Phone Interface
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Uploader Comments (BroHogan)
All Comments (8)
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@BroHogan Awesome, thanks.
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Can you have a phone dial the Arduino, have it answer, and wait for a key to be pressed todo something? I have to try this!!
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The DMMF dialer and decoder can actually be performed by the MCU, Arduino board in this case.
Semiconductor companies such as National Semiconductor, Motorola, etc, have published application notes of 8-bit MCU on using software to replace DTMF dialer and decoder. There are three different approaches. Only DAA is needed to interface to the landline.
For Arduino board, the only concern is the software latency of the open-source operating system to handle real-time signal processing.
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Programming the PIC, wiring the DTMF chip and getting that all to work was fairly straight forward.
But yes, interfacing to the phone line was the part that took the longest.
I ended up using a 1:1 (600ohm impeadance) transformer across the line, with a switch controled by the micro in series to "pick up". Then induced the signal onto the line.
I want to get back to making my remote relay card, just not enough time in the day!
Its cool how you have it interfaced to the computer.
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Um, the website in the description is broken...
AKSoapy29 3 months ago
@AKSoapy29 fixed
BroHogan 3 months ago
Nice work.
Playing around with DTMF chips is fun.
jakeontheweb 2 years ago
@jakeontheweb
Thanks. Yes they are fun - they "just work". However, the interface to the phone line was a can of worms for me. How did you do yours?
BroHogan 2 years ago