The hardware design is more or less based at the uArm schematics. It has five levels of motion. The servo vehicles used are 3- Mg995 (metal equipment) at the side of 2- Sg90 (silicon gear). every servo motors takes upto 1.5A of contemporary so offer the strength deliver should be adequate.
Arduino Uno is used because the controller together with Raspberry Pi. The feature of Arduino is to continuously concentrate for a Serial command from the raspberry pi.