February, 2019
Actuation: Ottobock Communications and Proof of Concept
Feb. 26, 2019—When we started our project, we were given a donated Ottobock prosthetic arm. It was unclear whether or not the prosthesis would work, and after many troubleshooting attempts, we found that the arm was not functional. Upon mechanical isolation between the motor and gears, it was found that no jamming was occurring. We also increased...
Progress Report 6 (2/27/19)
Feb. 26, 2019—Previous Goals We had previously strived to continue hardware addition and construction with battery pack incorporation and the identification of myoware sensor processing issues. We also aimed for translation and effective implementation of PID controller in arduino IDE. EMG testing was begun and we hoped to continue the identification of effective phantom users and become...
Weekly Meeting 10 (2/18/19)
Feb. 19, 2019—Prosthetic Hand Update Kevin (contact from Emily) connected with third party in the US who should be able to identify correct path moving forward For time’s sake: SERVO Motor to be ordered this week Need to match properties of the hand PWM actuation Hold angle once the signal ceases as current velocity-based systems do Algorithm...
Serial Output for Myoware Sensors
Feb. 13, 2019—First Visualization of Myoware Sensors The relative ports for each of the myoware input/outputs for serial observation of the output forms. This is without internal feedback, that is each sensor is outputting to independent analog ports to be read. Theoretically, both sensor positive nodes could be soldered to the same 3.3 V node in the...
Progress Report 5 (2/13/19)
Feb. 12, 2019—Previous Goals Our prior goals included writing a protocol for EMG studies with myoware sensors (such as how to test and where to place electrodes). We also strived to investigate EMG signal interpretation and analysis, reading existing literature to map expectations of movement. We further investigated PID behavior with manipulated variables creating sine and step...
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...
PID Observations
Feb. 10, 2019—PID Observations General behavior Characteristics: Higher Proportional Control = Operates at defined setpoint Higher fraction control here to force the fight between muscle activation and relaxed hand posture Lower Proportional Control = Infinite rise in output value (operating in the single digits results in 10^6 outputs) Higher Integral Control = Infinite rise in value although...
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...