Sending "1byte" data - SUART

Objective: Here, we will learn the basics of how we can establish a SUART serial communication between 2 Arduinos and then send 1byte data(ex: 0x5B).

Hardware:

Here for both Arduinos Dpin-2 is working as Receiver and Dpin-3 is working as Transmitter.

Full Code:

ArduinoA (Sender)

#include <SoftwareSerial.h>
SoftwareSerial SUART(2, 3);   

void setup()
{
  Serial.begin(9600);   //Serial Monitor & MCU Communication starts
  SUART.begin(9600);    //ArduinoA & ArduinoB  Communication starts
}

void loop()
{ 
  SUART.write(0x5B);   //sending 1byte data(0x56) to other device   
  delay(10);
}

ArduinoB (Receiver)

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3); 

void setup()
{
Serial.begin(9600);     //Serial Monitor & MCU Communication starts
mySerial.begin(9600);   //Arduino Uno & Nano Communication starts
}

void loop()
{
  if( mySerial.available() ) 
  {
    byte x = mySerial.read();
    //Serial.println(x);      //shows decimal of 0x5B = 91
    Serial.println(x, HEX);   //shows 5B, the actual form
  }
  delay(10);
}

Code Explanation:

At Sender-

SoftwareSerial SUART(2, 3);

any name can replace "SUART", It works like a constant variable we call it when we need to work with UART Communication. Here we used- Rx(Dpin 2), Tx(Dpin 3).

At Receiverr-

SoftwareSerial mySerial(2, 3);

same, "mySerial" is just a name, any other name can be used.

if( mySerial.available() ) 

Checks if any serial data is received.

byte x = mySerial.read();

If there is any data, then it will read the data and store it to the x variable. As we are expecting only 1byte data, so x is declared a single-byte type data.

Result:

Serial.println(x); Serial.println(x, HEX);

(decimal) (HexaDecimal)

See More Examples:

Sending "float" data - SUART

Sending "String" data - SUART