156B Week 4

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

• • Finalizing Dome Structure design

  • Finalizing component purchasing

  • CAD of Protobox

Accomplishments from Previous Week

• • Contacted Mccmaster-carr to purchase raw material for dome 

  • Purchased two solenoid,  1 4X16 serial text OLED, 20 transistors, 2 photo screw shields, 8 buttons,and 2  Piezo Beeper  through our UCSD budget

  • Our sponsor purchased to ceramic pumps with one controller, 6 solenoids,  14" diameter x 3" thick acetal copolymer rods - 3 units, two Arduino Mega's, and will be purchasing a digital pressure gauge

  • contacted protoboard to have a ruff estimate how long it will take them fabricate our user interface (1week)

  • created a closed loop system using 5 gallon water bottles with a split line to see if height displacement between dome and sampling area affect the flow rate

  • began the partial construction of the system circuit

  • Tom and Jack both agreed with the idea that Professor Delson and a few classmates about placing pins around main dome and using them to place a shield on top and being able to lock it. They both liked it and were are now planing on applying it to one of our designs

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

• • Rudy- construct a closed loop system using a 5 gallon water bottle to simulate the dome and attach two solenoids to this close loop. Then test to see if when the valve is open, if water flows out. also test to see if air is not allowed in, will this create a vacumm

  • Zhen- once all the electrical parts arrive this week, help Rudy construct the circuit and begin programming the system

  • Dimitri- once rudy and zhen have finished constructed the circuit, order the user interface through protobox, also begin the fabrication of two different Dome ideas with the help of Jack and Tom

  • Yoav- assisting Dimitri with ordering products, circuit board construction with Rudy and Zhen, and help Dimitri with the fabrication of the Dome

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

• • likes both of our concepts and gave of us the OK to begin constructed both for testing

  • Ceramic pump and its controller is far to expensive so decided to only order 2 instead of 5

  • suggested we use acetal copolymer for the construction of the Dome instead of polycarbinate

  • ordering  major components for us, such as, Ceramic pumps, 6 Solenoid Valves, 2 arduino megas, raw material for Dome construction (Acetal copolymer)

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

• • Present design project to sponsor and pick one or two concepts

  • Recommended using a locking mechanism around dome to place shield

  • Specify problems with manually measured sample size, time, lie, and consuming?

  • Does air really screw up data? will the sample collection bottles have air in them? will this cause problems?

  • is there a volume conservation problem in design #1? If you remove some water and do not allow air in- will this cause a vacuum?

  • How will stagnate water cause problems in manifold for Design #1

  • Suggested the use of tapped holes to mount and remove outer shell

  • recommended using a pressure traducer instead of an electrical pressure gauge

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

• • Dan and others- recommended the same idea as professor Delson regarding using pins around the main dome and using them as a locking mechanism

Risks and Areas of Concern

• • Make sure there are no trace metals on solenoid valves and ceramic pumps (will be tested at Spawar)

  • Make sure that water flows out of each dependent solenoid when open

  • designing the PCB on time

  • make sure that air does not create a vacuum

  • Double check to see if stagnate water makes a huge difference on sample

  • determine how to control the ceramic pump (make sure it gives us the exact volume we want per sample)

Resources or Information Required but not Available

• • code for the ceramic pump

Schedule

• • test out our system with solenoids

  • wait on electrical components (this week) to begin designing circuit and begin programming

  • wait on raw acetal copolymer ( once here take it to the machine shop and begin constructed it with the aid of Tom and Jack)

  • Once circuit is constructed have Steve Roberts double check our work, if OK. Have PCB sunset manufacture it

  • Attain the dimensions of circuit board and design user interface through protobox program, then send out to them

  • program all parts to work synchronized 

  • determine if a pressure traducer will work for our system, if so, how it works  and how to code it

Budget (list amount spent and amount remaining)

• • $ 27 at Home Depot for raw material

  • $ 700 solenoids (external budget)

  • $ 98.58 electrical components

  • Left: $100.28 (however we will be getting refunded for both solenoids and amount left will be 800.28)

Progress on Report and Webpage

• • updated