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Weekly Meeting 15 (4/08/19)
Apr. 8, 2019—Letter of support and grade needed Will clarify info about the grade Reprinted housing for components Worked on validating servo actuation Lots of flutter Threshold too low Using 3 Hz low pass filter to smooth signal Removes noise Can try implementing function based on strength of contraction for threshold PID would help but geared towards...
Progress Report 8 (4/03/19)
Apr. 2, 2019—Previous Goals Last week, we wanted to continue working on the algorithm, implementing the buffer management system and beginning to implement the differential algorithm. We also sought to determine the relationship between pulse widths and servo angles and whether or not the servo returns to a “set point” when no pulses are sent. In terms...
Weekly meeting 14 (4/01/19)
Apr. 1, 2019—Classifier Leaning towards using linear piecewise function (other two options are polyfit and piecewise polyfit) Want to include calibration for MVC of each person The x-value will scale Can try plotting each person individually which will show the variability between people Servos Tried altering pulse-width with analog, but could only control frequency Found a library...
Weekly Meeting 13 (3/25/19)
Mar. 25, 2019—SNR Recalculated baseline without the co-contractions and this raised all of the values Initial contraction classifier Recorded raw EMG, Tested using: pure extensor test pure flexor test partial extensor/flexor Tustin approximation is working well Includes a discrete integral in the calculation allowing us to smooth as we go Helps with the flow and speed of...
Progress Report 7 (3/20/19)
Mar. 19, 2019—Previous Goals Last week, we sought to test and finalize the acquisition and preprocessing code, troubleshooting the infinite loop error. We also strived to implement and test the EMG differential and buffering code and finish SNR analysis (determine a primary subject and find the ideal electrode placement). In terms of hardware, we wanted to incorporate...
Weekly Meeting 12 (3/18/19)
Mar. 18, 2019—Emg Calculated SNR Should consider co-contractions as signal, not noise Should increase SNR values Servo motor Control angle We should think about how you can compare servo motor to prosthetic Prosthetic uses variable speed, servo does not Ottobock They will send us an address to send the arm this week Will get appraised for how...
Weekly Meeting 11 (3/11/19)
Mar. 11, 2019—Letter of Support We mentioned last semester We will check in with Dr. Walker EMG We have tested everyone and calculated SNR Currently Christian has best SNR Will retest Ally and Rebecca Matlab processing We will do correlations and matlab preprocessing to correlate MAV to hand angle Import equation into arduino code Two bipolar pairs...
Weekly Meeting 9 (2/11/19)
Feb. 11, 2019—Prosthetic hand update They say that we need an account number Emily will email her contact and cc Shaan If this doesn’t work, it might be best to show proof of contact with a servo motor Disclaimer: it may be more work Would have to recreate current control scheme Should start finding a motor Myoware...
Weekly Meeting 8 (2/04/19)
Feb. 4, 2019—Prototype 3D printed box to hold the battery and teensy board In future iterations: might add curvature Ottobock hand Servicing will take a while (2-week delay) Hand does not have a warranty Ottobock still appears to be misunderstanding what the project is for Worthwhile to send it to Ottobock Make sure they know it is educational...
Progress Report 4 (1/30/19)
Jan. 29, 2019—Previous Goals Our goals from our last progress report to this point included the following: We needed to finalize purchase orders for the hardware to be used in our project (such as the Myoware sensors, Arduino, and Teensy board). Additionally, we were to find contacts at Ottobock to determine how to proceed with repairing our...
Weekly Meeting 7 (1/28/19)
Jan. 28, 2019—Ottobock hand – moving forward: Shaan received a contact for “professional services” Kevin Kelly — Case contact Emily is going to email him and cc Shaan They have another hand, just would require an extra component (a post) Presentation Natural muscle control slide – shows 3 key features Sensory motor control might be better term...
Weekly Meeting 5 (1/14/19)
Jan. 14, 2019—Hardware Shaan called Ottobock Even on the highest settings, there isn’t enough gain for the arm to contract Everything else seems to be working Will call them back today Advice from Emily May not be enough current to drive it Might be a power issue Try hocking battery supply straight to electrodes Should check with...
Weekly Meeting 4 (12/04/18)
Dec. 4, 2018—Completed: Disassembled prosthesis- we were unable to get the hand to move at all. We hear a faint beep coming from the motor but no actuation. Shaan will be troubleshooting this to determine if the motor is the problem over winter break, so any suggestions you have would be greatly appreciated! Meeting with Vanderbilt mechatronics/control...
Weekly Meeting 3 (11/13/18)
Nov. 13, 2018—Progress Update Helpful to send materials by 9am at the latest on Tuesdays Lit review/patent search Oral Report Contains all important progress so far Components: Slide 5: overview so far–includes problem statement Slides 6-9: needs assessment Slide 10: Project approach Slides 11-12: timeline and lit review Slide 13: hardware block diagram Update slide: change colors...
Weekly Meeting 2 (11/07/18)
Nov. 7, 2018—Updates Shipping arm tomorrow Literature Review In progress Begin a patent search Goal: to be done by the end of next week Send to Emily Questions Are the myoelectric controllers (myowaer muscle sensor) integrated into the prosthesis, or do we have to buy those along with the electrodes? Not necessarily the same for every device...
Weekly Meeting 1 (11/01/18)
Nov. 1, 2018—Documentation Look into the verification and DHF and DSF files and what are the requirements from the Vanderbilt University requirements Overview of project: Two types of prostheses: body powered (functional and durable but don’t look like a hand and hard to perform complex motions) and myoelectric Myoelectrics: single range of motion, mechanics of the hand...