Thermal Printer Example

bool buttonpressed = false;
int button = 30;

void setup() {
  //setup button on board
  pinMode(button, INPUT);

  Serial1.begin(19200); // Use this instead if using hardware serial

  //Print Settings-----------------
  //Modify the print speed and heat
  Serial1.write(27);
  Serial1.write(55);
  Serial1.write(7); //Default 64 dots = 8*('7'+1)
  Serial1.write(255); //Default 80 or 800us
  Serial1.write(255); //Default 2 or 20us

  //Modify the print density and timeout
  Serial1.write(18);
  Serial1.write(35);
  int printSetting = (15<<4) | 15;
  Serial1.write(printSetting); //Combination of printDensity and printBreakTime
  //-------------------------------
}

void Print()
{
  //printed lines
  Serial1.println("Hello World!");
  Serial1.println("(0.o)");

  delay(3000L);         // Sleep for 3 seconds
}

void loop()
{
  if(digitalRead(button))
  {
    if(!buttonpressed){
    Print();
    buttonpressed = true;
    }
  } else {
    buttonpressed = false;
  }

}