1. Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers – RM&S Analysis–

2. “Reverse Geocache” Box Locked box that will only open after one or more pre- determined GPS locations have been visited Directs user to next location by GPS coordinates, compass heading, or text description displayed on LCD. Route stored on microSD card located inside the box, able to be reprogrammed by PC RFID “master key” to allow access to box without finishing puzzle Project Overview

3. An ability to obtain and decode global positioning data in order to verify if current location matches pre-determined desired location. An ability to utilize accelerometer and magnetometer data to determine a compass heading with tilt compensation. An ability to access and interpret files located on a microSD card. An ability to display information to the user via an LCD display. An ability to identify an RFID tag using an RFID reader. PSSCs

5. 5 Component Reliability Micro-controller GPS Power Supply

6. 6 Micro-Controller Parameter name DescriptionValueComments regarding choice of parameter value, especially if you had to make assumptions. C1Die complexity 0.2816 bit MOS πTπT Temperature coeff. 0.19 Digital MOS 40 C C2Package Failure Rate 0.032 64 Pins, Nonhermetic πEπE Environmental Factor4.0Ground Mobile πQπQ Quality Factor10Commercially Manufactured component πLπL Learning Factor1More than 2 years in production λPλP Part Failure Rate1.812Failures /10^6 hours MTTF62.9564658556867

7. 7 GPS Parameter name DescriptionValueComments regarding choice of parameter value, especially if you had to make assumptions. C1Die complexity 0.041000 to 3000 MOS gates πTπT Temperature coeff. 0.19 Digital MOS 40 C C2Package Failure Rate 0.013 28 Pins, Nonhermetic πEπE Environmental Factor4.0Ground Mobile πQπQ Quality Factor10Commercially Manufactured component πLπL Learning Factor1More than 2 years in production λPλP Part Failure Rate0.596Failures /10^6 hours MTTF191.404557265947

8. 8 Power Parameter name DescriptionValueComments regarding choice of parameter value, especially if you had to make assumptions. C1Die complexity 0.011 to 100 Linear MOS Gates πTπT Temperature coeff. 0.19 Digital MOS 40 C C2Package Failure Rate 0.0034 8 Pins, Nonhermetic πEπE Environmental Factor4.0Ground Mobile πQπQ Quality Factor10Commercially Manufactured component πLπL Learning Factor1More than 2 years in production λPλP Part Failure Rate0.155Failures /10^6 hours MTTF735.98139439035

9. 9 Criticality Definition High: Injury to the user Medium: Loss of product functionality Low: Inconvenience to the user

10. 10 Power Circuit Blocks

11. 11 FMECA: Power Circuits IdentifierFailure ModeFailure EffectsMethod of DetectionCriticaliltyRemarks Battery ChargingA1.1DC Vin < 3.7 VCharge Current drops below 50mA, the Battery will not be charged. ObservationLOW A1.2DC Vin > 7 VIncrease in heat in the device, Charge current will decrease LED on CHG_L pin will turn on LOW A1.3USB Vin < 3.7 VCharge Current drops below 50mA, the Battery will not be charged. ObservationLOW A1.4USB Vin > 6 VIncrease in heat in the device, Charge current will decrease LED on CHG_L pin will turn on LOW A1.5C18-C20 shortLoss of Battery Charging AbilityObservationLOW A1.6C18-C20 openLoss of Decoupling CapsObservationLOW Battery ManagementA2.1R21, R23, R24, Open Loss of Battery connectionuC detects low batteryLOW A2.2R21, R23, R24, Short Decrease in Battery Capacity accuracy ObservationLOW A2.3R28, R29 OpenLoss of communication with microcontroller ObservationLOW A2.4R28, R29 CloseLoss of communication with microcontroller ObservationLOW A2.5C25, C26 OpenLoss of Decoupling CapsObservationLOW A2.6C25, C26 CloseLoss of Battery connectionuC detects low batteryLOW 3.3V PowerA3.1C31 OpenLoss of power filteringObservationLOW A3.2C31 ShortLoss of 3.3V Power SupplyObservationMEDIUM A3.3R25 OpenLoss of POWER GOOD feedbackObservationLOW A3.4R25 ShortLOSS of POWER GOOD feedback ObservationLOW A3.5C32 OpenLoss of Power filteringObservationLOW A3.6C32 ShortLoss of 3.3V Power SupplyObservationMEDIUM

12. 12 FT232 and GPS Blocks

13. 13 FMECA: FT232 and GPS IdentifierFailure ModeFailure EffectsMethod of Detection CriticaliltyRemarks FT232B1.1C21-C23 OpenLoss of decoupling CapsObservationLOW B1.2C21-C23 ShortLoss of Power to FT232ObservationMEDIUM B1.3FT232 FailureLoss of Debugging ability with Micro ObservationLOW GPSC1.1GPS FailureLoss of user positionObservationMEDIUM LockD1.1Servo FailureLoss of ability to unlock caseObservationMEDIUM

14. 14 Servo, MicroSD, and Compass Blocks 14

15. 15 FMECA: Servo, MicroSD, and COMPASS IdentifierFailure ModeFailure EffectsMethod of Detection CriticaliltyRemarks LockD1.1Servo FailureLoss of ability to unlock caseObservationMEDIUM MIcroSDE1.1MicroSD FailureLoss of ability to store and save route information ObservationMEDIUM CompassF1.1Compass FailureLoss of ability to determine a heading for the next waypoint ObservationMEDIUM

16. 16 Micro, RFID, and Buzzer Blocks 16

17. 17 FMECA: Micro, RFID, and Buzzer IdentifierFailure ModeFailure EffectsMethod of Detection CriticaliltyRemarks Micro-ControllerG1.1C2-C4, C6, C17 Open Loss of Decoupling CapsObservationLOW G1.2C2-C4, C6, C17 Short Loss of Power to MicroObservationMEDIUM G1.3R10, LED2 OpenLoss of Heartbeat MonitorHeartbeat LEDLOW G1.4R10, LED2 ShortLoss of Heartbeat MonitorHeartbeat LEDLOW G1.5RJ11 pin shortLoss of ability to program MicroObservationLOW G1.6Push Button shortLoss of user inputObservationLOW G1.7R7, C1, Switch open or close Loss of Ability to reset MicroObservationLOW RFIDH1.1RFID failureLoss of back door entry to locked case ObservationLOW BuzzerI1.1R22 openLoss of Buzzer alert when case is opened. ObservationLOW I1.2R22 shortIncrease in Buzzer current, buzzer can be damaged. ObservationLOW

18. 18 Level Translator and LCD Blocks

19. 19 FMECA: Level Translator and LCD IdentifierFailure ModeFailure EffectsMethod of Detection CriticaliltyRemarks Level ConverterJ1.1C27-C30 shortLoss of 3.3V and/or 5V Power Supply ObservationMEDIUM J1.2C27-C30 openLoss of Decoupling CapsObservationLOW J1.3R9 open/shortLoss of Level Translator ControlObservationLOW J1.4Level Converter Failure Loss of communication with all 5V modules ObservationMEDIUM LCDK1.1U17 open/shortLoss of LCD backlight controlObservationLOW K1.2C5, C7 openLoss of decoupling CapsObservationLOW K1.3C5, C7 shortLoss of 5V power supplyObservationMEDIUM K1.4LCD failureLoss of ability to display information to the user ObservationMEDIUM

20. Questions/Discussion