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

  // prints title with ending line break 
  Serial.println("Base Conversion Example"); 
} 

uint16_t x;
uint8_t base = 2;

// where we will place the digits of x
int16_t Digits[32];
int16_t num_digits;

void loop()
{
  uint16_t y;
  uint16_t digit;
  uint16_t dig_pos;
  
  x = -1;
  
  Serial.print("Converting ");
  Serial.print(x, DEC);
  Serial.print(" into base ");
  Serial.print(base, DEC);
  Serial.println("");
  
  y = x;
  dig_pos = 0;
  num_digits = 0;
  while (y > 0) {
    // extract out rightmost base B digit
    digit = y % base;
    y = y / base; 
    // and put it into digit position dig_pos
    Digits[dig_pos] = digit;
    dig_pos++;  // next position
    num_digits++;  // count this digit
  }
  
  // now print out the digits left to right
  for (dig_pos = num_digits-1; dig_pos--; dig_pos >=0) {
    Serial.print(Digits[dig_pos], DEC);
    Serial.print(" ");
  }
  Serial.println("");
    
  delay(1000);
}