6 Motors + Bluetooth Module/External Power
This is meant to control the prosthetic hand. 6 Servo Motors (MG996R): 4 Motors for each finger and 2 Motors to control the thumb's movement and rotation.
Connect 6 Servo Motors and use Arduino Mega 2560 R3 to use digital pins 7-12. Connect Bluetooth Module, in this case (HC-06) based on their corresponding input (VCC, GND, RX, TX). Note that GND goes into the Arduino Board. Then connect external power (Using 7 Volts Power Supply) for this project. Power goes to the breadboard and Ground goes to the Arduino.