156B Week 7

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

• • Using the Forms 2 SLA 3D printer with Tough 1500 Resin to print the golf body, handle, and receiver enclosure

  • PCB lead time: ETA 5/15

  • Ordering components to assemble circuit on PCB

  • Sensor layout arranged and ready for adhesion to acrylic plate

  • Will begin sensor calibration once the impulse hammer arrives

Accomplishments from Previous Week

• • Established the 3D printing process for all the parts (decided which material, where to print and post-process, etc.) (Reuben/Michelle)

  • Finished general design of the receiver enclosure (Michelle)

  • Finalized Driver Head design (Reuben)

  • Purchased/received Driver Shaft (Reuben)

  • Received final driver head hardware (Reuben)

  • Finalized Grip design (Reuben)

  • Finalized component list for v1 PCB design, includes instrumentation amplifiers instead of op-amps and resistor networks, 16 to 1 multiplexer, buffer amplifier, and programmable gain amplifier (Chris)

  • Finalized v1 PCB design: design includes 2 different PCBs that work in tandem to better utilize space (Chris)

  • Ordered 2 copies per PCB from Sunstone Circuits (Chris)

  • Fabricated replacement sensors (Kaitlynn)

  • Tested sensors on op-amp circuitry (Kaitlynn)

  • Arranged location sensing layout (Kaitlynn)

  • Trimmed force sensor to fit on acrylic plate (Kaitlynn)

  • Finalized sensor adhesion method (Kaitlynn)

  • Prepped sensors for epoxy adhesion to acrylic plate (Kaitlynn)

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

• • Find a solution for MATLAB code to read the entire serial monitor of Arduino not just one line (Michelle)

  • Incorporate LCD into the Arduino Mega (Michelle)

  • Print the receiver enclosure and finish assembly (Michelle)

  • Start designing testing protocol for PCB (Chris/Michelle)

  • Use PCB design to finalize driver potting mold (Reuben)

  • Purchase shaft components (Reuben)

  • Update CAD models for report (Reuben)

  • Develop code to write and read to external flash memory (Chris)

  • Combine all individual component codes into complete working code (includes memory, accelerometer, multiplexer, programmable gain amp, RF transciever, and Teensy 4.0 analog to digital converter) (Chris)

  • Adhere sensor layout to acrylic plate with epoxy (Kaitlynn)

  • Begin sensor calibration with impulse hammer once received (Kaitlynn)

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

• • Epoxy might be getting in between the silver paint and PVDF. Try taping over the silver paint before applying epoxy. (5/6 via Zoom)

  • It could just be bad luck with some sensors not working. The fabrication process is very delicate, and it's impossible to get all of them the same. (5/6 via Zoom)

  • Start with the range of forces you want to measure, then see what voltage range that maps into. 5 kN range with 10-bit gives 1.2 N/bin. Is that good enough? We will test with the PCB once it's in. (5/6 via Zoom)

  • Dr. Loh is speaking with TaylorMade on 5/7 to update them on the progress (5/6 via Zoom)

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

• • Leakage between channels could be from high impedance sensors and no op-amp between the sensor and multiplexer. We would need a minimum buffer most likely. Look at the slew rate when selecting op-amps, and make sure it's fairly high. (5/4 via Zoom)

  • Are we still planning to calibrate? Yes, with the impulse hammer. It is supposed to arrive on 5/11. (5/4 via Zoom)

  • What is the bilayer potting method for? The hard component prevents deflection of the PCB, and the soft component absorbs the shock. We will reference the paper that did research on the bilayer method in the report. (5/4 via Zoom)

  • Report comments (5/4 via Zoom and 5/7 via email)

    • Check name spelling!

    • Don't use first person

    • Quantify functional requirements

    • Specify deliverables

    • Tables shouldn't overlap pages

    • Are there any standards that influenced the design?

    • Use metric units with english in parantheses

    • Try to keep Executive Summary to two pages

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

• • N/A

Resources or Information Required but not Available

• • N/A

Schedule

• • 3D print final components

  • Sensor adhesion and calibration

Budget (list amount spent and amount remaining)

• • Amount Spent: $1,759.51

  • Amount Remaining: $1,140.49

Progress on Report and Webpage

• • Webpage and report 1st draft complete

  • Updated webpage and report addressing comments from Dr. T and Darren due midnight Friday

  • Continue to update webpage and report with new results, CAD figures, and pictures throughout the week

  • Finish the component sections of the report