// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int analogValue;
float celsius;

void setup() {
  // setup pinmodes
  pinMode(A0, INPUT);
  for(int i=3; i<=6; i++){
    pinMode(i, OUTPUT);
  }

  // setup lcd
  lcd.init();
  lcd.backlight();
  // update lcd temp
  lcd.setCursor(0,0) ;
  lcd.print("Temp: ");
  lcd.setCursor(12, 0) ;
  lcd.print(" C");
  lcd.setCursor(0, 3) ;
  lcd.print("Amir Hasan Aref Asl");
  
}

void loop() {
  // read analog value
  analogValue = analogRead(A0);
  // calculate celsius degree
  celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
  // setup lcd
  // clear line 1 temp
  lcd.setCursor(6, 0) ;
  lcd.print("      ");
  lcd.setCursor(6, 0) ;
  lcd.print(celsius);

  // clear line 1 temp
  lcd.setCursor(0,1);
  lcd.print("          ");
  lcd.setCursor(0,1);


  if(celsius < 0){
    // too cold
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    // message
    lcd.print("Too Cold");
  }
  else if(celsius < 20){
    // cold
    digitalWrite(3, LOW);
    digitalWrite(4, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    // message
    lcd.print("Cold");
  }
  else if(celsius < 40){
    // warm
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    // message
    lcd.print("Warm");
  }
  else {
    // hot
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, HIGH);
    // message
    lcd.print("Hot");
  }

  delay(80);


}