ESP8266 core for Arduino应用：ESP8266 AP Web Server之控制LED - YFROBOT创客社区

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#include <ESP8266WiFi.h>



//////////////////////

// WiFi Definitions //

//////////////////////

const char WiFiAPPSK[] = "12345678";



/////////////////////

// Pin Definitions //

/////////////////////

const int LED_PIN = 5;        // Thing's onboard, green LED

const int ANALOG_PIN = A0;    // The only analog pin on the esp8266

const int DIGITAL_PIN = 12;   // Digital pin to be read



WiFiServer server(80);



void setup() 

{

  initHardware();

  setupWiFi();

  server.begin();

}



void loop() 

{

  // Check if a client has connected

  WiFiClient client = server.available();

  if (!client) {

    return;

  }



  // Read the first line of the request

  String req = client.readStringUntil('\r');

  Serial.println(req);

  client.flush();

  

  // Match the request

  int val = -1; // We'll use 'val' to keep track of both the

                // request type (read/set) and value if set.

  if (req.indexOf("/led/0") != -1)

    val = 0; // Will write LED low

  else if (req.indexOf("/led/1") != -1)

    val = 1; // Will write LED high

  else if (req.indexOf("/read") != -1)

    val = -2; // Will print pin reads

  // Otherwise request will be invalid. We'll say as much in HTML



  // Set GPIO5 according to the request

  if (val >= 0)

    digitalWrite(LED_PIN, val);

  

  client.flush();



  // Prepare the response. Start with the common header:

  String s = "HTTP/1.1 200 OK\r\n";

  s += "Content-Type: text/html\r\n\r\n";

  s += "<!DOCTYPE HTML>\r\n<html>\r\n";

  // If we're setting the LED, print out a message saying we did

  if (val >= 0)

  {

    s += "LED is now ";

    s += (val)?"high":"low";

  }

  else if (val == -2)

  { // If we're reading pins, print out those values:

    s += "Analog Pin = ";

    s += String(analogRead(ANALOG_PIN));

    s += "<br>"; // Go to the next line.

    s += "Digital Pin 12 = ";

    s += String(digitalRead(DIGITAL_PIN));

  }

  else

  {

    s += "Invalid Request.<br> Try /led/1, /led/0, or /read.";

  }

  s += "</html>\n";



  // Send the response to the client

  client.print(s);

  delay(1);

  Serial.println("Client disonnected");



  // The client will actually be disconnected 

  // when the function returns and 'client' object is detroyed

}



void setupWiFi()

{

  WiFi.mode(WIFI_AP);

  

  // Do a little work to get a unique-ish name. Append the

  // last two bytes of the MAC (HEX'd) to "Thing-":

  uint8_t mac[WL_MAC_ADDR_LENGTH];

  WiFi.softAPmacAddress(mac);

  String macID = String(mac[WL_MAC_ADDR_LENGTH - 2], HEX) +

                 String(mac[WL_MAC_ADDR_LENGTH - 1], HEX);

  macID.toUpperCase();

  String AP_NameString = "ESP8266 Thing " + macID;

  

  char AP_NameChar[AP_NameString.length() + 1];

  memset(AP_NameChar, AP_NameString.length() + 1, 0);

  

  for (int i=0; i<AP_NameString.length(); i++)

    AP_NameChar = AP_NameString.charAt(i);

  

  WiFi.softAP(AP_NameChar, WiFiAPPSK);



  Serial.println();

  Serial.print ( "IP address: " );

  Serial.println ( WiFi.softAPIP() );

  

}



void initHardware()

{

  Serial.begin(115200);

  pinMode(DIGITAL_PIN, INPUT_PULLUP);

  pinMode(LED_PIN, OUTPUT);

  digitalWrite(LED_PIN, LOW);

  // Don't need to set ANALOG_PIN as input, 

  // that's all it can be.

}