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Date: 10/20/03 at 5:01 AM
Posted by: Kui Sia
E-mail: ktsia@jeack.com.au

Hi I am trying to find a way to detect that no distance is travelled when the wheels are still rotating. For example, when a robot (on wheels) is stuck at some point, I need to be able to tell that this is happening so that the robot would know to turn around. This is a bit tricky since the wheels are still rotating and alone the left, right and front are ultrasonic sensors that tell where the obstacles are. However when an (say a box) obstacle larger than the size of the robot blocks right before the robot, hence pulses are no longer measurable (the distance is zero), then what kind of sensor should I use to detect there is no distance travelled although the robot seems to be moving. I thought of optical sensor (like optical mouse) may do the job. Any help is highly regarded.

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