ESP32 Forum

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/*
  WiFiAccessPoint.ino creates a WiFi access point and provides a web server on it.

  Steps:
  1. Connect to the access point "yourAp"
  2. Point your web browser to http://192.168.4.1/H to turn the LED on or http://192.168.4.1/L to turn it off
     OR
     Run raw TCP "GET /H" and "GET /L" on PuTTY terminal with 192.168.4.1 as IP address and 80 as port

  Created for arduino-esp32 on 04 July, 2018
  by Elochukwu Ifediora (fedy0)
*/

#include <WiFi.h>
#include <WiFiClient.h>
#include <WiFiAP.h>

#define LED_BUILTIN 2   // Set the GPIO pin where you connected your test LED or comment this line out if your dev board has a built-in LED
int blinker = 0;

// Set these to your desired credentials.
const char *ssid = "ESPTEST";
const char *password = "password:)";

WiFiServer server(80);


void setup() {
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  Serial.println();
  Serial.println("Configuring access point...");

  // You can remove the password parameter if you want the AP to be open.
  WiFi.softAP(ssid, password);
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  Serial.println(ssid);
  Serial.println(password);
  server.begin();

  Serial.println("Server started");
}

void loop() {
  WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,
    Serial.println("New Client.");           // print a message out the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println();

            // the content of the HTTP response follows the header:
            client.print("<br><br>Click <a href=\"/H\">here</a> to turn ON the LED.<br><br><br>");
            client.print("Click <a href=\"/L\">here</a> to turn OFF the LED.<br><br><br>");
            client.print("Click <a href=\"/B\">here</a> to make LED blink<br>");

            // The HTTP response ends with another blank line:
            client.println();
            // break out of the while loop:
            break;
          } else {    // if you got a newline, then clear currentLine:
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }

        // Check to see if the client request was "GET /H" or "GET /L": or /B
        if (currentLine.endsWith("GET /H")) {
          digitalWrite(LED_BUILTIN, HIGH); // GET /H turns the LED on
          blinker = 0;
        }
        if (currentLine.endsWith("GET /L")) {
          digitalWrite(LED_BUILTIN, LOW);                // GET /L turns the LED off
          blinker = 0;
        }
       if (currentLine.endsWith("GET /B")) {
          blinker = 1;
          blink();                                       // GET /B blinks
        }
      }
    }
    // close the connection:
    client.stop();
    Serial.println("Client Disconnected.");
  }
}

void blink(){
  while(blinker > 0) {
  digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
  // but actually the LED is on; this is because
  // it is active low on the ESP-01)
  delay(random(40,100));                      
  digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
  delay(random(50,200));
  }                     
}

Code: Select all

void blink(){
  static uint32_t 
    lastBlink = 0,  // when the last blink occurred (so you can do proper math on millis() time...)
    blinkTime=0;  // when the next state change should occur
  uint32_t now=millis();  // get current time
  if (blinker > 0) {   // if the blinker control is set, check the timer
    if (blinkTime < now-lastBlink) {  // this reduces the rollover problem by using unsigned math to get the time difference
      lastBlink = now;  // reset the timer
      if (digitalRead(LED_BUILTIN))  {  // is it currently off?
        // yes, turn it on and set the timer
       digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on (Note that LOW is the voltage level
       // but actually the LED is on; this is because
       // it is active low on the ESP-01)
       blinkTime = random(40,100);  // how long to stay on
     } else {                     
       digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off by making the voltage HIGH
       blinkTime = random(50,200);  // how long to stay off
     }
   } // end of timer check
  } else  // blinker is false
  if (lastBlink) {  // blinker should be off, reset the timers and make sure the LED is off (do this only once blinker goes false)
    lastBlink = 0;
    blinkTime=0;
    digitalWrite(LED_BUILTIN, HIGH);
  }                    
}