This week, I was mainly working on the Design Review. I was responsible for the main platform design and rotational mechanism. On top of working in parallel with other team members on the Design Review Presentation and Design Document, I was mainly responsible for ordering project components. From the Design Review Presentation, we did a tradeoff analysis and ended up with different project components that we need. From that, I started doing research on different suppliers and models of the components we need to get the most cost-efficient ones while getting the most appropriate shipping time. Below is a table of the project components we ordered this week.
| Ordered | Item | Quantity | Unit Price | Total Price | Shipping Cost | Total Cost | Description | Expected Shipping |
| Yes | Nema 23 Stepper Motor | 1 | $23.99 | $23.99 | $0.00 | $23.99 | 2 Days | |
| Yes | 15 Inch Wooden Circle | 1 | $14.99 | $14.99 | $0.00 | $14.99 | Plywood for platform | 2 Days |
| Yes | Lazy Susan Bearing | 1 | $27.19 | $27.19 | $0.00 | $27.19 | 2 Days | |
| Yes | Acrylic Plexiglass Sheet, Clear | 1 | $9.98 | $9.98 | $0.00 | $9.98 | Laser cutting for Internal Gear | 2 Days |
| Yes | STEPPERONLINE CNC Stepper Motor Driver | 1 | $38.99 | $38.99 | $0.00 | $38.99 | Motor Step Driver | 2 Days |
| Yes | Neoprene Sponge Foam Rubber Sheet | 1 | $14.80 | $14.80 | $0.00 | $14.80 | High-friction surface | 2 Days |
| Yes | Adafruit Line Laser Diode (1057) | 1 | $8.95 | $8.95 | $8.99 | $17.94 | Projected Laser Stripe | 2 Days |
| Yes | Webcamera usb 8MP 5-50mm Varifocal Lens | 1 | $76.00 | $76.00 | $0.00 | $76.00 | 2 Days | |
| Yes | Nvidia Jetson Nano Developer Kit | 1 | $99.00 | $99.00 | $18.00 | $117.00 | 3-5 Days | |
| Yes | 256GB EVO Select Memory Card | 1 | $42.96 | $42.96 | $0.00 | $42.96 | MicroSD card for Jetson with Reader Bundle | 2 Days |
| Yes | MicroUSB Cable (1995) | 1 | $9.00 | $9.00 | $8.99 | $17.99 | MicroUSB cable for Jetson | 2 Days |
I did not include the sources and full names of the components in the table above. For full details, please visit https://docs.google.com/spreadsheets/d/1AP4Le1eVNL51T8ovUJb9YF-H2u47EvRG4AHWqp7ULIM/edit?usp=sharing
This comes up to a total price of $401.83 including shipping. (This is the maximum cost. If we are able to order both items from DigiKey together then it would be $392.84 instead). This gives us at least $198.17 left in case we need other parts. We will still need to order wood for support of the platform later and some of the budget could be used if the laser we ordered doesn’t have the light intensity we need.
I’m still a little behind schedule since I ordered the parts later than what our team planned for. Our team compensated for this by moving up other tasks that could be done without the parts up the schedule. We’ll be working on those tasks while waiting for the parts to come.
As my work is mainly related to the project parts we ordered, for next week, I hope to get the parts by Thursday and started performing basic testing on them before leaving for Spring Break. While waiting for the parts during the beginning of the week, I also hope to help Alex write some testing benchmarks.