The reason for the two sensors per tracker is so that one sensor can see to the left and one to the right, so you always know which way to move the tracker. You could change the design to one sensor per tracker, so long as you restrict it's "sight" to a few degrees ... though the code will not work as well, and you'll have to change some logic. Or you could just put the sensors stationary and use an alternative method.
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i dont know where should i earase and where not??
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I assume you're not an expert C programmer, well-versed in the code at kevin.org. So editing it a great deal might not be a good idea. In that case, you might want to stick with the setup he has. I don't really understand why you only have one sensor per tracker; is it that you only have two sensors, or that you only use two sensors (you should have received more in the kit and can purchase others if need be).