• Prof. Miloni Ganatra

: In this paper there is a home automation system using mobile and telephone connection. In this system first we have to dial programmed standard telephone system from any landline or any mobile phone that would ask for PIN no. or password for a secure transaction. After authentication the telephone would wait for a number to be entered from a user and according to the entered electrically, therefore it does not create any effect on telephone line. With PIN check system non authorized people number it would generate a dual tone multi frequency signal. According to this signal DTMF IC MT8870 decoder decodes the signal and converts it into a 4 bit number and transmit to a AT89S52 controller. AT89S52 controller would interpret the signal from the DTMF decoder and control the device using relays. Remote control system by telephone presented in this project is based on ATMEL controller and has very secure designed circuit is isolated both optically.

DTMF ,decoder, ATMEL, Optocoupler,Multisim

"Telephone Controlled Home Automation System Using DTMF", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.851-855, July-2018, Available :http://www.jetir.org/papers/JETIR1807137.pdf

"Telephone Controlled Home Automation System Using DTMF", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp851-855, July-2018, Available at : http://www.jetir.org/papers/JETIR1807137.pdf