156B Week 9

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

• Heating

  • all three elements 

  • needs to be wired together

• Valve

  • mount, 3D printed arm

  • all parts work, now have to work in conjunction with the rest of the parts

• Stirring

  • Mechanical parts working

  • Motor/wires needs housing

  • Tipping limits with added height

• Controls

  • have circuit diagrams, waiting for relays to come in mail

Accomplishments from Previous Week

• Heating

  • tried different types of insulation 

  • decided to go with blanket type insulation that is foil-backed (high-temp rated)

• Valve

  • solenoid controlled arm tested

  • readjusted the mount

• Stirring

  • Stirrer dimensions, designing/machining new casing

  • motor test run at high temperatures with the heating elements on

• Controls

  • talked to Steve about relays and created circuit diagrams for all heating elements and arduino

    • obtained mofsets from steve

    • waiting on getting proper relays (the ones we got initially were electromechanical not solid state relays)

  • got temperature sensors

    • got them working with arduino library

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

• Heating (Shahin)

  • needs to be integrated so it doesn't knock around inside when handling

    • immersion heater fixed on the inside wall

    • heating pads attached to insulation acting as a spring so that constant pressure is on the brewing container

    • flow-through horseshoe shaped heater (already attached to coffeemaker normally)

    • roll cage around the immersion heater to avoid contact with the wall

  • integrate temp. sensors

• Valve (Arun)

  • Ways to integrate filter in the brewing container and the container gate vale

  • Sturdier support for the solenoid

  • Integrate filter into brewing container

• Stirring (Ian)

  • Machine stainless steel box to satisfy the tipping standards and to fit the motor and wires

  • Machine aluminum rod which will be press fit and will house the magnets inside

  • Look for a kettle with a flat bottom and no metallic parts

• Controls (Soo)

  • wire relays and test circuit diagram

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

• 2/27

  • Redirect focus to more immediate and higher priority goals (gate valve automation, temperature sensing)

  • Discard time-controlled automation and develop temperature sensing controller

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

• use solid state relays and MOSFET for AC control; worked with Steve Roberts to get schematic

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

• (during final presentation review)

  • consider putting specific numbers that are mentioned while speaking onto slides for clarity

Risks and Areas of Concern

• Time constraint for developing time controlled system on week 9

Resources or Information Required but not Available

Schedule

• • Milestone: finish entire product

Budget (list amount spent and amount remaining)

• $570 spent, $430 remaining

Progress on Report and Webpage

• exchanged reports with other team for corrections

• adding more to webpage when final product is done