Table of Contents
Introduction:
The main reason behind this concept is the increased rate of terrorist attacks in India in recent years. There are several reasons for this and one of the main reasons is terrorists utilizing the advantage of the lack of a foolproof security system. Traditional explosive detection systems are bulkier in size, expensive, and always require manual attention. Because of its public visibility intruder can easily bypass the system using another route. Our work is mainly based on explosive detection using wireless sensor networks.
Block diagram explanation :
Power supply unit:
This section needs two voltages viz., +12 V & +5 V, as working voltages. Hence specially designed power supply is constructed to get regulated power supplies.
Zigbee technology:
ZigBee is the name of a specification for a suite of high-level communication protocols using small, low-power digital radios based on the IEEE 802.15.4 standard for wireless personal area networks (WPANs).
- A very low-cost, low power consumption two-way, wireless communication standard for automation, toys & PC peripherals.
- Low power consumption: 6 months to 5 years battery life for most applications.
- Low cost: At least half the cost of Bluetooth solutions.
- The high density of nodes per network: 250 nodes per network, multiple co-located networks.Data rate requirements: Few bits to 250kbps sufficient.
ARM processor:
ARM is a computer processor-based RISC architecture. A RISC-based computer design approach means ARM processors require significantly fewer transistors than typical processors in average computers. This approach reduces costs, heat, and power use. The low power consumption of ARM processors has made them very popular:
The ARM architecture (32-bit) is the most widely used in mobile devices, and the most popular 32-bit one in embedded systems.
ARM processor features include:
- Load/store architecture.
- An orthogonal instruction set.
- Mostly single-cycle execution.
- A 16×32-bit register
- Enhanced power-saving design.
Buffers:
Buffers do not affect the logical state of a digital signal (i.e. a logic 1 input results in a logic 1 output whereas logic 0 input results in a logic 0 output). Buffers are normally used to provide extra current drive at the output but can also be used to regularize the logic present at an interface.
Drivers:
This section is used to drive the relay where the output is the complement of input which is applied to the drive but the current will be amplified.
Relays:
It is an electromagnetic device that is used to drive the load connected across the relay and the o/p of the relay can be connected to the controller or load for further processing.
Metal detector:
A metal detector is an electronic instrument that detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe that can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones, or a needle moving on an indicator. Usually, the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes. Another common type is stationary “walk-through” metal detectors used for security screening at access points in prisons, courthouses, and airports to detect concealed metal weapons on a person’s body.
Methodology:
The transmitter will have the Metal Detector, when the metal is detected it gives the signal to the ARM, then the ARM will send the information to another receiving station through ZIGBEE which is in a Police station or security office. At the same time, ARM will generate the output that is fed to buffer IC 4050, buffer stores and given to the driver IC 2003 in driver current will amplify and voltage will invert with the help of the Darlington circuit of driver IC to drive the relay. Then the signal is given to the output load for indication purposes.
When ARM receives the data from the Zigbee, it will enable the alert through the Buzzer on the receiver side.
Advantages:
- More useful in remote areas.
- Firing events more help full to save.
- This project we can operate Easily
Disadvantages:
It increases the cost whereas digital systems reduce the cost of the system.
Applications:
- This project can be implemented in Military applications.
- This project can also use for Landmine detection.
- This project can be used in Firing situations.
