#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd (0x27,16,2);
int buttonPin = 35;
int numberKeyPresses = 0;
bool pressed = false;
volatile unsigned long button_time = 0;
volatile unsigned long last_button_time = 0;
int counter = 0;
int state = 0;

void IRAM_ATTR count() {
  button_time = millis();
  if(button_time - last_button_time > 250){
    numberKeyPresses++;
    pressed = true;
    last_button_time = button_time;
  }
  state = 1;

}

void setup() {
  pinMode(5, OUTPUT);
 pinMode(34, INPUT_PULLUP); 
Serial.begin(115200);
pinMode (35, INPUT_PULLUP);
attachInterrupt (35, count, RISING);
lcd.init();
lcd.backlight();

}

void loop() {
  for(int i = 0; i < 11; i++){
  lcd.setCursor(1,0);
  lcd.print("counter:"); lcd.print(i);
  delay(1000);
}
  digitalWrite(5,state);
if (pressed) {
Serial.println("Button has been pressed " + String (numberKeyPresses) + "times");
pressed = false;
}
}