Phillip Byers Jonathan Mulvaine Josh Schortgen Michael Broski TEAM BOAR

1.An ability measure internal temperature of two separate points in the meat and the temperature inside the roaster using RTD sensors. 2.An ability to control the temperature inside the cooker by modifying gas flow using a logic controlled valve. 3.An ability store and load cooking profiles from memory. 4.An ability to automatically ignite at the push of a button and detect whether a flame is present. 5.An ability to wirelessly communicate temperature information to a remote display device. PSSC’S

 Component choices:  Micro  Most complicated  3V power MOSFET  High heat  5V power MOSFET  High heat  XBEE  Complex, RF, 50mA  Relay  Physical wear RELIABILITY AND SAFETY COMPONENT CHOICES FOR ANALYSIS

 PLL and oscillator circuits included  Includes all pin failures MICROPROCESSOR BLOCK

 Includes both 3V and 5V MOSFETs  Includes passive components  Includes transformer (not shown)  (ignore orientation of 5V reg) POWER SUPPLY BLOCK

 Includes some port pin signals  Includes MOSFET  Includes relay  Includes resistors GAS REGULATION BLOCK

FMECA failurefailure modepossible causefailure effectsmethod of detectioncriticality gas supply gas open when not commanded solenoid open and valve not closing (pin controlled) processor, mosfet, relay, motor, solenoid failure burner stays burning, burns at maximum or gas is released unburnt User detects smell or observes high temperature or remote alerts userhigh gas closed when not commanded solenoid closed or valve closed processor, mosfet, relay, motor, solenoid failure or no supplied gas or loss of 120VACno heat produced normal use interrupted or remote alerts userlow display screen malfunction screen blank, dark, garbled, or static contrast not set, failure of micro, digital POTS, cable, or powerunit rendered inoperableobservationlow temperature measurement sensor input out of range or inaccurate input signal out of range, low, or high resistor, RTD, capacitor, ATD, or SPI failure one of 3 sensors useless, registered temperature low/high calibration proceedure or meaningless temperature observedlow sensor input out of range or inaccurate input signal out of range, low, or high resistor, thermistor, or port failure gas may stay on in absence of flame, grill may not light grill automatically closes gas after ignition, smellhigh

 Why some component was not chosen?  Our ideas for safer failure? QUESTIONS?