main.cpp

/*
* based on https://www.az-delivery.de/blogs/azdelivery-blog-fur-arduino-und-raspberry-pi/html-buttons
* the aim is to controll 2 relays that close the cirquit to a shutter controller
* feel free to suggest improvement
*
* Style Guidlines for the future: I use sublime text and
* https://packagecontrol.io/packages/SublimeAStyleFormatter
* for formatting.
* otherwise see: http://www.cs.umd.edu/~nelson/classes/resources/cstyleguide/
* for style guide.
*/
// https://github.com/esp8266/Arduino/tree/master/libraries/ESP8266WiFi
#include <ESP8266WiFi.h>
#include <string.h>
// Replace with your network credentials
const char * ssid = "WiFi Name", password = "Password";
const int pin_up = 14, pin_down = 12;
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
// Auxiliar variables to store the current output state
String output_up = "stop", output_down = "stop", header;
void setup()
{
  pinMode(pin_up, OUTPUT);
  pinMode(pin_down, OUTPUT);
  Serial.begin(115200);
  // Set outputs to LOW
  digitalWrite(pin_up, LOW);
  digitalWrite(pin_down, LOW);
  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: "); // IP Address can be set constant in the Router settings. Go to your router, check how to access the settings --> DHCP --> reserve IP address
  Serial.println(WiFi.localIP());
  server.begin();
}

void loop()
{
  WiFiClient client = server.available(); // Listen for incoming clients
  if (client)
  {
    // If a new client connects,
    Serial.println("New Client."); // print a message out in 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
        header += c;
        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("Connection: close");
            client.println();
            // turns the GPIOs on and off
            if (header.indexOf("GET /up") >= 0)
            {
              Serial.println("shutters moving up");
              output_up = "up";
              digitalWrite(pin_up, HIGH);
              delay(0.2 * 1000);
              output_up = "stop";
              digitalWrite(pin_up, LOW);
            }
            else if (header.indexOf("GET /down") >= 0)
            {
              Serial.println("shutters moving down");
              output_down = "down";
              digitalWrite(pin_down, HIGH);
              delay(0.2 * 1000);
              output_down = "stop";
              digitalWrite(pin_down, LOW);
            }
            // Hier wird nun die HTML Seite angezeigt:
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            // Es folgen der CSS-Code um die Ein/Aus Buttons zu gestalten
            // Hier können Sie die Hintergrundfarge (background-color) und Schriftgröße (font-size) anpassen
            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
            client.println(".button { background-color: #333344; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #888899;}</style></head>");
            client.println("<body><h1>Open window shutters</h1>");
            // Display current state of the up button
            client.println("<p>moving " + output_up + "</p>");
            // If the output4State is off, it displays the ON button
            if (output_down == "up")
            {
              client.println("<p><a href=\"/up\"><button class=\"button\">UP</button></a></p>");
            }
            else if (output_down == "stop")
            {
              client.println("<p><a href=\"/up\"><button class=\"button\">UP</button></a></p>");
            }
            // Display current state of down button
            client.println("<p>moving " + output_down + "</p>");
            if (output_down == "down")
            {
              client.println("<p><a href=\"/down\"><button class=\"button\">DOWN</button></a></p>");
            }
            else if (output_down == "stop")
            {
              client.println("<p><a href=\"/down\"><button class=\"button\">DOWN</button></a></p>");
            }
            client.println("</body></html>");
            // 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
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}