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The Smart/Safe Car SeatSENIOR DESIGN I
FINAL PRESENTATION
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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
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Outline
Problem
Solution
Flow Chart
Constraints Technical
Practical
Prototype Design
Testing
Questions
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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
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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
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Flow ChartPressure Sensor
Device Power On
Vehicle Off
LED Timer Starts
Timer StartsCar put in park
(locks unlocked)
Alarm Sounds
Timer Times Out
LED Flashes Alert Sent
to Phone
Dangerous Temperature
Detected
Car put in drive (locks
locked)
User locks car leaving
carTimer Times Out
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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.
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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.
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Sustainability
The device must be able to work under many types of conditions:
Moisture
Vibrations and movement from vehicle
Extreme temperatures
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Health and Safety
Documented cases of children dying of heatstroke in United States directly related to being left in vehicles:
2013: 42 [1]
1998 – Present: 604 [1]
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Prototype Design
• Our design consists of: Hardware
Pressure Sensor (Force Sensitive Resistor)
Temperature Sensor (LM60CIZ – Ambient Temperature Sensor)
Bluetooth Module (HC-05)
Voltage Divider/Voltage Regulator
dsPIC33EP128GP
Power (Car Battery)
Horn/Lock Mode
Software Cell Phone Application
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Testing on Breadboard
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Testing
Subsystem #1: Pressure Sensor
Weights placed on Sensor up to 20 lbs.
Voltage Readings taken
Voltage Reading notifies that a weight is present and Car Seat Turns On
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Testing
Subsystem #2: Temperature Sensor
Detects temperatures within dangerous ranges.
Tied to Bluetooth module
Once temperature reaches danger zone, alert is sent to caregiver’s cell phone.
LM60 Temp. (F)Thermometer Temp.
(F)% Error
21.2 20.3 4.43%
32.3 32.8 -1.52%
40.1 40.6 -1.23%
50.7 51.4 -1.36%
61.4 60.9 0.82%
70.8 70.3 0.71%
81.1 80.8 0.37%
92.1 92.4 -0.32%
100.8 101.2 -0.40%
111.3 111.9 -0.54%
120.6 121.2 -0.50%
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Testing
Subsystem #3:Alarm and LED
Alarm consists of the car horn blowing when pressure sensor is on and locks are pressed after driver has parked.
LED flashes 5 seconds after accessory power has turned off.
Accessory power turns off after 20 seconds of car being turned off.
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Testing
Subsystem #4: Communication Compatibility
Cell phone application
Bluetooth waits on accessory timer to expire to send alert to caregiver’s phone.
When temperature has reached dangerous temperature alert is sent to caregiver’s phone.
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Testing
Subsystem #5: Battery Life
Tied to battery of car
Life expectancy overall is based on the car battery
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Full System Test Mass placed in car seat,
Pressure Sensor detects weight and device comes out of sleep mode
Car is turned off and timer starts for Alarm LED
Lock check Temperature Sensor
constantly detects temperature. Alert sent to phone when reached dangerous temperatures.
Bluetooth connection checked. Alert sent to phone when accessory timer reaches 25 seconds
Pressure Sensor no longer detects mass - System turns off
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References
[1] J. Null. (10 July 2013). Heatstroke Deaths of Children in Vehicles [Online]. 1 October 2013. Ggweather.com. Available: http://www.ggweather.com/heat/
[2] (17 September 2013). Low Birthweight [Online]. www.lpch.org. Available: http://www.lpch.org/DiseaseHealthInfo/HealthLibrary/hrnewborn/lbw.html
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The Smart/Safe Car SeatSENIOR DESIGN I
MIDTERM PRESENTATION