//UV - Sensor
const int trigPin = 12;
const int echoPin = 14;

//define sound velocity in cm/uS
#define SOUND_VELOCITY 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

//defining DHT22 sensor
#include <WiFi.h>//library for wifi
#include <PubSubClient.h>//library for MQtt 
#include "DHT.h"// Library for dht11
#define DHTPIN 15     // what pin we're connected to
#define DHTTYPE DHT22   // define type of sensor DHT 11

//Fire - Sensor
int Buzzer = 32;       
//int Fire_analog = 4;    
int Fire_digital = 2;  
//int Buzzer = 32;        // used for ESP32
//int Fire_analog = 4;    // used for ESP32
//int Fire_digital = 2;   // used for ESP32
// These constants should match the photoresistor's "gamma" and "rl10" attributes
#define LIGHT_SENSOR_PIN 34


DHT dht (DHTPIN, DHTTYPE);// creating the instance by passing pin and typr of dht connected

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength); 

//-------credentials of IBM Accounts------

#define ORG "l1a82f"//IBM ORGANITION ID
#define DEVICE_TYPE "cibie"//Device type mentioned in ibm watson IOT Platform
#define DEVICE_ID "cibie123"//Device ID mentioned in ibm watson IOT Platform
#define TOKEN "12345678"     //Token
String data3;
float h, t;


//-------- Customise the above values --------
char server[] = ORG ".messaging.internetofthings.ibmcloud.com";// Server Name
char publishTopic[] = "iot-2/evt/Data/fmt/json";// topic name and type of event perform and format in which data to be send
char subscribetopic[] = "iot-2/cmd/command/fmt/String";// cmd  REPRESENT command type AND COMMAND IS TEST OF FORMAT STRING
char authMethod[] = "use-token-auth";// authentication method
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID;//client id


//-----------------------------------------
WiFiClient wifiClient; // creating the instance for wificlient
PubSubClient client(server, 1883, callback ,wifiClient); //calling the predefined client id by passing parameter like server id,portand wificredential


void setup()// configureing the ESP32 
{
  //DHT22 - Sensor
  Serial.begin(115200);
  dht.begin();
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();

//UV-Sensor
  Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();

 // Fire-sensor
 Serial.begin(115200);
  pinMode(Buzzer, OUTPUT);      
  pinMode(Fire_digital, INPUT);
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();

}

void loop()// Recursive Function
{

//DHT22 - Sensor
  h = dht.readHumidity();
  t = dht.readTemperature();
  Serial.print("temp:");
  Serial.println(t);
  Serial.print("Humid:");
  Serial.println(h);

  PublishData(t, h);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }


  // UV - Sensor
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance
  distanceCm = duration * SOUND_VELOCITY/2;
  
  // Convert to inches
  distanceInch = distanceCm * CM_TO_INCH;
  
  // Prints the distance on the Serial Monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  if(distanceCm<30)
  {
    Serial.println("Animal Detected");
    digitalWrite (Buzzer, HIGH) ; //send tone
    delay(1000);
    digitalWrite (Buzzer, LOW) ; 
  }
  else{
    Serial.println("No Animal Detected");
  }
   PublishData(duration, distanceCm);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
  
/*
  //Fire-Sensor
  float firesensorAnalog = analogRead(lux);
  int firesensorDigital = digitalRead(Fire_digital);

  Serial.print("Fire Sensor: ");
  Serial.print(firesensorAnalog);
  Serial.print("\t");
  Serial.print("Fire Class: ");
  Serial.print(firesensorDigital);
  Serial.print("\t");
  Serial.print("\t");
  
  if (firesensorAnalog >500) {
    Serial.println("Fire");
    digitalWrite (Buzzer, HIGH) ; //send tone
    delay(1000);
    digitalWrite (Buzzer, LOW) ;  //no tone
  }
  else {
    Serial.println("No Fire");
  }


  PublishData(firesensorAnalog, firesensorDigital);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
  */

  // reads the input on analog pin (value between 0 and 4095)
  int analogValue = analogRead(LIGHT_SENSOR_PIN);
int firesensorDigital = digitalRead(Fire_digital);
  //Serial.print("Analog Value = ");
  //Serial.print(analogValue);   // the raw analog reading

  // We'll have a few threshholds, qualitatively determined
  if (analogValue < 800) {
    digitalWrite (Buzzer, LOW) ;
    Serial.println(" SAFE!, No fire detected");
  }
   else if (analogValue < 3200) {
    digitalWrite (Buzzer, HIGH) ;
     delay(1000);
    digitalWrite (Buzzer, LOW) ;
    Serial.println("Warning! Fire detected in your Crop field");
  } 
    
   else {
    digitalWrite (Buzzer, HIGH) ;
     delay(1000);
    digitalWrite (Buzzer, LOW) ;
    Serial.println("Critcal!!!, You are in Danger! Most of the Crops are roasted by fire");
  }


  
  PublishData(analogValue, firesensorDigital);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
}



/*.....................................retrieving to Cloud...............................*/

void PublishData(float temp, float humid) {
  mqttconnect();//function call for connecting to ibm
  /*
     creating the String in in form JSon to update the data to ibm cloud
  */
  String payload = "{\"temp\":";
  payload += temp;
  payload += "," "\"Humid\":";
  payload += humid;
  payload += "}";

  
  Serial.print("Sending payload: ");
  Serial.println(payload);

  
  if (client.publish(publishTopic, (char*) payload.c_str())) {
    Serial.println("Publish ok");// if it sucessfully upload data on the cloud then it will print publish ok in Serial monitor or else it will print publish failed
  } else {
    Serial.println("Publish failed");
  }
  
}


void mqttconnect() {
  if (!client.connected()) {
    Serial.print("Reconnecting client to ");
    Serial.println(server);
    while (!!!client.connect(clientId, authMethod, token)) {
      Serial.print(".");
      delay(500);
    }
      
     initManagedDevice();
     Serial.println();
  }
}
void wificonnect() //function defination for wificonnect
{
  Serial.println();
  Serial.print("Connecting to ");

  WiFi.begin("Wokwi-GUEST", "", 6);//passing the wifi credentials to establish the connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void initManagedDevice() {
  if (client.subscribe(subscribetopic)) {
    Serial.println((subscribetopic));
    Serial.println("subscribe to cmd OK");
  } else {
    Serial.println("subscribe to cmd FAILED");
  }
}

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength) 
{
  
  Serial.print("callback invoked for topic: ");
  Serial.println(subscribetopic);
  for (int i = 0; i < payloadLength; i++) {
    //Serial.print((char)payload[i]);
    data3 += (char)payload[i];
  } 
   
}