Control Over Phone Line

[jeanfernandes]

schematics mt8889 interface to téléphone line


Sirs
Its a phone interface to use with any microcontroller/microprocessor.

Features

- Detect Ring
- Hook on/off control
- Read DTMF signal
- (use to control any application)

Have Fun

Jean Fernandes
coneel@engineer.com
Coneel
Smart Solutions

 

[bogdanm]

rat_ring

For a lot of very interesting and useful docs and schematics concerning the same thing (phone line interfacing and applications) join the rat_ring group on yahoogroups.com and go to the "Files" section.

 

[sokrat]

For a lot of very interesting and useful docs and schematics concerning the same thing (phone line interfacing and applications) join the rat_ring group on yahoogroups.com and go to the "Files" section.

Hi dear bogdanm

How i can be member of this group " rat_ring group "


thanks

S 8O KRAT

 

[jeanfernandes]

SignIn on YahooGroups

Dear Sirs

Lets go to www.yahoogroups.com and sign in on rat_ring group. I am on pending member with nick coneelbrazil.

Thanks

Jean Fernandes
Electronic Engineer
Coneel
Smart Solutions
coneel@engineer.com
coneelbrazil@yahoo.com

 

[bogdanm]

Check out this link:

hxxp://www.geocities.com/constantinescuradu/content/dtmf.htm

It describes how you can implement a DTMF decoder with a PIC16F87X, easily adaptable to other microcontrollers. Good article, not incredibly clear though

 

[sokrat]

dear bogdanm


very good project and group but ican use 8051 for this project :?:


thanks

S 8O KRAT

 

[bogdanm]

I'm sorry, I don't have a sure answer for that. Must probably you can use it with a 8051, but it has to have at least the speed of the PIC, so look for an enhanced core, one that can execute a machine cycle in four clock cycles or even in one clock cycle (Dallas Semiconductors makes something like this). Besides speed I don't see any other problem porting the algorithm from PIC to 8051.

 

[jeanfernandes]

The Next Step

I itend to improve the initial circuit replacing the MT8870 to MT8889 to dialer.

Other improves will related to :

- Interface to PIR sensors
- Interface to Wireless PIR
- Interface to Cellular device.

regards

Jean Fernandes
Coneel Brazil

 

[bogdanm]

Also check out this very good link:

hxxp://www.symonds.net/~catalyticideas/rat_ring/index.php?page=guide