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- #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;
- }
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