Arduino_Button_Debounce_for_interrupts

Debounce.ino

const byte led_pin = LED_BUILTIN;
const byte interrupt_pin = 2;
volatile byte state = LOW;

unsigned long interrupt_time = millis();
const unsigned long delay_time = 50; // Delay for every push button may vary

void setup() {
  pinMode(led_pin, OUTPUT);
  pinMode(interrupt_pin, INPUT_PULLUP);
  
  attachInterrupt(digitalPinToInterrupt(interrupt_pin), blynk, LOW);
}

void loop() {
  digitalWrite(led_pin, state);
}

void blynk() {
  if ((millis() - interrupt_time) > delay_time) {
    // Recommend to not to change the position of this line
    interrupt_time = millis();

    // Interrupt function lines
    state = !state;
  }
}