int button_pin = 2;
int red_led = 12;

volatile int button_state = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(button_pin, INPUT);
  pinMode(red_led, OUTPUT);
  
  attachInterrupt(digitalPinToInterrupt(button_pin), btn_ISR, RISING);

  Serial.begin(9600);
}

void btn_ISR()
{
  button_state = !button_state;
  delay(30);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(red_led, true);
  analogWrite(11, 255);
  analogWrite(6, 255);
  delay(1000);
  analogWrite(10, 255);
  analogWrite(5, 255);
  delay(1000);
  analogWrite(9, 255);
  analogWrite(3, 255);
  delay(1000);
  
}