so thanks for everybody who repply to me and help me! so we won the science fair and now we are going to do it again  against other high school! and we have a problem with the ir led aray bc we couldnt find that anywhere so someone help to do it and it works but it only have 12  ir leds and when we used we need to put the reflective very very closed to see it in the computer even sometimes u put the reflective tape u cant see it! its very hard to show on in the computer!
so can someone help us! we dont know whats the problem! if someone can someone contac me!