//www.diyusthad.com
#include <LiquidCrystal.h>

const int rs = A0, en = A1, d4 = 9, d5 = 10, d6 = 11, d7 = 12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

#define movAvgcnt 40          //amount of moving average cycles
#define AnTempInPin A2          // Voltage of temerature sensor In analogue
#define IntrptPin 13

int val = 0;
int Tarr[movAvgcnt];
int Tmax = -1260;
int Tmin = 1270;
bool IntrptBtnPressed = false;
long Tacc = 0;
unsigned int Tcount = 0;


void setup() {
  int TempVIn = 0;      //Voltage of tepmerature sensor
 
 pinMode(AnTempInPin, INPUT);
 //pinMode(IntrptPin, INPUT_PULLUP);
 //attachInterrupt(digitalPinToInterrupt(IntrptPin), button_ISR, LOW);
  
  lcd.begin(16, 2);

  for (byte i1 = 0; i1 < movAvgcnt; i1++) {
    TempVIn = analogRead(AnTempInPin);
    Tarr[i1] = TempVIn;
  }
  Tmin=GetTempPT1000Sensor(Average(Tarr, movAvgcnt));
  Tmax=GetTempPT1000Sensor(Average(Tarr, movAvgcnt));

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("min:");
  lcd.setCursor(8,0);
  lcd.print("max:");
  lcd.setCursor(0,1);
  lcd.print("Act:");
  lcd.setCursor(8,1);
  lcd.print("Avg:");
  

}

void loop() {
  int TempVIn = 0;      //Voltage of tepmerature sensor
  float Temp = 0;
  float Tavg = 0;
  
  MoveArrDataLeft(Tarr, movAvgcnt);
  TempVIn = analogRead(AnTempInPin);
  Tarr[movAvgcnt - 1] = TempVIn;
  Temp = GetTempPT1000Sensor(Average(Tarr, movAvgcnt));
 // Temp = Average(Tarr, movAvgcnt);

  if (Tmax < Temp) {
    Tmax = Temp;
  }
  if (Tmin > Temp) {
    Tmin = Temp;
  }
    Tcount++;                   //Tcount=Tcount+1
    if (Tcount==65530) {
      Tacc=0;
      Tcount=1;
  }
    Tacc += Temp;               //Tacc=Tacc+Tarr[movAvgcnt-1]
    Tavg = Tacc / Tcount;
    
    
 // lcd.clear();
  lcd.setCursor(4,0);
 // lcd.print("    ");
  lcd.setCursor(4,0);
  lcd.print(dtoTempStr(Tmin));
  lcd.setCursor(12,0);
 // lcd.print("    ");
  lcd.setCursor(12,0);
  lcd.print(dtoTempStr(Tmax));
  lcd.setCursor(4,1);
//  lcd.print("Act:");
  lcd.print(dtoTempStr(Temp));
  lcd.setCursor(12,1);
//  lcd.print("Avg:");
  lcd.print(dtoTempStr(Tavg));
  delay(10);
}

void MoveArrDataLeft(int T[], byte Ubnd) {
  // the array is passed as a pointer by the menas of 'varName[]' (any value inside the array barckets are ignored ie. 'varName[10]' = 'varName[]')
  // any changes in the array remain after the function has been finsihed
  for (byte  i = 0; i < (Ubnd - 1); i++) {
    T[i] = T[i + 1];
  }
}

float Average(int T[], byte UBnd) {
  float Tvar = 0;
  for (byte i = 0; i < UBnd; i++) {
    Tvar += T[i];
  };
  Tvar = Tvar / (float)UBnd;
  return Tvar;
}

float GetTempPT1000Sensor(int R) {
 return 0.506*R-50.237;
}

String dtoTempStr(float Temp){
  char s[4];
  if (Temp<100) {
    dtostrf(round(Temp*10)/10,2,1,s);
  }
  
  if (Temp<10) {
    dtostrf(round(Temp*10)/10,1,1,s);
    s[3]=" ";
    s[4]=0;
  }
  

  if (Temp>=100) {
    dtostrf(round(Temp),3,0,s);
    s[3]=" ";
    s[4]=0;
  }
  return s;
}