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The Smart/Safe Car SeatSENIOR DESIGN II
FINAL PRESENTATION
Andrew Evans (EE)Team Leader
Hardware/Coding for Microcontroller
Le’Quala Jackson (CPE)Bluetooth Module/Cell Phone Application/Website Design
Sam Stockstill (EE)Hardware/ Coding for
Microcontroller/ Bluetooth Module
Kyle Willis (EE)Hardware/ Coding for Microcontroller
Advisor:Dr. Raymond Winton
Our Team
Outline
Problem
Solution
Constraints Technical
Practical
Testing
Final Design
Questions
Problem
Extreme temperatures are reached in minutes inside vehicles when turned off
Caregivers getting out of daily routine and/or in an extreme hurry
The available electronic technology is not being utilized
Solution
Device works without the caregiver having to do anything out of the ordinary
Multiple sensors and Bluetooth module
Multiple catch safes in case one system fails or goes unnoticed during use
Technical Constraints
Name Description
Temperature Device must be able to detect temperatures between 0oF and 120oF.
Pressure Sensor Device must be able to detect a weight of at least 5lbs. [2]
LED and Alarm Device’s LED and alarm alerts must be distinguishable from other alerts.
Battery Device will be powered by vehicle’s battery.
Communication Compatibility
Device must be compatible with Android OS. The device must also be able to connect to the caregiver’s cell phone through Bluetooth.
Practical Constraints
Type Name Description
Sustainability Durability
The device must be able to withstand motion and vibration of the vehicle, coming in contact with moisture, and a vast range of temperatures.
Health and Safety
Safety This design aims to prevent deaths by helping reduce the problem of caregivers forgetting their children in vehicles unattended.
Sustainability
The device must be able to work under many types of conditions:
Moisture
Vibrations and movement from vehicle
Extreme temperatures
Health and Safety
Documented cases of children dying of heatstroke in United States directly related to being left in vehicles:
2013: 43 [1]
1998 – Present: 605 [1]
Progress from Design I
Bluetooth Module Bluetooth Mate Silver
Rn-42 compatible with all PICs
Made by same company as PIC33
Overall Test Plan
Test PCB in lab Made sure all signals were correct compared to
bread board testing
Test PCB in Vehicle
Lab Testing
Test PCB with 12V buzzer and 12V source
Test Bluetooth connection through variety of conditions
Test LEDs in multiple outside lighting conditions How many LEDs and which
type works best?
Testing
Voltage divider going into Acc power supply:
Testing
Voltage divider going into lock motors:
Vehicle Testing
Test signals from vehicle
Test LED location (best visibility)
Pressure sensor placement
Heat test inside vehicle
Battery life
Test breaking point for the device
Full vehicle test
LED Alarm
10mm Ultra bright
5mm Red LED
5mm Green LED
5mm Wide-Angle Red LED
LED Voltage (V) Current (mA)
10 mm Ultra Bright 2.62 3.56
5mm Red 1.64 3.56
5mm Green 1.9 3.56
5mm Wide-Angle Red 1.66 3.56
Pressure Sensor
Tested different positions of pressure sensor in car seat with constant weigh of 5lbs Found most effective area
relevant to:
Voltage
Consistency
Re-tested with multiple pressure sensors and compared results
Bluetooth Testing Hallway Testing
Parking Lot Testing
15 meters walking distance before Power Alert
Clear communication at 20 meters with obstacles
Clear Communication at 40 meters without obstacles
PCB Schematic
BluetoothModule
TemperatureSensor
PIC33
VoltageRegulators
Heatsink
BJT
LAYOUT OF PCB
PressureSensor
Voltage Reg.& Heatsinks
Temp.Sensor
BluetoothModule
PIC33
MOSFET
BBJT
BOARD SIZE
• Dimensions of Board: 4.5”x 3.25”• Dimensions of Nokia Lumia 820: 4.8”x 2.80”
PACKAGING
Protective Casing
•Simcobox.com•Sparkfun.com•Radioshack.com
•Mouser.com – CU-3244-MB - $6.80
Final Product and Costs
dsPIC33EP $ 2.84
Bluetooth mate Silver $ 39.99
Temperature Sensor $ 0.35
Pressure Sensor $ 6.36
Ultra bright LED $ 1.20
12V Voltage Regulator $ 0.22
3.3V Voltage Regulator $ 0.69
MJE3055T $ 0.29
Box (packaging) $ 6.80 Misc. Passive Components $ 1.50
Total $60.24
The Smart/Safe Car SeatSENIOR DESIGN II
FINAL PRESENTATION