ABSTRACT:

For this project, the user needs to interface the microcontroller with the DTMF receiver.the DTMF is one, which will recognize the ring signal and gives out binary equivalent of the incoming signal. According to the program written into the microcontroller, it fallows the data coming out from the DTMF and enable or disable the buffers.
When you forget to OPEN/CLOSE the doors, or to switch OFF our electrical home appliances, to switch ON alarm for industrial protection etc., To OPEN/CLOSE the doors and to ON/OFF all these equipment automatically we need the domestic automation.
Every one of knowingly/unknowingly forgets to OPEN/CLOSE the doors and to switch ON/OFF the electrical devices when we leave the hose or an office. So what a person does is:

One way to go back to his home and do the operation. If he has to travel a long distance it will be bit difficult to come back. The best way to operate the appliances with in seconds by a remote device such as telephone which is done by our project.
As now-a-day telecommunication network is expanding to every where, all are using telecommunication network as a medium to transfer data, voice etc. Here, for this project telephone is the medium to transfer the data from any where.
This is one of the best ways to control the appliances which is cost effective and can be afford by a common man.
The project “TELE CONTROLLED STEPPER MOTOR” using Atmel 89C51 Microcontroller is designed.

We have designed our project so as to rotate the stepper motor in forward direction and backward direction, by using this we can do OPEN/CLOSE the doors. And also we control our home appliances which are connected to relays.

AT89C51 had given an acknowledgment to the user if the desired work was done. Microcontroller produce single beep sound if the door is CLOSED or if the device was turned ON. And microcontroller produce more beep sounds if the door is OPENED or if the device was turned OFF.
Future Scope:
The project is further extended by using GSM modem instead of TELEPHONE, with the help of same DTMF and also may control more number.of devices.

For more details, u can view the doc below.