Transcript pptx - Purdue College of Engineering

Team 13
John Ashmore, Brian Bell, Jason Giles, Jing Li
Components Likely to Fail

Complexity; Multiple I/O pins
◦ Microcontroller on base station– PIC32MX
 Failure Rate = 6.88/1 million hours
◦ 1 failure every 16.58 years
◦ Microcontroller on mobile platform– PIC32MX
 Failure Rate = 8.16/1 million hours
◦ 1 failure every 13.98 years
◦ AL242 Video Decoder
 Failure Rate = 2.80/1 million hours
◦ 1 failure every 40.74 years
Components Likely to Fail

High Operating Temperature
◦ Battery/Voltage Regulators – base station
 Failure Rate =.8368/1 million hours
◦ 1 failure every 136.32 years
◦ Battery/Voltage Regulators – mobile platform
 Failure Rate = .8736/1 million hours
◦ 1 failure every 130.58 years
◦ LCD screens – LCT-H320240M35W
 Commercial Product already, failure rate assumed
to be acceptable
◦ Swann Cameras SW231-WCH
 Commercial Product already, failure rate assumed
to be acceptable
Microcontroller
Failure No.
1A
1B
Failure Mode
Possible Causes
Failure Effects
Method of
Criticality
Detection
Communication PS2 controller
Inability to control Logic Analyzer
Low
Failure with PS2 malfunction/softw system
controller
are bugs
Reset Malfunction Pushbutton
Unpredictable
Tested with DMM Low
Shorts/Too much behavior of device
EMI
Remarks
Renders design
inoperable but
reparable
Renders design
inoperable but
reparable
Video Processing
Failure No.
2A
2B
2C
2D
Failure Mode
Possible Causes
Camera stops
Environmental
transmitting video interference to
signal
wireless
transmission
AL242 clock
crystal ocsillator
failure
malfunctions
AL242 Synch
AL242 internal
signal fails
error
LCD screen
overheats
Failure Effects
Unable to view
video feed in
goggles
Video signal
display ceases
Video signal
display in goggles
becomes
displaced
poor
Potentially leak
venhilation/power lcd
overload/specific chemicals/Worst
display
case scenario
component shorts results in
overstimulating
eyes - causing
momentary
blindness
Method of
Criticality
Detection
Observation of
Low
distortion in video
signal in goggles
Remarks
Loss of remote
viewing, solution:
deploy vehicle
within range
oscilloscope to
Low
clock signal
Observation of
Low
distortion in video
signal in goggles
Observation
High
Unrepairable/Pote
ntial bodily harm
to user
Wireless Functional Block
Failure No.
3A
Failure Mode
Wireless
transceiver loses
connection
Possible Causes
Failure Effects
Method of
Detection
out of
control of vehicle Observation
range/environmen at range is lost
tal
interference/anten
na malfunction
Criticality
Low
Remarks
Reparable
Power Supply
Failure No.
4A
4B
4C
4D
Failure Mode
Possible Causes
Failure Effects
Method of
Criticality
Detection
Observation/DM Low
M
Voltage goes to 0 External
Device loses
shorts/Failure of power; device
certain
ceases function
components/Batte
ry header
disconnect
Voltage above
Voltage regulator Microcontroller Observation/DM Medium
specifications
breakdown,
and other sensitive M
resistors short/stay devices are
open
overloaded
Battery overheats short of certain
battery loses
Observation
High
components, most charge, worst case
likely decoupling scenario is Li-ion
capacitors
battery explodes
Unstable voltage Voltage regulator Digital devices
Oscilloscope
Low
output/voltage
breakdown, minor lose logic
swing
components have functionality
weak connection
Remarks
Typically
reparable
Unreparable; no
damage to user
Unreparable;
potential damage
to user from
battery explosion
Reparable
Questions?