156B Week 5

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

• • Rig Design has been approved by sponsor to begin purchasing components

  • Proof of concept models built to increase understanding of designs and sensors used

Accomplishments from Previous Week

• • IMU and Hall sensors running on Raspberry Pi

  • Updated CAD

  • Ran FEA on rig

  • Closed-cell foam samples arrived

    • We’ve decided against using these

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

• • Analog-to-digital conversion (Aryo)

    • The sound card we ordered is DAC only, we need a solution for ADC for recording audio (dolphins emit up to 160KHz)

      • Hydrophone interface is BNC

      • Build ADC vs buy soundcard with ADC and DAC

  • Finalize bill of materials for rig (Julia)

    • Order 80/20, PVC, stainless steel, hardware

  • Finalize decision on hall effect sensor and order (Tristan)

    • Planning to order from Sensor Solutions Corp, their hall effect switches are waterproof and made to order (10 day max lead time guarantee)

      • They also source magnets (OTC), planning on buying a variety (they are inexpensive) to leave our options open

      • Hall effect sensor can be ordered before magnets

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

• • Adjusted height of rig in response to sponsor’s emailed request (2/6)

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

• • Designed biteplate utilizing springs instead of foam (2/2)

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

• • ADC for recording

    • Sound card is DAC only, we currently have no way of interfacing with hydrophone output

    • Can’t find an off-the-shelf solution specifically for RPi with the proper frequency specs

      • Considering building our own, there are tutorials on Adafruit where it’s done with an inexpensive ADC chip and some wires, not sure how feasible this really is

  • Hall effect sensor mounting in biteplate

    • Incorporate somehow with hard-stop?

Resources or Information Required but not Available

• • N/A

Schedule

• • Order materials for rig by end of week

  • Order hall effect sensor by end of week or sooner

  • Order new sound card (if we decide to go this route) by end of week

Budget (list amount spent and amount remaining)

• • $137.35 spent

  • $862.65 remaining

Progress on Report and Webpage

• • Applicable standards added to report