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Originally Posted by GlennGraham
With the ultrasonic sensor, I find that it works pretty well if it faces a smooth, flat, solid surface but gets pretty "iffy" with anything else (hand, leg, cat, etc.). Is this typical?
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Our experience with the ultrasonic was similar when we tried to "see" a scale vision tetra. We were scanning with a pan servo and with the small target the sensor was iffy over 26". The sensor was mounted at a angle to best pick up the return from the tetra, but it was still iffy. A cereal box gave a solid return out past 60". The specs say the sensor range is ten feet, so I was happy with these results. The sensor works very well for following a wall, but we need to do more work with spotting objects which aren't very large.
We're just starting to work more seriously with the encoders, so I'll wait a while to comment on those.