ESP8266

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Hello Team,

I am having Issue while connecting ESP8266 with Arduino Mega. It always says "Module have no response."

Please check and correct me if I am wrong anywhere.

I am using below code and and wiring diagram is on this URL: http://3.bp.blogspot.com/-u7cLC4-x72c/VVGGVWfPmrI/AAAAAAAAci0/RYynhrWZQ38/s1600/wiringDiagram.png

//#include <SoftwareSerial.h>
//use mega Serial 2 for serial monitor; Serial 1 on pins 19 (RX) and 18 (TX);// Serial2 on pins 17 (RX) and 16 (TX), Serial3 on pins 15 (RX) and 14 (TX).
#define SSID "SopraSteria"
#define PASS "1234567890"
#define DST_IP "220.181.111.85" //baidu.com
//SoftwareSerial dbgSerial(10, 11); // RX, TX
void setup()
{
// Open serial communications and wait for port to open:
//serial 2 is to esp8266
Serial2.begin(115200);//9600 (mine), 57600, 115200
Serial2.setTimeout(2000);

//serial 0 is to usb
Serial.begin(115200);

while(!Serial);
while(!Serial2);

//dbgSerial.begin(9600); //can't be faster than 19200 for softserial
//dbgSerial.println("ESP8266 Demo");
Serial.println("ESP8266 Demo on Mega2560");

while(Serial2.available()>0)
Serial2.read();

delay(1000);
//test if the module is ready
Serial2.println("AT+RST");
//delay(1000);
//delay(1000);
Serial.println("Resetting module");
Serial2.flush();

//if(Serial2.find("ready"))
if(Serial2.find("Ready")||Serial2.find("ready"))
{
//dbgSerial.println("Module is ready");
Serial.println("Module is ready");
}
else
{
//dbgSerial.println("Module have no response.");
Serial.println("Module have no response.");
//while(1);
}
delay(1000);
//connect to the wifi
boolean connected=false;
for(int i=0;i<5;i++)
{
if(connectWiFi())
{
connected = true;
break;
}
}
if (!connected){
//while(1);
Serial.println("Not Connected.");
}
delay(1000);
//print the ip addr

Serial2.println("AT+CIFSR");
Serial.println("ip address:");
while (Serial2.available())
Serial.write(Serial2.read());

//set the single connection mode
Serial2.println("AT+CIPMUX=0");
}
void loop()
{
connectWiFi();
String cmd = "AT+CIPSTART="TCP","";
cmd += DST_IP;
cmd += "",80";
Serial2.println(cmd);
Serial.println(cmd);
Serial.println(cmd);
if(Serial2.find("Error")) return;
cmd = "GET / HTTP/1.0\r\n\r\n";
Serial2.print("AT+CIPSEND=");
Serial2.println(cmd.length());
if(Serial2.find(">"))
{
//dbgSerial.print(">");
Serial.print(">");
}else
{
Serial2.println("AT+CIPCLOSE");
//dbgSerial.println("connect timeout");
Serial.println("connect timeout");
delay(1000);
return;
}
Serial2.print(cmd);
delay(2000);
//Serial.find("+IPD");
while (Serial2.available())
{
char c = Serial2.read();
//dbgSerial.write(c);
Serial.write(c);
//if(c=='\r') dbgSerial.print('\n');
if(c=='\r') Serial.print('\n');
}
//dbgSerial.println("====");
Serial.println("====");
delay(1000);
}
boolean connectWiFi()
{
Serial2.println("AT+CWMODE=1");
String cmd="AT+CWJAP="";
cmd+=SSID;
cmd+="","";
cmd+=PASS;
cmd+=""";
//dbgSerial.println(cmd);
Serial2.println(cmd);
Serial.println(cmd);
delay(2000);
if(Serial2.find("OK"))
{
//dbgSerial.println("OK, Connected to WiFi.");
Serial.println("OK, Connected to WiFi.");
return true;
}else
{
//dbgSerial.println("Can not connect to the WiFi.");
Serial.println("Can not connect to the WiFi.");
return false;
}
}