This document describes a temperature control system using a microcontroller that can operate automatically or manually using an external interrupt. The system uses PWM to vary the motor duty cycle based on temperature readings from an ADC. Simulations show how duty cycle and motor speed increase with higher temperatures. The system has applications for controlling power consumption in air conditioners and cooling computer processors or facilities. The problem statement and simulations are complete but the hardware implementation is only partially finished.

1. Peeyush Pashine(2011H140033H)
Sri Krishna Yadav(2011H140031H)
Pravesh Tamrakar(2011H140036H)
J. Ganesh(2011H140032H)

2. Code
 Enabling and disabling the entire operation
through INT1 external interrupt
 Automatic and manual operation
 For controlling the motor PWM concept is
used i.e. varying duty cycle generation
according to temperature.

3. Simulation
 lets take the output of ADC as 02H=00000010B
 From ttable value of temperature is 26 degree
centigrade, corresponding hex code for 7 segments
are,6D,5F,respectively.Offdelay=16*5+6=86,ondela
y=100-86=14.. Duty cycle= 14%
Now if temperature value is 48 centigrade,
offdelay=10*5+2=52, on delay=100-52=48, duty
cycle increased to 48%. Hence motor speed will
increase.

4. Simulation contd…

5. Simulation (Multisim) contd…

6. Hardware Implementation

7. Application
 In appliances power consumption can be
controlled. Eg. Air conditioners
 In computers, it can be use to cool the
processor
 In institutes, Firms industries etc..

8. Conclusion
 The problem statement is implemented
 Hardware part is halfway implemented.
 Through simulations and after running the
code in IDE abstract is verified.

9. Queries?

10. Thank you !!!