1. ALEX BUSCHKOETTER ALEX GLENN KIMBERLY SOONG PETRA MUSTAFA Group 4: 3MS

2. Components Microcontroller Power supply  Switch-mode power supply  3.3V regulator Battery  Charger  Gauge  Wall wart Zigbee

3. Criticality Levels High  Flying pieces, potential harm to user Medium  Potential (lasting) damage to product in use Low  No lasting damage

4. FMECA Analysis: Power Supply Failure No. Failure ModePossible Causes Failure Effects Method of Detection CriticalityRemarks A1Ramped-up voltage of 5V not attained. SMPS malfunction. LCD does not work. BJT turns off, affects speaker, buzzer and vibrate motor ObservationMediumLCD and BJT require 5V to operate. A2Overvoltage from wall wart to battery Battery charger damaged. Battery does not charge or overcharges. Battery un- rechargeable or may overcharge. Battery explodes. MeasurementHigh A3Main supply voltage > 3.3V Regulator damaged. Overall board failure or overload. MeasurementMediumMost components run on 3.3V with max rating of 3.4V

5. FMECA Analysis: Microcontroller Failure No. Failure Mode Possible CausesFailure Effects Method of Detection CriticalityRemarks B1Delayed switching Damaged/Missing decoupling capacitors Wonky UART transmissions, pushbutton de-bouncing fails. Measurement Observation MediumUART is what controls the Zigbee module. B2Stuck I/O pins Shorted. Software bug. Incorrect user functionality, in/outbound communicatio n loss MeasurementMedium B3Not running Overloaded or underpowered. Shorted. Functionality of product is zero. Measurement Observation MediumComponents may turn on but would not work.

6. FMECA Analysis: Zigbee Failure No. Failure Mode Possible Causes Failure Effects Method of Detection CriticalityRemarks C1Unable to detect peripheral proximity RSSI malfunction, software issue. Unable to detect proximity of peripherals Measurement Observation MediumThe main purpose of the project is this function. C2Audio not transmitted or received Zigbee module not on. Tx/Rx pins stuck, software issue. Audio unable to be transmitted or received on base nor peripheral. ObservationMedium