/* Software serial multiple serial test Receives from the two software serial ports, sends to the hardware serial port. In order to listen on a software port, you call port.listen(). When using two software serial ports, you have to switch ports by listen()ing on each one in turn. Pick a logical time to switch ports, like the end of an expected transmission, or when the buffer is empty. This example switches ports when there is nothing more to read from a port The circuit: Two devices which communicate serially are needed. * First serial device's TX attached to digital pin 10(RX), RX to pin 11(TX) * Second serial device's TX attached to digital pin 8(RX), RX to pin 9(TX) Note: Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69 Not all pins on the Leonardo support change interrupts, so only the following can be used for RX: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI). created 18 Apr. 2011 modified 19 March 2016 by Tom Igoe based on Mikal Hart's twoPortRXExample This example code is in the public domain. */ #include <SoftwareSerial.h> // software serial #1: RX = digital pin 10, TX = digital pin 11 SoftwareSerial portOne(10, 11); // software serial #2: RX = digital pin 8, TX = digital pin 9 // on the Mega, use other pins instead, since 8 and 9 don't work on the Mega SoftwareSerial portTwo(8, 9); void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } // Start each software serial port portOne.begin(9600); portTwo.begin(9600); } void loop() { // By default, the last initialized port is listening. // when you want to listen on a port, explicitly select it: portOne.listen(); Serial.println("Data from port one:"); // while there is data coming in, read it // and send to the hardware serial port: while (portOne.available() > 0) { char inByte = portOne.read(); Serial.write(inByte); } // blank line to separate data from the two ports: Serial.println(); // Now listen on the second port portTwo.listen(); // while there is data coming in, read it // and send to the hardware serial port: Serial.println("Data from port two:"); while (portTwo.available() > 0) { char inByte = portTwo.read(); Serial.write(inByte); } // blank line to separate data from the two ports: Serial.println(); }