Self-Sustainable Electric Golf Bag Final Presentation Group 19 Jon Kinney, Cory Edwards, Harrison Kantner 30 April 2013

Introduction Necessary to stay hydrated Nice golf courses prohibit coolers Clubhouse prices are inflated Keep up with technology Fun and useful concept

Features 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 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 5 ⁰ F increments

Temperature Module – Design Switching Circuit

Temperature Module - Requirements User-set temperature increments/ decrements by 5 ⁰ F Controller sends correct switching signals Sensor accurately reads bag temperature Temperature inside of the bag does not exceed 160 ⁰ F Temperature differential across heat sinks exceeds 50 ⁰ F

Temperature Module - Verifications User-set temperature increments/decrements by 5 ⁰ F

Temperature Module - Verifications Sensor accurately reads bag temperature

Temperature Module - Verifications Temperature differential across heat sinks exceeds 50 ⁰ F

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 Displays/input Power switch USB port Temperature controlled pouch

Challenges 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 Better housing for components Cleaner wiring More effective thermoelectric cooler setup More efficient solar panel voltage regulation

Thanks for Listening! Questions?