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Topic: Software Serial library + example compile errors (Read 1 time) previous topic - next topic


I just tried IDE 1.0.3 and then 1.5.2.  In both cases if I open "SoftwareSerialExample" and run Sketch->Verify/Compile, I get errors.  I'm not able to use SoftwareSerial anymore at this point. I don't have clue what these errors mean.

In file included from SoftwareSerialExample.ino:28:
C:\Users\Doug\Documents\Arduino\libraries\SoftSerial/SoftwareSerial.h:95: error: conflicting return type specified for 'virtual void SoftwareSerial::write(uint8_t)'
C:\arduino-1.5.2\hardware\arduino\avr\cores\arduino/Print.h:48: error:   overriding 'virtual size_t Print::write(uint8_t)'

This is the example code (nothing has been changed. Exactly as it is from a fresh zip file):
Code: [Select]
  Software serial multple serial test

Receives from the hardware serial, sends to software serial.
Receives from software serial, sends to hardware serial.

The circuit:
* RX is digital pin 10 (connect to TX of other device)
* TX is digital pin 11 (connect to RX of other device)

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 back in the mists of time
modified 25 May 2012
by Tom Igoe
based on Mikal Hart's example

This example code is in the public domain.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup() 
  // Open serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only

  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.println("Hello, world?");

void loop() // run over and over
  if (mySerial.available())
  if (Serial.available())


Looks like you have a third-party SoftwareSerial library installed in C:\Users\Doug\Documents\Arduino\libraries\SoftSerial

Get rid of it.
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