CS-EE Project Auto-Shifting Bicycle Team Shortnose Sucker Authors Tim Slevin-Vegdahl Joan Javier Cyrus Medrano Brendan Figuly Founder’s Day University of Portland School of Engineering Advisors Dr. Robert Albright, Dr. Peter Osterberg Industry Representative Mr. Walter Harrison

CS-EE Agenda Introduction Joan Background Tim Methods Brendan Results Team Sucker Conclusions Cyrus Demonstration Team Sucker Founder’s Day University of Portland School of Engineering

CS-EE Introduction Problem: Many bicyclist are not aware of how to efficiently shift gears when riding a bicycle Bicycle safety is an issue and deciding when to shift gears could be a distraction Solution: Automatically shift the gears of the bicycle Founder’s Day University of Portland School of Engineering

CS-EE 481 4Founder’s Day University of Portland School of Engineering

CS-EE Background Information Best crank speed between 1.4 and 1.6 revolutions/second for efficiency and comfort. Lower gears give more force but allow less speed. Founder’s Day University of Portland School of Engineering

CS-EE Background Key Functional Specifications Shifts Automatically between three discrete gears on a bicycle. Automatic shifts occur in less than 1 second Decision to shift or not happens every 2.5 seconds Founder’s Day University of Portland School of Engineering

CS-EE Methods -Describe how we completed the project -Separate responsibilities -Competency in all areas -Technical and logical project steps -Frequent testing and evaluation -All procedures followed standard engineering practices -Recording data in notebooks, consulting advisors and maintaining regular updates Founder’s Day University of Portland School of Engineering

CS-EE Methods MOSIS CPLD –ABEL –Verilog PIC18LF452 Founder’s Day University of Portland School of Engineering

CS-EE Results Founder’s Day University of Portland School of Engineering

CS-EE Magnetic Sensor CATEYE MITY 8 Reed switch Magnets mounted on rear wheel Switch closes when magnet passes sensor and outputs a +5 volt pulse Founder’s Day University of Portland School of Engineering

CS-EE PIC Microcontroller PIC18LF452 programmed with ICD 3 module Counts the amount of +5 volt pulses from magnetic sensor Compares the current speed to the predefined speeds that were calculated for each gear Triggers the stepper motor if a shift up or down is needed Displays current gear in binary Founder’s Day University of Portland School of Engineering

CS-EE PIC18LF452 Founder’s Day University of Portland School of Engineering

CS-EE Stepper Motor Founder’s Day University of Portland School of Engineering

CS-EE Conclusions We learned how to integrate several different technologies, as well as gained experience with new ones: –Magnetic Sensor, MOSIS, CPLD (ABEL/Verilog), PIC, Stepper Motor Future improvements would include: –Full system mounted –Wireless interface Project was a success, met all requirements Founder’s Day University of Portland School of Engineering

CS-EE Special Thanks Dr. Robert Albright Mr. Walt Harrison Dr. Peter Osterberg MOSIS Educational Program (MEP) Grant Dr. Timothy Doughty Dr. Wayne Lu Founder’s Day University of Portland School of Engineering

CS-EE Demonstration Founder’s Day University of Portland School of Engineering

CS-EE Thank You. Are there any questions? Founder’s Day University of Portland School of Engineering