CELL
PHONE BASED DTMF CONTROLLED GARAGE DOOR OPENING SYSTEM
ABSTRACT
The main
objective of this project is to unlock a garage door by a mobile phone using a unique
password entered through the keypad of the phone. Opening and closing of garage
doors involves human labor. In this proposed system, the opening and closing of
a garage door is achieved by using a mobile phone. The owner can call to a
mobile phone interfaced to the system which in turn is connected to the garage
door that can open/close the door by entering the password. This method is very
convenient as one doesn’t have to get down of his car to open/close the door
physically.
This project is
based on the concept of DTMF (dual tone multi - frequency). Every numeric button
on the keypad of a mobile phone generates a unique frequency when pressed. These
frequencies are decoded by the DTMF decoder IC at the receiving end which is
fed to the microcontroller. If this decoded values (password entered by the
user) matches with the password stored in the microcontroller, then the
microcontroller initiates a mechanism to open the door through a motor driver interface.
Further this
project can be incorporated with an EEPROM i.e., a non-volatile memory so that
the password can be changed by the owner.
BLOCK
DIAGRAM
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