Siyuan Hu's Techie Blog

Drummy Introduction Drummy is a portable musical instrument incorporating a drum sequencer that is extremely simple and easy to use. It is designed as a mini controller for kids to get familiar with basic tempo in drumming and develop a better sense of rhythm. It has a slick and clean look with comfortable light-emitting silicone buttons that can easily catch the kids' attention. Team Members Siyuan Hu: CS Major NYU '17 Zack Kimelheim: CS/French Major NYU '18 Main Parts 16 LEDs 4 potentiometers 4 decorative caps for potentiometers 1 Leonardo microcontroller board 1 Trellis board a few wires for soldering 3D-Printing for Drummy We decided to 3D print the enclosure case for our final project. There are 4 design pieces (base, frame, tray, lid) that house the components and keep them secured with machine screws. The Arduino is mounted to the bottom cover with 4 screws. 4 potentiometers are mounted to the top panel and secured in place.

Soldering We soldered 16 LEDs to the Adafruit Trellis board and tested them with an Arduino program. Assembling Later we embedded the Trellis board into the project box that we made earlier, and soldered the four potentiometers simply in series.

3D Printed Project Box We used a 3D printing machine in Leslie Lab to make our project box. The machine was fairly easy to manipulate and the instructions were straightforward. It took over 10 hours in total to print out all the parts of the box. We finished assembling the parts after the printing was completed. One thing to improve: We actually printed the frame part and bottom part twice because during the first printing, we manually modify the design files to stick them together so that we thought it would reduce the printing time. However, that sort of changed the original height setting and the assembled box was shallower than expected. During the second printing, we printed those two parts separately and everything worked out perfectly. Here are some photos: