156B Week 2

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

• • Manufactured fabric glove prototype to test basic glove layout

  • Manufactured conductive fabric + velostat pressure sensor for testing

    • Will have comparisons on resolution by Thursday

  • Currently comparing functionality of bluetooth module vs Photon wifi module

  • Still researching ways to calibrate the Singletact and Tactilus

Accomplishments from Previous Week

• • Glove prototype

  • Calibration research

  • Bluetooth code library discovery for ESP32 board

  • Sourced and purchased load cell

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

• • Testing of bluetooth module-Michael

  • Sewing Fingercot Prototypes-Kyle

    • Testing tightening mechanism -Kyle

  • Building homemade fabric sensor-John+Kyle

  • Calibrate one pressure sensor - Euan

  • IMU integration - Michael

  • Fabric purchasing - John

  • Preliminary glove/finger cot design - John

  • Schedule hospital appointment for testing communications - Team

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

• • Sponsor was unable to meet last week and we will talk with sponsor on 4/10 and update this section

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 LISTED WERE IN PERSON FROM THE INSTRUCTOR MEETING (4/5)

  • Try using a relative force measured from some benchmark versus an absolute force

  • Look for a good way to calibrate the sensors

    • [ACTION] We are attempting to use load cells to find a benchmark and calibrate sensors

  • Try testing to see if skin softness will impact force results

    • If it does, work on making the glove work for multiple use cases

  • Figure out how many fingers necessary for grasping (particularly regarding endoscopic procedures)

    • [ACTION] We are going to ask Dr. Chang on his personal opinion of which fingers he uses the most to grasp and then perform separate research to figure out how many sensors we will need.

  • Figure out a good way to keep the glove in place

    • [ACTION] We are looking into clips (such as fingertip guitar picks) that can snap onto the finger and hold both the sensor and glove in place

    • [ACTION] We are also considering a lacing design (similar to a baste), as well as a ratcheting system like that used in Boa cycling shoes or even a simple plastic toggle system.

    • [ACTION] We are also likely going to focus on creating a series of finger cots, especially if not all fingers are required. It would also remove a lot of the precision required in making the glove fit multiple use cases.

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

• • [Megan 4/5] Talked about how her own personal experience with finger cots was uncomfortable as they weren’t the proper size

Risks and Areas of Concern

• • Calibration of all finger pressure sensor and determining the impact of sensor drift

  • Would like to laser cut the fabric for a more precise glove outline to sew but some synthetic fabrics will probably melt in the heat

Resources or Information Required but not Available

• • Hospital wireless policies

  • Typical gripping methods of Gastroenterologist

Schedule

• • Slightly behind schedule

    • Unexpected schedule conflicts have delayed our progress

Describe upcoming milestone

• • Design Proposal Presentation

    • Have more robust prototype

    • Finalizing component choice

      • Communications

      • Pressure Sensors

      • Fabrics

Update Gantt chart.

• • No Gantt chart changes for now but will re-evaluate by the end of the week.

  • https://docs.google.com/spreadsheets/d/1aEZ_oX1ZkQF25udTusgZmPybIXVQGj8qxVhNxK864qo/edit?usp=sharing

Budget (list amount spent and amount remaining)

• • Spent: $257

  • Remaining: $743

  • Recent Purchases:

    • Conductive Fabric - $15.67

    • Conductive Thread - $11.82

    • HC-06 Bluetooth module - $7.39

    • 1kg load cell - $8.09

Progress on Report and Webpage

• • Webpage is being reorganized because most of the files are placed in the wrong section

  • Team pictures will taken on Tuesday morning (4/10) with Dr. Chang

  • Team section is also being updated with individual photos and a short bio