Serial Communication

PRINTING A CHARACTER

/* 

 * http://arduspot.blogspot.in/p/serial-communication.html

 */

void setup() 

{

  Serial.begin(9600);

  Serial.print('a');

}

void loop() 

{}

READ & PRINT A CHARACTER

/*
 * http://arduspot.blogspot.in/p/serial-communication.html
 */

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

void loop()
{
  if(Serial.available()>0)
  {
    Serial.print(Serial.read());
  }
}

PRINTING A STRING

/* 

 * http://arduspot.blogspot.in/p/serial-communication.html

 */

void setup() 

{

  Serial.begin(9600);

  Serial.print("Hello World");

}

void loop() 

{}

PRINTING A STRING - LOOP

/*
 * http://arduspot.blogspot.in/p/serial-communication.html
 */

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

void loop()
{
  Serial.println("Hello World");
}

PRINTING A VARIABLE

/* 

 * http://arduspot.blogspot.in/p/serial-communication.html

 */

int a = 5;

void setup() 

{

  Serial.begin(9600);

}

void loop() 

{

  Serial.print("a = ");

  Serial.println(a);

}

PARSING SERIAL DATA

/* 

 * http://arduspot.blogspot.in/p/serial-communication.html

 */

#include<String.h>

#define MAX_STRING_LEN 50

const char EOPmarker = '$';

char serialbuf[32];

int var1,var3,var2;

char* a;

char* b;

char* c;

void setup()

{

  Serial.begin(9600);

}

void loop() 

{

  if (Serial.available() > 0) 

  {

    static int bufpos = 0;

    char inchar = Serial.read();

    if (inchar != EOPmarker)

    {

      serialbuf[bufpos] = inchar;

      bufpos++;

    }

    

    else 

    {

      serialbuf[bufpos] = 0;

      bufpos = 0;

      

      a = subStr(serialbuf, ",", 1);

      b = subStr(serialbuf, ",", 2);

      c = subStr(serialbuf, ",", 3);

      

      var1 = atoi(a);

      var2 = atoi(b);

      var3 = atoi(c);

      

      Serial.println(var1);

      Serial.println(var2);

      Serial.println(var3);

    }      

  }

}

char* subStr (char* input_string, char *separator, int segment_number)

{

  char *act, *sub, *ptr;

  static char copy[MAX_STRING_LEN];

  int i;

  strcpy(copy, input_string);

  for(i = 1, act = copy; i <= segment_number; i++, act = NULL)

  {

    sub = strtok_r(act, separator, &ptr); 

    if (sub == NULL) break; 

  }

  return sub; 

}