Project

# Title Team Members TA Documents Sponsor
38 E-Bike Conversion Kit with Regenerative Braking
 Chloe Armstrong
Jace Haas
Lucas Pruett
 Matthew Qi design_document1.pdf
design_document2.pdf
final_paper1.pdf
photo1.jpeg
photo2.jpeg
presentation1.pptx
proposal1.pdf
proposal2.pdf
video1.mp4
# E-Bike Conversion Kit with Regenerative Braking

Team Members:
- Jace Haas (jaceh2)
- Lucas Pruett (lpruett3)
- Chloe Armstrong (chloeca2)

# Problem
Electric bikes can provide both a greener alternative to cars and a faster alternative to bikes. However, current electric bike designs are not without fault. One current problem with electric bikes is their limited range. The average electric bike will only allow riders to travel around 20-40 miles from their stopping point. For some, range is too low to justify purchasing an electric bike. Furthermore, ebikes on the market that have regenerative braking cost upwards of $1000-$2000, which isn’t affordable for most people.

# Solution
One solution to this problem is regenerative braking. Regenerative braking on electric bikes has been shown to, on average, provide a 2-15% boost in range. Even higher range boosts have been observed in more extreme cases of hilly, stop-and-go routes, or when the rider is carrying heavy cargo. Not only does regenerative braking allow for a boost in range, but it also cuts down significantly on brake maintenance. When normal brakes are only needed in case of hard stops, brake wear is significantly reduced. Our idea is to provide an economical and modular option to electrify pre-existing bicycles. The final product will be versatile and flexible. The system will provide throttle motor drive, regenerative braking, and collect data in order to troubleshoot and to measure the range increase from braking.

# Solution Components
## Subsystem 1 - Motor Control
The motor control subsystem takes input from the control unit and modulates motor speed. It is also responsible for controlling regenerative braking.
Example motor:
https://ebikeling.com/collections/ebikeling-ebike-wheels-with-motor-ebikeling-ebike-conversion-kit/products/waterproof-36v-500w-26-geared-front-rear-ebike-motor-wheel-only?variant=32465545429058

Example motor control:
amzn.to/3jcSAMu

## Subsystem 2 - Battery
The battery subsystem takes input from the control unit and modulates battery output and input as needed without damaging the battery or overcharging.
https://www.vladsmall.com/product/48v-20ah-13s3p-18650-electric-bicycle-lithium-battery-bms-for-ebike-electric-vehicle-electric-motorcycle-with-charger/

Lipo cell:
https://www.vladsmall.com/product/48v-20ah-13s3p-18650-electric-bicycle-lithium-battery-bms-for-ebike-electric-vehicle-electric-motorcycle-with-charger/

## Subsystem 3 - Control Unit
The control unit subsystem takes inputs from throttle and brake, and communicates with the other two systems. It could also be used to handle data collection, which would be useful for testing and troubleshooting. We will plan on designing a PCB for this subsystem. A microcontroller can be used for data collection.

Proposed micro controller chip: https://www.microchip.com/en-us/product/ATmega328P


# Criterion for Success
This unit should be able to increase the range by 5% in a city environment.
Controls should allow for regenerative braking systems to be engaged before manual braking.
This unit should be cheaper than available e-bikes with regenerative braking. (<$1500 including bike)


Extra goals
- Dashboard for data display
- Odometer, speedometer, lights
- Variable regenerative braking strength

Assistive Chessboard

Robert Kaufman, Rushi Patel, William Sun

Assistive Chessboard

Featured Project

Problem: It can be difficult for a new player to learn chess, especially if they have no one to play with. They would have to resort to online guides which can be distracting when playing with a real board. If they have no one to play with, they would again have to resort to online games which just don't have the same feel as real boards.

Proposal: We plan to create an assistive chess board. The board will have the following features:

-The board will be able to suggest a move by lighting up the square of the move-to space and square under the piece to move.

-The board will light up valid moves when a piece is picked up and flash the placed square if it is invalid.

-We will include a chess clock for timed play with stop buttons for players to signal the end of their turn.

-The player(s) will be able to select different standard time set-ups and preferences for the help displayed by the board.

Implementation Details: The board lights will be an RGB LED under each square of the board. Each chess piece will have a magnetic base which can be detected by a magnetic field sensor under each square. Each piece will have a different strength magnet inside it to ID which piece is what (ie. 6 different magnet sizes for the 6 different types of pieces). Black and white pieces will be distinguished by the polarity of the magnets. The strength and polarity will be read by the same magnetic field sensor under each square. The lights will have different colors for the different piece that it is representing as well as for different signals (ie. An invalid move will flash red).

The chess clock will consist of a 7-segment display in the form of (h:mm:ss) and there will be 2 stop buttons, one for each side, to signal when a player’s turn is over. A third button will be featured near the clock to act as a reset button. The combination of the two stop switches and reset button will be used to select the time mode for the clock. Each side of the board will also have a two toggle-able buttons or switches to control whether move help or suggested moves should be enabled on that side of the board. The state of the decision will be shown by a lit or unlit LED light near the relevant switch.

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