Home appliances control using mobile phone

Now a days mobile phone has become a part of our daily life. Due to low cost of mobile phones, mobile phones are widely used for home automation. In this paper a remotely operated mobile phone controlled home appliances system is proposed. It is a DTMF (dual- tone multiple-frequency) based system consists of two mobile phones, DTMF decoder and ATmega8 microcontroller. One mobile phone is used as remote which may locate at far distance from home and another mobile phone is located at the home which acts as a receiver. The control information are sent via the remote mobile phone as DTMF tone, this DTMF tone is received by the mobile phone located at home, the received DTMF tone is then decoded by DTMF decoder MT8870 IC. The output logic signal of the decoder is used as input to the ATmea8 microcontroller. The ATmega8 microcontroller is previously programmed to control home appliances according to output of the DTMF decoder.