//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

// Declaration of global variables

int analogPin_0 = A0;
int analogVal_0 = 0;  // Variable to store the value read
int Temperatur_0 = 0; // Actual temperature 
int Temp_max_0 = 0;   // Maximum temperature 

int analogPin_1 = A1;
int analogVal_1 = 0;  // variable to store the value read
int Temperatur_1 = 0; // Actual temperature
int Temp_max_1 = 0;   // Maximum temperature


int analogPin_2 = A2;
int analogVal_2 = 0;  // variable to store the value read
int Temperatur_2 = 0; // Actual temperature 
int Temp_max_2 = 0;   // Maximum temperature

int analogPin_3 = A3;
int analogVal_3 = 0;  // variable to store the value read
int Temperatur_3 = 0; // Actual temperature 
int Temp_max_3 = 0;   // Maximum temperature

const float vt_factor = 2.0;  // Correction factor
const float offset = 0;       // Offset

bool Reset = false;
unsigned long TimeAct, TimePrev;
unsigned short Timer_1;
bool Pulse_1s;
unsigned long Task_Timer_1;


#define Reset_BUTTON 13

// ------------------------------------------------------
// SETUP
// ------------------------------------------------------

void setup()
{
  pinMode(Reset_BUTTON, INPUT_PULLUP);
  Serial.begin(9600);
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(5,0);
  lcd.print("POWERED BY");
  lcd.setCursor(7,1);
  lcd.print("AMU LTD");
}

// ------------------------------------------------------
// TASKS
// ------------------------------------------------------

void Pulse()              // Generates a pulse every second
{TimeAct = millis();      // Millis value between  0 and  655535
  Pulse_1s = false;
  if (  ( (TimeAct > TimePrev) and (TimeAct - TimePrev) > 1000) or ((TimeAct < TimePrev) and (65535 - TimePrev + TimeAct) > 1000 )  ) {
    Pulse_1s = true;
    TimePrev = TimeAct;
  }
}

void Task_Schedule()      // Runs tasks at scheduled time
{
  if (Pulse_1s == true)
  {
    Task_Timer_1++;
  }
  if (Task_Timer_1 == 5)  // Runs tasks every 5 seconds
  {
  Analog_Read();
  Display();
  Task_Timer_1 = 0;
  }
}

void Analog_Read()
{

// Conversion of analog input A0
analogVal_0 = analogRead(analogPin_0);  // read the input pin
float voltage_0 = analogVal_0 * (5.0 / 1023.0);
float temp_0 = (((voltage_0 * 100) / vt_factor) + offset);
Serial.println(analogVal_0);
Temperatur_0 = temp_0;
if (Temperatur_0 > Temp_max_0)
{
  Temp_max_0 = Temperatur_0;
}

// Conversion of analog input A1
analogVal_1 = analogRead(analogPin_1);  // read the input pin
float voltage_1 = analogVal_1 * (5.0 / 1023.0);
float temp_1 = (((voltage_1 * 100) / vt_factor) + offset);
Serial.println(analogVal_1);
Temperatur_1 = temp_1;
if (Temperatur_1 > Temp_max_1)
{
  Temp_max_1 = Temperatur_1;
}

// Conversion of analog input A2
analogVal_2 = analogRead(analogPin_2);  // read the input pin
float voltage_2 = analogVal_2 * (5.0 / 1023.0);
float temp_2 = (((voltage_2 * 100) / vt_factor) + offset);
Serial.println(analogVal_2);
Temperatur_2 = temp_2;
if (Temperatur_2 > Temp_max_2)
{
  Temp_max_2 = Temperatur_2;
}

// Conversion of analog input A3
analogVal_3 = analogRead(analogPin_3);  // read the input pin
float voltage_3 = analogVal_3 * (5.0 / 1023.0);
float temp_3 = (((voltage_3 * 100) / vt_factor) + offset);
Serial.println(analogVal_3);
Temperatur_3 = temp_3;
if (Temperatur_3 > Temp_max_3)
{
  Temp_max_3 = Temperatur_3;
}

}

void Display()           // Controlls display readings
{
lcd.clear();

// First line
lcd.setCursor(0,0);
lcd.print("L1");
lcd.setCursor(3,0);
lcd.print("Act:");
lcd.setCursor(7,0); 
lcd.print(Temperatur_0);
lcd.setCursor(11,0);
lcd.print("Max:");
lcd.setCursor(15,0); 
lcd.print(Temp_max_0);
lcd.setCursor(18,0);
lcd.write(0xDF);
lcd.setCursor(19,0);
lcd.print("C");

// Second line
lcd.setCursor(0,1);
lcd.print("L2");
lcd.setCursor(3,1);
lcd.print("Act:");
lcd.setCursor(7,1); 
lcd.print(Temperatur_1);
lcd.setCursor(11,1);
lcd.print("Max:");
lcd.setCursor(15,1); 
lcd.print(Temp_max_1);
lcd.setCursor(18,1);
lcd.write(0xDF);
lcd.setCursor(19,1);
lcd.print("C");

//Third line
lcd.setCursor(0,2);
lcd.print("L3");
lcd.setCursor(3,2);
lcd.print("Act:");
lcd.setCursor(7,2); 
lcd.print(Temperatur_2);
lcd.setCursor(11,2);
lcd.print("Max:");
lcd.setCursor(15,2); 
lcd.print(Temp_max_2);
lcd.setCursor(18,2);
lcd.write(0xDF);
lcd.setCursor(19,2);
lcd.print("C");

// Fourth line
lcd.setCursor(0,3);
lcd.print("L4");
lcd.setCursor(3,3);
lcd.print("Act:");
lcd.setCursor(7,3); 
lcd.print(Temperatur_3);
lcd.setCursor(11,3);
lcd.print("Max:");
lcd.setCursor(15,3); 
lcd.print(Temp_max_3);
lcd.setCursor(18,3);
lcd.write(0xDF);
lcd.setCursor(19,3);
lcd.print("C");

}


// ------------------------------------------------------
// MAIN LOOP
// ------------------------------------------------------


void loop()
{
Pulse();                  // Generate pulse for 1s
Task_Schedule();          // Task Schedule

// Reset Max Values

if (digitalRead(Reset_BUTTON) == LOW) { 
  Reset = HIGH;
}
  
if (digitalRead(Reset_BUTTON) == HIGH && Reset == true) {  
    Temp_max_0 = 0;
    Temp_max_1 = 0;
    Temp_max_2 = 0;
    Temp_max_3 = 0;
    Reset  = false;                    
}
}