Electroenthusiast
Active Member
I'm on a project where i need to obtain a DTMF signal from a call, DTMF signal will be pressed by the dialler(a person who calls the my telephone). What exactly i want to do is i need to obtain DTMF signal from the Telephone and input it to the Micro controller. I'm using HT9170B IC DTMF Decoder for the purpose, and it connects to the microcontroller. I'm okay with connecting 9170 circuit to the microcontroller and programming the Micro controller.
The problem is that the telephone would be dead when i do so, because i'm connecting the wires which (i would otherwise- before) be connected to phone. The telephone-connection would be always dead(cut). So i need to overcome this prob, i want the telephone connection to be on, and therefore receive the call only when a caller calls and switch off when the call is over(and the phone should not be dead at anytime).
Any idea about overcoming this?
The problem is that the telephone would be dead when i do so, because i'm connecting the wires which (i would otherwise- before) be connected to phone. The telephone-connection would be always dead(cut). So i need to overcome this prob, i want the telephone connection to be on, and therefore receive the call only when a caller calls and switch off when the call is over(and the phone should not be dead at anytime).
Any idea about overcoming this?
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