156B Week 8

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Power generation improved to charge the capacitor quicker

  • Handle CAD design finished but might need minor adjustments

  • Heads CAD started but still in progress

  • First prototype done (using the existing handles) 

Accomplishments from Previous Week

• • New LED lights were purchased and tested for brightness

  • Power generation completed and improved to charge up the capacitor quicker

  • Power generator optimized to be small but still effective

  • Handle was 3D printed

  • Report updated

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Finish CAD design of heads

  • 3D print the heads

  • Fit and stabilize the circuit and power generation into the handle

  • Make necessary adjustments to the handle for a more comfortable grip

  • Work on report's draft

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • During meeting on 5/16:

    • If it is feasible, make a dial switch to change the intensity of the lights

    • The size of the handle is now acceptable

    • Make the design so even the physicians who hold the otoscope the "wrong way" can still use it 

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Talk to Steve Roberts for help with soldering, circuit board, and switch

    • Obtained small circuit board as well as high quality soldering on the rectifier. Also obtained a 2-state switch (on-on).

  • Measure the power output per shake and how long it will take to charge the capacitor

    • Performed test with power generator connected to rectifier and capacitor, then used oscilloscope to visualize the charge in the capacitor while shaking the device

  • Do a full test with a resistor and an LED (see if we can potentially not use a resistor)

    • Tested purchased LED's as well as existing scopes to see how bright and how long the LED's can be on using our capacitor

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • N/A

Risks and Areas of Concern

• • Finding ways that the magnet does not get attached to the capacitor

  • Still improving on power generation to reduce shake time

  • Using dampeners that are more effective but do not take much space

Resources or Information Required but not Available

• • N/A

Schedule

• • Second draft due 5/25

  • Test the first prototype and make necessary adjustments (5/22)

  • Finish heads' CADs (5/25)

  • Fit the optics into the head housings (5/27)

  • Assemble the final prototype (5/28)

Budget (list amount spent and amount remaining)

Progress on Report and Webpage

• • Report: 50%

  • Webpage: 25%