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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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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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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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

User · Answer

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

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

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