How To Make an Arduino Japanese Kotatsu (Heating Table)

//https://www.youtube.com/simpteam
//SIMP TEAM

#include <Wire.h>  
#include <LiquidCrystal_I2C.h>   
#include <sound_effect.h>  
#include <thermistor.h> 
#include <MsTimer2.h>  


LiquidCrystal_I2C lcd(0x27,16,2);  

int PotenTiometer = A0;  
int Thermistor = A1;  
int PotenTiometer_val;   
int Relay_Heating = 6;   
int Heating_LED = 2;  
int System_Switch = 4;  
float Temp; 

uint8_t clock[8] = {0x0, 0xe, 0x15, 0x17, 0x11, 0xe, 0x0};   
uint8_t heart[8] = {0x0, 0xa, 0x1f, 0x1f, 0xe, 0x4, 0x0};  

unsigned long this_time = millis();  
int this_state = 0;   


void setup() {   
  pinMode(Heating_LED, OUTPUT);    
  pinMode(System_Switch, INPUT_PULLUP);    )
  pinMode(Relay_Heating , OUTPUT);   

  digitalWrite(Relay_Heating, HIGH); 
  lcd.begin();   
  lcd.backlight();     
  lcd.clear();     
  delay(1000);     
  
  lcd.print("Hello, SIMP! ^0^"); 
  delay(500);   
  lcd.setCursor(0, 1);    
  lcd.print("KOTATSU MK1-2017");   
  seSqueak(13);   

  lcd.createChar(2, clock);    
  lcd.createChar(3, heart);  
  
  MsTimer2::set(14400000,timeout);  
  MsTimer2::start();   
}


void loop() {     


  if(digitalRead(System_Switch) == LOW) {    
    PotenTiometer_val = analogRead(PotenTiometer);    
    PotenTiometer_val = map(PotenTiometer_val, 0, 1023, 30, 40); 
    Temp = analogRead(Thermistor);   

    lcd.clear();    
    lcd.print("Temp : ");    
    lcd.print(ThermistorToC(Temp));   
    lcd.print("(");
    lcd.print(PotenTiometer_val);   
    lcd.print(")");
    lcd.setCursor(0, 1); 


    if(ThermistorToC(Temp)<PotenTiometer_val && this_state==0) {      
      digitalWrite(Relay_Heating, LOW);  
      digitalWrite(Heating_LED, HIGH);    
      lcd.print("Heating ON ");     
      lcd.write(3);    
    } 
    

    else{     
      digitalWrite(Relay_Heating, HIGH);  
      digitalWrite(Heating_LED, LOW);  
      lcd.print("Heating OFF ");    
      lcd.write(2);    
      this_state =1;    
    }
    delay(1000);  
  }
  
  
   if(ThermistorToC(Temp)>PotenTiometer_val || ThermistorToC(Temp)<PotenTiometer_val && this_state==1) {     
    if(this_time + 60000 < millis() ) {    
      this_time=millis();   
      this_state = 0;           
    }
  delay(1000);   
   }


   if(ThermistorToC(Temp)>50) {   
    lcd.clear();    
    lcd.print("Warning"); 
    delay(1000);    
    lcd.setCursor(0, 1);    
    lcd.print("High Temperature");   
    seAlarm(13);  
    digitalWrite(Relay_Heating, HIGH);    
   }


   if(digitalRead(System_Switch) == HIGH) {   
    lcd.clear(); 
    digitalWrite(Heating_LED, LOW);     
    digitalWrite(Relay_Heating, HIGH);   
    lcd.print("bye, SIMP! ^0^");   
    delay(1000); 
    lcd.setCursor(0, 1);    
    lcd.print("Sleep Mode");     
    delay(1000);    
   }
}

void timeout() {    
  digitalWrite(Relay_Heating, HIGH);    
  digitalWrite(Heating_LED, LOW);   
  lcd.clear();  
}