Bocce Ball Group

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Bocce BallGroup 200 Paul Frisch, Nathan
Miller, and Steven SchneiderAdvisor Dr. Glower
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Our Client

• Local Special Olympics
• BRAD
• Bio Research to Aid the Disabled

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Bocce Ball Scoring System

• Background/Objective
• Design Approach
• Block Diagram
• Flow Chart
• Project Characteristics
• Budget
• Future Work
• Conclusion
• Questions

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Objective

• Design a System to measure the closest bocce ball
  to the target ball.
• The system must be able to recognize the target
  ball and reference all other bocce balls from the
  target ball.
• The system design must be easy to use and display
  in output form the winning bocce ball or balls.
• The main objective was to see if sound could be
  used as a distance measurement.

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Design Approach

• Try to interface a Linx transceiver with a
  microprocessor.
• Use the speed of sound to stop an internal
  counter in the microprocessor.
• Use a comparator mode to analyze time values as a
  measuring system.

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Anticipated Results

• When the project is completed and the time comes
  to determine the winning ball, the unit designed
  will be placed over the target ball and determine
  the closest ball.
• Once the closest ball has been determine, the
  winning ball will output an LED display which
  teams corresponding ball was the winner.

Winning Ball
Target Ball
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Expected Outcome
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Final Hub Block Diagram
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Final Design for Hub

• Power
• Rechargeable Batteries
• Microprocessor
• PIC16f876
• Transceiver
• Linx transceiver

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Hub Block Diagram

• Change Screens Now

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Final Ball Block Diagram
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Final Design for the Ball

• Power
• Rechargeable batteries
• Microprocessor
• PIC16f876
• Transceiver
• Linx transceiver
• Microphone
• MIC Cart microphone
• Amplifier
• Single input dual operational amplifier (MCP602)
• Output
• LEDs

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Ball Block Diagram

• Change Screen Now

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Software Technical Challenges

• Writing code to implement all of the required
  functions
• Using bi-directional wireless communication to
  transmit data
• Overcoming timing issues within the transceivers
  and programs
• Time Restraint

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Hardware Technical Challenges

• Placing and Securing the components
• Implementing a narrow band pass filter with a
  microphone input
• Effectively using inexpensive circuit boards

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Stage 1


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Stage 2
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BandPass Filter Design Equations

• fo Center Frequency
• 1) R3 2/(2pC(Bandwidth))
• 2) R 1/((2pfo)²R3C²)
• 3) R R1R2/(R1R2)

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Bandpass Filter Characteristics
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Stage 3
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Data Recordings
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Power Budget

• Power needed to operate the components within the
  ball
• Transceiver 12 mA
• Microprocessor 4 mA
• Microphone and Amplifier 1 mA
• LEDs 2 mA
• Therefore less than 20mA are need to operate the
  ball
• Example
• NiMetal Hydride rechargeable battery
• 1800mA/hrs gives approximately 60 hours of use

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Cost per Ball

• Linx Transceivers (1) 50.00
• Circuit Boards (1) 10.70
• Microprocessor (1) 7.70
• Microphones (4) 8.00
• Battery Pack (1) 8.00
• Power Switch (1)
  1.95
• Female Power Jacks (1)
  1.25
• LEDs (9) 2.44
• Voltage Regulator (1)
  2.15
• Operational Amplifier (3)
  1.65
• Bocce Balls, Misc. 3.65_
• Total 97.49_
• Total For 8 Balls
  765.92

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Cost of Hub

• Linx Transceivers (1) 50.00
• Circuit Boards (1) 10.70
• Microprocessor (1) 7.70
• Buzzer (1)
  3.60
• Battery Pack (1) 8.00
• Power Switch (1)
  1.95
• Female Power Jacks (1)
  1.25
• LEDs (1) 0.44
• Voltage Regulator (1)
  2.15
• Push Buttons (3)
  3.60
• Miscellaneous
  2.10_
• Total 91.49_
• Total Cost For Project
  857.41

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Cost
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Future Work

• Timing adjustments to the code
• Ensuring exact component values
• Calibration of filter triggers
• Future testing enclosed in the balls

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Project Conclusions

• Questionable Accuracy
• Counter values do not represent distance well
• The overall method was successful in determining
  which ball was closer

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Questions?