How can I use the dht11 sensor here?
#include <SPI.h>
#include <Ethernet.h>
#include <SD.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, 1, 120); // 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[2] = {0}; // stores the states of the LEDs
void setup()
{
// 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
pinMode(2, INPUT);
pinMode(3, INPUT);
// LEDs
pinMode(6, OUTPUT);
pinMode(7, 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)
// read buttons and debounce
ButtonDebounce();
}
// function reads the push button switch states, debounces and latches the LED states
// toggles the LED states on each push - release cycle
// hard coded to debounce two switches on pins 2 and 3; and two LEDs on pins 6 and 7
// function adapted from Arduino IDE built-in example:
// File --> Examples --> 02.Digital --> Debounce
void ButtonDebounce(void)
{
static byte buttonState[2] = {LOW, LOW}; // the current reading from the input pin
static byte lastButtonState[2] = {LOW, LOW}; // the previous reading from the input pin
// the following variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
static long lastDebounceTime[2] = {0}; // the last time the output pin was toggled
long debounceDelay = 50; // the debounce time; increase if the output flickers
byte reading[2];
reading[0] = digitalRead(2);
reading[1] = digitalRead(3);
for (int i = 0; i < 2; i++) {
if (reading[i] != lastButtonState[i]) {
// reset the debouncing timer
lastDebounceTime[i] = millis();
}
if ((millis() - lastDebounceTime[i]) > debounceDelay) {
// whatever the reading is at, it's been there for longer
// than the debounce delay, so take it as the actual current state:
// if the button state has changed:
if (reading[i] != buttonState[i]) {
buttonState[i] = reading[i];
// only toggle the LED if the new button state is HIGH
if (buttonState[i] == HIGH) {
LED_state[i] = !LED_state[i];
}
}
}
} // end for() loop
// set the LEDs
digitalWrite(6, LED_state[0]);
digitalWrite(7, LED_state[1]);
// save the reading. Next time through the loop,
// it'll be the lastButtonState:
lastButtonState[0] = reading[0];
lastButtonState[1] = reading[1];
}
// 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
digitalWrite(7, HIGH);
}
else if (StrContains(HTTP_req, "LED2=0")) {
LED_state[1] = 0; // save LED state
digitalWrite(7, 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}; // pins interfaced to switches
cl.print("<?xml version = \"1.0\" ?>");
cl.print("<inputs>");
// checkbox LED states
// LED1
cl.print("<LED>");
if (LED_state[0]) {
cl.print("checked");
}
else {
cl.print("unchecked");
}
cl.println("</LED>");
// button LED states
// LED3
cl.print("<LED>");
if (LED_state[1]) {
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;
}