appliances used in our home are controlled with the help of switches.
These days, you can see many technologies used in home automation projects. his article presents the controlling of home appliances using DTMF technology
The main principle of this circuit is to
control appliances like light and fan using DTMF technology. DTMF
encoder is present in your mobile and decoder is HT9107B IC. Mobile jack
is connected at 1nf capacitor. Mobile jack consists of two wires (Red
and black). Red wire is connected to the decoder IC and Black is
grounded. When a button is pressed from mobile it generates a tone which
is decoded by the decoder IC and it is sent to ATMEGA8 controller.
Controller then checks for input and it produces the output according to
the code written to it.