#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
uint8_t clock[8] = {0x0, 0xe, 0x15, 0x17, 0x11, 0xe, 0x0};
const int switch_on = 2, input_off_time = 3, output = 9;
int off_timer_start = 0, offtime = 0;
void setup() {
  pinMode(switch_on, INPUT);
  pinMode(input_off_time, INPUT);
  pinMode(output, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(6, 0);
  lcd.print("OFF       ");
  lcd.createChar(2, clock);
  lcd.setCursor(0, 1);
  lcd.write(2);
  lcd.print((String)" " + offtime + " ");
}

void loop() {
  int x = ((millis() / 1000) - off_timer_start)/60;
  if (x <= offtime && digitalRead(output) == HIGH) {
    int m = ((offtime * 60) + off_timer_start - (millis() / 1000))/60;
    int s = ((offtime * 60) + off_timer_start - (millis() / 1000))%60;
    lcd.setCursor(10, 0);
    lcd.print((String)" " + m + ":" + s +" ");
  }
  if (digitalRead(switch_on) == HIGH) {
    digitalWrite(output, HIGH);
    off_timer_start = millis() / 1000;
    lcd.setCursor(6, 0);
    lcd.print("ON        ");
  } else if (x >= offtime && digitalRead(output == HIGH)) {
    digitalWrite(output, LOW);
    lcd.setCursor(6, 0);
    lcd.print("OFF       ");
  }
  while (digitalRead(input_off_time) == HIGH) {
    if (offtime <= 29) { //change max time limit
      offtime += 1; //change increment by x
    } else {
      offtime = 0;
    }
    lcd.setCursor(0, 1);
    lcd.write(2);
    lcd.print((String)" " + offtime + " ");
    delay(500);// adjust speed of incrementing
  }
}