Here is a robotics kit that comes with everything you need to build your own Arduino-powered robotic exoskeleton. The EduExo Pro comes with an Arduino microcontroller, servo motor with up to 6Nm of force, an EMG sensor, a potentiometer, and everything you need to put it together.
The EduExo Pro comes with a handbook that teaches you how to assemble the mechanical parts, connect the electronics, and program the microcontroller. It has a powered elbow joint and a 2DOF shoulder joint. You can use this exoskeleton to interface with VR environments.