#define ArrLen(x)         (sizeof(x)/sizeof(x[0]))

String s = "\u2588";
const char* ae_lo = "\u00E6"; // æ
const char* ae_up = "\u00C6";
char hex[3];

const char str[] = "\u00E6\u00C6";

const char* letters[] = {
  "\u00E6", "\u00C6", // æ / Æ
  "\u00F8", "\u00D8", // ø / Ø
  "\u00E5", "\u00C5"  // å / Å
};

const char* t9[3][3] = {
  {"\u00E6", "\u00F8", "\u00E5"},
  {"\u00C6", "\u00D8", "\u00C5"},
  {"","",""},
};

const char myTxt[] = "abcdefghijklmnopqrstuvwxyz\u00E6\u00F8\u00E5";

const char* getAscii(char* str, char dst[] = hex) { 
  strcpy(dst, str);
  dst[2] = '\0';
  return (const char*)dst;
}

int16_t parseHexChar(const char* hexStr) {
  return (int16_t)strtol(hexStr, NULL, 16);
}

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

  for (int i=0; i<strlen(myTxt); i++) {
    if (!isAscii(myTxt[i])) {
      const char* ae = getAscii( &(myTxt[i++]) );
      Serial.println(i), Serial.print(": "),
      Serial.println(ae);
    }
  }
    
const char* aee = &(hex[0]);
Serial.print("ae: "); Serial.println(aee);

unsigned char hx[2];
hx[0] = hex[0];
hx[1] = hex[1];

Serial.println(hx);
/*
char buffer[3];
unsigned char number[2];
memcpy(number, 2, hex);
sprintf(buffer, "%02X", number);
Serial.print("sprintf: "); Serial.println(buffer);
Serial.println("\xC3");

  const char* ae = getAscii( &(myTxt[26]) );
  Serial.print("ae:    "); Serial.println(atoi(ae));

  Serial.print("int:   "); Serial.println(parseHexChar("E5"));

  char tx_data[3];
  sprintf(tx_data, "%02X", ae);
  Serial.println(tx_data);

char x[] = "\xE6";
long y = strtol(&x[3], 0,16);
Serial.println(y);
*/
  /*
  Serial.print("ae[0]: "); Serial.println((int)ae[0], HEX);
  Serial.print("ae[1]: "); Serial.println((int)ae[1], HEX);
  Serial.println("\xE6");
  int hexbyt = 0xE6;
  Serial.write(hexbyt);


  uint8_t src = 0xE6; 		  // source byte ( DEC 107 | BIN 0b1101011 )

	src &= 0b1111;      		  // isolate lower 4 bits with bitmask; result: 1011 	
	src  = src & (1 << 8)-1;   // isolate 6 lower bits; result: 101011

  Serial.println(src, HEX);
  */
  //getAscii("hello mate!", 6);

  //Serial.println(getAscii(myTxt, 26));
/*
  while(1);

 for (int i=0; i<strlen(myTxt); i++)
  if (!isAscii(myTxt[i]))
    Serial.print(i), Serial.print(" "), Serial.println(myTxt[i]);

  while(1);

  for (int i=0; i<strlen(myTxt); i++) {
    Serial.print(myTxt[i]);
    Serial.print(",");
    //Serial.println(isAscii(myTxt[i]));
  }
  Serial.println();

  for (int i=0; i<strlen(myTxt); i++) {
    Serial.print((isAscii(myTxt[i]))?"1":"0");
    Serial.print(",");
    //Serial.println(isAscii(myTxt[i]));
  }
  Serial.println();
  */
  /*
  Serial.println(str);
  for (int i=0; i<ArrLen(letters); i++) {
    Serial.println(letters[i]);
  }

  Serial.println(letters[0][0]);
  */
  /*

  Serial.println(s);
  Serial.println(ae_lo);

  strcpy(hex, ae_lo);
  Serial.println(hex);
  Serial.print(hex[0], HEX); Serial.print(" "); Serial.println(hex[1], HEX);
  Serial.print(0xC3); Serial.print(" "); Serial.println(0xA6);
  Serial.print((char)195); Serial.print(" "); Serial.println((char)166);
  */
}

void loop() {
  // put your main code here, to run repeatedly:

}