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This is a very basic example of SoftwareSerial. It reads in a byte at a time and mirrors it back to you:

    /*
      SoftwareSerial example

      Sample of the SoftwareSerial library.  Listens for serial in on pin 2
      and sends it out again on pin 3.

      by Tom Igoe
      based on examples by David Mellis and Heather Dewey-Hagborg
      written: 6 Jan 2007

    */

    // include the SoftwareSerial library so you can use its functions:
    #include <SoftwareSerial.h>

    #define rxPin 2
    #define txPin 3
    #define ledPin 13

    // set up a new serial port
    SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);
    byte pinState = 0;

    void setup()  {
      // define pin modes for tx, rx, led pins:
      pinMode(rxPin, INPUT);
      pinMode(txPin, OUTPUT);
      pinMode(ledPin, OUTPUT);
      // set the data rate for the SoftwareSerial port
      mySerial.begin(9600);
    }

    void loop() {
      // listen for new serial coming in:
      char someChar = mySerial.read();
      // print out the character:
      mySerial.print(someChar);
      // toggle an LED just so you see the thing's alive.
      // this LED will go on with every OTHER character received:
      toggle(13);

    }

    void toggle(int pinNum) {
      // set the LED pin using the pinState variable:
      digitalWrite(pinNum, pinState);
      // if pinState = 0, set it to 1, and vice versa:
      pinState = !pinState;
    }

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The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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