156B Week 4
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Bluetooth connection has been established and remained stable.
Quaternion code has been set up and debugged.
Potential feedback options for when user reaches the maximum threshold have been evaluated
Load cell code is still being figured out and the testing rig just needs 3D printing a base and top
Accomplishments from Previous Week
Communication with the raspberry pi has been completed. We are able to send out messages from a computer to the raspberry pi and via versa
Nitrile Finger cots were purchased and tested. These finger cots were received very positively by our sponsor but will have to determine the integration of sensors.
PCB board design is nearing completion and will purchase a few boards soon.
A vibration motor was purchased but turns out to be quite weak. We will purchase one with a much stronger vibration. LED RGB lights have also been purchased as status lights for the prototype.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Turn in those purchase receipts (Kyle)
Order PCB board once completed (Kyle)
Rework Load cell code to be a friendly interface as a calibration rig (Euan)
Update Website (Euan)
Evaluate Nitrile Finger Cot vs the fabrics previously ordered (John)
Optimize Quaternion code for IMU’s (Michael)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Dr. Chang is in favor for the Nitrile Finger Cot and thinks theyre a better alternative than the fabrics because it's disposable and stretchable. We will evaluate on the feasibility of integrating sensors to it.
He also agrees that the PCB design would make the whole project more robust.
Special Guest Karcher Morris, grad student, joined us last meeting and offered to help with any raspberry pi code questions.
Dr. Chang suggests moving the electronics module closer to the wrist instead of having it near the elbow (he's mainly concerned with "up and down" or flexion/extension and not necessarily all 3 degrees of freedom)
Dr. Chang would also prefer both a backup of installs and a good way of saving the data on some kind of hardware (like with a USB stick)
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Look into haptic feedback for alerting the user to injurious use (4/19)
A small buzzer was purchased, though it may be too small for our uses so we're looking into bigger, more powerful ones.
Consider contacting Druann Greer-Cisneros regarding design sketches and consulting for glove ideas considering she will do it free of charge, and if she is able to, she may be able to sew the gloves professionally for a fee (4/19)
Druann has been emailed and some good ideas have been passed back and forth.
Try to include some alternate method of installation rather than relying on the raspberry pi as an intermediary for better confidence (4/19)
This is currently being looked into for the future.
Do consider the pros and cons of using nitrile finger cots versus making your own (4/19)
While sewing the cots would indeed create a more stable bed for the sensors, it has been determined that the disposable nitrile cots will fit Dr. Chang's requirements, and that he is willing to sacrifice some accuracy/precision, but hopes that the sacrifice is minimal.
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
Nitrile finger cots vs Fabrics
Resources or Information Required but not Available
N/A
Schedule
Proof of concept presentation is coming up next week.
Sensor choice, glove choice deadline is also coming next week
Budget (list amount spent and amount remaining)
Spent: $322.52
Remaining: $677.48
Recent Purchases:
Tactilus Free Form - $10.99
Vibration motor - $6.00
ESP 32 - $10.99
LED RGB - $5.69
Nitrile Finger Cots - $8.03
Scale - $8.13
Progress on Report and Webpage
Website will be updated this weekend