Connecting two Ardunio Uno's using SoftwareSerial

Projects Networking, Protocols, and Devices
1

Hi,

I'm currently trying to connect two Arduino Uno boards using software serial. I've looked over various example sketches and while I can see that it's possible I have seen no coherent solutions. I have been gradually scaling down what I am attempting to do and now am focused on simply sending a character.

Here is the code for the board sending the character:

#include <SoftwareSerial.h>

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

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


void loop() {
    SerialSend.write("h");
  delay(1000);
}

And here is the receiver code:

#include <SoftwareSerial.h>

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

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

void loop() {
    char c = mySerial.read();
    Serial.println(c);
    delay(500);
}

The receiving board displays a weird character (ASCII code 255) in the Serial monitor.
Am I seriously underestimating the amount of work that needs to be put in to make this work or am I getting something simple wrong?

Thanks in advance.

2

Is your serial monitor set to 9600?

3

Maybe have a look at the examples in Serial Input Basics - simple reliable ways to receive data.

You need to have a common GND connection between the two Arduinos.

...R