ECEN 4610 Capstone Design Lab Fall 2009

Preliminary Design Review

Team ACRONYMAnother Capstone Research Oriented Nonsensical Yao Ming

Introduction

• Andrew Rogowski, ECEN/MUSC• Chris Tooley, ECEN• Ian Rees, ECEN• Kaylee Bush, EEEN• Mike Killian, ECEN

Purpose• To create a pool cue with embedded sensors to measure

the motion of the cue as a stroke is being made.

• This is designed as a teaching aid to allow a player to become a better pool player by being able to visualize the errors in his or her stroke thus allowing them to be corrected.

Overview• A pool cue containing a 3-axis accelerometer, a 2-axis

gyroscope, a Bluetooth transceiver, memory, processor and a battery.

• A receiver that records visual information as well as process the data from the pool cue and sends the necessary measurements to a computer.

• A computer that will display the video of the player stroking and give 3-D visual feedback on the strengths and weaknesses of the player's stroke.

High Level Diagram

Pool Cue Diagram

Accelerometer

• Measure the relative position of the stick in 3D space

• Digital Accelerometer– 8G Max– Resolution of 64 count/G– Low power draw (~70μA during data acquisition)

Gyroscope

• 2-axis Analog Gyroscope– Output a reference voltage used with an A2D

converter– Sensitivity is based on the sampling rate of the

A2D converter– Low Power Consumption (~6.8mA)– 2-axis checked will be Pitch and Roll

Microprocessor

• Design Trade-offs– Balance of power in Microprocessor vs. Computer– Size Issues– Power Consumption Issues– Interface with Accelerometer with I2C– Interface with Gyroscope with Internal/External A2D

Converter– Tetris

• Use same family of processor for pool cue and receiver

Receiver Diagram

Video Camera

• Real life documentation of each shot taken for comparison with animated result of shot

• Fixed position• The video feed back could potentially be used

for image recognition of the location of the balls– More detailed CAD result– Teaching/Learning program capabilities

USB/Ethernet

• The box interfaces with the computer via a USB or Ethernet connection

• Transfer accelerometer and gyroscope data from the box to the computer for user interface program

• USB or Ethernet will be decided based on user friendliness and simplicity of programming

Bluetooth/Serial Connection

• Initially use wired RS-232 between Box and Cue– Ease of Debugging– Back-up connection for Bluetooth– Smooth transition to Bluetooth

• Bluetooth between Box and Cue– No limitations on cord length– Ease of use of the cue– No cable hassle for user– Initially no pairing required

Goals

• Pool cue motion tracking system• Receiver that processes data transmitted from

the pool cue, then sends the processed data to the computer with the recorded video.

• Computer program that displays data received from the video camera box in a 3D animation versus the recorded video.

• Inductive charging

Extended Goals

• Pool cue able to detect the difference between a break shot and a regular shot.

• User feedback on the pool cue• Breathalyzer• Box able to detect multiple pool cues• Tracking system of the pool balls

Preliminary Testing

• Wii Remote– Used to get specs for accelerometers– [Plot]

• Electronic Toothbrush Charging System– Used to test a possible inductive charging solution

for cue– [Image]

Preliminary accelerometer data

Schedule

BudgetItem Approx. Cost ($) Vendor

Pool Cue 70-90 Ebay

Accelerometer 15 SparkFun.com

Accelerometer Testing Board 28 SparkFun.com

Gyroscope 12 Digikey.com

Homemade Gyroscope Testing Board (Board, Resistors, A2D, etc.)

25-40

Microprocessor 20 Digikey.com

Bluetooth 100 SparkFun.com & dealextreme.com

Testing Time (5 weeks) 30 Pool Halls

Toothbrush 20 Target

Prototype Boards 100

Batteries 20

Plastic 20

USB Transceiver 20

Mini Pool Table 200 Amazon.com

TOTAL ~715

Funding

• UROP Grant• EEF Mini Proposal• Local companies• Sample parts from vendors

Division of Labor• Camera Box– 3 people

• Video Camera—Andrew • USB/Ethernet—Ian • Bluetooth/Serial Connection—Chris

• Pool Cue– 2 People

• Accelerometer/Gyroscope—Mike • Microprocessor/Bluetooth—Kaylee

• Documentation– All

Risks

• Parts– Extra Parts– Contingency

• Software– Drivers to install/run on any computer

• Physical Implementation• Video Camera• Bluetooth• Interfaces

QUESTIONS