156B Week 6

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

• • IMU sensors are almost ready for deployment; few bugs here and there

  • An online live interface for the data to be displayed is being constructed

  • PCB design is sent out to manufacturer for fabrication. ETA 1.5 weeks

  • 15mm Pressure sensor arrived and approved by Dr. Chang.  

  • Feedback sensors have been chosen and continuing integration

Accomplishments from Previous Week

• • IMU is able to tell the angle relative to a stationary angle. (Other IMU was MIA but has been recently found so testing for IMU to tell angle relative to other IMU is underway)

  • With the help of Michael Smith, CS undergrad, we were able to set up an online webpage that will broadcast the data of the sensors. Right now it contains a dummy graph.

  • A haptic feedback motor (vibration motor) has been tested and has shown impressive vibration strength. Dr. Chang approved it so another one has been purchased for the other arm

  • 1M ohm potentiometer has been purchases to determine optimum pull up resistor value to achieve the desired resolution of the finger pressure sensor

  • An updated CAD for the case of the IMU and vibration motor has been designed and will be 3D printed with TPU (flexible) filament)

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

• • Finalize the IMU to be able to tell angles from the other IMU (Michael)

  • Improve online interface to send the data of sensors into the page (Kyle)

  • Once potentiometer arrives, calibrate the pressure sensors and prepare for integration to finger cots (Euan)

  • Finalize CAD design for enclosures of mounted components such as vibration motor, IMU, ESP-32 and begin fabrication (John)

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

• • Another doctor will come to the week 8 meeting, try to have a good working model by then for them to try out (5/8 in person)

  • Overall very happy with the progress since original scope was just finger pressure sensors (5/8 in person)

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

• • n/a

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

• • Integrating our web server with our data stream

  • Cleaning up our dual bluetooth serial code

  • Finding the appropriate resistance to get the right sensor resolution

  • CADing and printing the arm box

  • Cleaning up and filling in holes in our report

Resources or Information Required but not Available

• • N/A

Schedule

• • Preliminary design review (PDR) is going to be in two weeks and we are aiming to have a working integrated prototype by then.

  • Gantt chart has been updated for include some delays in ship

Budget (list amount spent and amount remaining)

A huge list of parts have been ordered

• • *3 IMU

https://www.amazon.com/gp/product/B01DIPN2R6/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

• • *5 Pressure sensors

  • https://www.ebay.com/itm/263209391769

  • *4 Velcro straps

    • https://www.amazon.com/VELCRO-Brand-ONE-WRAP-Cables-Wires/dp/B0057564NK/ref=sr_1_1?ie=UTF8&qid=1525748976&sr=8-1&keywords=velcro+straps+.5+inch

    • https://www.amazon.com/3M-Transpore-Clear-1-Inch-10-Yard/dp/B005OFM6JE/ref=nav_ya_signin?s=hpc&ie=UTF8&qid=1525793570&sr=1-6&keywords=medical%2Btape&th=1

  • *1 Lit. ion

  • 1 potentiometer

    • https://www.amazon.com/Uxcell-a12022200ux0326-Single-Linear-Potentiometers/dp/B0169OP1YK/ref=sr_1_3?ie=UTF8&qid=1525760374&sr=8-3&keywords=potentiometer+1m

  • 2 PCB boards

  • *1 roll of TPU

  • Connectors

  • *1 Haptic buzzer

  • *Small Heatshrink

  • Baby Fan

Progress on Report and Webpage

• Report will be updated to remove some filler pictures and content

• Webpage will be updated for better file management