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131 lines
3.8 KiB
131 lines
3.8 KiB
/*
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Repeating Web client
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This sketch connects to a a web server and makes a request
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using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
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the Adafruit Ethernet shield, either one will work, as long as it's got
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a Wiznet Ethernet module on board.
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This example uses DNS, by assigning the Ethernet client with a MAC address,
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IP address, and DNS address.
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Circuit:
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* Ethernet shield attached to pins 10, 11, 12, 13
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created 19 Apr 2012
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by Tom Igoe
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modified 21 Jan 2014
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by Federico Vanzati
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http://www.arduino.cc/en/Tutorial/WebClientRepeating
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This code is in the public domain.
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*/
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#include <SPI.h>
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#include <Ethernet.h>
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// assign a MAC address for the ethernet controller.
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// fill in your address here:
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byte mac[] = {
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0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
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};
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// Set the static IP address to use if the DHCP fails to assign
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IPAddress ip(192, 168, 0, 177);
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IPAddress myDns(192, 168, 0, 1);
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// initialize the library instance:
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EthernetClient client;
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char server[] = "www.arduino.cc"; // also change the Host line in httpRequest()
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//IPAddress server(64,131,82,241);
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unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds
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const unsigned long postingInterval = 10*1000; // delay between updates, in milliseconds
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void setup() {
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// You can use Ethernet.init(pin) to configure the CS pin
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//Ethernet.init(10); // Most Arduino shields
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//Ethernet.init(5); // MKR ETH shield
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//Ethernet.init(0); // Teensy 2.0
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//Ethernet.init(20); // Teensy++ 2.0
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//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
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//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
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// start serial port:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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// start the Ethernet connection:
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Serial.println("Initialize Ethernet with DHCP:");
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if (Ethernet.begin(mac) == 0) {
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Serial.println("Failed to configure Ethernet using DHCP");
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// Check for Ethernet hardware present
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if (Ethernet.hardwareStatus() == EthernetNoHardware) {
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Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
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while (true) {
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delay(1); // do nothing, no point running without Ethernet hardware
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}
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}
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if (Ethernet.linkStatus() == LinkOFF) {
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Serial.println("Ethernet cable is not connected.");
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}
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// try to congifure using IP address instead of DHCP:
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Ethernet.begin(mac, ip, myDns);
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Serial.print("My IP address: ");
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Serial.println(Ethernet.localIP());
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} else {
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Serial.print(" DHCP assigned IP ");
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Serial.println(Ethernet.localIP());
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}
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// give the Ethernet shield a second to initialize:
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delay(1000);
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}
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void loop() {
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// if there's incoming data from the net connection.
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// send it out the serial port. This is for debugging
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// purposes only:
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if (client.available()) {
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char c = client.read();
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Serial.write(c);
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}
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// if ten seconds have passed since your last connection,
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// then connect again and send data:
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if (millis() - lastConnectionTime > postingInterval) {
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httpRequest();
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}
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}
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// this method makes a HTTP connection to the server:
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void httpRequest() {
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// close any connection before send a new request.
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// This will free the socket on the WiFi shield
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client.stop();
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// if there's a successful connection:
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if (client.connect(server, 80)) {
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Serial.println("connecting...");
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// send the HTTP GET request:
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client.println("GET /latest.txt HTTP/1.1");
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client.println("Host: www.arduino.cc");
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client.println("User-Agent: arduino-ethernet");
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client.println("Connection: close");
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client.println();
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// note the time that the connection was made:
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lastConnectionTime = millis();
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} else {
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// if you couldn't make a connection:
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Serial.println("connection failed");
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}
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}
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