Transcript Finding_objects

Finding
objects
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 .
Press three
keys only
Your object
will produce
sound
directly
Our project in block diagram :
Hand’s
devise
Channel
Object’s
devise
Now we will see hall project’s datasheet
max
Pic 16F877
Channel
max
Pic 16F877
Press 2 buttons
and ”*”
Antenna
Private # to
transferred to pic
RX
Channel
The pic
coded the #
Pic send the
code to TX
TX
antenna
yes
Buzzer will
Produce
sound
RX
pic
Comparison
operation in pic
Are two
codes
equal?
No
Nothing
happened
Transmitting Stage:
max
Pic 16F877
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:
RX
max
Pic 16F877
In this stage the received signals that represent pressed
number is as shown here
• This represents #
(2)
:
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