: the police or guards are warned without indication to the burglar, which increases the chances of catching people.
Circuit description
The circuit is designed to control the buzzer. The buzzer ON and OFF is controlled by the pair of switching transistors (BC 547). The buzzer is connected in the Q2 transistor collector terminal.
When high pulse signal is given to base of the Q1 transistors, the transistor is conducting and close the collector and emitter terminal so zero signals is given to base of the Q2 transistor. Hence Q2 transistor and buzzer is turned OFF state.
When low pulse is given to base of transistor Q1 transistor, the transistor is turned OFF.
Now 12v is given to base of Q2 transistor so the transistor is conducting and buzzer is energized and produces the sound signal.
IC voltage regulators:
Voltage regulators comprise a class of widely used ICs.
Regulator IC units contain the circuitry for reference source, comparator amplifier, control device, and overload protection all in a single IC.