# 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.

Laser Harp MIDI Controller with Musical Articulations

Yingxi Hai, Hanze Tu

Laser Harp MIDI Controller with Musical Articulations

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Electronic music concerts usually need eye-catching visual aids to create a certain atmosphere. Laser musical instruments is a great way to do this. We have been thinking of this project for a while and it was ECE445 that made this laser harp come true. The novelty of this project is that the harp-like laser device mainly focuses on playing articulations with laser and sensors, as a true universal MIDI controller, to control timbres that are synthesized or sampled. Articulations include piano/forte, vibrato, tremolo, and portamento. With the help of Professors and TAs, we learned how to pick right the components, design PCB, soldering, and program microcontroller. Those skills are not only useful in this class but also really important to electrical engineers. Also, we learned how to use individual strengths, combined with effective teamwork, in the pursuit of meaningful goals.

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