Arduino Uno + ESP8266-05 ESP-05 Test connection

Testing code for ECHO from ESP8266-05 aka ESP-05 . Check the bauds on preseted by you on ESP module.

#include <SoftwareSerial.h>

SoftwareSerial esp8266(3, 2);

String readStr;

void setup() {

  Serial.begin(74880);   

  esp8266.begin(74880);

  delay(100);

  esp8266.println("AT");

  while(!esp8266.available()) {  };

  readStr = esp8266.readString();

  Serial.print("Echo:" + readStr);

  if( readStr.indexOf("OK") > -1) {

      Serial.println("AT Command Connection : OK");

  };

}

void loop() {

}