156B Week 8

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

• • Began testing using Dr. Chen's TED instead of commercial TED

    • implemented successfully, but controller requires tuning (to be optimized for Dr. Chen's TED instead of commercial TED)

    • can both cool and heat using phone input (bidirectional control from driver board)

  • Armband cloth casing manufactured

  • Filter circuit built; testing in progress

  • Awaiting resistors for RTD circuit

Accomplishments from Previous Week

• • Ordered all parts for RTD circuit with most of them arrived (awaiting resistors)

  • Completed fabrication of armband cloth

  • Decided on using 2 separate enclosures for electronics

  • Decided on using Velcro to attach enclosures to the armband

  • Performed thermal analysis and decided to not attach fins to convective side of TED

  • Successfully integrated Dr. Chen's TED to replace the commercial TED

    • Directional control working using driver board

    • controller requires tuning to be optimized for Dr. Chen's TED instead of the commercial TED

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

• • Adjust code for reverse operation after H-bridge is implemented into circuit (Justin)

  • CAD entire model with all components in enclosures (Justin)

  • Purchases:

    • enclosures or order 3D printed ones (Tom)

    • Velcro for attachment of enclosures (Kam)

    • mini breadboard for RLC filter, H-bridge, and RTD circuits (Tom)

    • silicone paste for TED interface (Tom)

  • Tune current controller to be optimized for Dr. Chen's TED (Tom, Kam)

• Test entire setup portably (i.e. in armband, without computer connection) (Tom, Kam)

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

• • Using silicone coating on TED is okay with sponsor (5/16, via email)

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

• • Increase integral and derivative terms to reduce steady state error without more overshoot (5/11/20, via zoom)

  • Use thin coating of silicone or gel as the interface between TED and skin (5/11/20, via zoom)

  • RTD circuit recommendation (5/11/20, via zoom)

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

• • None

Risks and Areas of Concern

• • Concerned about acquiring enclosures for the electronics to put into the armband (i.e. acquiring enclosures of custom dimensions quickly)

  • Concerned that final product will be larger than anticipated due to multiple batteries required

    • batteries for the Arduino, driver board, RTD circuit, and filter circuit

Resources or Information Required but not Available

• • None

Schedule

• • Describe upcoming milestone

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Spent: $533

  • Remaining: $1467

Progress on Report and Webpage

• • Updated all sections of report and webpage for second draft submissions