Senior Design I - Final Presentation

November 30, 2009

Outline Introduction

Problem Solution

Constraints Technical Practical

Design ApproachTestingProgressTimelineReferencesQuestions

About UsEvan SuggsEE-Pitch-Pad Design-Power-Scoreboard-Documentation

Nathaniel TaylorCPE-Firmware-Pitch-Pad Design-Website -Documentation

Joseph CunninghamCPE-Firmware-Scoreboard-Documentation

Greysen BlumkinEE-Firmware-Scoreboard-Documentation

ProblemDesign a product exclusively for baseball pitcher

training that records and analyzes a series of pitches while being portable and easy to setup.

SolutionA tactile pad composed of a collection of

switches and a digital scoreboard that displays the desired pitch location, number of hits and misses, total pitches, and percentage accuracy.

Technical ConstraintsConstraint Description

Detectable Speeds

The BPL must be able to detect speeds from 40 mph up to 115 mph.

Detection Area The BPL must be able to locate pitches in a 33” x 30” area.

Precision The BPL must be able to distinguish impacted areas within 4” x 6” segments.

Variable Pitch Routines

The BPL must have multiple pitch sequences available for training sessions.

Display Visibility

The display located on the BPL must be visible from a minimum distance of 60’ 6”.

Practical ConstraintsType Name Description

Sustainability Durability The BPL must be able to withstand repeated impacts of 115 mph.

Sustainability Maintenance

The BPL must be composed of replaceable parts.

[2]

Design Approach

TestingSoftware

Logic and FunctionalityDebugging and Optimization

DisplayPadding

Software simulation

Testing

DisplayProblem: Seven inputs are required to drive

one seven-segment display, meaning 77 pins would be required to drive the entire display

Solution: A single BCD driver and multiplexing are used to reduce the total number of needed pins to 15

Testing

Testing

Schematic for multiplexing 2 seven-segment displays

TestingEleven displays being multiplexedEach is on for 2ms, equivalent to a frequency

of about 42Hz

TestingAnother advantage

of multiplexing:Increased

brightness and visibility range

TestingPadding – Layered, medium-to-high density,

closed-cell foamsOne 4” x 6” padded detectable area -

complete

Testing

40 mph: 5 lbs from 3.3 ft115 mph: 20 lbs from 6.8 ft

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Prototype

Prototype Compared to Constraints

Constraints

Detectable Speeds

Variable Pitch Routines

Display Visibility

Detection Area

Precision

Prototype Capability

Testing of single switch section will verify the progress

Generates random sequence and pre-programmed sequence

Prototype can be adapted to larger seven-segment displays

More individual switch sections will satisfy this constraint

The single section meets this constraint

Goals for Design IIUsing large seven-segments for displayDesigning PCB for all electronicsConstructing all necessary detectable areas

20 4” x 6” sectionsCenter chase pitch section

Goals for Design IIDesigning and constructing the housing for

the completed BPL

References [1] Wood, Tate. E-mail. Olive Branch, Mississippi, September 14,

2009. [2] Sparkfun. “Concave Button – Black.” Internet:

http://www.sparkfun.com/commerce/product_info.php?products_id=9339,

[Oct. 7, 2009].

Questions