Abstract
The present study developed autonomous-mobile floating-robot using one-board microcomputer Arduino which could measure automatically mean velocity in an open-channel flow. Camera tracking system and PID control method could make the robot remain the position against main stream, and then time-averaged streamwise velocity was evaluated reasonably by a duty-ratio of screw propeller motor. Reliable laboratory experiments with electromagnetic velocimetry provided the calibration curve that connects the duty-ratio and mean current velocity. Furthermore, the present floating could be found to move successfully in not only the laboratory flume but also in natural creek.
