#define sw1 34
#define sw2 13
int count,keep;
bool on = true;
bool  off = false;

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(sw1, INPUT_PULLUP);
  pinMode(sw2, INPUT_PULLUP);
  lcd.init();
  Serial.begin(9600);
}

void loop() {
  int Power = digitalRead(sw1);
  int OK = digitalRead(sw2);
  
  if (on == true) {
    if (Power == 0) {
      delay(100);
      count++;
      if (count == 20) {
        ON();
      }
    }
    else {
      count = 0;
    }
  }

  if (off == true) {
    if (Power == 0) {
      delay(100);
      count++;
      keep = count;
      if (count == 20) {
        OFF();
      }
    }
    else {
      count = 0;
    }
    if (OK == 0 && keep >= 20) {
      lcd.clear();
      lcd.noBacklight();
      off = false;
      on = true;
      keep = 0;
    }
  }
  Serial.print("keep = ");
  Serial.print(keep);
  Serial.print(" : count = ");
  Serial.print(count);
  Serial.print(" : Power = ");
  Serial.println(Power);
}
void ON() {
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("    Welcome");
  lcd.setCursor(0, 1);
  lcd.print("  Now_Trun_ON");
  on = false;
  off = true;
}

void OFF() {
  lcd.setCursor(0, 0);
  lcd.print("    Trun_Off ??");
  lcd.setCursor(0, 1);
  lcd.print("   >>>Yes     ");
}