Temperature Controlled Fan Using Micro controller 8051/8052 ( C Program)

I have recently made a temperature controlled DC fan whose speed increases with the rise in temperature and decrease as the temperature falls !  It has got a lot of practical usage as it  does not require to manually operated and it turns off as the temperature falls below a certain threshold ! and the temperatures on which you want to change the speed or turn off the fan are completely user defined !!
The components required are:
1.AT89S51/AT89S52
2.ADC0804
3.LM35
4.L293D

LM 35:

            Temperature sensor whose output voltage varies with the change in the temperature. The output voltage increases by 10mV  for 1 degree rise in temperature.

ADC 0804:

              It is an analogue to digital converter who converts the provided analogue signal into corresponding digital signal. It uses the provided reference voltage to provide digital output from analogue input.