Transcript Senior Design Night Presentation

Calvin College
Engineering Senior Design
Team 10
May 3, 2008
Outline
 Introduction
 MFC
 Power Regulation
 System Monitoring
 Feed/Waste System
Team 10: Members
Jared Huffman
Brianna Bultema
Achyut Shrestha
Chris Michaels
Why Biobattery?
 Problems of Conventional Batteries
 “Hard to Do”
 Interdisciplinary Talents
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Design Goals
 USB Power Output
 Refillable Food Supply with Alert
 Semi-Continuous
 System Monitoring
 User friendly
 Indicates Failure Mode
 Improved Power/Volume Ratio
 Anode Cube
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Project Division
Four Main Parts of Our
Biobattery Project
 Microbial Fuel Cell
 Electrical Monitoring
 Electrical Regulation
 Feeding and Case
Design
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Decision-Making Process
1.
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4.
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9.
10.
Brainstorm (Group and Individual)
Discuss Design Requirements
Research
Design
Present Design to Team
Refine Design
Present Refined Design to Team
Order Parts
Assembly
Testing
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
How Microbial Fuel Cells (MFC) Work
Story of Electrons:
 Anode
• Electrons from
Acetate to Geobacter
• Geobacter sends
electrons outside
itself to electrode
 Cathode
• Electrons combine
with Oxygen and
Protons to form water
Schematic courtesy of Derek R. Lovely
(Microbial Energizers: Fuel Cells the Keep Going?)
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Microbial Fuel Cell Design
 Species: Geobacter Metallireducens
 Most Efficient Colonization and Power Density
 Widely tested
 Membrane: Cellophane vs Nafion
 Balance Cost and Permeability
 Electrode: Carbon Cloth vs Carbon Porous Block
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Anode Cube
Waste
Output
Food
Input
Electrode
Location
(Each Face)
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Power Management
Regulated
USB Power Switching
Power Supply
5V
5V
OC
3V
AVR Butterfly
Temperature sense
Vin
3V
Power management module
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Regulation
 Output: 4.75V-5.25V, 100mA-500mA for USB
Compatibility
 Step up voltage from 3.0V to 5.0V
 Research and Decisions
 Maxim MAX1524 Boost Controller
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Regulation
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Monitoring System
 Goal
 Monitor the status of the system and communicate
relevant status to user
 Requirements
 Update user the system status
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voltage produced by MFC
Optimum temperature range 20 – 35 C
circuit integrity, for e.g. over-current, short circuit
 Use minimum power to monitor the system
 User friendly
 Components RoHS compliant and lead free
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Monitoring System
Program control logic
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Monitoring System
Program control logic
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Monitoring System
 AVR butterfly kit
 Atmega169 microcontroller
 Low power
consumption: < 500µA
 RoHS compliant
 WinAVR for coding &
compiling
 AVR Studio for
debugging and loading
code
Introduction
Microbial Fuel Cells
Block diagram
Regulation
Monitoring
Feeding/Case
Feeding and Waste System
Food Solution Bladder
Replaced by User Periodically
Anode
Cube
Cathode
Tank
Anode
Cube
Anode
Cube
Anode
Cube
Waste Tank
Emptied by User Periodically
Introduction
Microbial Fuel Cells
Regulation
Monitoring
Feeding/Case
Conclusion
 Achieved Goal of Advancing Existing Designs Toward
Feasible Product
 Future Projects
 Produce Smaller Cube: Fabrication Methods
 Full Testing of Cellophane Membrane
 Platonized Electrodes to Allow Air Cathode
Acknowledgements
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Professor Ray Hozalski, Civil Engineering, University of Minnesota – Twin Cities, for
samples/supplies of electrodes, membranes, and information on MEAs.
Chris Harrington, Graduate Student Researcher, University of Minnesota – Twin Cities, for help
with implementation procedures.
Professor John Wertz, Biology Department, for assistance in Microbiology growth and
experimentation.
Professor J. Aubrey Sykes, Engineering Department, for his ongoing role as the senior design
advisor and for all of this feedback about our project.
Professor Randall Brouwer, Engineering Department, for supplying VHDL code for ADC interface.
Sam Brower, Media Productions Calvin Alum, for various visual design and photographic assistance.
Bob DeKraker, Engineering Department, for logistical support with procurement of circuit
components.
Rich Huisman, Chemistry Department, for assistance with salt bridge supplies.
Lori Keen, Biology Department, for assistance in biological procurement and lab support.
Professor Walter Rawle, Engineering Department and Senior Design Team Mentor, for meeting
with our team and assisting us with the in progress reviews.
Professor Gemma Reguera, Michigan State University, for providing technical information and
expertise.
Questions?