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This report addresses critical reliability and safety issues identified in kiosk operations, including inconsistent communication between the kiosk, microcontroller, and database, malfunctioning servo motors, unreliable data from IR sensors and load cells, improper item dispensing from the hopper, and uncontrolled conveyor belt movement. Components likely to fail were identified through FMECA, including the Freescale Coldfire 52233 and various regulators. Recommendations for improvements include using non-flammable materials, enclosing hoppers, adding hand guards, and implementing clear warning labels near moving parts.
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ECE 477 Senior DesignTeam 7 Reliability and Safety Ben Horst Katie Taller Matt Klass Jacob Wyant
Safety and Reliability Issues • Communication between kiosk, micro, and database is inconsistent • Servo motors don’t function as intended • IR sensors / load cell don’t provide reliable data • Inventory items don’t fall correctly within the hopper • Conveyor belt movement is uncontrolled
Components Likely to Fail • Freescale Coldfire 52233 • Step Down Voltage Regulator • N Channel 12V MOSFET • Low Dropout Regulator • Quad Operational Amplifier
Improvements • Construct the project out of a non-flammable material • Enclose the hoppers • Add hand guards to the conveyor belt • Add warning labels near moving parts