Complete_Project_with_Blynk.ino

#include <Blynk.h>


#define BLYNK_PRINT Serial
#include <SoftwareSerial.h>         // including the library for the software serial
#define DEBUG true
SoftwareSerial esp8266(2,3);      /* This will make the pin 10 of arduino as RX pin and
pin 11 of arduino as the TX pin Which means that you have to connect the TX from the esp8266
to the pin 10 of arduino and the Rx from the esp to the pin 11 of the arduino*/
#include <BlynkSimpleStream.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "7046c36fe2544f37b3635e82ed428388";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "NAVEEN";
char pass[] = "1234567890";                                   
const int trigPin = 8;            // Making the arduino's pin 8 as the trig pin of ultrasonic sensor
const int echoPin = 9;            // Making the arduino's pin 9 as the echo pin of the ultrasonic sensor
// defining two variable for measuring the distance
long duration;
int distance;
BLYNK_WRITE(V5)
{
  int pinValue=param.asInt();
}

void setup()
{
  Serial.begin(9600);         // Setting the baudrate at 9600
  esp8266.begin(9600); // Set the baudrate according to you esp's baudrate. your esp's baudrate might be different from mine
  Blynk.begin(Serial,auth);
  pinMode(trigPin, OUTPUT);   // Setting the trigPin as Output pin
  pinMode(echoPin, INPUT);    // Setting the echoPin as Input pin
  
  sendData("AT+RST\r\n",2000,DEBUG);            // command to reset the module
  sendData("AT+CWMODE=2\r\n",1000,DEBUG);       // This will configure the mode as access point
  sendData("AT+CIFSR\r\n",1000,DEBUG);          // This command will get the ip address
  sendData("AT+CIPMUX=1\r\n",1000,DEBUG);       // This will configure the esp for multiple connections
  sendData("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // This command will turn on the server on port 80
}

void loop()
{
digitalWrite(trigPin, LOW);   // Making the trigpin as low
delayMicroseconds(2);         // delay of 2us
digitalWrite(trigPin, HIGH); // making the trigpin high for 10us to send the signal 
delayMicroseconds(10);
digitalWrite(trigPin, LOW);   
duration = pulseIn(echoPin, HIGH);  // reading the echopin which will tell us that how much time the signal takes to come back 

distance= duration*0.034/2;       // Calculating the distance and storing in the distance variable
  Blynk.virtualWrite(V5,distance);
  delay(200);
  Blynk.run();
  if(esp8266.available())         // This command will that check if the esp is sending a message 
  {    
    if(esp8266.find("+IPD,"))
    {
     delay(1000);
     int connectionId = esp8266.read()-48; /* We are subtracting 48 from the output because the read() function returns 
                                            the ASCII decimal value and the first decimal number which is 0 starts at 48*/
     String webpage = "<h1>IOT Garbage Monitoring System</h1>";
       webpage+= "<p><h2>";   
       if (distance<5)
       {
        webpage+= " Trash can is Full";
        }
        else{
          webpage+= " Trash can is Empty";
          }
       webpage+= "</h2></p></body>";  
     String cipSend = "AT+CIPSEND=";
     cipSend+= connectionId;
     cipSend+= ",";
     cipSend+=webpage.length();
     cipSend+="\r\n";

     sendData(cipSend,1000,DEBUG);
     sendData(webpage,1000,DEBUG);    
     String closeCommand = "AT+CIPCLOSE="; 
     closeCommand+=connectionId; 
     closeCommand+="\r\n";
     sendData(closeCommand,3000,DEBUG);
    }
  }
}
 
String sendData(String command, const int timeout, boolean debug)
{
    String response = "";   
    esp8266.print(command); 
    long int time = millis();
    while( (time+timeout) > millis())
    {
      while(esp8266.available())
      {
        char c = esp8266.read(); 
        response+=c;
      }  
    }
    if(debug)
    {
      Serial.print(response);
    }
    return response;
}