Dear All,

Thank you for all your help with this. I do have faith!

Anyway, to sum up. I haven't been able to find optical encoders in the UK
for less than 35 pounds. However, I am now using a Bourns mechanical
quadrature encoder from Farnell which is relatively cheap at 3 pounds.
Cirkit doesn't stock Bourns anymore.

Thanks to some edge detection code, I am now Sorted!

Anson Chuang