Two Nanos and Serial.read() _ Serial.write()

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@mikedb

two Nanos TX Pin to RX Pin

This link explains (briefly) the physical/electrical reason using hardware serial (Uno/Nano Tx/Rx/Pin0/Pin1) will not work.

Communication between two arduino UNO via Tx and Rx

You will not be able to send from the PC to an arduino when the Rx line of that arduino is connected to the Tx line of another arduino. The Tx from the USB-to-serial chip is fed to the Rx of the atmega328 through a resistor, the Tx from the other arduino will overpower the signal from the USB-to-serial chip and it will never reach the atmega328.

This link (shortly following the link above) says you should use software serial and shows how this will work.

Communication between two arduino UNO via Tx and Rx

You need an Example/Tutorial. Follow these steps, see the output, and then write your own sketch to reproduce the results. 1. Connect UNO-1 and UNO-2 as per diagram of Fig-1 using Software UART (SUART) Port. The Hardware UART Ports of both UNOs are engaged with PC/SM for sketch uploading and debugging. [uartUNO-UNO] Figure-1: 2. Upload the following sketch (not tested) in UNO-1 (Arduino-1). #include<SoftwareSerial.h> SoftwareSerial SUART(7, 8); //SRX = 7, STX = 8 void setup() { Seria…

AND... the following link shows how to use ONE Arduino (the example is using Mega2560) to configure TWO serial ports to do the tx/rx...

https://docs.arduino.cc/tutorials/communication/TwoPortReceive/