On this illustration we will going to wire the Ethernet Shield W5100, This shield allows an Arduino Board to connect to the internet. This shield is based on W5100 WIZNET Chip, a network stack capable of both TCP and UDP. The Arduino Ethernet Shield supports up to four simultaneous socket connection.
This shield has a micro-SD card slot, which can be used to store files for serving over the network. It is also compatible with the Arduino Mega, Leonardo and UNO using the Ethernet library. You can access the on-board SD card slot using the SD library which is included in the current Arduino build.
This board has also a reset controller to ensure that the W5100 Ethernet module is properly reset on power-up. The reset button on the shield resets both the W5100 and the Arduino board.
The Arduino communicates with both the W5100 and the micro SD card using SPI (Serial Peripheral Interface) through the ICSP (In-Circuit Serial Programming) header, located on digital pin 11, 12 and 13 on UNO/LEO/Duemilanove, pin 50, 51, and 52 on the MEGA. On both boards pin 10 us used to select the W5100 and pin 4 for the micro SD card. These pins cannot be used for general IO (Input Output). On the MEGA the hardware SS pin, 53 is not used to select either the W5100 or the SD card, but it must be kept as an output or the SPI interface cannot be used.
Note: The W5100 Shield and SD card share the SPI bus, only one can be active at the time. If you are using both peripherals in your program, this should be taken care of by the corresponding libraries. If you’re not using one of the peripherals in your program, however, you’ll need to explicitly deselect it. To do this with the SD card, set pin 4 as an output and write a HIGH to it. For the W5100, set digital pin10 as a HIGH output.
MAC address: 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
Byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
Required Component
Arduino UNO/ MEGA/LEONARDO/DUE
1x Ethernet Shield W5100
1x Resistor 220 k Ohms
1x LED ( Any color ) as Ouput
Solder Less Bread Board
Jumper Wires
Optional Components
2, or 4 channel Relay 5v Module with Isolator/Optocoupler
Wiring Diagram
This Ethernet shiled library does not come with DNS support out of the box meaning we cannot used to access the website we need by its simple URL (like http://www.14core.com). We need to have access the site though an IP address. For instance 192.168.10.100, 200,188,122,145 and you can actually access.
Arduino Sketch Code for Server
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/*__________________________________________________________ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ 14CORE.com ARDUINO ETHERNET SHIELD TEST CODE $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ {{{ SERVER }}} Arduino Digital Pin 2 ____________________________________________________________ */ #include <Ethernet.h> #include <SPI.h> boolean reading = false; //byte ip[] = { 192, 168, 10, 101 }; //If you want to used anual setup for the IP //byte gateway[] = { 192, 168, 10, 1 }; //If you want to used anual setup for the Gateway //byte subnet[] = { 255, 255, 255, 0 }; //If you want to used anual setup for Subnetmask // if need to change the MAC address (This is very rare) byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; EthernetServer server = EthernetServer(80); //port 80 void setup(){ Serial.begin(9600); //Pins 10,11,12 & 13 are used by the ethernet shield pinMode(2, OUTPUT); //pinMode(3, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(4, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(5, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(6, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(7, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(8, OUTPUT); // Usable if you want to connect other LED or Devices //pinMode(9, OUTPUT); // Usable if you want to connect other LED or Devices Ethernet.begin(mac); //Ethernet.begin(mac, ip, gateway, subnet); //if you want to used manual setup only server.begin(); Serial.println(Ethernet.localIP()); } void loop(){ checkForClient(); //listen for incoming clients, and process qequest. } void checkForClient(){ EthernetClient client = server.available(); if (client) { boolean currentLineIsBlank = true; //http request ends with a blank line boolean sentHeader = false; while (client.connected()) { if (client.available()) { if(!sentHeader){ // send a standard http response header client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(); sentHeader = true; } char c = client.read(); if(reading && c == ' ') reading = false; if(c == '?') reading = true; //found the ?, begin reading the info if(reading){ Serial.print(c); switch (c) { case '2': //add code here to trigger on 2 triggerPin(2, client); break; /* case '3': //add code here to trigger on 3 triggerPin(3, client); break; case '4': //add code here to trigger on 4 triggerPin(4, client); break; case '5': //add code here to trigger on 5 triggerPin(5, client); break; case '6': //add code here to trigger on 6 triggerPin(6, client); break; case '7': //add code here to trigger on 7 triggerPin(7, client); break; case '8': //add code here to trigger on 8 triggerPin(8, client); break; case '9': //add code here to trigger on 9 triggerPin(9, client); break; */ } } if (c == '\n' && currentLineIsBlank) break; if (c == '\n') { currentLineIsBlank = true; }else if (c != '\r') { currentLineIsBlank = false; } } } delay(1); // Delay for the web browser time to receive the data client.stop(); //To close the connection: } } void triggerPin(int pin, EthernetClient client){ client.print(" > Switch On "); //Client needed just for HTML output purposes. client.println(pin); client.print("<br>"); digitalWrite(pin, HIGH); delay(25); digitalWrite(pin, LOW); delay(25); } |
Arduino Sketch Code for Client
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/*__________________________________________________________ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ 14CORE.com ARDUINO ETHERNET SHIELD TEST CODE ((((( CLIENT ))))) $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ ____________________________________________________________ */ #include <Ethernet.h> #include <SPI.h> /hsphere/local/home/bogetved/brygging.bogetvedt.com/Scripts/Receive/test.php HTTP/1.0"; byte server[] = { 192,168,100,100 }; //The ip Address of the server you will going to connect //location to go to on the server //Note you need to make sure to keep HTTP/1.0 at the end, this is telling it what type of file it is. String location = "/~14core/testcode/ethernet/iotcontroller.php HTTP/1.0"; // String location = "localhost/home/scripts/test.php HTTP/1.0"; // String location = "192.168.10.100/home/controller.php HTTP/1.0"; // If you going to change the MAC address (Very Rare) byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; EthernetClient client; char inString[32]; // The string for incoming serial data int stringPos = 0; // The string index counter boolean startRead = false; // Reading? void setup(){ Ethernet.begin(mac); Serial.begin(9600); } void loop(){ String pageValue = connectAndRead(); //connect to the server and read the output Serial.println(pageValue); //print out the findings. delay(5000); //Delay 5 seconds before connecting again. } String connectAndRead(){ //connect to the server Serial.println("connecting..."); //port 80 is typical of a www page if (client.connect(server, 80)) { Serial.println("Connected..."); client.print("GET"); client.println(location); client.println(); //Connected - Read the page return readPage(); //go and read the output }else{ return "Connection is failed..."; } } String readPage(){ //To read the page, and capture & return everything between '<' and '>' stringPos = 0; memset( &inString, 0, 32 ); //clear inString memory while(true){ if (client.available()) { char c = client.read(); if (c == '<' ) { //The begining of the character '<' startRead = true; //Start reading the part }else if(startRead){ if(c != '>'){ //The ending '>' character inString[stringPos] = c; stringPos ++; }else{ //Disconnecting startRead = false; client.stop(); client.flush(); Serial.println("Shutting Off..."); return inString; } } } } } |
The example php file. this is just creates a random alpha-numeric string.
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<?php //Arduino will store anything between '<' and '>' string //So if the output was <14CORE1234> - The Arduino would read 14CORE1234 //Generates a random alphanumeric string $what_the_arduino_reads = '1'.base_convert(rand(10000,7777777), 10, 36); echo '<'.$what_the_arduino_reads.'>'; ?> |
Download other sample code here | Zip
Download the Ethernet Shield Schematics here | Pdf
Download the W5100 Datasheet here | Pdf
