Binaire

http://playground.arduino.cc/Code/BitMath

http://www.binaryhexconverter.com/binary-to-hex-converter

 byte i;  
 for (i = 0x0; i <=0xFF; i++)  
 {  
  Serial.print(i);  
  Serial.print("=>");  
  Serial.print(i,BIN);  
  Serial.print("=>");  
  Serial.println(i, HEX);  
 }