No alchohol nor cotton sticks available at home to clean my skin for accurate EMG readings
The prosthetic hand user may use different batteries
No multimeter available to detect any potential short circuits
Not enough power from the Servo motors to curl the fingers enough to grab things
Little to no Serial data support on Raspberry Pi
Solutions
Used tape to remove oil, dust, and other dirty particles from my forearm before testing
Read the voltage outputs in intervals and curl the prosthetic fingers only if consecutive intervals produce consistent results
Always left a 220Ω resistor in the circuit before completing any circuits & used small LED lights to test if a circuit works as intended
Repositioned the servo motors, as shown in the Torque↑ Test above
Switched to Arduino Uno Rev3
Detection V1
Assuming there're no abnormal spikes in voltage outputs, it's fairly accurate. However, muscle sensors bought from Amazon sometimes give off abnormal spikes in the voltage outputs
Detection V2
Only tested this once, but solved the abnormal spikes problem by tracking the lowest voltage reading and analyzing the history of 20 voltage readings