This shows how to add ethernet support to an Arduino using a Wiznet 5100 module, this is similar to the Ethernet shield that is commonly used but this module is a little bit more compact which may be an advantage in some projects. In this example I actually used an Arduino Nano
W5100 is a set of TCP / IP protocol, MAC and PHY in one network chip, with support for direct bus interface, SPI bus.
Features:
- Supports 10/100 Base TX
- Supports half/full duplex operation
- Supports auto-negotiation and auto cross-over detection
- IEEE 802.3/802.3u Compliance
- Operates 3.3V with 5V I/O signal tolerance
- Supports network status indicator LEDs
- Includes Hardware Internet protocols: TCP, IP Ver.4, UDP, ICMP, ARP, PPPoE, IGMP
- Includes Hardware Ethernet protocols: DLC, MAC
- Supports 4 independent connections simultaneously
- Supports MCU bus Interface and SPI Interface
- Supports Direct/Indirect mode bus access
- Supports Socket API for easy application programming
Here is the module, a lot of websites offer these
The module has some status LEDs, these are as follows
- PWR: indicates that the module is powered
- LINK: indicates the presence of a network link and flashes when data is transmitted or received
- FDX: indicates that the network connection is full duplex
- SPD: indicates the presence of a 100 Mb/s network connection (as opposed to 10 Mb/s)
- RX: flashes when data is received
- TX: flashes when data is sent
- COL: flashes when network collisions are detected
When I wired my module up and connected my network cable the first 4 LEDs were lit, the RX/TX will flash when the code example is uploaded to your board
So, the connections required are:
| PIN | Function | Arduino PIN |
| 1 | GND | GND |
| 2 | Vin 5V | +5V |
| 3 | RESET | N/C |
| 4 | SS (Slave Select) | 10 |
| 5 | SCK (SPI Interface) | 13 |
| 6 | MOSI (SPI Interface) | 11 |
| 7 | MISO (SPI Interface) | 12 |
| 8,9,10 | No Connection | N/C |
Code
This uses an example from the Ethernet library -> WebServer. You can just run that – here it is for reference.
/*
Web Server
A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe
*/
#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[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 0, 177);
// 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() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
// 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("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("<br />");
}
client.println("</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();
Serial.println("client disconnected");
}
}Testing
Using your favourite web browser navigate to the address you setup in the code, in this case http://192.168.0.177.
I saw the following on the webpage
analog input 0 is 307
analog input 1 is 287
analog input 2 is 340
analog input 3 is 301
analog input 4 is 280
analog input 5 is 279
Links
