Ethernet and LM35 temperature sensor
/*
Autor: Ángel Barquín Fecha: 05-02-2015
Programa: ethernet mas temperatura Versión: 1.0
Dispositivo: ATMEL 328 Compilador: AVR
Entorno ID: 1.5.5-r2 Simulador: VSM
Tarjeta de aplicación: Arduino
*/
///////////////////////////////////////////////////////////////////
// The program measures medianto the environmental temperature sensor LM35.
// Here we use our Arduino Uno to create a server on the network,
// And provide the measured value with the sensor. Also included is notice
// If the temperature rises above 24 degrees Celsius.
// Arduino 1 has -Aref = Aref = GND and + 5V.
// So we can not measure negative temperatures.
///////////////////////////////////////////////////////////////////
// Libraries included
#include <SPI.h>
#include <Ethernet.h>
// We define variables temperature
int temp;
int valorLeido;
// Initializes the HTTP server on port 80 and the Mac and manually enter the IP
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(172, 100, 4, 177);
EthernetServer server(80); //creating an object of class ethernetServer.
void setup()
{
Serial.begin(9600);
while (!Serial)
{
// wait for serial port to connect. Needed for Leonardo only
}
Ethernet.begin(mac, ip);//ethernet connection initialization
server.begin();
Serial.print("the server's ip: ");
Serial.println(Ethernet.localIP());
analogReference(INTERNAL);
}
void loop()
{
valorLeido=analogRead(4);//Read the value of the analog pin specified. This means to be assigned
// Input voltages between 0 and 5 volts in integer values between 0 and 1023
// 100 microseconds (0.0001 s) it takes to read an analog input,
// so the maximum reading rate is about 10,000 times per second.
temp= (valorLeido*1.1*100)/1023;
// listen until a connected client.
EthernetClient client = server.available();
if (client)
{
Serial.println("new customer");
Serial.println();
// http request must end with a blank line.
boolean currentLineIsBlank = true;
while (client.connected())
{
if (client.available())
{
char c = client.read();//We read the petition.
Serial.write(c);//the request is shown by the serial.
if (c == '\n' && currentLineIsBlank)//we see that what we have received is a request.
{
// send a standard http header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); //the connection is closed after completion of the answer
client.println("Refresh: 1"); // the page is refreshed every 1 second.
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("<h2>");
client.print("<h2 align=center>The measured temperature is displayed with an LM35 sensor<h2>");
client.print("<h2>");
client.print("<br />");
client.println("<center>");
client.print("<h6>");
client.print("Ambient temperature: ");
client.print("<br />");
client.println(temp);
client.println("degrees Celsius");
client.print("<h6>");
client.println("<center>");
if(temp>26 && temp<28)// if the temperature is between 26 and 28 degrees can see a //picture we warn
{
client.println("<body bgcolor=yellow>");
client.print("<img src=https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcScZQcjwfFrrVwDI1V0jcRscC7fZTEqXpNYE93FLXutlfKN5CsE>");
}
if(temp<=26 && temp>0)
{
client.println("<body bgcolor=blue>");
client.print("<img src=http://aventalearning.com/content168staging/foreignlanguage/spanish1a/images/niceweather.GIF>");
}
if(temp>=28)// if the temperature is under 26 degrees
// show one image that reflects cold
{
client.println("<body bgcolor=red>");
client.println("<center>");
client.print("<br />");
client.print("<h2>");
client.print("The temperature is too high");
client.print("<h2>");
client.println("<center>");
client.print("<img src=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7pit7HUeYuIdlJMfHAzODDzivw3wV13jNstiNsFkI3xLVnn9gaURkks655PUrOcVvrwYC0TeuVlfWIcRqVs3ggdKL3MXkPywMJBn8AGVyEa4Ow_nxq36n9bx0obdipKW4yNimY1G7nVE/s1600/hot.gif>");
}
client.println("<br />");
client.println("</html>");
break;//once we sent the data back to check clients making requests
}
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);
client.stop();// close connection
Serial.println("This is the request received");
Serial.println("------------------------");
Serial.println("Customer offline");
Serial.println("-------------------------------");
}
}
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