Two sensors are enough. Put them side by side along any track, i.e., any circle on the disk with the disk's center as its center. Say the sensors are A and B clockwise. After both sensors pickup the same color, if A detects the change of color before B does, then the disk rotates clockwise. Otherwise, the disk rotates counter-clockwise.
哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
雷达卡
发表于 2005-8-24 04:30:05
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楼主
发表于 2005-8-24 18:54:57