An exoskeleton is a supporting structure on the outside of a body. The name stems from the words exterior and skeleton. In the context of this project, it is an exterior support structure of the human arm amplifying the force delivered by the biceps brachii. The actuator of the exoskeleton taking the place of the biceps is a DC motor acting on the elbow joint of the exoskeleton. The design of this exoskeleton takes its controlling signal from electrical signals in the biceps muscle. This electrical signal, called the Electromyogram (EMG), is a measure of the electrical activity in the biceps. The amplitude of this EMG signal is directly related to the amount of force delivered by the biceps. From this amplitude we can make a close determination of the force delivered by the biceps and translate this force into the torque which can then be sent to the exoskeleton actuator – the DC motor. In this manner, the exoskeleton will assist in bearing a load on the human arm.

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