need help on home security
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Posts: 1
Joined: Oct 2010
09-11-2010, 10:34 PM

well i build an home security for my finel project and implimentation on elec.

i build it that whan ther is alart on some place it calling to some number that kept in the memory, and tell him what happen on the house.

i got problems on connectin the calling system, this is my problems

1) what is the recommended DTMF dialer for this project and implimentation and most easy to use?
2) how i connect the DTMF dialer to the RJ9? ( we got only 2 cabels in our contry not 4, so only mic and sound i guess )

3) are all the contres got telephone standard or all contry got her own standard?

and what pass on the phone line? are this some kind of modulation?

4) how can i know when some one answer the phone?

5) how i connect the voice chipe to the RJ9 ? how voice move on the phone line?

tnx for all answers, sorry if i got bad eng ( not my lang Sad )
computer science crazy
Super Moderator

Posts: 3,048
Joined: Dec 2008
15-11-2010, 05:17 PM

i suggest you to read and implimentation/docs/Hardware%20Description.pdf

may be Dtmf Decoder 1610 Am a simple one to use as
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion

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