1. P17001: Wearable Interface Design Iterations Team Intro & Background
Requirements
Goal
Create a wearable device to sense user input and interface with a mobile device to supplement texting
Eliminate distraction
Provide proof-of-concept
Develop input sensor system & typing scheme
Investigated various sensors to implement this idea, but decided on mechanical switches
Customer
Low Profile
Lightweight
Communicates wirelessly
Comfortable to wear
Capable of interacting with visual display
Limited electronics on fingers
Accommodate different hand sizes
Weighs less than 1 pound
Less than 6 steps to put on/take off
Lag time is less than 100 ms
Protrudes less than 1” off hand
Battery life is longer than 2 hours for full use
Engineering
Design Iterations
CAD Model
Adjustable knot
Chain pulls
Cord locks
Final Design
Analysis and Testing
Recommendations
Mechanical
Switch Activator
Designed adaptor enabling switch to be activated by string
Adjustable Function
Paracord combined with push button cord locks allowed for device to be adjustable to any hand size
Device Casing
Designed to fully encapsulate device while allowing user to interact with on/off button, LED and adjust size of finger loops
Software & Electrical
Utilizes Teensy 3.2 (Cortex M4): Converts binary user input to ASCII characters and transmits to Bluetooth module. Additionally provides vibration and LED user feedback.
Device has 56 unique character inputs
Alphanumeric
Special Characters
Wireless Bluetooth communication between device and phone
Multiple PCB’s can be used to introduce flexibility, as well as decrease the surface area of the device through stacking
Investigate adding an accelerometer to the device to incorporate hand gestures
Consider component replacements to drive miniaturization
Team
From left: Arshia Sasson (EE), Nick Jakse (EE), Nicole Sauter (IE), Jaclyn Amann (BME), Carolyn Krasniak (BME), Emmanuel Aire (EE)
Acknowledgments
George Slack and Russel Phelps (Guides)
Willow Baker (Customer)
Dr. DeBartolo & MSD Office