#include <LiquidCrystal.h>
#include <math.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup(void)
{
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
}

float Getterm(int RawADC)
{
  float celsius = 1 / (log(1 / (1023. / RawADC - 1)) / 3950 + 1.0 / 298.15) - 273.15;
  return celsius;
}

float Filter(float x, int j)
{
  static float arr[3][10] = {0};
  float temp = 0;
  arr[j][0] = x;
  for(const auto& el : arr[j])
  {
    temp += el;
  }

  for(int i = 9; i > 0; i--)
  {
    arr[j][i] = arr[j][i-1];
  }
  return (temp/10);
}

float Average(float& temp1, float& temp2, float& temp3)
{
  return (temp1 + temp2 + temp3) / 3;
}

void loop(void)
{
  float temp1 = Filter(Getterm(analogRead(A0)), 0);
  float temp2 = Filter(Getterm(analogRead(A1)), 1);
  float temp3 = Filter(Getterm(analogRead(A2)), 2);

  lcd.clear();
  lcd.setCursor(1, 0);
  lcd.print("Max");
  lcd.setCursor(6, 0);
  lcd.print("Min");
  lcd.setCursor(12, 0);
  lcd.print("Avg");

  lcd.setCursor(0,1);
  lcd.print(max(max(temp1, temp2), temp3), 1);

  lcd.setCursor(5, 1);
  lcd.print(min(min(temp1, temp2), temp3), 1);

  lcd.setCursor(11, 1);
  lcd.print(Average(temp1, temp2, temp3), 1);

  delay(100);

}