Simple Metal Detector Circuit Diagram and Working

Simple Metal Detector Circuit
Diagram and Working

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Introduction
 To prevent any unlawful entry of guns and bombs in public places, a security
system is developed by designing various electronics projects by using a
proximity sensor. So, a metal detector is used to sense any existing metal
which is nearby. A Metal detector is an electronic device which is used in
many places like theatres, shopping malls, hotels, etc., to detect any metallic
objects like knives, guns or any other explosives kept hidden within the
baggage’s of person carrying them with bad intentions; such metal detectors
are especially useful to detect the presence of hidden items within objects.
Simple Metal Detector Circuit Diagram
and Working

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and Working
Metal Detector

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and Working
 The first industrial metal detector was developed in the year 1960
 A metal detector is an electronic device.
 An oscillator which produces AC current that passes through a coil producing
an alternating magnetic field.
 A part of the metal is near to the coil, eddy current will be induced in the metal
 This produces a magnetic field of its own.
Metal Detector

and Working
Metal Detector
 If another coil is used to measure the magnetic field.
 The change in the magnetic field due to the metallic object can be detected.
 The metal detectors are used to detect the weapons like guns, knives in the
airports.
 It is used in the construction industry to detect steel reinforcing bars in
wires, concrete, pipes buried in floors and walls.

and Working
 The main components a simple metal detector circuit are LC circuit,
proximity sensor and the buzzer.
 The LC circuit is nothing but inductor and capacitor, which are connected in
parallel.
 The LC circuit activates the proximity sensor when it senses any metal close
to it.
 This sensor glow the LED and makes a buzzer.

and Working

and Working
 When the LC circuit has any resonating frequency from any metal which is
close to it
 The electric field will be created, that will lead to induce current in the coil.
 The change the signal in the flow of the signal through the coil.
 A Variable resistor is used to change the value of the sensor, which is equal
to the LC circuit.

and Working
 When the metal is detected, the circuit will have changed signal.
 This changed signal will be given to the proximity detector.
 It will detect the change in the signal and react accordingly.
 When the metal is detected by the coil, the o/p of the sensor will be of 1mA.

and Working
 When the coil is near to the metal, then the o/p of the sensor will be
around 10mA.
 When the o/p pin is high, the R3 resistor will provide positive voltage to
transistor the Q1 to turn ON the LED.
 It will glow and generate a buzzing sound. Here, R2 resistor is used to limit
the current flow.

and Working
A Simple Metal Detector Circuit Using IC 555

and Working
 A simple metal detector circuit diagram project is designed using IC 555
 Metal detector circuit using 555 timer detect the metals and magnets.
 When a magnet is near to the 10mH choke, the o/p frequency changes.
 This circuit can be powered from a power supply.

and Working
 Which can provide an o/p DC voltage between 6V to 12V.
 If a metal is near to the coil L1, it produces a change of o/p oscillation
frequency.
 Then it generate a buzzing sound.

and Working
Metal Detector Robotic Vehicle Operated by Android Application
 The main intention of this project is to design a robotic vehicle which can
detect metals ahead of it on its path.
 This robotic vehicle is controlled by an android application
 This metal detector circuit using an 8051 microcontroller
 It is interfaced to the control unit, that generates an alarm to the user when a
metal is near to it.

and Working
 An 8051 microcontroller is used for the desired operation.
 At the transmitter side, an Android application is used to send commands to
the receiver.
 The robot moves forward, backward, right or left.
 At the receiving end, two motors are interfaced to the 8051 microcontroller for
the movement of the vehicle.

and Working

and Working
 The android application acts as a remote while the receiver end Bluetooth
device is fed to the microcontroller.
 This drive DC motors through motor driver IC for desired operation.
 A metal detector circuit is placed in the robot.

and Working
 The operations of the robot are carried out automatically if it detects any
metal underneath.
 As soon as the robot detects a metal, it generates an alarm sound.
 Fixing a wireless camera to the robot, So that the operator can control the
robotic movement remotely by watching it on a screen.

and Working
Metal Detector Robotic Vehicle using RF Technology
 The main aim of this project is to design a robotic vehicle that can sense
metals ahead of it on its path and this robot is controlled by a remote using
RF technology.

and Working
 A metal detector circuit is placed in the robot’s body.
 The operations of the robot are carried out if it senses any metal underneath.
 As soon as the robot senses this metal, it generates an alarm sound.
 This is to alert the operator of a possible metal ahead on its path.
 You can mount a wireless camera on the robot so that the operator can control
the movement of the robot remotely by watching it on a screen.
Metal Detector Robotic Vehicle using RF Technology

Simple Metal Detector Circuit Diagram and Working

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