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Temperature controlled Fan
BLOCK DIAGRAM Abstract: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. 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.
Block explanation 1.
Sensor: - The use of the sensor is to sense the temperature at its surrounding and give the signal to the controller. We will use ds1820 as a temperature sensor IC because it converts temp into voltage of high magnitude and also give direct value to seven segment to display the temp in 0C.
2.
Zero crossing detector: - The use of ZCD is to reset the displayed temperature on the seven segment display and to reset the speed of the fan.
3.
Microcontroller :- The microcontroller is the heart of this project , which will take the signal from the sensor and then drive the fan and the seven segment display according to temperature .
4.
Drivers:- these are connected to drive the seven segment display.
5.
Seven segment display:- To display the temperature sensed by the sensor.
6.
Opto coupler:- It is used to isolate the fan from the microcontroller.
7.
Triac:- It is used to give desired power to the fan to control fans speed .
8.
Motor:-It is used instead of the fan to demonstrate that the change in the speed according to the temperature .
Working:-
The
project has two modes of operation The change in the mode is done by aswitch Mode1:-
auto mode
The temperature sensor will sense the temperature and send the signal to the microcontroller. Then the microcontroller sends a signal to opto coupler as well as to the 7- segment display. Then the opto coupler will give single to the triac, so that the triac starts conducting i.e. more or less according to the input (gate) signal. Which in turn drive the motor (fan) to the respective speed according to the temperature. The ZCD circuit is used to refresh the value of the seven segment display
Mode2:-
here
manual mode
all the above procedure will work but here the switch connected to the controller come into picture by using these switches we can alter the program and increase or decrease the speed of the fan for the same value of the temperature by using the switch
