Done by Aurum group at Al-Khor Secondary School for Girls. Under supervision from AL-Bairaq

1. AL-Bairaq
I am Discovering Materials
Smart Sensors
Sentry
AURUM
Fatma Mohamed Al-Mohannadi Reem Sultan Al-Humaidi
Rouda Ahmed Al-Humaidi Sheikha Salman Al-Mohannadi

2. Outline:
Activity 2: Taking a tour of some sensors
Activity 3: Making a microphone
Activity 1: Evading motion detection
• Introduction
Activity 4: Exploring the piezo effect the inside story
Activity 5: Measuring piezoelectric response or pyroelectric response.
Design Project: Designing a coin counter
Product idea: Smart school buses ((Sentry))

3. Introduction:
A sensor is a physical system that responds to a
type of stimulus by creating a useful response. A
sensor contains a special material that gives a
particular response to a particular stimulus.
Sensor
element
Processor
Output
DeviceStimulus
Response

4. Activities:
Activity2: taking a tour of some sensors
Activity3: making a microphone
Activity1:Evading motion detection
the motion detected our
moves but it didn't detect
the sponge because its not
a living thing and it
temperature was similar to
the lab’s temperature
in this experiment we explored many sensors, we
realized that each smart sensor has a different
stimulus and different response depending on its
purpose
we made a microphone using PVDF
films. We used flexible PVDF and rigid
PVDF , after testing them out that the
flexible PVDF is more sensitive

5. We used the molecular modal kits to
build the monomer C2F2H2
(difluoroethylene) which Is the building
monomer of the PVDF, then we built the
PVDF polymer (polyvinylidene
fluoride) of the repeating units
Of C2F2H2.
We dropped an iron ball ((different
sizes)) on the PVDF to test the
piezoelectricity of the PVDF. Also we
used a hair dryer to test the
pyroelectricity of the it.
• In this activity we dropped three coins
over the PVDF from the same height for
three times to get the average voltage.
Activity4: Exploring the piezo effect (the inside story)
Activity 5: Measuring piezoelectric response
Design Project : Designing a coin counter

7. • This project tackles one of
the society problems which
is ((children death on school
buses)), many children has
been forgotten on the bus
for hours
• One of the main
purposes to adopt
this idea is to save
children life
• The child that died that day he could
have been your child and the children
that are going to die in the future could
be your child thats why we need to take
care of this problem so the the parents
at home would not be scared
Sentry
Sentry

8. Why do we need Sentry?
Sentrysaveslives.
Sentry

9. Sentry
Hypothesis:
We assume that if Sentry is applied in Qatar, it will
prevent many tragedies, the fruit of this project truly
would be worth the investment. That is because
Sentry will notify the bus driver (or supervisor) if a
child is seated.

10. Sentry
Methods and Materials:
Materials:
-Motion detector (to
detect the child)
-light (to glow when
there is a child on the
chair)
-Electric circuit
-Battery
Methods:
The motion detector is going
to be above each chair and as
long as the motion detector
detects the child it is going to
glow so the driver would know
that there is a child in this
seat,and if the motion detector
is not detecting heat the light
will be off .

12. The Benefits of the Sentry:
The Sentry is able to decrease
the rate of children’s death in
school buses
Sentry do not need new buses with built in system
-Sentry will make the
driver’s job more
convenient
-its
Affordable

13. Results:
It will make school buses more safer for children
It will make the driver’s job more convenient
It is going to decrease the children’s death in school buses
It will assure the parents that their kids will go and come from school

14. Recommendation:
• We recommend to apply our project in all the school
buses(Karwa) in Qatar
• Sentry can be developed in many ways in the future ((we
can add a smart screen that is connected to a pressure
sensor))

15. Conclusions:
All in all, in our journey with albairaq we learned a lot of things about
smart sensors. Each activity taught us something about it. in activity 1
we discovered that the motion sensor only detect the living things. Also
we explored a lot of smart sensors that we are rounded by in activity 2.
Building a microphone in activity 3 was a great way to know and realise
the difference between the flexible and the rigid PVDF films, and there
is a lot of things that we discovered and learned about in this journey

16. Many thanks to our teachers, school and AL-Bairaq team
from the Centre for Advanced Materials (CAM), and Qatar
University for supporting us during our journey with Al-
Bairaq.
Also, we would like to thank the sponsors UNESCO, Qatar
National Commission.