Bluetooth Twiddler Ubiquitous Computing CS 7470 Jeremy Rogers Amirali Charania.
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Transcript of Bluetooth Twiddler Ubiquitous Computing CS 7470 Jeremy Rogers Amirali Charania.
Bluetooth TwiddlerUbiquitous Computing
CS 7470
Jeremy Rogers
Amirali Charania
Background
Current Twiddler's Drawbacks PS/2 High energy consumption Loses custom configuration
Background
Current Twiddler's Drawbacks PS/2 High energy consumption Loses custom configuration
Our Twiddler's Advantages HID device via Bluetooth Lower energy consumption Rechargable
Motivation
Related Work
Wireless Twiddler Used with QBIC belt computer No specific plans or code
Bluetooth Accelerometer-based Twiddler Developed by a GT grad in 2004 Uses Serial Port Profile, not HID Profile “Rough Guide” – no code / documentation Rechargeable Li-Ion battery Fits inside Twiddler case
Related Work (Continued)
Current Design
HID Profile
What We Did - Hardware
The "Hacked" Bluetooth Accelerometer
Components:
-keygrid-battery leads-connector-power plug (NS)
On/Off Switch Closeup
What We Did - Software
Bluetooth Protocol Stack
Bluetooth Profiles
Development Environment
Bluetooth chip – Bluecore2 Ext Bluelab xIDE Casira Development Kit
Application Stages
Library Initialization Connection Library HID Library
HID Connection Detection of Keypress Reporting of Keypress
Improvements
Reporting Method Robust Pairing (Linux and Mac) Hardware
External storage of keychord mappings Line configuration
Strobing Method Mouse and Accelerometer LED Indicators
Acknowledgments
Thad Starner
Peter Presti
Jay Summet
Kent Lyons
Daniel Ashbrook
Girish Saini
Travis Deyle
Adit Ranadive
