Forest Fire Monitoring & Detection System (with SMS Alerts)

########( PART-1  )######  Receiver Side Arduino CODE ##########################
// Include RadioHead Amplitude Shift Keying Library
#include <SoftwareSerial.h>
#include <RH_ASK.h>
// Include dependant SPI Library 
#include <SPI.h> 

#include <DHT.h>

SoftwareSerial mySerial(4, 3);
 
//Constants
#define DHTPIN 2     // what pin we're connected to
#define DHTTYPE DHT11   // DHT11

int smokeA0 = A5;
// Your threshold value
int sensorThres = 400; 
// Define Variables

DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor for normal 16mhz Arduino

//Variables
float hum;  //Stores humidity value
float temp; //Stores temperature value
 
// Define output strings
 
String str_humid;
String str_temp;
String str_smk;
String str_out;
 
// Create Amplitude Shift Keying Object
RH_ASK rf_driver;


void setup()
{
    pinMode(smokeA0, INPUT);
    dht.begin();  
    // Initialize ASK Object
    rf_driver.init();
    // Setup Serial Monitor
    Serial.begin(9600);
    mySerial.begin(115200);
}
 
void loop()
{   
    delay(2000);
    hum = dht.readHumidity();
    temp= dht.readTemperature();
    Serial.print("Reciever Humidity = ");
    Serial.print(hum);
    Serial.print('\n');
    Serial.print("Reciever Temperature = ");
    Serial.println(temp);

    int analogSensor = analogRead(smokeA0);
    String smk;
    // Checks if it has reached the threshold value
    if (analogSensor > sensorThres)
    {
      Serial.print("Smoke at Reciever");
      Serial.print('\n');
      smk = "Smoke";
    }
    else
    {
      Serial.print("Clean at Reciever");
      Serial.print('\n');
      smk = "Clean";
    }
  
    // Set buffer to size of expected message
    uint8_t buf[20];
    uint8_t buflen = sizeof(buf);
    // Check if received packet is correct size
   if (rf_driver.recv(buf, &buflen))
   {
     str_out = String((char*)buf);
     for (int i = 0; i < str_out.length(); i++)
     {
      if (str_out.substring(i, i+1) == ",")
        {
        str_humid = str_out.substring(0, i);
        str_temp = str_out.substring(i+1, i+6);
        str_smk = str_out.substring(i+7,i+12 );
        break;
        }
      }
    }
      
      // Print values to Serial Monitor
      Serial.print("Humidity: ");
      Serial.print(str_humid);
      Serial.print("  - Temperature: ");
      Serial.println(str_temp);
      Serial.print("  - Air Quality: ");
      Serial.println(str_smk);


      if( hum >= 60 && temp >= 25 )
      {
      Serial.print("Fire Detected at Reciever ");
      mySerial.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
      delay(1000);  // Delay of 1000 milli seconds or 1 second
      mySerial.println("AT+CMGS=\"+918744984131\"\r"); // Replace x with mobile number
      delay(1000);
      mySerial.println("    FIRE ALERT  !! ");
      Serial.println('\n');
      mySerial.println("Fire at Reciever Node ");
      Serial.println('\n');
      mySerial.println("Temperature : " + String(temp));
      Serial.print('\n');
      mySerial.println("Humidity : " + String(hum));
      Serial.print('\n');
      mySerial.println("Air Quality : " + smk);
      delay(100);
      mySerial.println((char)26);// ASCII code of CTRL+Z
      delay(1000); 
      }
      if( str_humid.toInt() >= 60 && str_temp.toInt() >= 25 )
      {
      Serial.print("Fire Detected at Transmitter ");
      mySerial.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
      delay(1000);
      mySerial.println("AT+CMGS=\"+918744984131\"\r"); // Replace x with mobile number
      delay(1000);
      mySerial.println("    FIRE ALERT !! ");
      Serial.println('\n');
      mySerial.println("Fire at Transmitter Node ");
      Serial.println('\n');
      mySerial.println("Temperature : " + str_temp);
      Serial.print('\n');
      mySerial.println("Humidity : " + str_humid);
      Serial.print('\n');
      mySerial.println("Air Quality : " + String(str_smk));
      delay(100);
      mySerial.println((char)26);// ASCII code of CTRL+Z
      delay(1000); 
      }
      
}

#######(  PART-2   )############  Transmitter Side Arduino Code ############
############################################################################

#include <RH_ASK.h> 
#include <SPI.h> 
#include <DHT.h>

//Constants
#define DHTPIN 2     // what pin we're connected to
#define DHTTYPE DHT11   // DHT11

DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor for normal 16mhz Arduino

int smokeA0 = A5;
// Your threshold value
int sensorThres = 400; 
// Define Variables
 
float hum;    // Stores humidity value in percent
float temp;   // Stores temperature value in Celcius
float smk;
 
// Define output strings
 
String str_humid;
String str_temp;
String str_smk;
String str_out;


 
// Create Amplitude Shift Keying Object
RH_ASK rf_driver;
 
// Initialize DHT sensor for normal 16mhz Arduino
 
void setup() {
  dht.begin(); 
  pinMode(smokeA0, INPUT);
  // Initialize ASK Object
  rf_driver.init();
 
}
 
void loop()
{
 
    delay(2000);  // Delay so DHT-22 sensor can stabalize
   
    hum = dht.readHumidity();  // Get Humidity value
    temp= dht.readTemperature();  // Get Temperature value
    
    // Convert Humidity to string
    str_humid = String(hum);
    Serial.print(hum);
    // Convert Temperature to string
    str_temp = String(temp);
    Serial.print(temp);
    int analogSensor = analogRead(smokeA0);
    // Checks if it has reached the threshold value
    if (analogSensor > sensorThres)
    {
      str_smk = "1";
    }
    else
    {
      str_smk = "0";
    }
 
    // Combine Humidity and Temperature
    if(str_smk == "1")
    {
    str_out = str_humid + "," + str_temp + "," + "Smoke";
    }
    if(str_smk == "0")
    {
    str_out = str_humid + "," + str_temp+ "," + "Clean";  
    }
    // Compose output character
    const char *msg = str_out.c_str();
    
    rf_driver.send((uint8_t *)msg, strlen(msg));
    rf_driver.waitPacketSent();
  
}