Usage Example for Arduino-LED Control

Software Preparation

1. ESP_Flasher
2. Arduino IDE 1.0.6
3. CoolTerm
4. NetAssist

Hardware Preparation

1. DFRduino UNO R3
2. Xbee USB adapter (FTDI ready)
3. IO Expansion Shield for Arduino (V6)
4. USB Cable A-B for Arduino
5. Mini USB cable

Sample Code

This is a little application which is built on the 4.1.2 2 TCP_Client_Single trail, if you have finished that part, you could upload the sketch below, and send commands "H","L" to open up or turn off it on your computer. And since that almost every Arduino card has a LED built on board, connected with D13, so in the sketch, I will use it as the target LED.

// this example use esp8266 to connect to an Access Point and connect to SINGLE TCP Server which is at the same subnet
// such as the esp8266 is is 192.168.1.3, and the server ip is 192.168.1.1 ,then esp8266 can connect to the server

//Then connect a LED on Digital pin13, and open the software on PC_TCP server, send command to control the LED state:
//send "H" to turn ON LED; send "L" to turn OFF LED

#include "esp8266.h"
#include "SoftwareSerial.h"

#define ssid        "test"      // you need to change it
#define password    "12345678"

#define serverIP    "192.168.1.1"
#define serverPort  "8081"
int ledPin = 13;
String incomingData = "";

Esp8266 wifi;
SoftwareSerial mySerial(10, 11); // RX, TX

void setup() {
  pinMode(ledPin, OUTPUT);
  delay(2000);              // it will be better to delay 2s to wait esp8266 module OK
  Serial.begin(115200);
  mySerial.begin(115200);
  wifi.begin(&Serial, &mySerial);       //Serial is used to communicate with esp8266 module, mySerial is used to debug
  if (wifi.connectAP(ssid, password)) {
    wifi.debugPrintln("connect ap sucessful !");
  } else {
    while (true);
  }
  wifi.setSingleConnect();
  if (wifi.connectTCPServer(serverIP, serverPort)) {
    wifi.debugPrintln("connect to TCP server successful !");
  }
  String ip_addr;
  ip_addr = wifi.getIP();
  wifi.debugPrintln("esp8266 ip:" + ip_addr);
}

void loop() {
  int state = wifi.getState();
  switch (state) {
    case WIFI_NEW_MESSAGE:
      wifi.debugPrintln("new message!");
      incomingData = wifi.getMessage();
      wifi.sendMessage(incomingData);       //send the message to TCP server what it has received
      wifi.setState(WIFI_IDLE);
      break;
    case WIFI_CLOSED :                          //reconnet to the TCP server
      wifi.debugPrintln("server is closed! and trying to reconnect it!");
      if (wifi.connectTCPServer(serverIP, serverPort)) {
        wifi.debugPrintln("reconnect OK!");
        wifi.setState(WIFI_IDLE);
      }
      else {
        wifi.debugPrintln("reconnect fail");
        wifi.setState(WIFI_CLOSED);
      }
      break;
    case WIFI_IDLE :
      int sta = wifi.checkMessage();
      wifi.setState(sta);
      break;
  }
  if (incomingData == "H")  {
    digitalWrite(13, HIGH);
    incomingData = "";
  }
  else if (incomingData == "L")  {
    digitalWrite(13, LOW);
    incomingData = "";
  }
}

Running Results