ESP8266 don't show results in browser

Projects General Guidance
1 
#include "MQ135.h"
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial esp8266(0,1); // This makes pin 9 of Arduino as RX pin and pin 10 of Arduino as the TX pin
const int sensorPin= A0;
int air_quality;
#include <LiquidCrystal.h> 
LiquidCrystal lcd(12,11, 5, 4, 3, 2);

void setup() {
pinMode(8, OUTPUT);
lcd.begin(16,2);
lcd.setCursor (0,0);
lcd.print ("AIR POLLUTION MONITORING SYSTEM ");
lcd.setCursor (0,1);

delay(5000);

pinMode(sensorPin, INPUT);        //Gas sensor will be an input to the arduino
lcd.clear();
}

void loop() {

MQ135 gasSensor = MQ135(A0);
float air_quality = gasSensor.getPPM();

if(esp8266.available()) // check if the esp is sending a message 
  {
    if(esp8266.find((char*)"+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 Air Pollution Monitoring System</h1>";
       webpage += "<p><h2>";   
       webpage+= " Air Quality is ";
       webpage+= air_quality;
       webpage+=" PPM";
       webpage += "<p>";
     if (air_quality<=1000)
{
  webpage+= "Fresh Air";
}
else if(air_quality<=2000 && air_quality>=1000)
{
  webpage+= "Poor Air";
}

else if (air_quality>=2000 )
{
webpage+= "Danger! Move to Fresh Air";
}

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);
     
     cipSend = "AT+CIPSEND=";
     cipSend += connectionId;
     cipSend += ",";
     cipSend +=webpage.length();
     cipSend +="\r\n";
     
     String closeCommand = "AT+CIPCLOSE="; 
     closeCommand+=connectionId; // append connection id
     closeCommand+="\r\n";
     
     sendData(closeCommand,3000,DEBUG);
    }
  }

lcd.setCursor (0, 0);
lcd.print ("Air Quality is ");
lcd.print (air_quality);
lcd.print (" PPM ");
lcd.setCursor (0,1);
if (air_quality<=1000)
{
lcd.print("Fresh Air");
digitalWrite(8, LOW);
}
else if( air_quality>=1000 && air_quality<=2000 )
{
lcd.print("Poor Air, Open Windows");
digitalWrite(8, HIGH );
}
else if (air_quality>=2000 )
{
lcd.print("Danger! Move to Fresh Air");
digitalWrite(8, HIGH);   // turn the LED on
}
lcd.scrollDisplayLeft();
delay(1000);
}
String sendData(String command, const int timeout, boolean debug)
{
    String response = ""; 
    esp8266.print(command); // send the read character to the esp8266
    long int time = millis();
    while( (time+timeout) > millis())
    {
      while(esp8266.available())
      {
        // The esp has data so display its output to the serial window 
        char c = esp8266.read(); // read the next character.
        response+=c;
      }  
    }
    if(debug)
    {
      Serial.print(response);
    }
    return response;
}

here is the code and circuit diagram is also attached .my project show result on LCD but not on web browser .

Iot-air-quality-monitoring-system-using-arduino-circuit (2).jpg
Iot-air-quality-monitoring-system-using-arduino-circuit (2).jpg1229×853 146 KB

2

This not good on a Uno or similar:

#include <SoftwareSerial.h>
. . .
SoftwareSerial esp8266(0,1); // This makes pin 9 of Arduino as RX pin and pin 10 of Arduino as the TX pin

Pins 0 & 1 should not be used for software serial because these are the hardware serial pins.
Use other pins, then you can use the serial console for debug statements like Serial.println( webpage ) to see how far through the logic your code is progressing.

3

i have changed pin and set it as 9 and 10 but still it does not show any output on browser.

4

ftech:
i have changed pin and set it as 9 and 10 but still it does not show any output on browser.

Post a link to the tutorial you are following.
I'd have expected to see an esp8266.begin() statement.

As I said before, you can now start embedding debug statements in your code, and look at the output on the serial console: for example:

Serial.begin(9600) ;  // in setup()
. . .
. . . 
Serial.println( webpage ) ;
. . .
// etc. etc.
5

link that i followed:

6

Well,

appears to have a this statement:

esp8266.begin(115200);

which is missing from your code. There may, of course, be other problems.

7 
#include "MQ135.h"
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial esp8266(9,10); // This makes pin 9 of Arduino as RX pin and pin 10 of Arduino as the TX pin
const int sensorPin= 0;
int air_quality;
#include <LiquidCrystal.h> 
LiquidCrystal lcd(12,11, 5, 4, 3, 2);

void setup() {
pinMode(8, OUTPUT);
lcd.begin(16,2);
lcd.setCursor (0,0);
lcd.print ("circuitdigest ");
lcd.setCursor (0,1);
lcd.print ("Sensor Warming ");
delay(1000);
Serial.begin(115200);
esp8266.begin(115200); // your esp's baud rate might be different
  sendData("AT+RST\r\n",2000,DEBUG); // reset module
  sendData("AT+CWMODE=2\r\n",1000,DEBUG); // configure as access point
  sendData("AT+CIFSR\r\n",1000,DEBUG); // get ip address
  sendData("AT+CIPMUair_quality=1\r\n",1000,DEBUG); // configure for multiple connections
  sendData("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // turn on server on port 80
pinMode(sensorPin, INPUT);        //Gas sensor will be an input to the arduino
lcd.clear();
}

void loop() {

MQ135 gasSensor = MQ135(A0);
float air_quality = gasSensor.getPPM();

if(esp8266.available()) // 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 Air Pollution Monitoring System</h1>";
       webpage += "<p><h2>";   
       webpage+= " Air Quality is ";
       webpage+= air_quality;
       webpage+=" PPM";
       webpage += "<p>";
     if (air_quality<=1000)
{
  webpage+= "Fresh Air";
}
else if(air_quality<=2000 && air_quality>=1000)
{
  webpage+= "Poor Air";
}

else if (air_quality>=2000 )
{
webpage+= "Danger! Move to Fresh Air";
}

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);
     
     cipSend = "AT+CIPSEND=";
     cipSend += connectionId;
     cipSend += ",";
     cipSend +=webpage.length();
     cipSend +="\r\n";
     
     String closeCommand = "AT+CIPCLOSE="; 
     closeCommand+=connectionId; // append connection id
     closeCommand+="\r\n";
     
     sendData(closeCommand,3000,DEBUG);
    }
  }

lcd.setCursor (0, 0);
lcd.print ("Air Quality is ");
lcd.print (air_quality);
lcd.print (" PPM ");
lcd.setCursor (0,1);
if (air_quality<=1000)
{
lcd.print("Fresh Air");
digitalWrite(8, LOW);
}
else if( air_quality>=1000 && air_quality<=2000 )
{
lcd.print("Poor Air, Open Windows");
digitalWrite(8, HIGH );
}
else if (air_quality>=2000 )
{
lcd.print("Danger! Move to Fresh Air");
digitalWrite(8, HIGH);   // turn the LED on
}
lcd.scrollDisplayLeft();
delay(1000);
}
String sendData(String command, const int timeout, boolean debug)
{
    String response = ""; 
    esp8266.print(command); // send the read character to the esp8266
    long int time = millis();
    while( (time+timeout) > millis())
    {
      while(esp8266.available())
      {
        // The esp has data so display its output to the serial window 
        char c = esp8266.read(); // read the next character.
        response+=c;
      }  
    }
    if(debug)
    {
      Serial.print(response);
    }
    return response;
}

firstly i have write this code(circuit digest's code) but its not working so i made changes which i have posted and still its not working

8 
#include "MQ135.h"
#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial esp8266(9,10); // This makes pin 9 of Arduino as RX pin and pin 10 of Arduino as the TX pin
const int sensorPin= 0;
int air_quality;
#include <LiquidCrystal.h> 
LiquidCrystal lcd(12,11, 5, 4, 3, 2);

void setup() {
pinMode(8, OUTPUT);
lcd.begin(16,2);
lcd.setCursor (0,0);
lcd.print ("circuitdigest ");
lcd.setCursor (0,1);
lcd.print ("Sensor Warming ");
delay(1000);
Serial.begin(115200);
esp8266.begin(115200); // your esp's baud rate might be different
  sendData("AT+RST\r\n",2000,DEBUG); // reset module
  sendData("AT+CWMODE=2\r\n",1000,DEBUG); // configure as access point
  sendData("AT+CIFSR\r\n",1000,DEBUG); // get ip address
  sendData("AT+CIPMUair_quality=1\r\n",1000,DEBUG); // configure for multiple connections
  sendData("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // turn on server on port 80
pinMode(sensorPin, INPUT);        //Gas sensor will be an input to the arduino
lcd.clear();
}

void loop() {

MQ135 gasSensor = MQ135(A0);
float air_quality = gasSensor.getPPM();

if(esp8266.available()) // 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 Air Pollution Monitoring System</h1>";
       webpage += "<p><h2>";   
       webpage+= " Air Quality is ";
       webpage+= air_quality;
       webpage+=" PPM";
       webpage += "<p>";
     if (air_quality<=1000)
{
  webpage+= "Fresh Air";
}
else if(air_quality<=2000 && air_quality>=1000)
{
  webpage+= "Poor Air";
}

else if (air_quality>=2000 )
{
webpage+= "Danger! Move to Fresh Air";
}

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);
     
     cipSend = "AT+CIPSEND=";
     cipSend += connectionId;
     cipSend += ",";
     cipSend +=webpage.length();
     cipSend +="\r\n";
     
     String closeCommand = "AT+CIPCLOSE="; 
     closeCommand+=connectionId; // append connection id
     closeCommand+="\r\n";
     
     sendData(closeCommand,3000,DEBUG);
    }
  }

lcd.setCursor (0, 0);
lcd.print ("Air Quality is ");
lcd.print (air_quality);
lcd.print (" PPM ");
lcd.setCursor (0,1);
if (air_quality<=1000)
{
lcd.print("Fresh Air");
digitalWrite(8, LOW);
}
else if( air_quality>=1000 && air_quality<=2000 )
{
lcd.print("Poor Air, Open Windows");
digitalWrite(8, HIGH );
}
else if (air_quality>=2000 )
{
lcd.print("Danger! Move to Fresh Air");
digitalWrite(8, HIGH);   // turn the LED on
}
lcd.scrollDisplayLeft();
delay(1000);
}
String sendData(String command, const int timeout, boolean debug)
{
    String response = ""; 
    esp8266.print(command); // send the read character to the esp8266
    long int time = millis();
    while( (time+timeout) > millis())
    {
      while(esp8266.available())
      {
        // The esp has data so display its output to the serial window 
        char c = esp8266.read(); // read the next character.
        response+=c;
      }  
    }
    if(debug)
    {
      Serial.print(response);
    }
    return response;
}

my ESP8266 (WI-FI MODULE) is not working with this code.

9 
esp8266.begin(115200); // your esp's baud rate might be different

You will be very lucky if software serial will work at 115200 baud. My experience is that software serial will not work, reliably, at more than 38400 baud. Do you know for sure what the ESP baud rate set to?

Which Arduino board is the ESP connected to?

10

yes i am sure about my baud rate and my ESP8266 is connected to Arduino UNO

11

  1. Have you connected your PC or Smartphone etc. to the wlan of the ESP8266 ? If so what network identifier (SSID) did you see ?

  2. Do you see this in the serial monitor of the PC connected to the ESP8266 :

  1. Have you typed the URL 192.168.4.1 into the web browser on your PC / Smartphone ?
12

This appears to be a cross post of ESP8266 don't show results in browser - Project Guidance - Arduino Forum

13

This appears to be a cross post of [MERGED] ESP8266 (WI-FI MODULE) is not working with code - Project Guidance - Arduino Forum

14

@ftech don't cross post threads.

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