| T O P I C R E V I E W |
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Posted - Jun 30 2003 : 11:02:21 PM
Hello all of you!
I am in the need of a "telephone dialer" for a system. When a flood happen or i.e. a smoke detector is activated, I want a device to call my Cellular Phone or any other phone number. The system works actually with a part of the circuit of an ordinary phone (the "redial" section" but I prefer a real dialer). And I do not want to be connected to a computer to do the dialing! Anyone informed about a chip called a dialer or a circuit including a dialer? Please let me know!
Bye now, André
Edited by - Andre45 on Jun 30 2003 11:09:19 PM |
| 14 L A T E S T R E P L I E S (Newest First) |
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Posted - Aug 08 2003 : 08:03:17 AM
You could use the redial function as stated, but solder two wires riectly to the redial button (on the inside to PCB board), and have thoes wires going directly to the fire alarm on either side of the little glass type gas chamber (this changes form when some/fire is detected and makes completes the circuit)...
on second thought the phone has to work if the redial button is held down, and slightly impractical
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| Brian |
Posted - Aug 07 2003 : 03:38:09 AM
As Aaron said, a tape recorder should do quite well. Just record the correct tones and then a message that is repeated a few times. You could use some sort of solenoid to press the play button.
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| BEatonNo1 |
Posted - Jul 10 2003 : 11:42:35 PM
could you use a relay in inline with the firedetector though instead of on each button
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| YS |
Posted - Jul 10 2003 : 11:19:40 PM
I agree, activating an old phone would be the simplest (if not the most elegant) solution. The only trick is - these simple phones are not isolated from phone line. And your security equipment is probably grounded..
So, it would be safer if you use relays or optoisolators to activate buttons.
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| BEatonNo1 |
Posted - Jul 10 2003 : 5:37:08 PM
I cannot seem to find a datasheet for that particular chip...
one idea would be for you to find an old phone with a redial function and/or memory. then have a circuit that would simulat pushing the buttons when the firealarm was activated. this could be a circuit that could pulse different outputs (turn on phone, redial, play a recording). even easier, you could just record the tones like Aaron mentioned, however, doing this, there is a chance that they might not be recognised. it would be alot bulkier than using a single pic, but it would get the job done
Edited by - BEatonNo1 on Jul 10 2003 5:48:52 PM |
| Aaron Cake |
Posted - Jul 10 2003 : 09:14:51 AM
I certainly read your first post, and at the very least you are going to need some minimal intelligence (ie. PIC, Basic STAMP) to do this. A side effect is that (as has already been mentioned) most PICs have PWM or DTMF circuits built in for generating the tones. Now all you have to do is interface to the phone line...
If you want to get REALLY simple, just use a tape recorder with the tones and play them into the phone line.
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| n/a |
Posted - Jul 09 2003 : 11:19:51 PM
Hello everyone :)
First, I am considering me very lucky to be a part of Aaron's Forum and I thank you all to devote yourself for "Everybody's Problems" by investing your time and effort to help.
Second: Aaron, I am sure people really read your posts carefully! Everyone know you are so devoted in anyway you can help, I am convinced if they dont read carefully your posts the first time, the second time they will.
Third: The DIALER i need is a direct dialer, no computer nor PICs, a "chip" dialer to connect a phone keyboard to program a phone number. (Have you read carefully my first post LOL) i.e. if the fire alarm is triggered in my house and I'm away, I would like a dialer to phone my cellular phone. Actually, the one most suitable for me is the SANYO LC737212M. But I am still searching for a circuit. Any ideas???? Everyone's welcomed!!!!!!!!!! Bye now and keep going on posting !! Bye! André45
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| Aaron Cake |
Posted - Jul 09 2003 : 09:27:30 AM
Sometimes I wonder if people are even reading my posts. 
As I mentioned above, all you need to do is open the COM port the modem is connected to (you can use the MSCOMM control in VB) and send "ATDT 666-6666". That will dial the number.
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| BEatonNo1 |
Posted - Jul 09 2003 : 03:59:48 AM
If you want to use your computer, I know that there are numerous programms out there that can do this (don't know any names though).
Have you ever seen the code that the computer uses to interface with the modem, its pretty simple set of commands. once you can interface with your modem port then you just need to send these commands
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| n/a |
Posted - Jul 09 2003 : 02:50:02 AM
i already have a modem.
Is there any other way aside from using an old model modem? Im using VisualBasic.
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| BEatonNo1 |
Posted - Jul 08 2003 : 12:54:15 PM
I have seen people use a PIC. the tones are created using PWM but you could also use the tone generating function to.
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| Aaron Cake |
Posted - Jul 08 2003 : 09:05:24 AM
What comes to mind immediately is an old external modem (free or very cheap) run by a microcontroller/PIC. Should be VERY simple to send a serial signal saying "ATDT 666-6666" to the modem using any modern CPU. The BASIC Stamp comes to mind immediately.
To the other poster, dialing with a computer is very easy if you have a modem. But the specifics will depend on what language you are programming in.
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| n/a |
Posted - Jul 08 2003 : 06:27:21 AM
andre45, you mentioned that you dont want the computer to do tthe dialing.. May i know how to dial using the computer?
like, making a program ro automaticatlliy dial a phone..
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| BEatonNo1 |
Posted - Jul 01 2003 : 5:35:44 PM
this site could provide some information (http://www.boondog.com/tutorials/dtmf/dtmf.htm)
Edited by - BEatonNo1 on Jul 01 2003 5:37:51 PM
Edited by - BEatonNo1 on Jul 08 2003 12:54:57 PM |
