how to design an 8051 based temperature controlled fans

i'm sory ajay because this my first time use forum hehe...
so i want to ask u question
1)after i sent data from ADC to 8051...how can use that data to controll the fan???
my assignment exactly same with cenadius...

you mean in the auto mode?
ok.. its like this way..
you can define boundaries..
if the temp is low.. ADC will give you a low value, and if temp is high ADC value increases..
so.. for low temp or say low ADC value Fan should be at low speed and for medium range of ADC value Fan should be at medium speed and for high temp val Fan should be at high speed..
or what you can do is.. directly suplly the ADC reading to the PWM and speed varies automatically with the temperature..