WiFi Web Client Repeating
This example shows you how to make repeated HTTP requests using a WiFi Shield 101 or a MKR1000 board. It connects to http://www.arduino.cc/latest.txt. The content of the page is viewable through your Arduino Software (IDE) Serial Monitor window.
This example is written for a network using WPA encryption. For WEP or WPA, change the Wifi.begin() call accordingly.
Hardware Required
Arduino WiFi Shield 101
Arduino Zero board
or
- MKR1000
Circuit
Digital pin 7 is used as a handshake pin between the WiFi Shield 101 and the board, and should not be used.
You should have access to a 802.11b/g wireless network that connects to the internet for this example. You will need to change the network settings in the sketch to correspond to your particular networks SSID.
For networks using WPA/WPA2 Personal encryption, you need the SSID and password. The shield will not connect to networks using WPA2 Enterprise encryption.
WEP network passwords are hexadecimal strings known as keys. A WEP network can have 4 different keys; each key is assigned a "Key Index" value. For WEP encrypted networks, you need the SSID, the key, and key number.
image developed using Fritzing. For more circuit examples, see the Fritzing project page
In the above image, the Arduino Zero board would be stacked below the WiFi shield.
Code
/*
Repeating WiFi Web Client
This sketch connects to a a web server and makes a request
using an Arduino WiFi shield.
Circuit:
* WiFi shield attached to pins SPI pins and pin 7
created 23 April 2012
modified 31 May 2012
by Tom Igoe
modified 13 Jan 2014
by Federico Vanzati
http://arduino.cc/en/Tutorial/WiFiWebClientRepeating
This code is in the public domain.
*/
#include <SPI.h>
#include <WiFi101.h>
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID; // your network SSID (name)
char pass[] = SECRET_PASS; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0; // your network key Index number (needed only for WEP)
int status = WL_IDLE_STATUS;
// Initialize the WiFi client library
WiFiClient client;
// server address:
char server[] = "example.org";
//IPAddress server(64,131,82,241);
unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10L * 1000L; // delay between updates, in milliseconds
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while (true);
}
// attempt to connect to WiFi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(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:
delay(10000);
}
// you're connected now, so print out the status:
printWiFiStatus();
}
void loop() {
// if there's incoming data from the net connection.
// send it out the serial port. This is for debugging
// purposes only:
while (client.available()) {
char c = client.read();
Serial.write(c);
}
// if ten seconds have passed since your last connection,
// then connect again and send data:
if (millis() - lastConnectionTime > postingInterval) {
httpRequest();
}
}
// this method makes a HTTP connection to the server:
void httpRequest() {
// close any connection before send a new request.
// This will free the socket on the WiFi shield
client.stop();
// if there's a successful connection:
if (client.connect(server, 80)) {
Serial.println("connecting...");
// send the HTTP PUT request:
client.println("GET / HTTP/1.1");
client.println("Host: example.org");
client.println("User-Agent: ArduinoWiFi/1.1");
client.println("Connection: close");
client.println();
// note the time that the connection was made:
lastConnectionTime = millis();
}
else {
// if you couldn't make a connection:
Serial.println("connection failed");
}
}
void printWiFiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}
See Also:
WiFi library - Your reference for the WiFi101 Library.
WiFi Shield - Product details for the WiFi 101 Shield.
MKR1000 - Product details for the MKR1000 board.
Connect No Encryption - Demonstrates how to connect to an open network.
Connect With WEP - Demonstrates how to connect to a network that is encrypted with WEP.
Connect With WPA - Demonstrates how to connect to a network that is encrypted with WPA2 Personal.
Scan Networks - Displays all WiFi networks in range.
Simple Web Server WiFi - Turn on and off an LED accessing this simple Web Server.
UDP NTP Client - Query a Network Time Protocol (NTP) server using UDP.
WiFi Chat Server - Set up a simple chat server.
WiFi Web Client - Connect to a remote webserver.
WiFi Web Server - Serve a webpage from the WiFi shield with Analog Input values.
WiFi Send Receive UDP String - Send and receive a UDP string.
Last revision 2016/04/17 by SM