I have a general question about the Serial signal via the USB vs the signal via Software Serial.
The two of these obviously differ with the IO pins used.
In the case of the USB serial, say with a 5 volt Nano for example, we have pin D0 as RX.
And in the case of Software Serial - we use a different pin.
But isn't it true - that the incoming signal via USB simply passes through an onboard FT232RL and eventually ends up as a 5 volt signal at pin D0?
In such case, isn't it possible to connect a 5v serial signal directly to DO from a 2nd Arduino?
And it will receive serial signals at D0 just as accurately as it would if those signals passed through the onboard FT232RL?
Or is there a polarity flip in the signal which one would have to take into account?
Thanks in advance!