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Originally Posted by sparksandtabs
Why do you need the range finder?
If it is to find how far from the goal you are then there is an easier method. If you plan on using the CMU cam then have a constant in the program for the height of the light and then just derive the angle from the PWM signal of the servo. THen all you need is to do some trig  |
Actually I've been looking at using ultrasonics to detect other robots in autonomous mode and hopefully avoid them. With the field as open as it is and a bunch of robots moving to similar goals the last thing we want is a game of chicken between two blind robots.
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Originally Posted by Shu Song
The ultra sound provides for a more accurate range measurement with minimal error.
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Mmmmm more or less.... I don't know if you ever used them in Physics class or not but from playing with them they tend to by pretty finicky.
One, you have to assume their's nothing between you and the wall.
Two, you are facing the wall almost vertically, they don't like angles that much.
Three, that they have the range. The Parallax sensor I referenced had a range of 3.35 meters and that's pretty darn good for a ultrasonic sensor.
I admit I haven't actually used one in a robot application but we use them routinely in our physics class. They tend to be best at hitting a flattish surface at close range.