Metal Metal DetectorDetector

PROJECT SUPERVISOR: SIR SHFEEQ

PROJECT MEMBER: FAIZA MUSHTAQ ALEENA ZAFAR SAHAR KHALID

 

Table of contentTable of contentObjective PrincipalDivision of modulesBlock diagramWorkingCircuit diagramDesign verificationPros and consApplication Conclusion

OBJECTIVEOBJECTIVE

The main object of this project is to:

To facilitate human being to detect metal.

To evolve an ideal application of MCU.

PRINCIPLEPRINCIPLE

The basic principle depends upon "Electromagnetic induction". It

works on the principle of changing of magnetic field due to

the passing of metallic object near to it.

DIVISION OF MODULESDIVISION OF MODULESMetal detector Microcontroller Moving vehicle

Metal Detector PartsMetal Detector Parts

oscillator Inductor Capacitor

Pic 16f688 output DISPLAY through LEDs

Block Diagram:Block Diagram:

Working:Working:In this project we use watch dog

timer(WDT) module of 16f 688 .the project is based on two

oscillators Internal oscillatorExternal oscillatorInternal oscillator is of fixed

value and the external is variable.

Cont....Cont....The external oscillator is made by

an inductor air filled coil and capacitors .

Due to internal oscillator WDT after 1ms.

In start the first value of external oscillator is store as calibrated value .

Cont...Cont...After 1ms MCU compare the new

value of oscillator with stored value.

if there is metal near the inductor, the value of the external oscillator will change.

We make decision on this comparison.

the change in oscillator is indicated by two LED.

Cont...Cont...If there is metal near the coil

value of the oscillator change. If it is greater then 2nd LED glow.if its value is less then 1st LED

glow.If there is no metal no led glow.

Circuit Diagram:Circuit Diagram:

Hard Ware Hard Ware

Design VerificationDesign Verification to verify our design we check it

on digital oscilloscope on which the change in output easily verify.

Vss=5v Vamp freq

Before metal 1.42v 1.04Mhz

Metal presence 1.42v 1.08Mhz

Pros And Cons.Pros And Cons.Low costSmall sizeeasy to usePortableBut not good interface with

vehicle Difficult to produce software

simulation.

Application 0f Metal Application 0f Metal DetectorsDetectors

Security purpose: ArcheologyCivil EngineeringIndustrial Metal Detector

Disadvantages Of Metal Disadvantages Of Metal DetectorDetectorThey may sometimes give a false

alarm if someone is carrying even harmless metallic objects or say gold jewelry /coins as a personal belonging,

They may interfere with magnetic recording media like cassettes and CDs

Conclusion:Conclusion:

The presence of metal change the oscillation of oscillator indicated by LED.