Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Sensor fabrication complete
Apply sensor layout
Complete data acquisition circuit, place components on breadboard and test this week
Complete printed circuit board design this week
Still need to lock in the calculations needed to locate the strike and measure the force from the sensor data
Verified compatibility between MATLAB, Teensy microcontroller, Arduino Mega, and NRF24L01 wireless transceivers
Accomplishments from Previous Week
Finalized sensor layout (Reuben)
Finalized CAD golf face (Reuben)
Soldered 32 wire leads to copper tape (Kaitlynn)
Applied polyimide tape as sensor protection and as insulative layer between conductive adhesive copper tape (Kaitlynn)
Reinforced sensor connection point with insulative epoxy x32 (Kaitlynn)
Tested individual sensors to ensure similar output to similar impact (Kaitlynn)
Updated signal conditioning circuitry to use less components utilizing differential op-amp circuit based on Dr. T's suggestion (Chris)
Showed that differential multiplexing is possible to use less overall components (Chris)
Tested sensor and data acquisition in actual golf club impact, and was able to recognize impact (Chris/Reuben)
Analyzed the sensor data from multiple experiments to see if there was a consistent pattern (Michelle)
Successfully connected Matlab to the Arduino Mega and NRF24L01 transceiver-- Matlab able to read Arduino serial monitor (Michelle)
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Research/select potting compound (Reuben)
CAD for electronic placement in golf head (Reuben)
Test individual sensors to ensure similarity before applying layout (Kaitlynn)
Trim force sensor to fit on acrylic face and test stand (Kaitlynn)
Apply final sensor layout to acrylic face (Kaitlynn)
Build complete data acquisition circuit on breadboard (16 sensors), and test (Chris)
Complete printed circuit board design and send out for production (Chris)
Develop trigger point for accelerometer, using actual golf club and swing (Chris)
Refine Matlab code that will grab data from the Arduino and calculate the needed characteristics of the strike (Michelle)
Work on finding a consistent pattern that can use the sensor data to calculate the needed characteristics of the strike (Michelle)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Recommended staying local for ordering the printed circuit board (4/22 via Zoom)
Incorporate the design of additional memory. This will make things easier down the road since we don't know how TaylorMade intends to use it (4/22 via Zoom)
Do tests to form a baseline for each sensor then go based on the magnitude you expect from each sensor (4/22 via Zoom)
Voltage range we're seeing comes down to fabrication. It's difficult to get the same level of contact with each sensor. The voltage output might be more constant when we hook it up to the DAQ. The oscilloscope is not a good indicator of voltage output in the field. (4/22 via Zoom)
Lithium ion battery is good for now. It can be swapped out later. (4/22 via Zoom)
Send proof of concept presentation once complete (4/22 via Zoom)
We can look into setting up a meeting with TaylorMade to inform them of our progress and keep them involved. (4/22 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)
Suggested using an op-amp to control the gain; have tested and decided to incorporate an op-amp and programmable gain amplifier to our data acquisition design (4/20 via Zoom)
Working with extremely small components. Look into getting a magnifying glass for soldering; magnifying glass has been purchased (4/20 via Zoom)
Talk to Steve to see if the soldering iron we have is good enough; good iron, might need different tips (4/20 via Zoom)
Do we have enough memory to store the data? Unless we can get the accelerometer trigger down to right before impact, we will need external memory. (4/20 via Zoom)
Work in parallel on the accelerometer trigger. Reuben has clubs he can test on. (4/20 via Zoom)
Any estimate on printed circuit board yet? We haven't gotten any quotes yet. It still needs to be designed. Steve informed us that lead times are still very short for PCB design, even from Chinese manufacturers (8-10 days shipped from China) (4/20 via Zoom)
How are we putting this on a golf club? We are using a CAD model of a golf head consisting of two pieces: the face and the body. We want to prove that this could fit in a golf head and withstand forces. (4/20 via Zoom)
Do we have requirements on mass and inertia from TaylorMade? No. They didn't specify maximum weight. They mentioned they add weight purposefully to most of their clubs, but weight from the electronics could be used instead. They're more focused on the sensors and if we can extrapolate the characteristics from the data. (4/20 via Zoom)
What battery are we looking into? We ordered a 1200 mAh lithium polymer battery. Keep the battery away from shock load. We definitely want it to be external from the club head. (4/20 via Zoom)
Put a limit on what we're designing. Does it need to be good for 50 swings, 100 swings, a round of golf, a training session, etc? (4/20 via Zoom)
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
Sensor data
Resources or Information Required but not Available
N/A
Schedule
Adhere final sensor layout
Complete data acquisition circuit
Budget (list amount spent and amount remaining)
Amount Spent: $1,577.89
Amount Remaining: $1,322.11
Progress on Report and Webpage
First draft of report due midnight Friday
First draft of webpage due midnight Friday