Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Integrated single valve into device and began testing
Completed first draft of report
Accomplishments from Previous Week
Successfully control a single servo and read pressure sensors and potentiometer with one Arduino
Determined sensors hold their calibration and cause of "walking" was from repeated loading and unloading from starting/stopping the pump
Obtained valuable feedback on our first draft of the report from our sponsor
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Improve upon valve design by supporting the snail cam axle (Josh, Basil)
Write code into setup that will calibrate sensors without the need for user input (Jeff)
Continue working on report and assist others (Obed, Jeff)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
All comments via Zoom on 5/6
Engineering drawings
Should be dimensioned in inches
Add an orthogonal view
Report draft
Executive summary should be a complete summary
Intro should contain motivation and description
Animal models and previous devices are inadequate (motivation)
Background should contain relevant background info
What is currently being used (current devices can't decouple shear and pressure)
Need to be more specific with specifications
"Must be easily operated by someone with no mechanical or electronics background"
Explain why we have two cover slips
Specify size of incubator
Include costs here
Sponsor suggests $5-600 to build a device once the details are finalized
Societal impacts?
Aid scientific community by providing a tool
Aid the affected community by learning about pulmonary hypertension
Ethics
Make sure we reference everything
Will be sending papers from UCSF team our way for reference, be sure to give them credit
Include failure analysis and defects in the device
Include instructions in appendix, might be useful to create a dedicated procedure
Began documenting process for assembling tubing connections
Consider reservoir size
Want to use ~200 mL of medium but it comes in 500 mL bottle
Max is 500 mL per test, medium is expensive
Experiments should also acquire flowrate data to compare resistances
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Comments via Zoom on 5/1 and from comments on presentation (4/29)
Confirm pressure drops across each channel
Global impacts
Tie into healthcare aspects
Stats on # of people affected by pulmonary hypertension
Check hysteresis of valves
Studied this, working on report
Servo shouldn't draw current because it has a high gear ratio such that it is not back-driveable
If we run into issues with the valve do a FBD analysis and try to reduce friction
Soap on the tube, do research for lubricating PLA
Standards section
Protocols for handling cells, get literature from sponsor
Have independent labs verify our results
Suggested putting procedure in appendix
Began writing procedure for assembling tubing
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Comments from email from Anem based on presentation
Everyone liked the figures, easy to understand, huge improvement
Some slides are still text heavy
Suggested highlighting key points
More information on assembly/plan for assembly
Address that it needs to be assembled by people without technical experience
Risks and Areas of Concern
None
Resources or Information Required but not Available
none
Schedule
Finalize and test valve design
Print two more and test a complete system
Draft 2 of report
Budget (list amount spent and amount remaining)
~$350 spent, ~$250 remaining
Progress on Report and Webpage
Draft 1 completed and gotten feedback from sponsor
Updated internal pages, hope to upload more docs by next week about hysteresis and valve evaluation