Design of an optical sensor

[Eng Noora]

Hi all, I need some ideas to use optical sensors of any type to find the speed and direction of motion of a motor. The shaft of the motor is fitted with a disk as shown below. Any sections may be filled with white and/or black colors to note the transition. (x) Waiting for your creative ideas;)

[Dan Neely]

smells like homework.

-- CleaKO The sad part about this instance is that none of the users ever said anything [about the problem]. Pete O`Hanlon Doesn't that just tell you everything you need to know about users?

[markkuk]

http://en.wikipedia.org/wiki/Rotary_encoder[^]

[Eng Noora]

Thanks for the site but the circle that I want to make the design for is divided into 4 sectors only.

[markkuk]

Just read the whole article, instead of only the first section.