156B Week 5

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

• • Fabrication and Testing

  • Validating components (sensors, mounts, raw material transport aka ramp)

Accomplishments from Previous Week

• • Tested ultrasonic sensor

  • Prototyped tab-screw mechanism

  • Grinder control with SSR + mass vs. time graph for grinding

  • Cut grinder to prepare mounting

  • Ensured power supply works

  • Tested valve operation

  • Built tabbed screw mechanism

  • Determined how water kettle shuts off

  • Ordered additional parts

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

• • Assemble 8020 + mount modules unto it

  • Control water heating

  • Grind coffee for a fixed time

  • Validate (and improve) tab-screw mechanism (printing material, watertight coating)

  • Updated electrical schematic + process schematic

  • Control pumps with Arduino

  • Convert breadboard circuits to perfboard

  • Establish Arduino code framework (global variables, pin assignments and loop structures)

  • Calibrate thermocouple

  • Assemble heating module

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

    All comments made over phone 1/31/19

• • Try IR and ultrasonic (sent video of ultrasonic working)

  • Have frame assembled and all modules mounted by 2/14

  • Try two-way valve if emptying the line is a problem

  • Liked the idea of cutting down the QD threads

  • Update electrical schematic

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

    All comments made in person 1/29/19

• • Use metric for ½’’ tubing too

  • Want to use protoboard instead of PCB since its more user-compatible

  • Check out RTD (Steve said to consider thermister)

  • Experiment w hot water cooling down as it flows through cold tubes

  • Test water temp measurements

  • Implementing a fill sensor: IR, ultrasonic, or float?

  • Reduce size of QD assembly, try to use the Mcmaster part instead of designing form scratch

  • How to clean inside of tubing? Consider the T or Y valve (could add a 3rd pump)

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

• • After assembly, we still need to check whether we meet the height requirement for gravity feeding grinds; otherwise need to design custom bean hopper

Resources or Information Required but not Available

• • N/A

Schedule

• • Assembly of modules into 8020 frame (wk5-6)

  • Validation of components (wk5-6)

  • Make a cup of coffee (end of wk6)

Budget (list amount spent and amount remaining)

• • Spent: $416.85

  • Remaining: $3,083.15

Progress on Report and Webpage

• • Report

    • Chapter 3: Design of Key Components in progress

    • Chapter 4: Prototype Performance in progress

  • Website

    • "Team" page done

    • "Home" page in progress