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

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

#define N 10

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

void Avg(float temp, int &min, int &max, int &avg){
  static byte index = 0;
  static float arr[N];
  arr[index] = temp;
  if(index++ >= N){
    index = 0;
  }

  float avgFl;
  float minFl = 100;
  float maxFl = -100;
  for(int i = 0; i < N; i++){
    avgFl += arr[i];

    if(minFl > arr[i]){
      minFl = arr[i];
    }
    if(maxFl < arr[i]){
      maxFl = arr[i];
    }
  }

  min = static_cast<int>(minFl);
  max = static_cast<int>(maxFl);
  avg = static_cast<int>(avgFl / N);
}


void setup()
{
  Serial.begin(9600);
  pinMode(A0, INPUT);
  lcd.begin(16, 2);
  lcd.print("Min | Mid | Max");
}

 
void loop()
{
  static int minTemp;
  static int avgTemp;
  static int maxTemp;
  Avg(Getterm(analogRead(A0)), minTemp, maxTemp, avgTemp);
  Avg(Getterm(analogRead(A1)), minTemp, maxTemp, avgTemp);
  Avg(Getterm(analogRead(A2)), minTemp, maxTemp, avgTemp);

  lcd.setCursor(0, 1);
  lcd.print("                ");
  lcd.setCursor(0, 1); lcd.print(minTemp);
  lcd.setCursor(4, 1); lcd.print("|");
  lcd.setCursor(6, 1); lcd.print(avgTemp);
  lcd.setCursor(10, 1); lcd.print("|");
  lcd.setCursor(12, 1); lcd.print(maxTemp);

  delay(100);
}