How To Use the ESP8266 and Arduino as a Webserver

by Miguel on December 30, 2014

in ESP8266

Video Tutorial: How The Code Works

The video below shows you how the ESP8266 works as a webserver with the Arduino using the code below.
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Arduino Webserver Code/Sketch For ESP8266

The code handles the ESP8266’s initialization in the setup() function: it resets the module, configures it as an access point, prints out the module’s ip address, configures for multiple connections, configures as a server on port 80.

When there is data available if the string +IPD is in the serial data then the HTTP response is sent to the browser or device requesting it.

#include <SoftwareSerial.h>
#define DEBUG true
SoftwareSerial esp8266(2,3); // make RX Arduino line is pin 2, make TX Arduino line is pin 3.
 // This means that you need to connect the TX line from the esp to the Arduino's pin 2
 // and the RX line from the esp to the Arduino's pin 3
void setup()
{
 Serial.begin(9600);
 esp8266.begin(9600); // 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+CIPMUX=1\r\n",1000,DEBUG); // configure for multiple connections
 sendData("AT+CIPSERVER=1,80\r\n",1000,DEBUG); // turn on server on port 80
}
void loop()
{
 if(esp8266.available()) // check if the esp is sending a message 
 {
 /*
 while(esp8266.available())
 {
 // The esp has data so display its output to the serial window 
 char c = esp8266.read(); // read the next character.
 Serial.write(c);
 } */
 
 if(esp8266.find("+IPD,"))
 {
 delay(1000);
 int connectionId = esp8266.read()-48; // subtract 48 because the read() function returns 
 // the ASCII decimal value and 0 (the first decimal number) starts at 48
 
 String webpage = "<h1>Hello</h1>&lth2>World!</h2><button>LED1</button>";
 String cipSend = "AT+CIPSEND=";
 cipSend += connectionId;
 cipSend += ",";
 cipSend +=webpage.length();
 cipSend +="\r\n";
 
 sendData(cipsend,1000,DEBUG);
 sendData(webpage,1000,DEBUG);
 
 webpage="<button>LED2</button>";
 
 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; // append connection id
 closeCommand+="\r\n";
 
 sendData(closeCommand,3000,DEBUG);
 }
 }
}
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;
}