int val_array[3] = {67, 65, 84};

void setup() {
  Serial.begin(9600);
  pinMode(2, OUTPUT);
  digitalWrite(2, HIGH);
  for(byte i = 0; i < 3; i++){
    Serial.println( val_array[i] );
  }

}

void loop() {
  for(byte j = 0; j < 3; j++){
    start_mark();
    for(byte i = 0; i < 8; i++){
      if(bitRead(val_array[j], i) == 0){
        send_0();
      }
      else{
        send_1();
      } 
    }
    end_mark();
  }  

}

void start_mark(){
  digitalWrite(2, LOW);
  delayMicroseconds(100);
}

void end_mark(){
  digitalWrite(2, HIGH);
  delayMicroseconds(100);
  Serial.println(' ');
}

void send_0(){
  digitalWrite(2, LOW);
  delayMicroseconds(100);
  Serial.print(0);
}

void send_1(){
  digitalWrite(2, HIGH);
  delayMicroseconds(100);
  Serial.print(1);
}