156B Week 8

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

• • Implemented and testing valves

  • Laid out code for LCD screen

  • Updated CAD models/cut files for final device

Accomplishments from Previous Week

• • Successfully control two servos independently

  • Valves work properly and analyzed data, determined subsequent valves need further investigation

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

• • Continue testing and analyze data to determine causes of weird valve 2 resistance (Group)

  • Tweak and print cam (Josh)

  • Trouble shoot any issues with code (Jeff)

  • Continue updating webpage as necessary (Basil)

  • Continue working on report draft 2 (Group)

Sponsor 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 5/20

  • Reviewed sensor accuracy

  • Edits to week 8 presentation

  • Weird stuff with valve 2

    • Check sensors by swapping inlets and outlets

    • Choose must trusted flow rate to recalculate valve resistance based on channel 3 data

    • Pressure drops in all channels must be the same by their geometry

    • Check pressure taps to make sure they aren't impeding flow

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 5/15

  • Check sensor accuracy

    • Accurate within 3mm Hg

  • Check resolution by increasing fill density

  • Use lubrication of some kind to reduce friction of pusher (aka linear slide)

  • Check sensor resolution via Arduino

    • Cleaned up circuit by shortening lengths of wires significantly

    • Data is much steadier

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

• • Inability to determine cause of valve 2 resistance plots

    • Further testing needed following sponsor advice

Resources or Information Required but not Available

• • none

Schedule

• • Determine cause of valve 2 discrepancies

  • Tweak cam and print a third valve

  • Implement the LCD to get a readout of the pressure experienced by cells

Budget (list amount spent and amount remaining)

• • Total spent ~$400, ~$200 left

Progress on Report and Webpage

• • Progress on draft 2

  • Website main page updated

  • Internal page updated