Transcript Presentation

Self-Sustainable Electric
Golf Bag
Final Presentation
Group 19
Jon Kinney, Cory Edwards, Harrison Kantner
30 April 2013
Introduction
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Necessary to stay hydrated
Nice golf courses prohibit coolers
Clubhouse prices are inflated
Keep up with technology
• Fun and useful concept
Features
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Solar powered
Temperature control via keyboard control
Heating and cooling pouch
Digital Scorecard displayed via LCD
USB power
AC outlet charging capabilities
Top Level Block Diagram
Power Module – Block Diagram
Power Module – Design
• Solar Panels output 11V-21V
• Wall adapter converts 120V AC to 12V DC
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Battery charger requires 11V-17V input
Battery outputs 7.4V
USB requires 4.5V-5.5V to charge
Thermoelectric Modules require 3.3V
Power Module – Design
Charging Circuit
Power Module – Design
7.4V to 5V or 3.3V Buck Converter
Theoretical Duty Cycles
5V:
67.6%
3.3V: 44.6%
Power Module – Requirements
Charging Circuit
• Solar Panel voltage reduced to 15V ± 25%
• Wall adapter open circuit voltage is 12V ±
5%
• Battery voltage is 7.4V ± 5%
Power Module – Verifications
Charging Circuit
• Solar Panel voltage
regulated to 17.5V
• Wall adapter voltage is
12V DC
• Both circuits charged
battery
Power Module – Requirements
Buck Converters
• Gating signal amplitude > 8.8V
• Buck converters reduce battery voltage to
3.3V and 5V ± 10%
Power Module – Verifications
3.3V Buck Converter
Power Module – Verifications
5V Buck Converter
* Under no load
USB Module – Design
USB Module – Requirement
and Verification
• USB port must
be able to
charge all USB
devices
Temperature Module – Block
Diagram
Temperature Module - Design
• Temperature sensor reads bag temperature
– Sends data to Display Module
• User sets desired temperature
• Controller decides whether to heat/cool
• Controller sends signals to MOSFET
switching circuit
– Changes current direction across
thermoelectric modules
Temperature Module – Design
Temperature Sensor
• Parasitic Power
• Sends 16-bit serial temperature data to
microcontroller
Temperature Sensor – Design
User Input
• Five tactile switches
• Positive edge triggered
• Debounced via
software
• Used to set
temperature in 5⁰F
increments
Temperature Module – Design
Switching Circuit
Temperature Module Requirements
• User-set temperature increments/
decrements by 5⁰F
• Controller sends correct switching signals
• Sensor accurately reads bag temperature
• Temperature inside of the bag does not
exceed 160⁰F
• Temperature differential across heat sinks
exceeds 50⁰F
Temperature Module Verifications
• User-set temperature increments/decrements
by 5⁰F
Temperature Module Verifications
Sensor accurately reads bag temperature
Temperature Module Verifications
Temperature differential across heat sinks
exceeds 50⁰F
Scorecard Module – Block
Diagram
Scorecard Module - Design
• Controller creates 4x20 grid
• Buttons allow user to traverse scorecard
and edit scores
• Continuously updates total score
Scorecard Module - Design
Scorecard Module Requirements
• Displays constant images
• Toggles between “move” and “write”
mode
• Changes hole in “move” mode
• Changes score in “write” mode
• Scorecard keeps running total
Scorecard Module Verifications
Display Module – Block
Diagram
Display Module - Design
• 4x20 LCD
– Scorecard
• 2x8 LCD
– Total and
Temperature
• 16 pins
• 4 data lines
Display Module - Requirements
• Backlight turns on when powered with
3.3V
• 4x20 LCD displays scorecard grid
• 2x8 LCD displays total score and
temperature control
• LCDs update image when controller reads
new input
Display Module - Verifications
Project Build
Solar Panel Rack
Project Build
Power PCB
• Wide traces
capable of 6A
• Spaced inductors
to reduce coupling
Project Build
Interface PCB
• Minimal top
traces
• Allows for
easy
Arduino
wiring
Project Build
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Displays/input
Power switch
USB port
Temperature
controlled
pouch
Challenges
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Debouncing button inputs
Replacing op-amp design with gate drivers
Regulating solar panel output voltage
Fixing PCB after 20W power short
Testing solar panels under ideal conditions
Thermal pouch construction
– Failed thermoelectric module
Future Work
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Better housing for components
Cleaner wiring
More effective thermoelectric cooler setup
More efficient solar panel voltage
regulation
Thanks for Listening!
Questions?