Serial WIFI Transceiver Module ESP8266

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Contents

Description

This serial WiFi transceiver module is based on ESP8266 SoC.. ESP8266 is a highly integrated chip that has Integrated TCP/IP protocol stack. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor.
Besides, ESP8266 has powerful on-board processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. Its high degree of on-chip integration allows for minimal external circuitry, and the entire solution, including front-end module, is designed to occupy minimal PCB area.
Model:WWI8266ESP

Serial WIFI Transceiver Module ESP8266.jpg

Feature

  • 3SDIO 2.0, SPI, UART
  • 32-pin QFN package
  • Integrated RF switch, balun, 24dBm PA, DCXO, and PMU
  • Integrated RISC processor, on-chip memory and external memory interfaces
  • Integrated MAC/baseband processors
  • Quality of Service management
  • I2S interface for high fidelity audio applications
  • On-chip low-dropout linear regulators for all internal supplies
  • Proprietary spurious-free clock generation architecture
  • Integrated WEP, TKIP, AES, and WAPI engines

Specification

  • 802.11 b/g/n
  • Wi-Fi Direct (P2P), soft-AP
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLLs, regulators, DCXO and power management units
  • +19.5dBm output power in 802.11b mode
  • Power down leakage current of <10uA
  • Integrated low power 32-bit CPU could be used as application processor
  • SDIO 1.1/2.0, SPI, UART
  • STBC, 1×1 MIMO, 2×1 MIMO
  • A-MPDU & A-MSDU aggregation & 0.4ms guard interval
  • Wake up and transmit packets in < 2ms
  • Standby power consumption of < 1.0mW (DTIM3)

Interface Function

WWI8266ESPP pro 1.jpg

AT Commands

Format

  • Baud rate at 115200
  • x is the commands

ESP8266 AT Test.png

(Click the picture to zoom in)

Set Inquiry Test Execute
AT+<x>=<…> AT+<x>? AT+<x>=? AT+<x>
AT+CWMODE=<mode> AT+CWMODE? AT+CWMODE=? -
Set the network mode Check current mode Return which modes supported -

Commands

  • carefully there are must be no any spaces between the " and IP address or port

Commands

Description

Type

Set/Execute

Inquiry

test

Parameters and Examples

AT

general test

basic

-

-

-

-

AT+RST

restart the module

basic

-

-

-

-

AT+GMR

check firmware version

basic

-

-

-

-

AT+CWMODE

wifi mode

wifi

AT+CWMODE=<mode>

AT+CWMODE?

AT+CWMODE=?

1= Sta, 2= AP, 3=both, Sta is the default mode of router, AP is a normal mode for devices

AT+CWJAP

join the AP

wifi

AT+ CWJAP =<ssid>,< pwd >

AT+ CWJAP?

-

ssid = ssid, pwd = wifi password

AT+CWLAP

list the AP

wifi

AT+CWLAP

AT+CWQAP

quit the AP

wifi

AT+CWQAP

-

AT+CWQAP=?

AT+ CWSAP

set the parameters of AP

wifi

AT+ CWSAP= <ssid>,<pwd>,<chl>, <ecn>

AT+ CWSAP?

ssid, pwd, chl = channel, ecn = encryption; eg. Connect to your router: AT+CWJAP="www.electrodragon.com","helloworld"; and check if connected: AT+CWJAP?

AT+CWLIF

check join devices' IP

wifi

AT+CWLIF

-

-

AT+ CIPSTATUS

get the connection status

TCP/IP

AT+ CIPSTATUS

<id>,<type>,<addr>,<port>,<tetype>= client or server mode

AT+CIPSTART

set up TCP or UDP connection

TCP/IP

1)single connection (+CIPMUX=0) AT+CIPSTART= <type>,<addr>,<port>; 2) multiple connection (+CIPMUX=1) AT+CIPSTART= <id><type>,<addr>, <port>

-

AT+CIPSTART=?

id = 0-4, type = TCP/UDP, addr = IP address, port= port; eg. Connect to another TCP server, set multiple connection first: AT+CIPMUX=1; connect: AT+CIPSTART=4,"TCP","X1.X2.X3.X4",9999

AT+CIPMODE

set data transmission mode

TCP/IP

AT+CIPMODE=<mode>

AT+CIPSEND?

0 not data mode, 1 data mode; return "Link is builded"

AT+CIPSEND

send data

TCP/IP

1)single connection(+CIPMUX=0) AT+CIPSEND=<length>; 2) multiple connection (+CIPMUX=1) AT+CIPSEND= <id>,<length>

AT+CIPSEND=?

eg. send data: AT+CIPSEND=4,15 and then enter the data.

AT+CIPCLOSE

close TCP or UDP connection

TCP/IP

AT+CIPCLOSE=<id> or AT+CIPCLOSE

AT+CIPCLOSE=?

AT+CIFSR

Get IP address

TCP/IP

AT+CIFSR

AT+ CIFSR=?

AT+ CIPMUX

set mutiple connection

TCP/IP

AT+ CIPMUX=<mode>

AT+ CIPMUX?

0 for single connection 1 for multiple connection

AT+ CIPSERVER

set as server

TCP/IP

AT+ CIPSERVER= <mode>[,<port> ]

mode 0 to close server mode, mode 1 to open; port = port; eg. turn on as a TCP server: AT+CIPSERVER=1,8888, check the self server IP address: AT+CIFSR=?

AT+ CIPSTO

Set the server timeout

AT+CIPSTO=<time>

AT+CIPSTO?

<time>0~28800 in second

+IPD

received data

For Single Connection mode(CIPMUX=0): + IPD, <len>:
For Multi Connection mode(CIPMUX=1): + IPD, <id>, <len>: <data>

Usage

Use the ESP8266-01 and Arduino as a Webserver

1.Hardware Connection.
Connected the Serial Wifi to U2 of the Crowtail- base shiled( D2 and D3) are used as software UART. Baud Rate:9600.
Esp8266hardwareconnect.jpg Esp8266hardwareconnect1.jpg
2.Connect the board to PC using USB cable.

3:Download the code: Webserver_for_ESP8266-01 or copy it to you new skecth.

#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 World!</h1>";
     String 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;
}
 

4.Upload the code and Open the serial monitor.You can see some configuration information.

Configuration1.jpg

5.PC connect to the wifi of ESP8266.

Esp8266connect1.jpg

6.Then you can visit the Webserver of the ESP8266.

ESP8266result2.jpg

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