Simple Metal Detector Circuit Diagram and Working

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Simple Metal Detector Circuit Diagram and Working
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Simple Metal Detector Circuit Diagram and Working
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 baggages of person
  carrying them with bad intentions such metal
  detectors are especially useful to detect the
  presence of hidden items within objects.

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Simple Metal Detector Circuit Diagram and Working
Metal Detector
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Simple Metal Detector Circuit Diagram and Working
Metal Detector

• 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.

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Simple Metal Detector Circuit Diagram 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.

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Simple Metal Detector Circuit Diagram and Working
Simple Metal Detector Circuit

• 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.

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Simple Metal Detector Circuit Diagram and Working
Simple Metal Detector Circuit
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Simple Metal Detector Circuit Diagram and Working
Simple Metal Detector Circuit

• 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.

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Simple Metal Detector Circuit Diagram and Working
Simple Metal Detector Circuit

• 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.

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Simple Metal Detector Circuit Diagram and Working
Simple Metal Detector Circuit

• 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.

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Simple Metal Detector Circuit Diagram and Working
A Simple Metal Detector Circuit Using IC 555
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Simple Metal Detector Circuit Diagram and Working
A Simple Metal Detector Circuit Using IC 555

• 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.

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Simple Metal Detector Circuit Diagram and Working
A Simple Metal Detector Circuit Using IC 555

• 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.

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Simple Metal Detector Circuit Diagram 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.

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Simple Metal Detector Circuit Diagram and Working
Metal Detector Robotic Vehicle Operated by
Android Application

• 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.

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Simple Metal Detector Circuit Diagram and Working
Metal Detector Robotic Vehicle Operated by
Android Application
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Simple Metal Detector Circuit Diagram and Working
Metal Detector Robotic Vehicle Operated by
Android Application

• 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.

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Simple Metal Detector Circuit Diagram and Working
Metal Detector Robotic Vehicle Operated by
Android Application

• 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.

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Simple Metal Detector Circuit Diagram 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.

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Simple Metal Detector Circuit Diagram and Working
Metal Detector Robotic Vehicle using RF Technology

• A metal detector circuit is placed in the robots
  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.

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