//const byte text[7] = {0xAA, 0xA7, 'H', 'E', 'L', 'L', 'O'};

//testing:
//const byte text[7] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
//const byte text[7] = {0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF};
//const byte text[7] = {0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55};

void setup() {
  DDRD=(1<<4); // set pin D4 output
}

void loop() {
for(int i=0; i<7; i++){
  for(int j=7; j>=0; j--){
    byte temp = text[i]&(1<<j); 
    if( temp ) {
      PORTD|=(1<<4);
      delay(75); // bit time
    } else{
        PORTD&=~(1<<4);
    delay(75); // bit time
  }
}
}
PORTD&=~(1<<4);
delay(1000);
}