#include <SoftwareSerial.h>
#include <LiquidCrystal_I2C.h>

//Create software serial object to communicate with SIM800L
SoftwareSerial mySerial(2, 3);       //SIM800L Tx & Rx is connected to Arduino #3 & #2
LiquidCrystal_I2C lcd(0x27, 16, 2);  // set the LCD address to 0x3F for a 16 chars and 2 line display

void setup() {
  //Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
  Serial.begin(115200);

  //Begin serial communication with Arduino and SIM800L
  mySerial.begin(9600);
  pinMode(4, INPUT);  // Fire sensor input
  pinMode(5, INPUT);  // Smoke sensor inpput
  pinMode(6, OUTPUT);
  delay(1000);
  Serial.println("Initializing...");
  lcd.init();
  lcd.clear();
  lcd.backlight();  // Make sure backlight is on

  // Print a message on both lines of the LCD.
  lcd.setCursor(0, 0);  //Set cursor to character 2 on line 0
  lcd.print("System Starting");
  lcd.setCursor(0, 1);  //Move cursor to character 2 on line 1
  lcd.print("  Please Wait");
  delay(3000);

  mySerial.println("AT");  //Once the handshake test is successful, it will back to OK
  updateSerial();
  delay(1000);

  mySerial.println("AT+CMGDA=\"DEL ALL\"");
  delay(2000);

  mySerial.println("AT+CMGD=1,4");
  //Serial.println("All sms deleted");
  delay(4000);
  mySerial.println("AT+CMGF=1");  // Configuring TEXT mode
  updateSerial();
  delay(1000);
  mySerial.println("AT+CMGS=\"+918770487887\"");
  updateSerial();
  delay(1000);
  mySerial.println("Forest Fire safety System");  //text content
  mySerial.println("System Ready for use");       //text content
  updateSerial();
  delay(1000);
  mySerial.write(26);

  lcd.clear();
  lcd.setCursor(0, 0);  //Move cursor to character 2 on line 1
  lcd.print("   SMS Send ");
  lcd.setCursor(0, 1);  //Move cursor to character 2 on line 1
  lcd.print(" Please Check ");
  delay(3000);
  digitalWrite(6, LOW);
}

void loop() {

  int fire = digitalRead(4);
  int smoke = digitalRead(5);

  Serial.println(fire);
  Serial.println(smoke);
  Serial.println("--------------------------");


  if (fire == 0) {

    Serial.println("Fire detection");
    digitalWrite(6, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);  //Move cursor to character 2 on line 1
    lcd.print("   Alert....  ");
    lcd.setCursor(0, 1);  //Move cursor to character 2 on line 1
    lcd.print(" Fire Detected");
    delay(2000);

    mySerial.println("AT+CMGF=1");  // Configuring TEXT mode
    updateSerial();
    delay(1000);
    mySerial.println("AT+CMGS=\"+918770487887\"");
    updateSerial();
    delay(1000);
    mySerial.println("Forest Fire safety System");  //text content
    mySerial.println("Alert...");                   //text content
    mySerial.println("Fire Detected");              //text content
    updateSerial();
    delay(1000);
    mySerial.write(26);
    delay(1000);
    digitalWrite(6, LOW);
  }

  if (smoke == 0) {
    Serial.println("smoke detection");
    digitalWrite(6, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);  //Move cursor to character 2 on line 1
    lcd.print("   Alert....  ");
    lcd.setCursor(0, 1);  //Move cursor to character 2 on line 1
    lcd.print(" Smoke Detected");
    delay(2000);

    mySerial.println("AT+CMGF=1");  // Configuring TEXT mode
    updateSerial();
    delay(1000);
    mySerial.println("AT+CMGS=\"+918770487887\"");  //change ZZ with country code and xxxxxxxxxxx with phone number to sms
    //mySerial.println("AT+CMGS=\"+918770487887\"");//change ZZ with country code and xxxxxxxxxxx with phone number to sms
    updateSerial();
    delay(1000);
    mySerial.println("Forest Fire safety System");  //text content
    mySerial.println("Alert...");                   //text content
    mySerial.println("Smoke Detected");             //text content
    updateSerial();
    delay(1000);
    mySerial.write(26);
    delay(1000);
    digitalWrite(6, LOW);
  }

  else {
    Serial.println(" Nothing .......");

    lcd.clear();
    lcd.setCursor(0, 0);  //Move cursor to character 2 on line 1
    lcd.print("  No Fire and  ");
    lcd.setCursor(0, 1);  //Move cursor to character 2 on line 1
    lcd.print(" Smoke Detected");
    delay(2000);
  }
}

void updateSerial() {
  delay(500);
  while (Serial.available()) {
    mySerial.write(Serial.read());  //Forward what Serial received to Software Serial Port
  }
  while (mySerial.available()) {
    Serial.write(mySerial.read());  //Forward what Software Serial received to Serial Port
  }
}