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Elecrow ESPduino UNO+ESP8266 Wifi Board


The Elecrow ESPduino combines a Arduino UNO with a serial WiFi and can be apply on lots of project of IOT, such as Smart Home, Smart robot, Security system. The same size with more powerful function, this two in one board will give you surprise!

Same as the Arduino UNO, the ESPduino also has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, a reset button, and of course a Mini USB cable, simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

Model: ACM82664A


Microcontroller ATmega328
Operating Voltage 5v
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-15V
Digital I/O Pins 14 (of which 6PINs provide PWM output)
Analog Input Pins 8
DC Current per I/O Pin 40mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM 2 KB (ATmega328)
EEPROM 1 KB (ATmega328)
Clock Speed 16 MHz


  • Connection Mode:U(UART)
  • One high speed serial port
  • Working voltage:5v
  • 802.11 b/g/n protocol
  • Wi-Fi Direct (P2P), soft-AP
  • Integrated TCP/IP protocol stack
  • Integrated TR switch, balun, LNA, power amplifier and matching network
  • Integrated PLL, regulators, and power management units
  • +19.5dBm output power in 802.11b mode
  • Dimensions(mm):70.0(L)x55.0(W)x11.8(H)

Interface Function

ESPduino interface1.jpg

AT Commands


  • 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>
Set the network mode Check current mode Return which modes supported -


  • 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="","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+ 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>


Change the baud rate

The default baud rate of ESP8266-12E was 115200 bps, if communication with UNO software serial, it may make some mistake, we need to change it low than 19200bps. 1.upload a blink code to the ESPduino, as below:


2.we use the hardware serial[FT232] sent the AT Command to ESP8266.Connect ESP_RX TO TX and ESP_TX TO RX. Show as below:


3.Open a Serial debug tool, i use the SSCOM3.2. As below: ESPduino31.jpg

4.Change the baud of the SSCOM3.2, and sent a AT to the ESP8266, test it whether change the baud rate succeed.


Use the ESPduino as a Webserver

1.Hardware Connection.
Connected the ESP8266 to the software serial( D7 and D8) by the jumper cap.As below:
By the way, before you do that,you need to change the ESP8266 baud rate to 9600.

2.Connect the board to PC using USB cable.

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

#include <SoftwareSerial.h>

#define DEBUG true

SoftwareSerial esp8266(7,8); // make RX Arduino line is pin 7, make TX Arduino line is pin 8.
                             // This means that you need to connect the TX line from the esp to the Arduino's pin 7
                             // and the RX line from the esp to the Arduino's pin 8
void setup()
  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 
      // The esp has data so display its output to the serial window 
      char c =; // read the next character.
    } */


     int connectionId =; // 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";


     String closeCommand = "AT+CIPCLOSE="; 
     closeCommand+=5; // append connection id

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())
        // The esp has data so display its output to the serial window 
        char c =; // read the next character.

    return response;

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


5.PC connect to the wifi of ESP8266.


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




If you have any problem about how to use it, you can connect to us at the bottom-right of bazzer or contact to to get technology support.