Home Equipment Control Using Home Phone Signal

Zuriatiha , Kamaruzaman (2009) Home Equipment Control Using Home Phone Signal. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is to control ON and OFF home equipments using home phone signal. The telephone signal will convert the dual tone multi frequency (DTMF) signal to electrical signal. Two circuits are designed in this project. The first circuit used DTMF chip that converts tone signal from home phone line to electrical signal while the second circuit will concentrate on interfacing the low and high voltage using relays. All appliances must connected all the time to the power supply in order to function immediately and automatically when the project circuit operates and receive command to switch ON or OFF. Both of the circuits will have their own power supply to support the operation of this project. When the telephone handset is picked up and then the key pressed, DTMF signal from home phone will be transmitted to the DTMF IC, the digital output will be transferred to the demultilpexer. Then the 5-volt circuit will connected to relay circuit to convert low voltage to high voltage to the appliances. For those who live in double stony houses, it is very important because it can save time to on or off appliances. The home phone can be used to control the appliances by pressing any key needed.

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