Arduino Ethernet W5100 and Servo Motor


we have a test of Arduino, this time we are conducting a test of the W5100 Ethernet module, which has the ability to connect our Arduino projects to the Internet and our local area networks (LAN).

wan servo motor

What should you keep in mind to control a servo motor with an Arduino Ethernet W5100 ?

The next test is to connect a servo motor to the Arduino Mega 2560 board and control it through an Ethernet communication  with W5100 module, in this module we will set up a small web server and through it we will turn 90 degrees a servo motor from Local website hosted on that server.

For this test the following items are required:

1 Arduino Mega 2560 Card or Arduino Uno.

2 Ethernet Module w5100

3 Servo Motor

4 Direct UTP Patch cord to connect the module to the LAN

5. Adapter 6-9 VDC (Required in some cases for the servo current )

Here is the wiring diagram of the servo motor, Arduino Mega 2560 and W5100 module:

Arduino-board wan

The control wire of servo motor (yellow wire) should be on pin 7 and the LED should be connected to pin 5, the servo motor is connected to the voltage source of the mega card 2560 with its red and black wires 5V and 0V (GND ) respectively.

The code to be loaded on the Mega 2560 development board, is in my GitHub repository.

//// Servo control a traves del modulo W5100
#include <SPI.h>
#include <Ethernet.h>
#include <Servo.h>
Servo myservo; // create servo object to control a servo
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 0, 14 }; // ip in lan
byte gateway[] = { 192, 168, 0, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //server port
String readString;
void setup(){
pinMode(5, OUTPUT); //pin selected to control
myservo.attach(7); //the pin for the servo control
//start Ethernet
Ethernet.begin(mac, ip);
//enable serial data print
Serial.println(“server servo/pin 5 test 1.0”); // so I can keep track of what is loaded
void loop(){
// Create a client connection
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c =;
//read char by char HTTP request
if (readString.length() < 100) {
//store characters to string
readString += c;
//if HTTP request has ended
if (c == ‘\n’) {
Serial.println(readString); //print to serial monitor for debuging
client.println(“HTTP/1.1 200 OK”); //send new page
client.println(“Content-Type: text/html”);
client.println(“<TITLE>Arduino Servo WEB</TITLE>”);
client.println(“<H1>Link para controlar un servo</H1>”);
client.println(“<a href=\”/?on\”\”>IZQUIERDA</a>”);
client.println(“<a href=\”/?off\”\”>DERECHA</a>”);
//stopping client
///////////////////// control arduino pin
if(readString.indexOf(“?on”) >0)//checks for on
digitalWrite(5, HIGH); // set pin 4 high
Serial.println(“Led On”);
if(readString.indexOf(“?off”) >0)//checks for off
digitalWrite(5, LOW); // set pin 4 low
Serial.println(“Led Off”);
//clearing string for next read


Is important chech the IP address of your modem from the windows console and with this IP address asign an address to w5100 module into LAN range to communicate properly .

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