ECE 191: Project 5 Ocean Bottom Attachments

1
ECE 191 Project 5Ocean Bottom Attachments

• Sponsor Spawar
• Mentor Tom Tucker
• Members Steve Walsh, Robb Raffaelli, Ying Yu
  (Eric) Deng, Greg Kovell

2
Agenda

• Met with mentor on Oct 13th
• Budget
• New research on current sensors
• Design of comparator for output voltage sensor
• Gantt Chart
• Summary/Goals

3
Meeting with mentor

• Focus on the sand/silt application
• -- BYU group working on hard surface
  attachment
• Create budget
• Demo set up for Wed 10/22
• One battery for unit
• --use of voltage dividers
• Save money by using existing prototype

4
Budget

• Worst Case
• Submersible pump Rule 12V, 2A, 500 GPH, 20
• Salad bowls for spherical housing, 25
• Batteries (dry cells), 25
• 2 33 gallon trashcans, 40
• 3 bags of playground sand, 5 each (50 lbs.
  each)
• Diatomaceous earth (silt/sediment), 45 (50
  lbs.)
• -- Looking into other sources of sediment
• Current sensor (CUI Inc. model SCD), 14
• Comparator
• Best Case
• Availability of the prototype eliminates all
  costs other than the current sensor and other
  electrical components

5
New Research on Current Sensors

• Open loop current sensors
• -- preferred in battery powered applications
• -- price advantages over closed loop
• -- lower power consumption
• Available current sensors
• -- CDI Inc. model SCD
• -- Open loop Hall Effect sensor
• -- Small, power efficient
• -- Overload shutdown

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Design of Comparator
This is a basic example of a comparator that
may be useful. -- Threshold voltage can be set
after determining the approximate operating
output voltage of the pump After determining
circuit noise, a different circuit may be
utilized to minimize the noise -- The resistor
values will vary depending on the output voltage
from testing
7
Gantt Chart
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Summary/Goals

• Met with mentor 10/13
• Meet with SIO rep 10/17
• Submit budget to mentor
• Finalize current sensor approach and order parts
• Begin testing prototype