The System is fully controlled by the microcontroller AT89S52. It is a popular 8 bit microcontroller. The circuit consists of four switches, in which two buttons are used to increment and decrement the temperature value and the next button is to edit the temperature values stored it in the memory and the other button is cancel button.
All the above functions are monitored and controlled by the 8 bit microcontroller AT89S52.
This Project is used to control the Fan speed according to the temperature and it also indicates the temperature. The system will get the temperature from the IC (DS1820) and it will control the speed according the values stored by the user.