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Originally Posted by velocipenguin
The problem with this method is that the sensors are very sensitive to reflections. The servo approach uses heatshrink tubing over each of the sensors to limit how much area each of them can see. You can't do this with a pair of fixed sensors, because they'd only detect a signal at a certain distance from the beacon (where both sensors point directly at it). You could, of course, do without the tubing, but this would cause the sensors to trigger when they're pointed anywhere within 180 degrees or so of the sensors.
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We just finished testing this with our EduBot (after some difficulties with soldering of the beacons and other hardware problems), but this method seems to work very reliably, independent of distance to the beacon. We only used two sensors, one pointing right the other forward, housed in some cardboard with a narrow slit (the one pointing forward had two "houses" with two slits to limit input for greater accuracy).