I would like to transform an old rotary telephone using an arduino micro + MT8880 to dial numbers coming either from the USB interface (serial), to dial straight from the computer, or from a number memorised with a shortcut dialed on the rotary dialer, or even from a number dialed on the rotary dialer. I would isolate the rotary dialer from the tel line, and read it straight with the arduino. The rest of the telephone stays same, just one button to tell the arduino to dial (when using the rotary dialer). The problem is to insert the tones from the MT8880 to the line; I guess I can not add a Transformator in serie or parallel to the actual one, can I? I thought of replacing with a relay the microphone with the audio from the MT8880 only when dialing, would this work? (note that there is only 3 wires coming from the micro and speaker, they are connected to the transformator with one common to both)
Any one having an idea?
Thanks!
Any one having an idea?
Thanks!