Written Resources

Design Methods Reference Books

"Electronics, Project Management and Design", by D. Joseph Stadtmiller, published by Prentice Hall, 2001.
(Paperback w/ CD-ROM: ISBN 0-13-012729-9)

"Engineering Design Methods", by Nigel Cross, published by Wiley
(ISBN 0-471-94228-6)

"Engineering Design for Electrical Engineers" by Alan D. Wilcox, published by Prentice Hall
(ISBN 0-13-278136-0)

"Strategies for Creative Problem Solving" by H. Scott Fogler and Steven E. LeBlanc, published by Prentice Hall
(ISBN 0-13-179318-7)

Sensors and Instrumentation Reference Books

"Measurement, Instrumentation and Sensors Handbook", ed. John Webster, published by CRC Press and IEEE Press, 1999.
(ISBN 0-8493-8347-1)

"Electronic Instrument Handbook", by Clyde Coombs, published by McGraw Hill, 1999.
(Hardcover: ISBN 0071350160, Paperback: ISBN 007026186)

"Capacitive Sensors", by L. Baxter, IEEE Series on Electronic Technology, 1997.
(ISBN 0-7803-1130-2)

High Speed Design Issues

High Speed Digital Design: A Handbook of Black Magic by Howard W. Johnson & Martin Graham, published by Prentice Hall
(ISBN 0-13-395724-1)

Electronic Automatic Transmission for Bicycle

Tianqi Liu, Ruijie Qi, Xingkai Zhou

Featured Project

Tianqi Liu(tliu51)

Ruijie Qi(rqi2)

Xingkai Zhou(xzhou40)

Sometimes bikers might not which gear is the optimal one to select. Bicycle changes gears by pulling or releasing a steel cable mechanically. We could potentially automate gear changing by hooking up a servo motor to the gear cable. We could calculate the optimal gear under current condition by using several sensors: two hall effect sensors, one sensing cadence from the paddle and the other one sensing the overall speed from the wheel, we could also use pressure sensors on the paddle to determine how hard the biker is paddling. With these sensors, it would be sufficient enough for use detect different terrains since the biker tend to go slower and pedal slower for uphill or go faster and pedal faster for downhill. With all these information from the sensors, we could definitely find out the optimal gear electronically. We plan to take care of the shifting of rear derailleur, if we have more time we may consider modifying the front as well.

Besides shifting automatically, we plan to add a manual mode to our project as well. With manual mode activated, the rider could override the automatic system and select the gear on its own.

We found out another group did electronic bicycle shifting in Spring 2016, but they didn't have a automatic function and didn't have the sensor set-up like ours. Commercially, both SRAM and SHIMANO have electronic shifting products, but these products integrate the servo motor inside the derailleurs, and they have a price tag over $1000. Only professionals or rich enthusiasts can have a hand on them. As our system could potentially serve as an add-on device to all bicycles with gears, it would be much cheaper.

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