Concept Evaluation CriteriaDirectionally IntuitiveSimple User InterfaceOne Size Fits AllRecognizable Feedback to UserVersatileRelatively Inconspicuous
PUGH Method
NecklaceVestBelt/Fanny Pack
abcdef
ModularMagnetometer not in DesignMagnetometer IncludedVibrationActuation
Non Modular (Consolidation of Components)KEY
PUGH Method Concept Criteria ace bce ade bde acf bcf adf bdfSize + + + + S S S SWeight + + + + S S S SCost S S S S S S S SFeasibility S S S S S S S SComfort + + + + S S S SConspicuous Nature + + + + + + + +Usability S S S S S S S SVersatility + + + + + + + +Durability + + + + + + + +Communication Capability - + - + - - - -Ergonomic + + + + + + + +Attachment/Removal Ease + + + + + + + +Training Time S S S S S S S SConsistency S S + + S S + +Power Consumption S S S S S S S SHeat Dissipation - + - + - + - +Fashion Appeal S S S S S S S SSimplicity + - + - S - S -Direction Sensing S S + + S S + +Total Score Positives 9 0 11 2 5 6 7 8
Negatives 2 1 2 1 2 2 2 2
NECKLACE
PUGH Method Concept Criteria ace bce ade bde acf bcf adf bdfSize + + + + S S S SWeight + + + + S S S SCost S S S S S S S SFeasibility S S S S S S S SComfort + + + + S S S SConspicuous Nature + + + + + + + +Usability S S S S S S S SVersatility + + + + + + + +Durability + + + + + + + +Communication Capability - + - + - - - -Ergonomic + + + + + + + +Attachment/Removal Ease - - - - - - - -Training Time S S S S S S S SConsistency S S + + S S + +Power Consumption S S S S S S S SHeat Dissipation - + - + - + - +Fashion Appeal S S S S S S S SSimplicity S + S + S + S +Direction Sensing + + + + + + + +Total Score Positives 8 11 9 2 5 7 6 8
Negatives 3 1 3 1 3 2 3 2
VEST
PUGH Method Concept Criteria ace bce ade bde acf bcf adf bdfSize + + + + S S S SWeight + + + + S S S SCost S S S S S S S SFeasibility S S S S S S S SComfort + + + + S S S SConspicuous Nature + + + + + + + +Usability S S S S S S S SVersatility + + + + + + + +Durability + + + + + + + +Communication Capability - + - + - - - -Ergonomic + + + + + + + +Attachment/Removal Ease + + + + + + + +Training Time S S S S S S S SConsistency S S + + S S + +Power Consumption S S S S S S S SHeat Dissipation + + + + + + + +Fashion Appeal + + + + + + + +Simplicity S + S + S + S +Direction Sensing S S + + S S + +Total Score Positives 0 2 2 4 7 8 9 0
Negatives 1 S 1 S 1 1 1 1
BELT/FANNY PACK
Benefits of Final DesignInconspicuous in NatureComfortable Placement for UserIntuitive to UserReliable DirectionalityConsistent FeedbackClient Approved (Interview with Potential
Customer)
Combination of ComponentsModular design with vibrationStationary placement for directional deviceHeat dissipation and locationReduced potential for damage
Final Design: KeypadPad Size: 2.0” x 1.5” x 0.1” Weight: 0.17oz Connector: 7 pins (Pitch 2.54mm)Maximum Circuit Rating:
35VDC, 100mA
Final Design: MagnetometerHMC6352 0.6” x 0.6”Simple, clean, degree resolution compass
heading with full integration of 2-Axis magnetic sensors and electronics
Cost: $34.95http://www.sparkfun.com/products/7915
HMC6343 0.8” x 0.8” 3-axis accelerometer with tilt compensation Cost: $149.95http://www.sparkfun.com/products/8656
Final Design: MagnetometerLSM303 Breakout Board 2.0cm × 2.0cm 3-axis accelerometer combined with a
3-axis magnetic sensor Cost: $29.95http://www.sparkfun.com/products/10703
**Micro-controller must be selected first, so it can be determined where or not the digital compass will be able to affectively interact.(MCU selected might already include a digital compass)
Final Design: Radio-Frequency IDentification SystemIncludes:A scanning antennaA transceiver with a decoder to interpret the
dataA transponder - the RFID tag
**Antenna puts out radio-frequency signals in a relatively short range. Providing the RFID tags with the energy to communicate with the reader.
Final Design: RFID AntennaLight weight (>1lb) and only 8.5 inches
squareSuperior performance8 dBi gain with broad coverageIt is suitable for both indoor and outdoor
wireless applications in the 900MHz ISM band, GSM, 900MHz cellular and RFID applications.
Final Design: RFID Reader
Criteria SkyetekModel M9 Module (MH)
Read Range 3.5mI/O Pins 4
Size (mm) 70x53x9Weight 12.5g
Frequency 862-955 MHZ
Supply voltage 4.5-5.5V
Final Design: RFID TagsCriteria Alien Alien Alien Alien AlienModel "G" "Squiggle" "Squiglette" "Short" "2x2"Frequency 840-960MHz 840-960MHz 840-960MHz 840-960MHz 840-960MHzRead Ranges 20ft 20ft 20ft 20ft 20ftSize 3.8"x.9" 3.73"x.319" 2.76"x.37" 2.76"x.67" 1.73"x1.81"factory programmed UID code yes yes yes yes yes# of bits in UID 64 64 64 64 64
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