Telephone Operated Remote Control

Fazliana , Hassan (2011) Telephone Operated Remote Control. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Here is a circuit which enables switching teleremote “ON” and “OFF” from the lights of home appliances through the phone line. It can be used to switch devices remotely without the address range. Dial a phone number that connects to the system and the transformer will convert the 240V to 12V. It's fitting that this system is only using 5V and 12V. After dialing, the system will be connected to the ring detector and connected to a Dual Tone Multiple Frequency that will convert the signals into Binary Code Decoder converter. DTMF signals on telephone instrument are used as a control signal IC CM8880 (DTMF to BCD converter) is received. This output will be connected to the PIC 16F873 (converting 4 to 16 line demultiplexer), and dialing or pressing any key will not activate any system until you enter a code to activate the starter entering the keyword password set by the user. Then, when we started pressing a DTMF tone to produce high frequency 1209Hz and 697Hz low frequency output converted to BCD '0001 'demultiplexed into digit “1”, output and activating the relay switching on the equipment and the process will continues as we desire. To start this system, pressing the *(password number) #. And to begin the process of ON or OFF can be done after a successful password is detected by the system. This system aims to facilitate the user when no user at home and diversify the home phone line. If there are people who make calls to home phone number is connected to telephone operated remote control, the device will establish a call, no tone will be heard of what will happen unless someone pressing the *(password number)# button that will launch the system.

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