156B Week 6

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

• • Design

    • Joint

      • Modified design of transferable joint to interface with Chuy's manufactured cuffs

    • Battery housing

      • Created CAD of battery housing 

      • 3-D printing various lightweight designs

  • Fabrication

    • PCB

      • First version of PCB manufactured and expected to arrive this week

    • Test bed

      • Received torso model from Chuy

    • Harness

      • Will work with Chuy on Friday 5/10 to fabricate brace cuffs and harness

  • Tests

    • Sensors

      • Measured delay from activation of pressure sensor to activation of servo 

      • Avg. delay 200 ms from application of pressure to motor start

      • Avg. delay 500 ms from release of pressure to motor stop

Accomplishments from Previous Week

• • Fabricated model of Max's torso 

  • Re-designed brace joint and confirmed design with Chuy 

  • Initiated process of fabrication of brace with Chuy for this upcoming Friday

  • Ordered first PCB for testing, arriving Friday

  • Re-did wiring on original prototype with breadboard to give 100% rate of success for servo response to Arduino inputs

  • Fabricated prototype sleeve for Max to use - includes two flex sensors and one pressure sensor

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

• • Complete fabrication of harness for left arm only (Jose, Ethan, Marcos)

  • Complete fabrication of brace cuffs for left arm only  (Jose, Ethan, Marcos)

  • Fabricate prototype # 2 - will include fabricated harness, fabricated brace cuffs and test sensor sleeve complete with 3 sensors (Entire team)

  • Test PCB (Jose, Cory)

  • Design new PCB to include circuitry for up to two actuators in the event that we have enough time to fabricate components for the second arm

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

• • Same as last week 4/30 

    • Brace is comfy

      • Glad this is the case. This means design with actuation is feasible and we will continue down this path.

    • Re-do joint connection 

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

• • From meeting 5/2/19

    • Consider switching to PCB 

      • We ordered one PCB to play with and will likely order at least one more that will include connections for two actuators and another set of sensors

    • Think of a way to arrange wiring such that it is compact

      • Will work on that once we get PCB

    • Think about wire management

      • Considering braided wire sleeving to siphon wires along arm

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

• • Harness fabrication 

  • Battery + circuit housing

  • Wire management

Resources or Information Required but not Available

Schedule

• • Describe upcoming milestone

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

Progress on Report and Webpage

• • Continually updating webpage. Need to make it look nicer next week.

  • Report: received comments on report draft. Need to include more figures and analysis in final draft.