Objet Serial

Sur les internets on y trouve: 

/*

  ASCII table

  Prints out byte values in all possible formats:

  - as raw binary values

  - as ASCII-encoded decimal, hex, octal, and binary values

  For more on ASCII, see http://www.asciitable.com and http://en.wikipedia.org/wiki/ASCII

  The circuit: No external hardware needed.

  created 2006

  by Nicholas Zambetti <http://www.zambetti.com>

  modified 9 Apr 2012

  by Tom Igoe

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/ASCIITable

*/

void setup() {

  //Initialize serial and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  // prints title with ending line break

  Serial.println("ASCII Table ~ Character Map");

}

// first visible ASCIIcharacter '!' is number 33:

int thisByte = 33;

// you can also write ASCII characters in single quotes.

// for example, '!' is the same as 33, so you could also use this:

// int thisByte = '!';

void loop() {

  // prints value unaltered, i.e. the raw binary version of the byte.

  // The Serial Monitor interprets all bytes as ASCII, so 33, the first number,

  // will show up as '!'

  Serial.write(thisByte);

  Serial.print(", dec: ");

  // prints value as string as an ASCII-encoded decimal (base 10).

  // Decimal is the default format for Serial.print() and Serial.println(),

  // so no modifier is needed:

  Serial.print(thisByte);

  // But you can declare the modifier for decimal if you want to.

  // this also works if you uncomment it:

  // Serial.print(thisByte, DEC);

  Serial.print(", hex: ");

  // prints value as string in hexadecimal (base 16):

  Serial.print(thisByte, HEX);

  Serial.print(", oct: ");

  // prints value as string in octal (base 8);

  Serial.print(thisByte, OCT);

  Serial.print(", bin: ");

  // prints value as string in binary (base 2) also prints ending line break:

  Serial.println(thisByte, BIN);

  // if printed last visible character '~' or 126, stop:

  if (thisByte == 126) {    // you could also use if (thisByte == '~') {

    // This loop loops forever and does nothing

    while (true) {

      continue;

    }

  }

  // go on to the next character

  thisByte++;

}