O. Okokpujie  Kennedy, Odusami  Modupe, P. Okokpujie  Imhade, Olusola  Abayomi-Alli, 
    A Model for Automatic Control of Home Appliances using DTMF Technique,
    Research Journal of Applied Sciences,
    Volume 12,Issue 2,
    2017,
    Pages 266-272,
    ISSN 1815-932x,
    rjasci.2017.266.272,
    (https://makhillpublications.co/view-article.php?doi=rjasci.2017.266.272)
    Abstract: Electrical devices and appliances cause a lots of problem and havoc if they are not switched off when
they are not in use. This study developed a Dual Tone Multiple Frequency (DTMF) technology for the remote
control of home appliances. A Dual Tone Multiple Frequency (DTMF) decoder MT8870, a mobile phone, a
binary coded decimal decoder, a crystal pulse generator and other components were used for the model and
development of the system. The dual tone multiple frequency decoder (MT8870) receives and converts decimal
signals to binary. The binary signals are further processed and converted back to binary by the binary coded
decimal decoder. The processed signals are then sent to the relay for appropriate switching. Dedicated phone
digits send commands to devices/appliances by switching them on or off. The simulation was done using
MATLAB 7.0 using accuracy and convergence time as performance metrics. The simulation results showed
that the DTMF based home automation has high percentage of accuracy transmitting. The convergence time
result showed that signal transmitted took shorter time to converge. In conclusion, the developed model proves
to be efficient in controlling home devices/appliances remotely.
    Keywords: Automatic control;control of home appliances;Dual Tone Multiple Frequency (DTMF);home automation;remote control