volatile byte state = HIGH;
int btnPn = 2;
int led0 = 3;
int led1 = 6;
int led2 = 9;
int led3 = 12;

void setup() {
  pinMode(led0, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(btnPn, INPUT);
  Serial.begin(9600);
  Serial.println("test");
  attachInterrupt(digitalPinToInterrupt(btnPn), stopHammer, RISING);
}

void loop() {
  digitalWrite(led0, state);
  delay(250);
  digitalWrite(led0, !state);
  digitalWrite(led1, state);
  delay(250);
  digitalWrite(led1, !state);
  digitalWrite(led2, state);
  delay(250);
  digitalWrite(led2, !state);
  digitalWrite(led3, state);
  delay(250);
  digitalWrite(led3, !state);
}

void stopHammer(){
  Serial.println("  ,");
  Serial.println(" /(  ___________");
  Serial.println("|  >:==========='");
  Serial.println(" )(");
  Serial.println(" ''");
}