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MAE 156B

Tongue Touch Mouse & Keyboard

Proof of Concept Presentation

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Group N8: Jesus Salazar, Punit Aswani, Jiahuan He,

Garrett Almeida, Kwangbok Roh

Roh 1

Brief Overview Of Project

• Jason Eldred, our sponsor, is working on a tongue-touch device for our client, Stacy Bibb.
• Previous design is shown on the right.
• The device allows Stacy to click, type and browse on a computer.

Roh 2

Stacy with his current mouse and keyboard system.

Copper Wire- Contact Point

Alligator Clips

Halloween Mask- Chin Strap

Problem Definition

• While the current device is successful in operation, there are issues with:
• Headset comfort
• Current headset: halloween mask
• Device movement and rotation
• Current sensor attached to mask by just two zip-ties
• Capacitive sensor reliability
• Grabbing the wire causes capacitive interference and false positives

Huan 3

Current Status of Project

• Multiple 3D printed versions of our Chin Guard
• The most recent version (“The Ingenium - Version 1”) is shown on the right.
• All items have been purchased and received.
• Preliminary Capacitive Interference tests completed.

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Huan 4

Slots

Cat5 Keystone Jack Insert

Ventilation Holes

CPAP Strap Anchor Points

The Ingenium

Cat5 Keystone Jacks

High Risk Components

• Chin Guard - “The Ingenium”
• Geometry must satisfy comfort requirements and fit the Cat5 Keystone Jacks properly.
• Copper Capacitive Contact Points
• Must be food-safe while producing accurate capacitance readings.
• CAT5 Ethernet Cable and Cat5 Keystone Jacks
• Should easily attach/detach to the chin guard
• Capacitive/Board Program
• Should ensure reliable capacitance signal (no noise)

Jesus 5

CAT5 Ethernet Cable

Copper Capacitive Sheet Metal

Key Decisions - Chin Guard:“The Ingenium”

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• Not only several prototypes have been printed out but also tested on face
• For Stacy’s comfort the major goal now is to test the model on him and attach silicone putty accordingly

Jesus 6

Slots

Cat5 Keystone Jack Insert

Ventilation Holes

CPAP Strap Anchor Points

The Ingenium - V1

The Ingenium - V0

The Trident

Key Decisions - Food Safe Coating

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• Current Progress:
• Photo 3: sample coating on a single strip
• Photo 4: Prototype coating with MAX CLR�
• Further Test required
• Determine it’s capacitive sensing property.
• “Taste” issue
• Short cure time

Roh 7

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Key Decisions - CAT5 Cable Choice

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Punit 8

Unshielded Cable

Unshielded CAT5 Cable

• Multiple Wires (8)
• More Flexible
• Thinner
• Shields normal household EMI

Shielded CAT5 Cable

• Multiple Wires (8)
• More Rigid
• Bulkier
• Capable shielding of EMI and some capacitance

Key Decision: Unshielded CAT5 Cable would be our first choice for design/test

Key Decisions - Capacitive/Board Program

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Punit 9

• What Works?
• Strong Direct Signal
• What Doesn’t Work?
• Strong Oscillations to Zero while touching
• Indirect Contact Signal Increase
• Noisy�(many random spikes)

Key Decisions - Capacitive/Board Program

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Punit 10

• What Works?
• Strong Direct Signal
• Unaffected by Indirect Contact
• Controlled Oscillation
• No hints at noise
• What Doesn’t Work?
• Indirect Ground Contact lowers signal

Key Decisions - Capacitive/Board Program

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Punit 11

• Both Tests Given Low, Similar Sampling Rates �(Better matches final product sample rate)
• CircuitPython: 139 samples/sec
• Arduino: 146 samples/sec
• Arduino 2nd test: 5963 samples/sec (fastest) �(Not Shown) - Less Noisy, but still hints
• CircuitPython Wins!!
• Greater Reliability
• Why? Believe it has an accelerated program which either:
• Adjusts sampling rate to avoid noise
• Filters printed/usable capacitance data
• Further Application
• Applying code and setup to Final Design

Capacitive Test Setup:

CAT5 cable and Adafruit CPB

Key Decisions - CAT5 Cable Connection

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• Keystone Jacks make the cable easily to remove and replace for maintenance
• Jack will mounted to the chin cup using the built in locking lugs
• Modify the CAD design of “The Ingenium” in order to secure the Cat5 Keystone Jacks on the chin guard for ease of use

Garrett 12

Proof-of-Concept Demonstration

Garrett 13

Proof-of-Concept: Results

• Unfortunately, the prototype does not function properly
• Activates action for two tabs when only touching one
• There is crosstalk between channels
• Could be from wires or tabs being too close together or from the keystone jack
• Further testing/troubleshooting is needed
• CAT5 cable hits your chest during downward head movements

Garrett 14

Cat5 Keystone Jacks

Possible Design Solutions

Jesus 15

“The Ingenium” - Version 2

• CAT5 Keystone Jack inserted at a 90° angle
• Wiring might get complicated
• More compact design

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• CAT5 Keystone Jack inserted at a 180° angle
• Wiring is straightforward
• The insert makes this design more bulky

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“The Ingenium” - Version 3

Cat5 Keystone Jack Insert

Cat5 Keystone Jack

CAT5 Slots

Timeline for Future Plans

• All the parts have been purchased and machined at least once for the current prototype
• Unless something else needs to be purchased to fix the problem

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CPAP Strap

The Ingenium

Cat5 Cable

Cat5 Keystone Jacks

Garrett

Plastic Set Screws

Unresolved Questions

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1. How to make the application of silicone putty inside “the Ingenium” to best fit Stacy’s chin shape?
2. When should the team take the new design to Stacy’s house and test on him?
3. What’s the problem with the current setup of our model that the capacitive touch points are not functioning properly?

Huan 17

Project Management: Gantt Chart

Huan 18

Questions?

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