Done by Inventors group from Alkhor Secondary School for girls . Under supervision of AL-Bairaq

1. AL-Bairaq
I am Discovering Materials
smart sensors
Inventors group
Sara ahmed almohannadi thajba mohammed alhail
Sherifa ahmed almohannadi najla hassan almohannadi

2. • Introduction
• Activity 1: evading motion detection.
• Activity 2: taking a tour of some sensors.
• Activity 3: making a microphone.
• Activity 4: exploring the piezo effect: the inside
story.
• Activity 5: measuring piezoelectric or
pyroelectric response.
• Design Project : Designing a coin counter
• Product idea: Smart food court

3. Introduction
Sensor is a device that detects and responds to the type of
input from the physical environment. Specific inputs can be
light, heat, motion, humidity, pressure, or any one of a large
number of other environmental phenomena.

4. (A): trying to evade a motion detector sensor procedure:
we tried evading the motion sensor by:
1-we tried to walk really slow
2- we tried to walk really fast
*Result:
1-range reach up to 30 feet
2- range area in 80 degree in conical shape
(B): We passed 3 different objects in front of the motion detector :
1-The first one a moving trolly + ice
2-The second one is a moving trolly + boiling water
3-The third one is moving trolly only
*Result:
1-the motion detected the ice and boiling water because it feels the change in
infrared radiation.
Activity 1 :
Evading motion detection

5. Sensor Stimulus Response
Music Card Opening the card Sound
Moving flower Clap The flower
movement
Talking ben Sound Sound
Sound birds Sound and
touch
Sound
- We explored some types of smart sensors and concluded the following :
Activity 2
Taking a Tour of Some Sensors
Conclusion: after exploring many sensors, we realized that each
smart sensor has a different stimulus and different response
depending on its purpose.

6. we made a microphone to know how the PVDF work. We
used flexible PVDF and rigid PVDF
Activity3:
Making a microphone
Result :
more
more

7. Activity4:
Exploring the piezo effect- procedure :
Recognize the structure of polymer.
The smallest monomer in the PVDF is ”
C2F2H2 “:
Part A: building the
PVDF monomer:
We used the molecular
modal kits to build the
monomer C2F2H2
(difluoroethylene) which Is
the building monomer of
the PVDF
Part B:building the
PVDF polymer:
then we build the PVDF
polymer (polyvinylidene
fluoride) of the repeating
units
Of C2F2H2
Part C: seeing the structure at work
-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

8. Activity 5:
measuring piezoelectric or Pyro electricity response
Conclusion : the bigger ball
was the bigger voltage
Procedure: we dropped an iron ball on the PVDF and we got the voltage
Fixed mass (big ball) and different hight
Averag
e
voltage
V3V2V1Height
-0.97-0.42-0.31-0.5210 cm
-0.416-0.42-0.45-0.385 cm
Fixed the height (10 cm) and different hight
Average
voltage
v3v2v1weig
ht
-0.426-0.31-0.45-0.52Large
6.60.200.09-0.27Medi
um
0.1980.280.170.13small
Part A: we used different sizes
of balls to test the
piezoelectricity of the PVDF.
Result:
Part B: we used a hair dryer to test
the pyro electricity of the PVDF

9. Design Project :
Designing a coin counter
V1 V2 V3 AVERAGE
VOLTAGE M
Coin 1
Mass=
11
0.44 0.29 0.15 0.5
Coin2
Mass=5
0.43 0.36 0.22 0.3
Coin3
Mass=2
0.15 0.10 0.11 0.1
*Procedure:
Conclusion: The more mass more
voltage.
0
0.2
0.4
0.6
coin1
mass=2
coin 2
mass=5
coin3
mass=11
Average
average
voltage
Unknown
Mass
Voltage
6.45 g0.3
We tried to find out the mass of an unknown coin
from it’s voltage and it worked.
• In this activity we
dropped three coins
over the PVDF from
the same height for
three times to get
the average voltage.
• We weighted the
coins.

10. • Introduction :
• The real problem which we face in our society is
the crowdedness we find in some popular places
like the food courts especially in colleges and
malls.
• No organization had discussed this problem
before , that’s why there are no solutions or
planning concerning this issue.
• As a way of achieving Qatar’s vision 2030 , we
decided to adopt this idea by using technology to
overcome this problem .
• We thought of making food courts in Qatar smart
by using different sensors.
(smart food courts)

11. Hypothesis
We assumed that if smart food courts are
applied in Qatar, it will facilitate clients life.

12. Smart Food courts
Methods and Materials
We will add pressure
sensors on chairs to sense
people sitting on them,
when people leaves their
places. The following will
happen:
1. The light will turn to green if
people are sitting)
2. Sends a message on the
screen in the workers room to
notify them about the empty
table number in order to
clean it.
In addition smart bins will be in the smart
food courts, it be opened only by hand
motion using a motion sensor
for hygiene purposes, also it will notify the
workers when its full by using an ultrasonic
sensor that detects the level of trash.

13. Smart food courtBenefits
Applying the system of
smart food courts will
facilitate visitors/ clients
movement in the area.
Assures customers
hygiene by using the
smart bins.
Facilitate the work of
cleaners.
Provide a civilized
developed lifestyle in
Qatar.
1
2
3
4

14. Smart food courts
• We recommend to apply our project in all food courts available in Qatar
malls and universities.
*Recommendations:

15. Conclusions :
We are so proud to be in
Albairaq , we learned how to
work in groups and learned
many skills like how to search
,present and express our selves
in a confident way

16. 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
Gasand Shell.