Problem in interfacing a servo motor with an arduino wifi shield

I have connected a servo motor with my arduino Wifi shield over a wifi network and trying to control it wirelessly by sending HTTP request to the Shield from the local IP assigned to the shield by the network. I hv used the SimpleWebServerWifi example of the wifi library using the WPA wifi encryption.
But the problem is as I m trying to send the request to the shield, the wifi shield accepts the request executes the instructions of the servo and simultaneously the link gets disconnected. Every time I have to reset the shield for sending requests to control my servo motor.

Is there any solution to this ??????

Is there any solution to this ???

Not unless you post your code.

Please use the code button </>

so that it looks like this


#include <SPI.h>
#include <WiFi.h>
#include <Servo.h>
Servo myservo;
int Pos = 90;
int RightPos = 135;
int LeftPos = 45;

char ssid = “MBLAZE Abhinaba-EC315-8645”; // your network SSID (name)
char pass = “c804anbh”;
int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
WiFiServer server(80);

void setup() {
Serial.begin(9600); // initialize serial communication
// pinMode(9, OUTPUT); // set the LED pin mode
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println(“WiFi shield not present”);
while (true); // don’t continue

String fv = WiFi.firmwareVersion();
if ( fv != “1.1.0” )
Serial.println(“Please upgrade the firmware”);

// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to Network named: ");
Serial.println(ssid); // print the network name (SSID);

// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
server.begin(); // start the web server on port 80
printWifiStatus(); // you’re connected now, so print out the status

void loop() {
WiFiClient client = server.available(); // listen for incoming clients

if (client) { // if you get a client,
Serial.println(“new client”); // print a message out the serial port
String currentLine = “”; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client’s connected
if (client.available()) { // if there’s bytes to read from the client,
char c =; // read a byte, then
Serial.write(c); // print it out the serial monitor
if (c == ‘\n’) { // if the byte is a newline character

// if the current line is blank, you got two newline characters in a row.
// that’s the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what’s coming, then a blank line:
client.println(“HTTP/1.1 200 OK”);

// the content of the HTTP response follows the header:
client.print(“Click <a href=”/H">here turn the servo right
client.print(“Click <a href=”/L”>here turn the servo left

// The HTTP response ends with another blank line:
// break out of the while loop:
else { // if you got a newline, then clear currentLine:
currentLine = “”;
else if (c != ‘\r’) { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine

// Check to see if the client request was “GET /H” or “GET /L”:
if (currentLine.endsWith(“GET /H”)) {
myservo.write(RightPos); // GET /H turns the servo to the right
if (currentLine.endsWith(“GET /L”)) {
myservo.write(LeftPos); // GET /L turns the servo to the left
// close the connection:
Serial.println(“client disonnected”);

void printWifiStatus() {
// print the SSID of the network you’re attached to:
Serial.print("SSID: ");

// print your WiFi shield’s IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");

// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print(“signal strength (RSSI):”);
Serial.println(" dBm");
// print where to go in a browser:
Serial.print(“To see this page in action, open a browser to http://”);

What part of "Please use the code button </> " did you not understand ?


when I connect the servo motor to the PWM pin of the Wifi shield ... I lose the Connection of the shield with the network....

How are you powering the servo?

when I connect the servo motor to the PWM pin of the Wifi shield ... I lose the Connection of the shield with the network....

Is there any particular reason why you are using a PWM pin ?
The PWM pins are only specifically needed if you use analogWrite() and that is not how you control servos.


It does sound like you have failed to power the servo separately and thus the servo
puts spikes/dips on the power rail and crashes the wifi shield.

Never power a motor, relay or servo from a logic supply, that's like letting cattle into the
living room and expecting the carpet to stay clean!