//#define BLYNK_TEMPLATE_ID "TMPL3cc3KTGWg"

//#define BLYNK_TEMPLATE_NAME "temp"

//#define BLYNK_AUTH_TOKEN "bvQETxv2CsbqrtBthaQS1gpyD3fyYB0i"

#include <OneWire.h>
#include <DallasTemperature.h>
//#include <WiFi.h>
//#include <WiFiClient.h>
//#include <BlynkSimpleEsp32.h>
#include <DNSServer.h>
//#include <WebServer.h>
//#include <WiFiManager.h> 
#include <LiquidCrystal_I2C.h>

//WiFiServer server(80); // Set web server port number to 80
//String header;// Variable to store the HTTP request

#define ONE_WIRE_BUS 13 // Data wire is connected to GPIO 13
//#define BLYNK_PRINT Serial

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Addresses of 3 DS18B20s
uint8_t sensor01[8] = { 0x28, 0xB2, 0x8F, 0x45, 0xD4, 0xD7, 0x53, 0x3A };
uint8_t sensor02[8] = { 0x28, 0x35, 0xD9, 0x45, 0xD4, 0x21, 0x37, 0x6B };
uint8_t sensor03[8] = { 0x28, 0x63, 0xFD, 0x45, 0xD4, 0x7B, 0x0C, 0x1E };
float temperature01;
float temperature02;  // Variables for storing temperatures
float temperature03;

const int TEMP_Threshold_Upper=35; // Upper threshold temperture for alarm
const int TEMP_Threshold_Lower=-127;
const int RELAY_Alarm=12; //pin for alarm relay

LiquidCrystal_I2C lcd(0x27, 20, 4);  //LCD Address and Size

//char auth[] = BLYNK_AUTH_TOKEN;
//BlynkTimer timer;

const int PIN_AP = 0; // to enter wifi manager

DeviceAddress Thermometer;
int deviceCount=0;

//unsigned long previousMillis = 0; //for wifi reconnect
///]unsigned long interval = 30000;

void setup(void) 
{
   Serial.begin(9600); // Start the serial communication
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("WELCOME ");
delay(2000);
lcd.clear();
lcd.print("IOT Temperature Monitoring System");
delay(3000);
lcd.clear();

pinMode(RELAY_Alarm, OUTPUT); //initialize digial pin as an output
pinMode(PIN_AP, INPUT);       //initialize digital pin as input
        
// WiFiManager
  //WiFiManager wifiManager;  
  //wifiManager.autoConnect("AutoConnectAP");
  Serial.println("Connected.");
  lcd.println("Connected.");
    // Connect to Blynk
  //Blynk.config(auth);
//Blynk.connect();
  //while (!Blynk.connected()) 
//{
  //  Serial.println("Connecting to Blynk...");
    //lcd.println("Connecting to Blynk...");
    //delay(2000);
  //}
  Serial.println("Connected to Blynk");
  lcd.println("Connected to Blynk");

sensors.begin();
  Serial.println("Locating devices...");
  lcd.println("Locating devices...");
  Serial.print("Found ");
  lcd.print("Found ");
  deviceCount = sensors.getDeviceCount();
  Serial.print(deviceCount, DEC);
  lcd.print(deviceCount, DEC);
  Serial.println(" devices.");
  lcd.println(" devices.");
  Serial.println("");
  lcd.println("");
  Serial.println("Printing addresses...");
  lcd.println("Printing addresses...");
  for (int i=0; i < deviceCount; i++)
  {
    Serial.print("Sensor ");
    lcd.print("Sensor ");
    Serial.print(i+1);
    lcd.print(i+1);
    Serial.print(" : ");
    lcd.print(" : ");
    sensors.getAddress(Thermometer, i);
    printAddress(Thermometer);

  }

  sensors.setResolution(sensor01, 10);     //set  resolution
  
  sensors.setResolution(sensor02, 10);     //set  resolution
  
  sensors.setResolution(sensor02, 10);     //set  resolution

}
  


void loop()

{sendSensor01();  // Temperature sensor read interval. 1000 (ms) = 1 seconds.
sendSensor02();  // Temperature sensor read interval. 1000 (ms) = 1 seconds.
  sendSensor03();  // Temperature sensor read interval. 1000 (ms) = 1 seconds.
}
  //wifi reconnecting
  //unsigned long currentMillis = millis();
  // if WiFi is down, try reconnecting every CHECK_WIFI_TIME seconds
  //if ((WiFi.status() != WL_CONNECTED) && (currentMillis - previousMillis >=interval)) 
//  {
    //Serial.print(millis());
    //lcd.print(millis());
    //Serial.println("Reconnecting to WiFi...");
    //lcd.println("Reconnecting to WiFi...");
      // WiFi.reconnect();
    //previousMillis = currentMillis;
  //}

//WiFiManager WifiManager;    
//if boot button was pressed
  // if ( digitalRead(PIN_AP) == LOW ) 
   //{
     // Serial.println("reset"); // try to open the portal
      //if(!WifiManager.startConfigPortal("AutoConnectAP", "") )
      //{
        //Serial.println("Failed to connect");
        //delay(2000);
        //ESP.restart();
        //delay(1000);
      //}
      //Serial.println("connected!!!"); 
   //}

//{
  //  Blynk.run();
    //timer.run();
//}
  
//}



void printAddress(DeviceAddress deviceAddress)
{ 
  for (uint8_t i = 0; i < 8; i++)
  {
    Serial.print("0x");
    if (deviceAddress[i] < 0x10) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
    if (i < 7) Serial.print(", ");
  }
  Serial.println("");
}


void sendSensor01()
{lcd.clear();
  sensors.requestTemperatures();                  // Polls the sensors.
  temperature01 = sensors.getTempC(sensor01);   // Stores temperature. Change to getTempCByIndex(0) for celcius.
  //Blynk.virtualWrite(0, temperature01);  // Send temperature to Blynk app virtual pin 1.
  Serial.print("T1: ");   
   lcd.setCursor(0,0);
  lcd.print("T1: ");
  Serial.print(temperature01); 
  lcd.print(temperature01); 
  Serial.println(" Deg C"); 
  lcd.print((char)223);
  lcd.print("C"); 
  ;
  delay(2000);
   if (temperature01 > TEMP_Threshold_Upper)
  {
    Serial.println("Warning! High Temp T1");
    lcd.println("T1 High Temp");
    delay(2000);
    digitalWrite(RELAY_Alarm, HIGH);
  
  delay(2000);}
   else (temperature01 = TEMP_Threshold_Lower);
   {
    digitalWrite(RELAY_Alarm, HIGH);
    Serial.println("T1 Sensor Fault");
    lcd.setCursor(012);
    lcd.println(" T1 Sen/Flt");
   
  delay(2000);
   }
}

void sendSensor02()
{
  sensors.requestTemperatures();                  // Polls the sensors.
  temperature02 = sensors.getTempC(sensor02);   // Stores temperature. Change to getTempCByIndex(0) for celcius.
  //Blynk.virtualWrite(1, temperature02);         // Send temperature to Blynk app virtual pin 1.
  Serial.print("T2: ");   
   lcd.setCursor(2,0);
  lcd.print("T2: ");
  Serial.print(temperature02); 
  
  lcd.print(temperature02); 
  Serial.println(" Deg C"); 
  lcd.print((char)223);
  lcd.println("C"); 
  if(temperature03> TEMP_Threshold_Upper)
  {
    Serial.println("Warning! High Temp T2");
    lcd.println("T2 High Temp");
    delay(2000);
    digitalWrite(RELAY_Alarm, HIGH);
  
  delay(2000);}
   else if(temperature02 = TEMP_Threshold_Lower);
   {
    digitalWrite(RELAY_Alarm, HIGH);
    Serial.println("T2 Sensor Fault");
 lcd.setCursor(2,12);
    lcd.println("T2 Sen/Flt");

  delay(2000);}
}




void sendSensor03()
{
  sensors.requestTemperatures();                  // Polls the sensors.
  temperature03 = sensors.getTempC(sensor03);   // Stores temperature. Change to getTempCByIndex(0) for celcius.
  //Blynk.virtualWrite(2, temperature03);         // Send temperature to Blynk app virtual pin 1.
  Serial.print("T3: ");
   lcd.setCursor(3,0);   
  lcd.print("T3: ");
  Serial.print(temperature03); 
  lcd.print(temperature03); 
  Serial.println(" Deg C"); 
  lcd.print((char)223);
  lcd.println("C"); 
  if(temperature03> TEMP_Threshold_Upper)
  {
    Serial.println("Warning! High Temp T3");
    lcd.println("T3 High Temp");
    delay(2000);
digitalWrite(RELAY_Alarm, HIGH);
  
  delay(2000);}
   else if(temperature03 = TEMP_Threshold_Lower);
   {
    digitalWrite(RELAY_Alarm, HIGH);
    Serial.println("T3 Sensor Fault");
 lcd.setCursor(3,12);
    lcd.println("T3 Sensor Fault");

  delay(2000);   }
}