WiFi Serial Transceiver Module w/ ESP8266 - 1MB Flash

資料來源：http://www.seeedstudio.com/wiki/WiFi_Serial_Transceiver_Module

Tutorial for ESP8266 Serial WiFi Module

In this tutorial, we'll use a seeeduino to control the ESP8266 WiFi module to request a static page from the internet. This is a basic use of TCP socket, for other usage, please refer to the AT command guide of the module.

Material list:

   Seeeduino V3 / Arduino Uno
   ESP8266 Serial WiFi module
   UartSBee v4 / other USB to TTL converter

Note： We used a software serial to print some debugging information as there’s only one hardware serial on seeeduino board. But the limitation of software serial is that it can’t communicate in a higher baud rate than 19200. So part of the output from ESP module will be dropped because the baud rate 57600 of ESP module is higher than that of the software serial. If you have a board with more than one hardware serial (e.g. Arduino Mega 2560), the case will be easier.

Step-By-Step

Step 1: connect module as the following picture

Step 2: Programe the seeeduino board.

1. Open Arduino IDE and create a new sketch;
2. Parse the following code into the sketch editor (need modifying the SSID and PASS macros into your own situation);

   #include <SoftwareSerial.h>
   #define SSID "xxxxxxxx"
   #define PASS "xxxxxxxx"
   #define DST_IP "220.181.111.85" //baidu.com
   SoftwareSerial dbgSerial(10, 11); // RX, TX
   void setup()
   {
     // Open serial communications and wait for port to open:
     Serial.begin(57600);
     Serial.setTimeout(5000);
     dbgSerial.begin(9600); //can't be faster than 19200 for softserial
     dbgSerial.println("ESP8266 Demo");
     //test if the module is ready
     Serial.println("AT+RST");
     delay(1000);
     if(Serial.find("ready"))
     {
       dbgSerial.println("Module is ready");
     }
     else
     {
       dbgSerial.println("Module have no response.");
       while(1);
     }
     delay(1000);
     //connect to the wifi
     boolean connected=false;
     for(int i=0;i<5;i++)
     {
       if(connectWiFi())
       {
         connected = true;
         break;
       }
     }
     if (!connected){while(1);}
     delay(5000);
     //print the ip addr
     /*Serial.println("AT+CIFSR");
     dbgSerial.println("ip address:");
     while (Serial.available())
     dbgSerial.write(Serial.read());*/
     //set the single connection mode
     Serial.println("AT+CIPMUX=0");
   }
   void loop()
   {
     String cmd = "AT+CIPSTART=\"TCP\",\"";
     cmd += DST_IP;
     cmd += "\",80";
     Serial.println(cmd);
     dbgSerial.println(cmd);
     if(Serial.find("Error")) return;
     cmd = "GET / HTTP/1.0\r\n\r\n";
     Serial.print("AT+CIPSEND=");
     Serial.println(cmd.length());
     if(Serial.find(">"))
     {
       dbgSerial.print(">");
       }else
       {
         Serial.println("AT+CIPCLOSE");
         dbgSerial.println("connect timeout");
         delay(1000);
         return;
       }
       Serial.print(cmd);
       delay(2000);
       //Serial.find("+IPD");
       while (Serial.available())
       {
         char c = Serial.read();
         dbgSerial.write(c);
         if(c=='\r') dbgSerial.print('\n');
       }
       dbgSerial.println("====");
       delay(1000);
     }
     boolean connectWiFi()
     {
       Serial.println("AT+CWMODE=1");
       String cmd="AT+CWJAP=\"";
       cmd+=SSID;
       cmd+="\",\"";
       cmd+=PASS;
       cmd+="\"";
       dbgSerial.println(cmd);
       Serial.println(cmd);
       delay(2000);
       if(Serial.find("OK"))
       {
         dbgSerial.println("OK, Connected to WiFi.");
         return true;
         }else
         {
           dbgSerial.println("Can not connect to the WiFi.");
           return false;
         }
       }

Step 3: Open Serial Monitor and press the reset button of seeeduino board, you’ll see the output.

At last, Happy Hakcing! :)

Related Projects

Recipe Community is an awesome place where makers share their amazing works here. Our makers have made a lot of awesome projects with esp8266, check this out!

WiFi Scanner -Know the WiFi Signal around you

Build your own Wifi Scanner with few simple steps, all you need to do is prepare:

• A NodeMcu Dev. Board
• An I2C OLED.
• Some cables
• And most importantly, a HOT HEART ON ESP8266

So, why not make one for yourself?

Primary IoT Make with NodeMcu ->ESP8266<-

An online Temperature&Humidity Monitor made with:

• A NodeMcu Dev. Board
• Grove - Temp&Humi Sensor
• Some cables

Another easy trick, why not make one for yourself?

Na, not enough? More Awesome Projects with ESP8266.

Even more Awesome Projects On Recipe.

Share Your Awesome Projects with Us

Born with the spirit of making and sharing, that is what we believe makes a maker.

And only because of this , the open source community can be as prosperous as it is today.

It does not matter what you are and what you have made, hacker, maker, artist and engineers,

as long as you start sharing your works with others, you are being part of the open source community and you are making your contributions.

Now share you awesome projects with us on Recipe, and win a chance to become the Core User of Seeed.

• Core Users, are those who show high interests and significant contributions in Seeed products.
• We cooperate with our Core Users in the development of our new product, which in another word, the Core Users will have the chance to experience any new products of Seeed before its official launch, and in return we expect valuable feedback from them to help us improving the product performance and user experience.
• Also, join the Core User Group, engage with other Core Users of Seeed and make friends with like-minded people, could be a wonder experience for you.
• And most importantly, in most of cases, if our Core Users have any good ideas about making somethings new, something creative, as long as they provide us a proposal of it, we'll offer hardware pieces, PCBA/CNC/3D Printing services, as well as technical support, to help them achieve their projects.

Get more information about Core User please email to: recipe@seeed.cc

Share Your Feedback on Seeed Wiki

Now, to enhance user experience and improve learning platform, exciting task of waiting for you. Seeed Wiki team are collecting feedback on our Wiki pages to perfect it. Please join us.

Just tell me your suggestion, or complaints, even feelings via email: ruiyun.liu@seeed.cc