Crowtail- Serial Wifi

Description

The serial wifi module based on ESP-12.which is an ultra-low power UART-WiFi module. It has excellent dimensions and ULP technology compared to other similar modules. The module is special design for mobile devices and Internet of Things . Once firmware is upgraded to the appropriate version, a compatible Android device can run the IOT.APK to do the following:control the PWM, I/O pin, or Serial communication. For example,you can use this module transmit date with it serial port.It is easy to communication with other device.

Model: CT0019SW

Features

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):45.0(L)x20.0(W)x6.8(H)

Electronic Characteristics

1.Current Consumption

The following current consumption is based on 3.3V supply, and 25℃ ambient, using internal regulators. Measurements are done at antenna port without SAW filter. All the transmitter’s measurements are based on 90% duty cycle, continuous transmit mode.

Mode	Min	Typ	Max	Unit
Transmit 802.11b, CCK 1Mbps, POUT=+19.5dBm		215		mA
Transmit 802.11b, CCK 11Mbps, POUT=+18.5dBm		197		mA
Transmit 802.11g, OFDM 54Mbps, POUT =+16dBm		145		mA
Transmit 802.11n, MCS7, POUT=+14dBm		135		mA
Receive 802.11b, packet length=1024 byte, -80dBm		100		mA
Receive 802.11g, packet length=1024 byte, -70dBm		100		mA
Receive 802.11n, packet length=1024 byte, -65dBm		102		mA
Total shutdown		0.5		uA

2.RF Performance

The following are measured under room temperature conditions with 3.3V and 1.1V power supplies.

Description	Min	Typical	Max	Unit
Input frequency	2412		2484	MHz
Input impedance		50		Ω
Input reflection			-10	dB
Output power of PA for 72.2Mbps	14	15	16	dBm
Output power of PA for 11b mode	17.5	18.5	19.5	dBm
Sensitivity
CCK, 1Mbps		-98		dBm
CCK, 11Mbps		-91		dBm
6Mbps (1/2 BPSK)		-93		dBm
54Mbps (3/4 64-QAM)		-75		dBm
HT20, MCS7 (65Mbps, 72.2Mbps)		-71		dBm

Hardware

Schematic

Application Notes

Smart power plugs
Home automation
Mesh network
Industrial wireless control
Baby monitors
IP Cameras
Sensor networks
Wearable electronics
Wi-Fi location-aware devices
Security ID tags
Wi-Fi position system beacons

AT Commands

Format

Baud rate at 115200
x is the commands

(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 ESP8266-12 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.

2.Connect the board to PC using USB cable.

3:Download the code: WWebserver for ESPduino 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+=5; // 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.

5.PC connect to the wifi of ESP8266.

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

Upgrading ESP8266 Firmware

How to upgrade ESP8266 firmware?

We use NodeMCU flasher here, the download links:

English version: https://github.com/nodemcu/nodemcu-flasher

Note: use nodemcu flasher to flash Firmware to ESP8266, its default firmware is Lau language. If you want to flash AT Commands firmware, go to ESP8266 forum to get one.

Chinese version: File:ESP8266Flasher-x86-v0.9.2.3.zip

1. Connect your ESP8266 module as follows:

Vcc = 3.3V (needs around 300-400mA peak)
Gnd = -ve ground
CH_PD = Chip enable so always +ve
RST = Leave floating or ground to reset
GPIO0 = Normally floating but this needs to be grounded when you start the update.
GPIO2 = high level
UTXD = Tx data connect to RX on FTDI/Serial interface
URXD = Rx data connect to TX of FTDI/Serial interface

English Version: Please refer to the NodeMCU flasher user guide.

Chinese Version: Please see the next step below

2. Open the software, choose the right COM and click the button that is circled in the following picture. When a tick appears in the bottom-left corner, it suggests that the firmware upgrade successfully.

3. This software contains an existing firmware, but if you want to upgrade other ESP8266 firmware, please click the button that is circled in the following picture, and only two file paths are available to choose.

Other ways of ESP8266 firmware upgrading

Useful Link

Reference:

Example

Arduino Smart Home for Environment Tree
The ESP8266 Becomes a Terrible Browser - http://hackaday.io/project/3072/instructions
http://blog.iteadstudio.com/esp8266-use-android-phone-to-control-itead-rboard/
SDK for ESP8266 - http://hackaday.com/2014/10/25/an-sdk-for-the-esp8266-wifi-chip/
An ESP8266 Based Smartmeter - http://hackaday.com/2014/10/25/an-sdk-for-the-esp8266-wifi-chip/

Crowtail- Serial Wifi

Contents

Description

Features

Electronic Characteristics

Hardware

Schematic

Application Notes

AT Commands

Usage

Use the ESP8266-12 and Arduino as a Webserver

Upgrading ESP8266 Firmware

Useful Link

Resource

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