HOW TO USE ANY ARDUINO DIGITAL PINS TO EMULATE SERIAL (SOFTWARE SERIAL)

This post helps you to understand and use software serial implantation in any Arduino. BY using digital pins other than 0,1 .

Why do we need extra serial pins? When we have serial at 0, 1 pins on Uno. Well sometimes you need many as possible as you can, because the default Tx,Rx(0,1) are always reserved for pc communications sometimes if we force to use it as debug it might throw an error also!

That’s why we need additional serials as possible.

Here is an excuse..! for using software serial to put hc05 Bluetooth to at command mode:

notice if i use the default serial to communicate it might throw an error while uploading.

 here is a link for software serial project...

#include <SoftwareSerial.h> // this library is default installed in //Arduino ide
// defining Tx and Rx pins (we can use only digital pins and analog //pins)
#define RX_PIN 7
#define TX_PIN 8
SoftwareSerial swSer (RX_PIN, TX_PIN); //here the swSer is the //name of serial function we use whatever name you want
int state;
void setup() {
  Serial.begin(9600);
  Serial.println("enter cmds:");
  swSer.begin(38400);
}
void loop() {
  if (swSer.available())
    Serial.write(swSer.read());
  if (Serial.available())
    swSer.write(Serial.read());
}