156B Week 6

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

• • The pressure housing motor interface is being redesigned with a potential flexible coupling between motor shaft and threaded rod shaft

  • The internal housing unit was conceptualized as a cylindrical foam insert which will then separate into halves to contain the electronics components

  • The RTC breakout board has been ordered; the prototype circuit will be put together

  • The PCB design will follow in parallel to the prototype in order to establish proper connections between components

Accomplishments from Previous Week

• • Proof of Concept Presentation was given

  • Biofouling test articles were deployed

  • First draft of report and website submitted

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

• • Assemble a complete prototype with all functional components integrated into one unit (All)

    • Create a pressure vessel with motor attached to rod and gland assembly (Alvin and Matthew)

    • Create an electronics circuit which will drive the motor and keep track of time (Mike and Katherine)

    • Create and internal housing unit by testing the foam idea (All)

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

• • Suggested looking into the possibility of taking temperature measurements once per day during the wake up cycle of the circuit

  • No preference between having a stock Arduino interface with a separate PCB or having a fully integrated single PCB

    • Emphasized the necessity for user-friendly design which is simple enough to setup and reuse

  • Suggested talking to contacts at SPAWAR who have experience in PCB design

  • Provided example of previously used buoy dynamics code

  • Handed off 3D printing plastic to group for payment to school

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

• • Expressed concern for method of installing shaft into watertight gland (27-Apr-2015 during presentation)

    • Chamfering the rod edge will be tested

  • Mentioned that not all batteries will be at the actual rated capacity when used (27-Apr-2015 during presentation)

    • A decent factor of safety will be employed; one-time use batteries are being considered

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

• • Asked if condensation forming in the vessel has been considered (Zachary Beverage 27-Apr-2015 during presentation)

    • Desiccant will likely be employed to prevent the effect of condensation

Risks and Areas of Concern

• • N/A

Resources or Information Required but not Available

• • N/A

Schedule

• • Group meeting at 1:00PM (4-May-2015)

  • Meeting with instructor at 4:00PM (4-May-2015)

  • Meeting with sponsor at 3:30PM (8-May-2015)

Budget (list amount spent and amount remaining)

• • $575 spent

  • $425 remaining

Progress on Report and Webpage

• • First draft of report submitted (1-May-2015)

  • First draft of webpage completed (1-May-2015)