Thanks for these anwsers gentlemen,

Michael, the encoder you've mentionned is more interresting than the one I was looking at. I'm going to check the availability in Farnell (This is the only supplier I've found in France to sell 1 low-cost encoder).

Tell me Michael, which code do you add to put an HTML link in your post ?

Fedia, I will check your suggestion.

Thanks
Stephane
http://perso.wanadoo.fr/rs-rey/el...essources/