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I am trying to learn internet of things with smart home. I will connect an ESP8266 and an Arduino with the IBM Bluemix server to control a circuit from a public IP.

I want to start with the local network for now. I have gone through a couple of links which seem like a great start http://allaboutee.com/2014/12/30/esp8266-and-arduino-webserver/

They explain how it works, and have source code but no circuit diagram. How should I connect the ESP8266 with Arduino for this example ?

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#include <SoftwareSerial.h>

const byte rxPin = 2; // Wire this to Tx Pin of ESP8266
const byte txPin = 3; // Wire this to Rx Pin of ESP8266

// We'll use a software serial interface to connect to ESP8266
SoftwareSerial esp8266(rxPin,txPin);

void setup() {
  Serial.begin(9600);
  esp8266.begin(9600);
  delay(1000);
}

void loop() {
  Serial.println("Sending an AT commands");
  esp8266.println("AT");
  delay(30);
  while(esp8266.available()) {
    String data = esp8266.readStringUntil('\n');
    Serial.println("Got response from esp8266: " + data);
  }
}
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The exact same way as any other ESP8266 example. The fact that you are using it as a web server doesn't change how you wire it.

For that specific code snippet it even tells you in the comments:

// 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
  • In case of ESP8266 act as web server, can we connect TX/RS of ESP8200 to any digital pins of arduino ? – N Sharma Apr 29 '17 at 12:10
  • 2
    Like I said: the fact you're using it as a web server makes absolutely no difference to how you wire it. It's using SoftwareSerial. SoftwareSerial will work on any pins. Take your pick. – Majenko Apr 29 '17 at 12:45
  • I have this code pastebin.com/1miy33ne but esp is not sending a message as this condition while(esp8266.available()) { always fails – N Sharma Apr 29 '17 at 13:08
  • I have added my pictorial representation of my project in question – N Sharma Apr 29 '17 at 13:21
  • 2
    Another hint: Do a google image search for "ESP8266 Arduino". You will get thousands of pictures showing you how to wire it. – Majenko Apr 29 '17 at 13:56

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