How to convert int to string on Arduino

Question

How do I convert an int  n  to a string so that when I send it over the serial  it is sent as a string   This is what I have so far   int ledPin 13  int testerPin 8  int n 1   char buf 10    void setup         pinMode ledPin  OUTPUT       pinMode testerPin  OUTPUT       Serial begin 115200      void loop         digitalWrite ledPin  HIGH       sprintf buf   Hello  d   n       Serial println buf       delay 500       digitalWrite ledPin  LOW       delay 500        n

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Serial println val   Serial println val  format    for more you can visit to the site of arduino https   www arduino cc en Serial Println  wish this will help you  thanks

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This simply work for me   int bpm   60  char text 256   sprintf text   Pulso   d        bpm     now use text as string

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Here below is a self composed myitoa   which is by far smaller in code  and reserves a FIXED array of 7  including terminating 0  in char  mystring  which is often desirable  It is obvious that one can build the code with character-shift instead  if one need a variable-length output-string     void myitoa int number  char  mystring      boolean negative   number gt 0     mystring 0    number lt 0   -           number   number lt 0   -number   number    for  int n 5  n gt 0  n--         mystring n              if number  gt  0  mystring n    number 10   48       number    10          mystring 6  0

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Use like this   String myString   String n     You can find more examples here

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The solution is much too big  Try this simple one  Please provide a 7  character buffer  no check made    char  i2str int i  char  buf     byte l 0    if i lt 0  buf l     -     boolean leadingZ true    for int div 10000  mod 0  div gt 0  div  10       mod i div      i  div      if  leadingZ    i  0          leadingZ false         buf l    i  0             i mod        buf l  0    return buf      Can be easily modified to give back end of buffer  if you discard index  l  and increment the buffer directly

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You just need to wrap it around a String object like this   String numberString   String n     You can also do   String stringOne    Hello String                          using a constant String String stringOne    String  a                             converting a constant char into a String String stringTwo    String  This is a string              converting a constant string into a String object String stringOne    String stringTwo     with more        concatenating two strings String stringOne    String 13                             using a constant integer String stringOne    String analogRead 0   DEC             using an int and a base String stringOne    String 45  HEX                        using an int and a base  hexadecimal  String stringOne    String 255  BIN                       using an int and a base  binary  String stringOne    String millis    DEC                  using a long and a base

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You can simply do   Serial println n     which will convert n to an ASCII string automatically  See the documentation for Serial println

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This is speed-optimized solution for converting int  signed 16-bit integer  into string   This implementation avoids using division since 8-bit AVR used for Arduino has no hardware DIV instruction  the compiler translate division into time-consuming repetitive subtractions  Thus the fastest solution is using conditional branches to build the string   A fixed 7 bytes buffer prepared from beginning in RAM to avoid dynamic allocation  Since it s only 7 bytes  the cost of fixed RAM usage is considered minimum  To assist compiler  we add register modifier into variable declaration to speed-up execution    char  int2str 7   char  int2str  register int i       register unsigned char L   1    register char c    register boolean m   false    register char b      lower-byte of i      negative   if   i  lt  0          int2str  0      -       i   -i        else L   0       ten-thousands   if  i  gt  9999         c   i  lt  20000   1         i  lt  30000   2         3       int2str  L       c   48      i -  c   10000      m   true           thousands   if  i  gt  999         c   i  lt  5000           i  lt  3000               i  lt  2000   1   2                 i  lt  4000   3   4                   i  lt  8000             i  lt  6000               5               i  lt  7000   6   7                       i  lt  9000   8   9       int2str  L       c   48      i -  c   1000      m   true        else if  m    int2str  L        0        hundreds   if  i  gt  99         c   i  lt  500           i  lt  300               i  lt  200   1   2                 i  lt  400   3   4                   i  lt  800             i  lt  600               5               i  lt  700   6   7                       i  lt  900   8   9       int2str  L       c   48      i -  c   100      m   true        else if  m    int2str  L        0        decades  check on lower byte to optimize code    b   char  i      if  b  gt  9         c   b  lt  50           b  lt  30               b  lt  20   1   2                 b  lt  40   3   4                   b  lt  80             i  lt  60               5               i  lt  70   6   7                       i  lt  90   8   9       int2str  L       c   48      b -  c   10      m   true        else if  m    int2str  L        0        last digit    int2str  L       b   48       null terminator    int2str  L     0      return  int2str        Usage example  int i   -12345  char  s  void setup       s   int2str  i      void loop        This sketch is compiled to 1 082 bytes of code using avr-gcc which bundled with Arduino v1 0 5  size of int2str function itself is 594 bytes   Compared with solution using String object which compiled into 2 398 bytes  this implementation can reduce your code size by 1 2 Kb  assumed that you need no other String s object method  and your number is strict to signed int type    This function can be optimized further by writing it in proper assembler code

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use the itoa   function included in stdlib h  char buffer 7             the ASCII of the integer will be stored in this char array itoa -31596 buffer 10      integer  yourBuffer  base

[arduino] How to convert int to string on Arduino?

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