#include <LiquidCrystal_I2C.h> //ของ wokwi
#define I2C_ADDR    0x27  //ของ wokwi
#define LCD_COLUMNS 16 //ของ wokwi
#define LCD_LINES   2 //ของ wokwi
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES); //ของ wokwi


unsigned long prevtime=0;
unsigned long elapetime=0;
unsigned long currentMillis ;
unsigned long seconds;
unsigned long minutes;
unsigned long hours;

int loadin_sensor=2;
int sw_stop=5;
int sw_start=6;
unsigned long settime=120000; 
bool mcstatus=0;
bool prevmcstatus=0;
void setup() {
  Serial.begin(9600);
  pinMode(loadin_sensor, INPUT);
  pinMode(sw_stop, OUTPUT);
  pinMode(sw_start, OUTPUT);
  lcd.begin(16, 2);
  lcd.clear();

	// Print a message to the lcd.
	//lcd.print("Custom Character");
}

void loop() {
  //Serial.println(digitalRead(2));
  if(digitalRead(loadin_sensor)==1){
    prevtime=millis();
  }
  else{
  //Serial.println(millis()-prevtime);
  elapetime=millis()-prevtime;
  //delay(200);
  }

  if(elapetime > settime){
    //Serial.println("Stop MC");
    lcd.setCursor(0, 1);
    lcd.print("STATUS:STOP ");
    //mcstatus=0;
    //digitalWrite(7, LOW);
    if(prevmcstatus==1){
      digitalWrite(sw_stop, HIGH);
      delay(500);
      digitalWrite(sw_stop, LOW);
      Serial.println("Switch Stop Trig");
    }
    prevmcstatus=0;
  }
  else{
    //Serial.println("Start MC");
    lcd.setCursor(0, 1);
    lcd.print("STATUS:START");
    //mcstatus=1;
    if(prevmcstatus==0){
      digitalWrite(sw_start, HIGH);
      delay(500);
      digitalWrite(sw_start, LOW);
      Serial.println("Switch Start Trig");
      
    }
    prevmcstatus=1;
    showtime();
  }
  
  
}
void showtime(){
  currentMillis = elapetime;
  currentMillis=settime-currentMillis; // นับเวลาถอยหลัง
  seconds = currentMillis / 1000;
  minutes = seconds / 60;
  hours = minutes / 60;
  //unsigned long days = hours / 24;
  currentMillis %= 1000;
  seconds %= 60;
  minutes %= 60;
  hours %= 24;

   lcd.setCursor(0, 0);
    if (minutes < 10) {
      lcd.print("0");
    }
    lcd.print(minutes);
    lcd.print(":");
    if (seconds < 10) {
      lcd.print("0");
    }
    lcd.print(seconds);
}