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Thanks. Somehow code example No3 works correctly. I have used a library for timer and simplified code from the answer above.

#include <LiquidCrystal_I2C.h>
#include <millisDelay.h> // Timer
#define button_pd 6
LiquidCrystal_I2C lcd(0x27, 16, 2);
int k = 0;
int cnt = 0;
uint8_t previous_state; // previous state of the button
millisDelay d;
void setup() {
 pinMode(button_pd, INPUT_PULLUP);
 lcd.init();
 lcd.backlight();
 lcd.clear();
 lcd.setCursor(0, 0);
 lcd.print(cnt);
}
void loop() {
 uint8_t state = digitalRead(button_pd);
 if (state == LOW)
 d.start(300);
 previous_state = state;
 if (d.justFinished()) {
 cnt = cnt + 1;
 lcd.clear();
 lcd.setCursor(0, 0);
 lcd.print(cnt);
 }
}

Thanks. Somehow code example No3 works correctly. I have used a library for timer and simplified code from the answer above.

#include <LiquidCrystal_I2C.h>
#include <millisDelay.h> // Timer
#define button_pd 6
LiquidCrystal_I2C lcd(0x27, 16, 2);
int k = 0;
int cnt = 0;
//uint8_t previous_state; // previous state of the button
millisDelay d;
void setup() {
 pinMode(button_pd, INPUT_PULLUP);
 lcd.init();
 lcd.backlight();
 lcd.clear();
 lcd.setCursor(0, 0);
 lcd.print(cnt);
}
void loop() {
 uint8_t state = digitalRead(button_pd);
 if (state == LOW)
 d.start(300);
 //previous_state = state;
 if (d.justFinished()) {
 cnt = cnt + 1;
 lcd.clear();
 lcd.setCursor(0, 0);
 lcd.print(cnt);
 }
}