Fig. 5: Demonstration of ping-pong training program for simultaneous monitoring of multiple sensing signals. | Nature Communications

Fig. 5: Demonstration of ping-pong training program for simultaneous monitoring of multiple sensing signals.

From: Low cost exoskeleton manipulator using bidirectional triboelectric sensors enhanced multiple degree of freedom sensory system

Fig. 5: Demonstration of ping-pong training program for simultaneous monitoring of multiple sensing signals.

a Illustrations of four striking motions in ping-pong game, (i) forehand stroke, (ii) left sidespin, (iii) right sidespin, and (iv) smash. b The main activated sensors on exoskeleton for the corresponding strikes, the rotation direction of each sensor is marked by red arrow. c The real-time signals generated from four strikes, the channels of BF, BB, SF, SB, EF, EB, WF, WB, FF, and FB represent the forward (clockwise) and the backward (counterclockwise) rotations of the rotational triboelectric bidirectional back (RTBD-B) sensor, the rotational triboelectric bidirectional shoulder (RTBD-S) sensor, the rotational triboelectric bidirectional elbow (RTBD-E) sensor, the rotational triboelectric bidirectional wrist (RTBD-W) sensor, and the linear triboelectric bidirectional finger (LTBD-F) sensor.

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