Project

#	Title	Team Members	TA	Documents	Sponsor
20	BikeBike Revolution: Energy Efficient E-Bike	Gina Jiang Shannon Lin Yee Chan Kim	Bonhyun Ku	design_document1.pdf design_document2.pdf final_paper1.pdf presentation1.pdf proposal1.pdf
	Team Members: Shannon Lin (slin81), Daniel Kim (yck2), and Gina Jiang (gjiang20) # Problem Indoor exercise is largely popular in today's time, especially during the current pandemic, and many products have been doing well such as the Peloton bike. An advantage that can be taken to the next level would be to have the indoor stationary bike become a bike generator, which is then able to turn that energy and power the motor for an E-Bike. This would overall optimize energy and also encourage bike enthusiasts to stay active efficiently, no matter the weather or circumstance. # Solution Overview Our solution is to allow an E-Bike to convert into an indoor stationary bike, and to use the energy generated from pedaling indoors to power the E-Bike for use outdoors. The amount of energy generated after pedaling for an hour is about 80 Wh, while the average E-bike is rated between 300-1000 Wh. This amount of power can be feasible in an electrically-assisted bike. We would also want to implement a multi-input system to allow the battery to be adapted to the grid. There will be an indoor stand/station to support the bike for safe use indoors, which would also be modified to fit the motor/generator, and there will be a battery mounted on the bike’s frame. Power electronics will also be included on the bike frame itself. # Solution Components Subsystem #1: Generator and Motor (hardware) A motor can be modified to be also used as a generator, allowing it to both power the bike on the road and charge the battery when the bike is being pedaled. A torque sensor will be used to determine how much torque is applied on the pedal so that the motor can be supplied with more power when the torque is greater. Subsystem #2: Power Electronics (hardware) AC power source - the bike should be able to input power from the grid, which would require a rectifier on the PCB to charge the battery. This can be a plug and play design so that the bike can be powered quickly. DC power source - DC motor and battery, including a DC-DC power converter such as a buck or boost converter depending on the specs of the battery and motor / generator input and output rated voltage A switch may be implemented to differentiate between when the motor should be supplying power and when the generator should be charging the battery. Subsystem #3: Control System (software / hardware) Controls can be implemented digitally through an Arduino to regulate the motor / generator expected input and output to the battery. We plan to use a PID controller in the Arduino system. The control system circuit can also be integrated into the PCB design of the project. # Criterion for Success Our criterion for success would be to have the E-Bike output at least 300 Wh of power, thus having the generator be able to meet this requirement as well as successful battery storage capability. The other criteria would be to have the bike be compatible with obtaining power from the grid, which means a working AC-DC power converter on the bike. With the end product, the user should be able to ride the bike indoors / charge it, then take it outside and use the electrically assisted feature.

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.

Project Videos