Just hook up an old rotary phone to pin 12 and GND of an arduino, upload the sketch and you will be able to see the digits you dial on the serial monitor. Of course you can change the timing and the pin.
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paulin1C/arduino_pulse_dialing_to_serial
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Just hook up an old rotary phone to pin 12 and GND of an arduino, upload the sketch and you will be able to see the digits you dial on the serial monitor.
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