Mid-Semester Presentation Senior Design I February 24, 2011

Dr. Raymond Winton Academic adviser Blake Bennett EE Programming Technical Documentation Ayman Busaad EE Hardware Implementation Hardware Design Chris Howell EE Hardware Development Technical Documentation Kenneth Gustine EE Programming Website design

Problem Solution Block Diagram Constraints -Technical -Practical Trade-off Progress Timeline Questions

The interior temperature of a car can rise by 20°F within only ten minutes which can cause a child death due to hyperthermia. [1] Before airbags, 1990 – 1992: 11 deaths due to hyperthermia [1] After airbags, 2006 – 2009: 108 deaths due to hyperthermia [1]

Combined a device with a car child seat which can determines when a child is in danger due to extreme temperatures and alerts help if a situation becomes hazardous. The device can alert via text messaging (SMS) to a number that is programmed into the device.

NameDescription CompatibilityDevice must be compatible with standard cellular networks. Weight Sensing Device must be capable of detecting the presence of a child weighing at least five pounds in a safety seat. Temperature Sensing Device must measure ambient temperatures from 30° to 100° Fahrenheit. Temperature OperationDevice must operate from 0° to 180° Fahrenheit. Battery Life Device must have a minimum battery life of three months under normal operating conditions.

TypeNameDescription SustainabilityMaintainability Battery replacement or recharging must be a convenient, intuitive process. ManufacturabilityPersonalization Device must be programmable with multiple user phone numbers.

Battery replacement or recharging must be a convenient, intuitive process

Device must be programmable with multiple user phone numbers.

Service Network Price Setup Providers Coverage Storage GSM Lowest Easy Many Plentiful SIM card CDMA Medium Complex Many Plentiful None

ManufacturerModelAdvantagesDisadvantages TelitGC864PYTHON, ADC/DAC, PriceNo breakout board No antenna connector SiemensGSM/GPRS modem MD720-3 Everything set upVery Expensive TelitGE865-QUADPYTHON, antenna connector, ADC/DAC, Price, breakout board No on board SIM TelitGM862-QUADPYTHON, GPS, on board SIM and antenna connector Very Expensive

Force Sensitive Resistor Advantage: Can be easily integrated into child seat Disadvantage: Analog signal transmitted to system Snap-action Pushbutton Switch Advantage: Binary signal transmitted to system Disadvantage: Maybe difficult to integrate into car seat

OptionsAdvantageDisadvantage AA batteriesEase of replacement Low initial cost Ongoing battery cost Battery PackLow maintenance cost Manufacturer controls battery type Higher initial cost Charging inconvenience Vehicle Power SupplyNo batteries Smaller device Inconvenient to user External wires Power stops with removal of keys

OptionsDisadvantagesAdvantages DigitalHigher power consumption Easy to Sample More Accurate Output less susceptible to Noise Analog Less Accurate Noise susceptibility Lower power consumption Precision only dependent on microcontroller’s ADC

GSM module : Telit GE865 Received, on board Temp sensor: LM60 Received, on board Antenna: Received, on board SIM card holder: Received, on board Pressure sensor: Researching Power Supply: Researching

Time lineJanuaryFebuaryMarchApril Research Hardware Testing Programming Prototype Testing Optimizing

[1] J. Null. (2011, January 17) Hyperthermia Deaths of Children in Vehicles. [Online]. Available: