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Author Topic: Arduino Dial Up Modem shield  (Read 24048 times)
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@henry

No because the application is in the county and they only have a phone line . Also it may be handy for people who may want to log data and send very infrequently , an alarm event etc .. or some non often event ..  and a phone line is available  but not paid internet..
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@RIVA, yes it might be a good method for sure ..  This method is still used in some industries ..

I meant that the receiving arduinos do not pick phone up off hook and simply transmit the info via the ringing of the phone .. only the sending arduino dials but the call should be free because it is not picked up at other end ..
This means you could use the phone system without using the phone system ..
An interesting concept ..  I wonder if the same concept can be used on internet  systems .
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If you could find a way to send custom Caller ID (this sent before the phone rings, I think) then the arduino could decode this, at most the phone would only need to ring once.
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Nice idea..
Its amazing once you set up some basic challenges how people quickly start to create great ideas ...
It's like water dripping through cracks ..

Thanks for the idea s..
keep them coming and we might get some interest to build a few test ardunos ..
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 smiley-cool
Unfortunately  noone cared to pick this project otherwise we could have seen many interesting telephony related projects based on this idea e.g arduino based 4 port pbx its like arduino telephone exchange but none is interested
I tried to contact few shield venders they gave me estimated price of 1000 to 1200 USD which I cannot afford
Anyway whoever want to peruse please note along with modem chips CONEXANT also provide a complete circuit diagram for reference modem CSM92  ,all you need to do is to combine CONEXANT modem with Arduino

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Yes a good product idea gone dead.
I had looked into this in some detail and the next best option I could think of is a shield with telephone sockets and protection circuits ready to receive one of these plug in modules. They do several module types (dial-up, Ethernet & bluetooth) all using the same form factor so maybe the shield could be made universal.
I suspect the big problem/cost here is getting approval to connect to your phone line.
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@riva thankyou for appreciating this idea from start Yeah that MOUSER module looks interesting ,However in case of CONEXANT I don't think that we need any kind of "approval" check the attached document this is a complete document for CONEXANT serial reference modem with all circuit diagrams,BOM and finished product which is available from CONEXANT which means they have already provided an approved product all we need to do is to take that circuit as it is and give it an Arduino shape thats it (I donot know its legal implications though  smiley )
Just look into this document nothing is required to create from scratch

Link to CSM92 reference modem document
http://filesflash.com/19qv4mwc

reference modem daughter board and motherboard




Yes a good product idea gone dead.
I had looked into this in some detail and the next best option I could think of is a shield with telephone sockets and protection circuits ready to receive one of these plug in modules. They do several module types (dial-up, Ethernet & bluetooth) all using the same form factor so maybe the shield could be made universal.
I suspect the big problem/cost here is getting approval to connect to your phone line.
« Last Edit: April 13, 2014, 08:39:24 am by burraak » Logged

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Yet another simpler idea like yours is maybe this. It will probably fit into a shield footprint with the few additional components needed like speaker, switches to select serial port pins (hardware/software) and a couple of jumpers to optionally break out signals like RING, CTS.
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Wow... this is nice ... looks better than Conexant ,That means we have multiple (almost readymade) solutions to develop an Arduino Telephony base but it seems people are happy with their GSM shield  ..........  smiley-cry
By the way have you noticed it is one of the most viewed thread  smiley   even if you type "Arduino Modem" at google the concept image appears at first place  smiley which means it has some sale potential ............


Yet another simpler idea like yours is maybe this. It will probably fit into a shield footprint with the few additional components needed like speaker, switches to select serial port pins (hardware/software) and a couple of jumpers to optionally break out signals like RING, CTS.
« Last Edit: April 14, 2014, 03:29:35 pm by burraak » Logged

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Look at the recent kickstarter project and the guy's difficult & costly journey without arduino dialup modem sheild
https://www.kickstarter.com/projects/102287676/the-hangupmachine-a-spam-filter-for-your-phone?ref=category


« Last Edit: May 03, 2014, 05:40:31 am by burraak » Logged

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I have been using one of these for years now, works a treat though a little cumbersome to edit out numbers.
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BURRAAK, it's been almost a year since your original poste so I was wondering if you've made any progress?  I am working on a project in which I am in need of a very similar item.  Do you have any leads or suggestions on where I might find information to help me complete this?  I have a Mega connected to a MAX232 chip which is connected to a 56K faxmodem which connects to the phone line.  I have no working sketch yet and to be honest don't really know where to even begin.  Any help at all would be appreciated.
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BURRAAK, it's been almost a year since your original poste so I was wondering if you've made any progress?  I am working on a project in which I am in need of a very similar item.  Do you have any leads or suggestions on where I might find information to help me complete this?  I have a Mega connected to a MAX232 chip which is connected to a 56K faxmodem which connects to the phone line.  I have no working sketch yet and to be honest don't really know where to even begin.  Any help at all would be appreciated.

Sorry for the late reply actually I have stopped following this post,No I'm not doing anything with this It was just an idea which required someones attention who can invest 1200$ to 1500$  smiley  Unfortunatly it went down the drain  smiley-cry,
Anyway Its been almost a month since you made your post hopefully you have found a way all you need is your modem's AT commands and Arduino serial port programing to send commands and receive response thats it
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Barraak, Just to let you know, I did follow through with this and my project can be seen at
http://forum.arduino.cc/index.php?topic=249193.0
I still have some tweaking to do but for anyone who's interested, this gives a good head start.   smiley
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