ajfisher/networked_temperature_sensor.pde

## networked_temperature_sensor.pde
/**

  Basic Networked temperature sensor.

  Displays a web page with the temperature on it.

  Author: Andrew Fisher
  Date: 30 September 2011

  Version 0.1

  Adapted from generic web server example as art of IDE created by David Mellis and Tom Igoe.

  Circuit: Ethernet shield or other ethenet enabled Arduino on pins 10,11,12,13

  +5v --------- 10K Thermistor ---------- 10K Resistor ------- GND
                                    |
                                    |
                                    |
                                 Arduino Analog 0

   This work is in the public domain, as was the original work by Mellis and Igoe above.

**/

#include <SPI.h>
#include <Ethernet.h>

#define TEMP_SENSOR 0

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = { 0x06, 0xB1, 0xF9, 0xC1, 0xE2, 0x38 };
byte ip[] = { 10,16,0,33 };
byte gateway[] = {10,16,0,1};
byte subnet[] = {255,255,128,0};

// initialise the web server
Server server(80);

float current_temp = 0;

void setup() {

  Ethernet.begin(mac, ip, gateway, subnet);
  server.begin();
}


void loop() {

  current_temp = get_temp();

  // listen for incoming clients
  Client client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header

          send_response(client);

          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
  }
}

float get_temp() {
  // get the sensor val and use Steinhart-Hart approximation
  // to get the temperature

  float THERMR = 10000;
  float PAD = 10000;

  int rawval = analogRead(TEMP_SENSOR);
  long Resistance=((1024 * THERMR / rawval) - PAD);
  float Temp = log(Resistance); // Saving the Log(resistance) so not to calculate  it 4 times later
  Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp));
  Temp = Temp - 273.15;  // Convert Kelvin to Celsius

  return(Temp);

}

void send_response(Client client) {
  // this function simply sends the response including relevant html as well
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println();


  client.println("<!doctype html>");
  client.println("<html><head><title>Arduino - Current Temperature</title>");
  client.println("<link href='http://fonts.googleapis.com/css?family=Rokkitt:400,700' rel='stylesheet' type='text/css'>");
  client.println("<link href='http://ajfisher.me/wds/temp.css' rel='stylesheet' type='text/css'>");
  client.println("</head><body>");
  client.println("<div class=\"temperature\">");
  client.println("<h1>Current Temperature:</h1>");
  client.print("<p><span id=\"temp\">");
  client.print(current_temp);
  client.println("</span><sup id=\"deg\">&deg;C</sup></p>");
  client.println("<h2>Design / CSS thanks to <a href=\"http://twitter.com/superhighfives\">superhighfives</a></2></p>");
  client.println("</div></body></html>");

}
	/**

	Basic Networked temperature sensor.

	Displays a web page with the temperature on it.

	Author: Andrew Fisher
	Date: 30 September 2011

	Version 0.1

	Adapted from generic web server example as art of IDE created by David Mellis and Tom Igoe.

	Circuit: Ethernet shield or other ethenet enabled Arduino on pins 10,11,12,13

	+5v --------- 10K Thermistor ---------- 10K Resistor ------- GND
	\|
	\|
	\|
	Arduino Analog 0

	This work is in the public domain, as was the original work by Mellis and Igoe above.

	**/

	#include <SPI.h>
	#include <Ethernet.h>

	#define TEMP_SENSOR 0

	// Enter a MAC address and IP address for your controller below.
	// The IP address will be dependent on your local network:
	byte mac[] = { 0x06, 0xB1, 0xF9, 0xC1, 0xE2, 0x38 };
	byte ip[] = { 10,16,0,33 };
	byte gateway[] = {10,16,0,1};
	byte subnet[] = {255,255,128,0};

	// initialise the web server
	Server server(80);

	float current_temp = 0;

	void setup() {

	Ethernet.begin(mac, ip, gateway, subnet);
	server.begin();
	}


	void loop() {

	current_temp = get_temp();

	// listen for incoming clients
	Client client = server.available();
	if (client) {
	// an http request ends with a blank line
	boolean currentLineIsBlank = true;
	while (client.connected()) {
	if (client.available()) {
	char c = client.read();
	// if you've gotten to the end of the line (received a newline
	// character) and the line is blank, the http request has ended,
	// so you can send a reply
	if (c == '\n' && currentLineIsBlank) {
	// send a standard http response header

	send_response(client);

	break;
	}
	if (c == '\n') {
	// you're starting a new line
	currentLineIsBlank = true;
	}
	else if (c != '\r') {
	// you've gotten a character on the current line
	currentLineIsBlank = false;
	}
	}
	}
	// give the web browser time to receive the data
	delay(1);
	// close the connection:
	client.stop();
	}
	}

	float get_temp() {
	// get the sensor val and use Steinhart-Hart approximation
	// to get the temperature

	float THERMR = 10000;
	float PAD = 10000;

	int rawval = analogRead(TEMP_SENSOR);
	long Resistance=((1024 * THERMR / rawval) - PAD);
	float Temp = log(Resistance); // Saving the Log(resistance) so not to calculate it 4 times later
	Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp));
	Temp = Temp - 273.15; // Convert Kelvin to Celsius

	return(Temp);

	}

	void send_response(Client client) {
	// this function simply sends the response including relevant html as well
	client.println("HTTP/1.1 200 OK");
	client.println("Content-Type: text/html");
	client.println();


	client.println("<!doctype html>");
	client.println("<html><head><title>Arduino - Current Temperature</title>");
	client.println("<link href='http://fonts.googleapis.com/css?family=Rokkitt:400,700' rel='stylesheet' type='text/css'>");
	client.println("<link href='http://ajfisher.me/wds/temp.css' rel='stylesheet' type='text/css'>");
	client.println("</head><body>");
	client.println("<div class=\"temperature\">");
	client.println("<h1>Current Temperature:</h1>");
	client.print("<p><span id=\"temp\">");
	client.print(current_temp);
	client.println("</span><sup id=\"deg\">°C</sup></p>");
	client.println("<h2>Design / CSS thanks to <a href=\"http://twitter.com/superhighfives\">superhighfives</a></2></p>");
	client.println("</div></body></html>");

	}