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