The document outlines an activity plan for exploring various sensors and the piezoelectric effect. It includes 5 main activities: 1) evading a motion detector, 2) exploring smart sensors, 3) making a microphone, 4) exploring the piezoelectric effect through building a PVDF polymer, and 5) measuring piezoelectric and pyroelectric responses. It also describes a design project to build a coin counter using the piezoelectric properties of PVDF film.

1. AL-Bairaq
I am Discovering Material
Smart Sensor
Techno
Jawaher Ahmad
Ghalya Ali
Sara Mohammed

2. Outline
•Activity 1: Evading motion detector
•Activity 2: taking a tour of some sensors
•Activity 3: making a microphone
• Activity 4 : exploring the piezo effect: the inside story
– part A : building the PVDF monomer
– Part B : building the PVDF polymer
– Part c : seeing the structure at work
• Activity 5 : measuring piezoelectric or pyroelectric response
– Part A : measuring the piezoelectric response
– Part B : measuring the pyroelectric response
• Design project : designing a coin counter

3. Introduction
• In this module our subject is about
sensors, polymers and monomer, and how
could the sensor detect stimuli in internal
and external surrounding.
• Sensors : a device that detects or
measures a physical property and records,
indicates, or otherwise responds to it.

4. Evading motion detection (1)
• How does evading motion
detector work ?
• After trying to evade the motion
detector, we noticed that the
range of detection is a cone
shape and at a distance of
approximately 30 feet
• Also we found out that stimulus
is the change in infrared
radiation

5. Testing smart sensors (2)
object picture stimuli response
Dog pressure + sound sound
Bird sound + pressure sound + movement
Flower sound sound
Book Pressure sound
Frog pressure sound
After exploring many smart sensors, we realized that each smart sensor has a different
stimulus and a different response depending on its purpose

6. Making a microphone (3)
• The flexible film respond better
than the rigid film in the range
of frequencies reproduced.
• Both films respond better to
scratching and flicking than
talking and blowing.
• When we added a substrate
we noticed the difference on
talking because it was
enhanced by the larger surface
area of the substrate

7. Building the PVDF monomer(4a)
• We used the molecular mold kits to build
the monomer C2F2H2 (difluoroethylene)
which is the building monomer of the
PVDF

8. Building the PVDF polymer(4b)
• Then we build the PVDF polymer
(Polyvinylidene fluoride ) of the reapting
units of C2F2H2.

9. Seeing the structure at work(4c)
• When bending the film we noticed that
bending in one direction produces a
positive voltage and a bend in the opposite
direction produces a negative voltage .
• The faster the bending the larger the
potential.

10. Exploring the Piezo effect (5a)
•As the mass of the ball increases because the
pressure applied to the PVDF is higher. (we fixed the
height and we used different masses)
•The greater the drop, the greater the pressure which
results in high voltage.( we fixed the mass and we
dropped the ball from different heights)
•Using a substrate will give a higher voltage than the
free film because the substrate will cause more
vibrations to the film. ( we fixed the mass and height
and dropped the ball over the free film and over the
film with substrate.
size average
small -0.043
medium -0.0563
large -0.149
Size (large) average
Substrate 0.42
Without substrate -0.42

11. Measuring the pyroelectric response
(5b)
• We noticed how heat can cause the PVDF
film to produce voltage.

12. Design project (Designing a coin
counter )
• We used the piezoelectricity of the PVDF
to design a coin counter, by dropping
different coins with different masses and
realized that every mass gives a different
voltage. We tried to find out the mass of
unknown coin from its voltage and it
worked.

13. AUTOMATIC WHEELCHAIR TRANSFER
Introduction
• Our project is based on our knowledge about
sensors, which are devices that detects or
measures a physical property and records,
indicates, or otherwise responds to it.
• Our first concern in this project is to help
most of the wheelchair users visiting the
stadiums, therefore we devolped our idea
using a large number of sensors for the
project to work efficiently.

14. Tools
Survey of 100 wheelchair user
By looking on
this survey we
can easily point
out that 85% of
disabled
people find
spending time
on their
hobbies/
interest are so
crucial .

15. AUTOMATIC WHEELCHAIR TRANSFER
Our project
• Our idea is a an electronic platform were a
wheelchair would be attached to it, followed
by the user, then transfer the seat
automatically using the same entrance the
representatives would enter from, which
would make the movement easier, quicker
and safer for both the user and others.
• The platform itself contains built in mopping
and cleaning tools to clean the stadiums.

16. AUTOMATIC WHEELCHAIR TRANSFER
HOW IT WORKS ?
• As it transfer the passengers from the gate
to their seat , it also mops and brush the
stadium floors to give the stadiums a
neater and organized look. Every wheel is
attached to a separate electric motor so
that the platform would move easier and in
a smaller rotation with built in sensors and
Wi-Fi to make the product more suitable
for the user and stadiums needs.

17. AUTOMATIC WHEELCHAIR TRANSFER
BENIFITES
 Helps Qatar in 2022.
 Makes visiting stadiums for wheelchair
users easier and more enjoyable .
 Solves security and health issues .
 Makes the stadiums more organized and
controlled by the center.
 Cleans the stadiums.
 Makes stadiums less crowded.
 Less workers needed to run the stadium.

18. AUTOMATIC WHEELCHAIR TRANSFER
MATERIALS
MATERIALS
 Plastic
 Rechargeable
battery pack
 Electric motor
 Infrared beam
SENSORS
 Optical sensor
 Touch sensor
 Wi-Fi –
connectivity
 Self-contained
brush
mechanism
 Photocell
sensor

19. Automatic wheelchair transfer
Conclusions
Our project simply helps the disabled people to enter the
stadium easily and give them the opportunity to witness
huge events causing more disabled people to come to the
stadiums in addition to that it would make it safer for
disabled people to move in the stadium a way that would
help Qatar prepare for 2022 as it would make the stadiums
more organized and safe for both disabled people and
others.
all thanks to Al-Bairaq for introducing us to the world of
sensors that we use in most of our technology’s therefore
we were able to develop our product to make it more
comfortable for the user.

20. Acknowledgment
 Many thanks to my teachers, school and AL-Bairaq team
from Center for Advanced Materials (CAM), Qatar
University for supporting us during our journey with a AL-
Bairaq.
 Also, I would like to thank the sponsors UNESCO, Qatar
National Commission, Ras Gas, Maersk and Shell.