AUTOMATIC AC ON/OFF SYSTEM IN CARS

Published Thursday 6 October 2011 by gk in  


AUTOMATIC AC ON/OFF SYSTEM IN CARS

Objective:
          Objective of this project is whenever the temperature exceeds particular limit automatically AC ON/OFF system in Cars.

Scope:
          Whenever temperature value exceeds from set value automatically AC ON/OFF. The temperature value we can set from Keypad. This project mainly used in cars, shopping malls, bus, home etc….


Brief Methodology:
This project is designed by following blocks,
Ø Microcontroller.
Ø Temperature sensor.
Ø Amplifier.
Ø LCD Display.
Ø Driver circuit.
Ø Relay
Ø AC.
Ø Keypad.
The car temperature is sensed by using thermistor. As the temperature increase the resister value is the thermistor decrease and vice versa. The sensed signal is given to bridge circuit. The variation in the resistance value causes the bridge to be in unable condition. The output signal from the bridge circuit is given to amplifier circuit for further amplification.
          The amplified signal is given to A/D converter. The signal is given to microcontroller, Microcontroller compares the temperature value in the algorithm specified and delivers the corresponding signal to relay in which speed it should move. The microcontroller may be ATMEL/PIC/RENESAS/ARM microcontroller. It will work according to our object already we have programmed.
 If suppose the temperature is below set value means then the relay should be in off condition.
We can set the temperature value from keypad and the LCD display is used to display the current temperature value and the set value. Whatever we want to display we can display in LCD. If suppose the temperature value exceeds from set value means the relay is activated through this relay the AC machine will be activated. Similarly the temperature value below from set value means the relay is deactivated through this relay the AC machine will be deactivated.

Applications:
·        Offices and general meeting places
·        Theatres
·        Industries
·        Car or any vehicles.

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