Arduino WiFi

Add WiFi(ESP8266) to Arduino UNO

If ESP-01 Adapter is used, Connect VCC=5V.

If ESP9266 module is used, Connect VCC=3.3V

아두이노(Arduino) 인터넷 연결하기: ESP-01(ESP8266) 와이파이 모듈(Wifi module) 어댑터 배선 \

Arduino sketch code

#include <SoftwareSerial.h>

SoftwareSerial ESPserial(2, 3); // RX | TX

void setup()

{

//Serial.begin(115200); // communication with the host computer
Serial.begin(9600); // communication with the host computer

//while (!Serial) { ; }

// Start the software serial for communication with the ESP8266

ESPserial.begin(115200);
//ESPserial.begin(9600); // communication with the host computer

Serial.println("");

Serial.println("Remember to to set Both NL & CR in the serial monitor.");

Serial.println("Ready");

Serial.println("");

}

void loop()

{

// listen for communication from the ESP8266 and then write it to the serial monitor

if ( ESPserial.available() ) { 
  //Serial.println("received"); 
  Serial.write( ESPserial.read() ); }

// listen for user input and send it to the ESP8266

if ( Serial.available() ) { 
  //Serial.println("read");
  ESPserial.write( Serial.read() ); }

}

First use UNO-PC Serial Baud 9600, UNO-ESP Serial Baud 115200

In Serial Monitor (Baud 9600) : Type

AT                          // should get OK response
AT+UART_DEF=9600,8,1,0,0    // to change UNO-ESP baudrate to 9600*

Now, we have changed ESP8266 Serial to 9600.

Modify the Arduino Sketch to ESPserial.begin(115200); and upload again.

AT+CWMODE?                  // Current Connection Mode
AT+CWMODE=1                 // Change Connection Mode to Mode=1 (Station mode)
AT+CWLAP                    // Show List of Avaiable WiFi
AT+CWJAP="SSID","비밀번호" // Connect with SSID and Password
AT+CIFSR                    // Check IP and MAC

ESP8266 와이파이 모듈은 네트워크 연결에 대해 3가지 모드를 제공합니다.