Finding

objects

Prepared by: Laial Al Jeans Mais Dabous Supervised by: A.Jammal Kharoshah

Introduction• For our execution to our graduation project in

this semester we tried to implement its idea successfully and achieving our purposes.

• Our project “Finding Objects” helps user by reducing the time and work for looking for his object such as " bags, keys, remotes, mobiles and jewelries etc…."

Project's Targets• We hope to execute successful project that

supports our knowledge and skills as :

1-having the ability of determining problems , solving them and replacing part by another .

2-Learning programming the pic

3- Thinking about points can be applied on our project to develop and support it.

• We want to work on a realistic idea that helps people solving a problem as one that we studied because we know that an engineer is a problem solver .

But How

Press three keys only

Press three keys only

Your object will

produce sound

directly

Your object will

produce sound

directly

Our project in block diagram : Hand’sdevise

ChannelObject’sdevise

Now we will see hall project’s datasheet

Channel

Pic 16F877Pic 16F877

Pic 16F877Pic 16F877

maxmax

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Press 2 buttons and ”*”

Private # to transferred to pic

The pic coded the #

Pic send the code to TX

TX antenna

Antenna RX

RX pic

Comparison operation in pic

Are two codes equal?

Channel

Buzzer willProduce sound

Nothing happened

Transmitting Stage:

Pic 16F877Pic 16F877

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In this stage the signal produced that represent pressed number is as shown here:

This represents # (2)

This represents # (1)This represents # (9)

•1- Keypad:

A keypad is a set of buttons arranged in a block which usually bear digits and other symbols but not a complete set of alphabetical letters. If it mostly contains numbers then it can also be called a numeric keypad.

2- Microcontroller (PIC): PIC is the IC which was developed to control devices, alleviating the load from the main CPU.

in our project we use the PIC (16F877) in both transmitting and receiving stages

3- Radio Transmitter :• In our project we use “Radio Transmitter Module” with

SAW Resonator and external antenna.

4-Voltage regulator:• A device or circuit that maintains a load voltage nearly

constant over a range of variations of input voltage and load current. Voltage regulators are used wherever the unregulated voltage would vary more than can be tolerated by the electrical equipment using that voltage .

5-Antenna:An antenna is a transducer designed to electromagnetic

waves receiver or transmitter . In other words, antennas convert electromagnetic waves into electrical currents and vice versa.

• Antennas are used in systems such as radio ,television broadcasting, wireless LAN, radar,……..etc.

• In our project we use this antenna in both stages

Receiving stage:

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Pic 16F877Pic 16F877

RXRX

• This represents # (2)

In this stage the received signals that represent pressed

number is as shown here:

This represents # (9) after sending and receiving before entering the pic

This picture represents the signal after arriving the antenna at receiving stage

2-Buzzer:

• It is a piece of the issuance of electronic sound when fed a particular effort, and can make the sound of the piece on a continuous basis and when fed a continuing effort, and can make the sound and sporadic efforts at feeding hesitant.

•

Effort fed by the piece comes from the reception after the code to verify the authenticity of the control of the Service Siren by the sound of the thing we're looking for.

During hardware design for the project some problems faced us and we summarised them as below :1-Type of pic we choose first wasn’t suitable ,so we convert it.

2-Unmatched between decoder and pic ,so we replace decoder by another pic.

3-Fail of wireless system for long distances between two circuits .

4-We build our system on a plate but without response and its photo appear below

Future look for our project:In our project these points can be applied to develop it: 

1-Try to accurate wireless design.

2-Entering idea of using LCD to support secure side for the project. 

Economic part:• The market needs this kind of device. This device if it’s

being applied will be widely used in air port, houses, companies and other places in order to find something needed quickly.

• In our project we built this system from cheap and simple component which were mentioned above, in order to

encourage people own it

 in general the total cost of our project was about $70.

Conclusion:• In this course we follow the steps one by one to build successful

design as we plane from the last semester.

• Although a lot of problems faced us but that made us have more and more knowledge about designing, dealing with tools, having an ability to discover reasons of problems and finally evaluating our work.

• We hope we can achieved that goals

Thank You