Serial Communication of char from LilyPad to UNO

[carlopenasa]

Hello everyone,
I'm having big problems figuring out how to send through a virtual serial port a simple char from a LilyPad to an Arduino Uno.
When I open the serial monitor i just see an infinite sequence of question marks.
What could be the problem?
Thanks a lot in advance.

Code in the LilyPad:

#include <SoftwareSerial.h>
char comm;

void setup() {
  
  Serial.begin(9600); 
      
}

void loop() {  
     comm = 'a';
     Serial.write(comm);
  }

Code in the Arduino UNO:

#include <SoftwareSerial.h> 
#define SOFTRX 10
#define SOFTTX 11


SoftwareSerial SerialS(SOFTRX, SOFTTX);

char inbyte;

void setup() {  
  pinMode(SOFTTX, OUTPUT);
  pinMode(SOFTRX, INPUT);

  delay(3000);
  
  Serial.begin(19200);
  Serial.println("Ready to receive from Lilypad");
  
  SerialS.begin(19200);
}

void loop() {
  
  if (SerialS.available()>0)
  {
    inbyte=Serial.read();
    Serial.println(inbyte);
  }
 delay(10);
}

[UKHeliBob]

You have

Serial.begin(9600); 

on the LilyPad but

SerialS.begin(19200);

On the Uno, so the baud rates do not match

Then, to compound the problem you do this

  if (SerialS.available()>0)
  {
    inbyte=Serial.read();
    Serial.println(inbyte);
  }

so when a byte is available on the SoftwareSerial interface you read from the hardware Serial interface instead of the SoftwareSerial interface

Why did you #include SoftwareSerail.h on the LilyPad and then not use it ?

[carlopenasa]

I used different baud rates because doing some testing before using int variables and
Serialprint(SerialSread()) it worked just with these rates and setting the serial monitor to 19200.

Now i tried changing everything to 9600 and using inbyte=SerialS.read() but still in the serial monitor I don't recive the char a, just "blank" spaces.

[UKHeliBob]

Did you fix the problem on the Uno where you check for available data on one serial interface and if it is present you read from a completely different one ?

[sterretje]

@carlopenasa, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project See About the Installation & Troubleshooting category.