some help for speed controller

[Gut8]

hi

i have a variac controller connected to a fan that controls the fan speed, how hard would it be to connect some kind of thermostat to the variac that would increase or decrease the fan speed to keep a constant temperature?
i know i can use 2 fan controllers 1 set to high and one set to low through the thermostat so that the high or low comes on at a give temp, but thats too easy
and just having a thermostat that turns the variac on and off at the given temp isnt what im after either.
so wht do you think is this easy enough to do or will it get quite complex?
thanks

[knowledgegranted]

It would be very very easy, let me draw up a map for the configuration tonight. You'll have it by tomorrow.

[Gut8]

It would be very very easy, let me draw up a map for the configuration tonight. You'll have it by tomorrow.

:D thankyou knowledgegranted

[knowledgegranted]

Ok these are not my plans, but I know whos they are so they can be used!

http://i286.photobucket.com/albums/ll86/kamoki11a/fan-reg-sch.gif

Parts needed:

http://i286.photobucket.com/albums/ll86/kamoki11a/fannn005.jpg

If you need any direct names or any info please ask, from the plan you can pretty much figure out what you need.

[Gut8]

thankyou knowledgegranted ill have a look into this

[Oneslowz28]

I would be more than happy to design a board for this.