Thanks Bruce
For your time and explanations i have ordered the ds1804 and should get it in the morning and i have also looked at the datasheet .
The only thing thats still worrying me is i can't seem to find on the data sheet how to preset a specific value without saving the wiper position.
for my application, i want to be able to set the pot to 2k ohm
then 4k , 6k , 8k then 10k
so that when i run my program i would have 5 different subs for 2k, 4k etc
would this be posisble

Toni