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The NXP Hexiwear Child Seat Sensor device will be a
user friendly device that can be used to monitor the
presence of a child inside a vehicle. The device will
use to its advantage the constraint of limited
Bluetooth range as a proximity sensor and switches
placed in the seat to detect pressure on the seat.
When the driver or parent/guardian’s device
connected to the Bluetooth happens to be out of
range and the last report sent to the device is that
pressure was detected in the seat, the driver’s
device will receive an alert saying that a child has
been left unattended in the car seat.
• The user will interface with the system through
two methods; the Mobile Application & Seat
Sensor
• The hardware interfaces include the seat sensor
and the seat sensor module
• The software interfaces will consist of the mobile
application communicating with the Hexiwear
Module
Adam Banuelos, Tristian Blocker, Katerina Goldstein, Kenneth ShirleyGregory Camuzat, NXP Sponsor Dr. William Stapleton, Faculty Advisor
Four BlueTooth 4.0 (BLE) seat modules can be paired
with a mobile device concurrently in normal usage
conditions. Because the system will not need to
differentiate between which seats are occupied,
occupying any paired seat sensor will be enough to
keep they system on alert for an unattended child
condition.
• Hardware Platform: Hexiwear
• Compatible with Kinetis Design Studio
• Programming Platform: MBED OS
• Mobile Application: Customized Wolksense
Application
• GPS coordinates to locate vehicle as an additional
safety feature
• 3-D print a container for the seat module
• Seat Sensor that activates system when weight is
present
• Visual and Auditory notification that the system is
active
• Confirmation of connection to user’s phone
• Notification system via phone application
• Secondary notification system via phone
application
Research completed for Hexiwear components
• Hexiwear
• Hexiwear Power Supply
• Switches
Research completed for Mobile application
• Simultaneous Bluetooth connections possible
• Tools necessary for programming mobile
application
• Bluetooth connection range
• Assemble Hardware
• Write Code for Seat Module
• Write Code for Phone Application
• Test Code
• Test System
• Stretch Goals
• Senior Design Instructors: Dr. Cecil Compeau, Lee
Hinkle
• Faculty Advisor: Dr. William Stapleton
• NXP Sponsors: Dr. Kevin Kemp, Gregory Camuzat
• Senior Design II Mentors: Jedidiah Harrah, David
Mejia, Sammy Solis
• Administrative Assistant: Sarah Rivas
Administrator will install mobile application and is
responsible for the initial Bluetooth paring of
mobile device and seat module
In the event that the driver is unresponsive to the
initial alerts, an emergency contact is required to
ensure the safety of the child. The main
administrator will have the ability to edit
emergency notification contact information
• False Alert: User will have five minutes to
respond before the secondary contact is notified
• Child was removed from car seat but system did
not receive signal from mobile: System will shut
off automatically after five minutes to conserve
power
Adam Banuelos Tristian Blocker
Katerina Goldstein Kenneth Shirley
Hardware Performance Parameters
ParameterTest
ConditionsMin Max Units How Tested
Buzzer Vs = 5.0 V 3 5 V Apply voltage and confirm audio output
HexiwearDocking Station
Vs = 0 3.3 5 VMeasure with voltmeter over the supply
range
LEDVs = 3.3 VIs = 20 mA
20 50 mA Apply voltage and confirm polarity direction
Push Button
Continuity 0 ∞ ΩMeasure continuity with multimeter while
depressing
Software Performance Parameters
Function Description How Tested
User
Emergency
Information
The user will be able to input
emergency contact information
and the device will notify the
contact in the time of an
unresponsive driver.
Ensure that the correct
emergency contact is
notified when there is
pressure applied on
the tactile switch and
the driver is out of
Bluetooth range
Bluetooth
Connection
The Bluetooth’s operation range
is 100 meters. When the driver is
out of Bluetooth range and a child
has been detected in the seat, the
emergency contact is notified.
Move the device
connected via
Bluetooth at various
distances
Hexiwear
Application
Loads in 30 seconds or less Use a stopwatch to time
bootup duration
Platforms
The system will run using the
Hexiwear development
platform and an Android
compatible mobile application
Test all functions listed
above
Features Performance Target
Standard Buzzer Confirmation Sound
Hexiwear Docking Station Connectivity
LED Visual Verification
Push Button Weight Sensor
Hexiwear Development Platform