P11011: Modular Motion Tracking Knee Flexion Unit V1
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Select Product Concept(s)

Knee Flexion

Sensor Decision Matrix
Cost Reasoning Ease of Use Reasoning Durability Reasoning Weight Reasoning Precision Reasoning Total Score
Flex Sensor 3 The Flex Sensors are around $60 each, so we gave this a low score 8 The Flex Sensors are fairly easy to use, so we gave this a high score 3 The Flex Sensors are easily bent after a few uses, so we gave this a low score 7 The Flex Sensor is fairly light, so we gave this a higher score 3 During reproducibility testing, the Flex Sensor did not reproduce results, so we gave this a low score 2.952
Inclinometer 3 The Inclinometers are $60 each, so we gave this a low score 3 The Inclinometers require more interfacing, and are harder to use, so we gave this a lower score 8 The Inclinometers are expected to be fairly durable, so we gave this a higher score ***Change After Testing*** 9 The Inclinometer is very light, so we gave this a high score 9 The Inclinometer is expected to be able to accurately reproduce results, so we gave this a high score ***Change After Testing*** 3.961
Potentiometer 8 The Potentiometers are around $10 each, so we gave this a higher score 9 The Potentiometers are very easy to use, and require minimal interfacing, so we gave this a higher score 6 The Potentiometers are very durable, being able to withstand over 100,000 cycles, so we gave this a higher score 4 The Potentiometer is fairly heavy compared to the other sensors, so we gave this a lower score 9 During reproducibility testing, the Potentiometer proved to be a very precise sensor, so we gave this a higher score. 4.437
Weight 12.6% 11.7% 9.8% 13.2% 14.0%


Attachment Decision Matrix
Cost Ease of Attachment Durability Comfort Total Score
Concept 1 8 8 6 7 43
Concept 2 4 5 8 5 35
Concept 3 3 4 9 5 34
Weight 1 2 2 1
Concepts from Generate Product Concepts page under Knee Flexion.


1st Draft Exploded View

1st Draft Exploded View


Head Tilt

Sensor Decision Matrix
Cost Ease of Use Durability Availability Stand-Alone Functionality Size Total Score
Atomic IMU 4 6 6 8 8 4 58
Razor Ultra-Thin IMU 6 7 8 8 2 9 67
Razor IMU 4 9 8 7 8 8 77
Accelerometer 8 3 6 8 2 8 56
Weight 1 2 1 1 2 3
Concepts are from the Head Tilt Sensor Comparisons page.


Attachment Decision Matrix
Cost Ease of Attachment Durability Comfort Total Score
Concept 1/1.1 9 9 7 7 48
Concept 2 4 6 9 4 38
Concept 3 5 6 9 6 41
Weight 1 2 2 1
Concepts from Generate Product Concepts page under Head Tilt.


1st Draft Exploded View

1st Draft Exploded View


Connection Interface


Attachment Decision Matrix
Cost Future Expandability Ease of Use Size Total Score
USB to I2C 6 3 4 8 39
Arduino Board 4 9 6 8 63
Weight 1 3 2 2


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