# Title Team Members TA Documents Sponsor
53 Multistage coil gun part 2
Area Award: Teamwork and Collaboration
Alejandro Esteban Otero
Changkun Li
Theodore Culbertson
Jackson Lenz design_document0.pdf
Our project is a continuation of the coil gun project that was started by Jonathan Dagdagan, Shashvat Nanavati, and Yohan Ko in 2013. They were able to build a three stage coilgun and fire it successfully, but the project still had several issues that need to be addressed. To begin with, the SCR cannot handle the voltage put across them during firing. We must find a way to reduce the stress on the SCR, or they will have to be replaced after every firing. We have thought about implementing an isolation transformer to achieve this goal. In order to reduce the current stress of the SCRs we would study the behavior of the circuit when adding SCRs in parallel for each transformer.

To increase the speed of the projectile and prevent the SCRs from blowing up we would include a diode and a resistance in parallel with the coils so that the energy stored in the inductor is dissipated quickly. We also intend to add several features to improve usability, including displays to show the speed of the projectile and charge of the capacitors.

Once the coil gun can be test fired reliably, we will do simulations and collect data to maximize the velocity of the projectile by altering placement of the coils and timing of the triggers.

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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