About telephone interface to microcontroller 8051

[mikemikemike]

Any chip can be suggestted and also any successful example, sch ,etc?
Or any reference ventor ?
THX very much

 

[mogur]

Pretty nebulous question, depends on what type of interface you are interested in. Spi, i2c, pulse or dtmf tone dialing, terminal emulation, home automation interface, modem, caller id, etc., etc.

Here's a pdf of an 8051 based terminal emulator by infineon (Siemens)

 

[mikemikemike]

About telephone control project, i want to dial to a simple domestic telephone in order to control device on/off by 8052.

i check that there are some chip set about dtmf. But don't know how to use.
And also, any reference?

 

[mogur]

Ah, hah! The standard dtmf receiver interface chip is the MT8870. Google that for all the info you need. I found that the MT8888C by Zarlink incorporates a dtmf transmitter and an intel micro interface (including the 8051/2) onboard the IC. Under $3, too.

Here's a link for the Zarlink MT8888C data sheet-
**broken link removed**

And the application note for interfacing to common micros-
**broken link removed**

 

[mogur]

Just spotted a post by Tomi Engdahl with some links to circuits that interface the 8051 to the telephone for home control.

https://www.epanorama.net/wwwboard/messages/9128.html

You might be very interested in the section "Remote controlling using telephone" in this link.

If those more experienced than me with this type of circuit don't jump into this thread, you probably will find all the help you need in any of the 8051 micro forums.

 

[mikemikemike]

Thx , very much

 

[rameshyadavalli]

is there any project or circuit which pic dails a number directly which is connected to telephone directly .....

 

[akg]

is there any project or circuit which pic dails a number directly which is connected to telephone directly .....

u could do it with a dtmf generator like HT9200(tone dialing) or make n break relay (pulse dialing) controlled by a pic

 

[sumeshm.pnr]

i want a circuit idea about how i can interface telephone line to 89c51....
i actually requires a caller id. and which in turn connected to lcd display and to pc to monitor the calls..... the circuit also have an autoteller facility..

 

[sumeshm.pnr]

pls reply me ... its urgent...............

 

[blueroomelectronics]

pls reply me ... its urgent...............

Here's a urgent reply. Exactly as requested.

 

[sumeshm.pnr]

Here's a urgent reply. Exactly as requested.

thanks for reply............
but i couldn't locate my needs from that site.........

 

[shahtejasm]

DTMF Decoder

Here's a urgent reply. Exactly as requested.

hi,

i connected 8051 with mt8870.
if i dialled no then am i abel to detect indication about dialled no line whether the person hook up the phone, or phone busy etc.

plz reply.