Creating Server using Ethernet
Point to be noted
- If router allocates dynamic IP then use it in the browser to fetch the page from served by the Arduino ( Dynamic IP address you can find in Serial Monitor)
- Upload your program before inserting the Ethernet Shield to the Arduion Board
Connections
Code
#include <SPI.h> #include <Ethernet.h> // Enter a MAC address and IP address for your controller below. // The IP address will be dependent on your local network: byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDA, 0x02 }; // Set the static IP address to use if the DHCP fails to assign IPAddress ip(192, 168, 1, 10); // Initialize the Ethernet server library // with the IP address and port you want to use // (port 80 is default for HTTP): EthernetServer server(80); void setup() { //pinMode(2, INPUT); Serial.begin(9600); // start the Ethernet connection and the server: if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); // no point in carrying on, so do nothing forevermore: // try to congifure using IP address instead of DHCP: Ethernet.begin(mac, ip); } Serial.println("IP address given below:"); delay (1000); Serial.println(Ethernet.localIP()); server.begin(); } void loop() { // listen for incoming clients EthernetClient 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 client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(); client.println("<cke:html><cke:body><center><h1>Hi!! I am your IOT</h1>"); client.println("</center></cke:body></cke:html>"); 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(); } }
Creating simple web client – requesting www.google.com from arduino
/* Web client This sketch connects to a website (http://www.google.com) using an Arduino Wiznet Ethernet shield. Circuit: * Ethernet shield attached to pins 10, 11, 12, 13 created 18 Dec 2009 by David A. Mellis modified 9 Apr 2012 by Tom Igoe, based on work by Adrian McEwen */ #include <SPI.h> #include <Ethernet.h> // Enter a MAC address for your controller below. // Newer Ethernet shields have a MAC address printed on a sticker on the shield byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // if you don't want to use DNS (and reduce your sketch size) // use the numeric IP instead of the name for the server: //IPAddress server(74,125,232,128); // numeric IP for Google (no DNS) char server[] = "www.google.com"; // name address for Google (using DNS) // Set the static IP address to use if the DHCP fails to assign IPAddress ip(192, 168, 1, 17); // Initialize the Ethernet client library // with the IP address and port of the server // that you want to connect to (port 80 is default for HTTP): EthernetClient client; void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for native USB port only } // start the Ethernet connection: if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); // try to congifure using IP address instead of DHCP: Ethernet.begin(mac, ip); } // give the Ethernet shield a second to initialize: delay(1000); Serial.println("connecting..."); // if you get a connection, report back via serial: if (client.connect(server, 80)) { Serial.println("connected"); // Make a HTTP request: client.println("GET /search?q=arduino HTTP/1.1"); client.println("Host: www.google.com"); client.println("Connection: close"); client.println(); } else { // if you didn't get a connection to the server: Serial.println("connection failed"); } } void loop() { // if there are incoming bytes available // from the server, read them and print them: if (client.available()) { char c = client.read(); Serial.print(c); } // if the server's disconnected, stop the client: if (!client.connected()) { Serial.println(); Serial.println("disconnecting."); client.stop(); // do nothing forevermore: while (true); } }
Output (Program 2)
Sending Arduino data to Web
http://data.sparkfun.com is used to create a stream to store data ( Humidity and Temperature)
#include <Ethernet.h> #include <SPI.h> #include <dht.h> byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x01 }; // RESERVED MAC ADDRESS EthernetClient client; dht DHT; #define DHT11_PIN 5 char s[200]; String data; void setup() { Serial.begin(115200); if (Ethernet.begin(mac) == 0) { Serial.println("Failed to configure Ethernet using DHCP"); } Serial.println(); Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)"); } void loop() { // READ DATA Serial.print("DHT11, \t"); int chk = DHT.read11(DHT11_PIN); // DISPLAY DATA Serial.print(DHT.humidity, 1); Serial.print(",\t"); Serial.println(DHT.temperature, 1); int h=DHT.humidity; int t1 = DHT.temperature; float f2 = DHT.temperature-t1; int t2 = trunc(f2 * 10000); if (client.connect("data.sparkfun.com",80)) { // REPLACE WITH YOUR SERVER ADDRESS sprintf (s, "POST /input/EJO18W4KDYf2vodvrdpq?private_key=dqPGNEnVkoSwqRDqNDlr&humidity=%d&temperature=%d.%04d HTTP/1.0\r\n\r\n Host: data.sparkfun.com\r\n\r\n",h,t1,t2); client.println(s); Serial.println(s); client.println("Content-Type: application/x-www-form-urlencoded"); client.print("Content-Length: "); client.println(data.length()); client.println(); client.print(data); } if (client.connected()) { client.stop(); // DISCONNECT FROM THE SERVER } delay(2000); }
Output