final-test-homeautomation-ethernet

#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>
#include <Servo.h>
#include "DHT.h"


// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ   60

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 0, 20); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80
File webFile;               // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0;              // index into HTTP_req buffer


boolean LED_state[4] = {0}; // stores the states of the LEDs



DHT dht;

Servo servo;
int angle = 10;

void setup()
{


  dht.setup(14); // data pin 2

  // disable Ethernet chip
  pinMode(10, OUTPUT);
  digitalWrite(10, HIGH);

  Serial.begin(9600);       // for debugging

  // initialize SD card
  Serial.println("Initializing SD card...");
  if (!SD.begin(4)) {
    Serial.println("ERROR - SD card initialization failed!");
    return;    // init failed
  }
  Serial.println("SUCCESS - SD card initialized.");
  // check for index.htm file
  if (!SD.exists("index.htm")) {
    Serial.println("ERROR - Can't find index.htm file!");
    return;  // can't find index file
  }
  Serial.println("SUCCESS - Found index.htm file.");
  // switches on pins 2, 3 and 5
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(5, INPUT);
  // LEDs
  pinMode(6, OUTPUT);
  servo.attach(7);
  servo.write(10);
  //pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

  Ethernet.begin(mac, ip);  // initialize Ethernet device
  server.begin();           // start to listen for clients
}

void loop()
{

  EthernetClient client = server.available();  // try to get client

  if (client) {  // got client?
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {   // client data available to read
        char c = client.read(); // read 1 byte (character) from client
        // limit the size of the stored received HTTP request
        // buffer first part of HTTP request in HTTP_req array (string)
        // leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
        if (req_index < (REQ_BUF_SZ - 1)) {
          HTTP_req[req_index] = c;          // save HTTP request character
          req_index++;
        }
        // last line of client request is blank and ends with \n
        // respond to client only after last line received
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          // remainder of header follows below, depending on if
          // web page or XML page is requested
          // Ajax request - send XML file
          if (StrContains(HTTP_req, "ajax_inputs")) {
            // send rest of HTTP header
            client.println("Content-Type: text/xml");
            client.println("Connection: keep-alive");
            client.println();
            SetLEDs();
            // send XML file containing input states
            XML_response(client);
          }
          else {  // web page request
            // send rest of HTTP header
            client.println("Content-Type: text/html");
            client.println("Connection: keep-alive");
            client.println();
            // send web page
            webFile = SD.open("index.htm");        // open web page file
            if (webFile) {
              while (webFile.available()) {
                client.write(webFile.read()); // send web page to client
              }
              webFile.close();
            }
          }
          // display received HTTP request on serial port
          Serial.print(HTTP_req);
          // reset buffer index and all buffer elements to 0
          req_index = 0;
          StrClear(HTTP_req, REQ_BUF_SZ);
          break;
        }
        // every line of text received from the client ends with \r\n
        if (c == '\n') {
          // last character on line of received text
          // starting new line with next character read
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // a text character was received from client
          currentLineIsBlank = false;
        }
      } // end if (client.available())
    } // end while (client.connected())
    delay(1);      // give the web browser time to receive the data
    client.stop(); // close the connection
  } // end if (client)
}

// checks if received HTTP request is switching on/off LEDs
// also saves the state of the LEDs
void SetLEDs(void)
{
  // LED 1 (pin 6)
  if (StrContains(HTTP_req, "LED1=1")) {
    LED_state[0] = 1;  // save LED state
    digitalWrite(6, HIGH);
  }
  else if (StrContains(HTTP_req, "LED1=0")) {
    LED_state[0] = 0;  // save LED state
    digitalWrite(6, LOW);
  }
  // LED 2 (pin 7)
  if (StrContains(HTTP_req, "LED2=1")) {
    LED_state[1] = 1;  // save LED state
    servo.write(100);
    //digitalWrite(7, HIGH);
  }
  else if (StrContains(HTTP_req, "LED2=0")) {
    LED_state[1] = 0;  // save LED state
    servo.write(10);
    //digitalWrite(7, LOW);
  }
  // LED 3 (pin 8)
  if (StrContains(HTTP_req, "LED3=1")) {
    LED_state[2] = 1;  // save LED state
    digitalWrite(8, HIGH);
  }
  else if (StrContains(HTTP_req, "LED3=0")) {
    LED_state[2] = 0;  // save LED state
    digitalWrite(8, LOW);
  }
  // LED 4 (pin 9)
  if (StrContains(HTTP_req, "LED4=1")) {
    LED_state[3] = 1;  // save LED state
    digitalWrite(9, HIGH);
  }
  else if (StrContains(HTTP_req, "LED4=0")) {
    LED_state[3] = 0;  // save LED state
    digitalWrite(9, LOW);
  }
}

// send the XML file with analog values, switch status
//  and LED status
void XML_response(EthernetClient cl)
{
  int analog_val;            // stores value read from analog inputs
  int count;                 // used by 'for' loops
  int sw_arr[] = {2, 3, 5};  // pins interfaced to switches
  int  humidity = dht.getHumidity();
  int  temperature = dht.getTemperature();
  //  delay(dht.getMinimumSamplingPeriod());
  cl.print("<?xml version = \"1.0\" ?>");
  cl.print("<inputs>");
  // read analog inputs
  for (count = 2; count <= 2; count++) { // A2 to A5
    cl.print("<analog>");
    cl.print(humidity);
    cl.println("%</analog>");
  }
  for (count = 2; count <= 2; count++) { // A2 to A5
    cl.print("<analog>");
    cl.print(temperature);
    cl.println("'C</analog>");
  }


  // button LED states
  // LED1
  cl.print("<LED>");
  if (LED_state[0]) {
    cl.print("on");
  }
  else {
    cl.print("off");
  }
  cl.println("</LED>");
  // LED2
  cl.print("<LED>");
  if (LED_state[1]) {
    cl.print("on");
  }
  else {
    cl.print("off");
  }
  cl.println("</LED>");
  // LED3
  cl.print("<LED>");
  if (LED_state[2]) {
    cl.print("on");
  }
  else {
    cl.print("off");
  }
  cl.println("</LED>");
  // LED4
  cl.print("<LED>");
  if (LED_state[3]) {
    cl.print("on");
  }
  else {
    cl.print("off");
  }
  cl.println("</LED>");

  cl.print("</inputs>");
}

// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
  for (int i = 0; i < length; i++) {
    str[i] = 0;
  }
}

// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
  char found = 0;
  char index = 0;
  char len;

  len = strlen(str);

  if (strlen(sfind) > len) {
    return 0;
  }
  while (index < len) {
    if (str[index] == sfind[found]) {
      found++;
      if (strlen(sfind) == found) {
        return 1;
      }
    }
    else {
      found = 0;
    }
    index++;
  }

  return 0;
}