#define LED_PIN 3
#define button_PIN 2

static bool LED_State = false;
volatile bool flag = false;
unsigned long previousTime = 0;
unsigned long debounce = 50;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  pinMode(button_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(button_PIN),button_press,RISING);
  Serial.begin(9600);
}

void button_press(){
  flag = true;
}

void loop() {
  // put your main code here, to run repeatedly:
  //digitalWrite(LED_PIN, HIGH);

  
  //int reading = digitalRead(button_PIN);
  if(millis()-previousTime>debounce){
    previousTime = millis();
    if(digitalRead(button_PIN)&&flag){
      Serial.println("1");
      LED_State = !LED_State;
      digitalWrite(LED_PIN,LED_State);
      flag = false;
    }
  }
  

}