Analog to Digital Conversion too Slow

[Dave McLaughlin]

We are trying to make a set of shaft encoders for our robot, but we are having some major problems. We are using the vex line tracker set's light sensors, and have made a plate with holes in it that gives us suffiecient change in value for each state. We made an interupt to check the sensors, but the conversion from analog to digital is so slow, we can't read fast enought to get accurate values at high speeds. We have heard about using digital sensors, but wanted more input before investing.

Thanks for the help...