Ethernet
This is a library for Ethernet initialization. Specify #include <Ethernet.h> for use.
begin
- Description
- Initializes the Ethernet library and network settings. The DHCP automatically obtains an IP address, DNS, default gateway, and subnet mask.
- Syntax
-
int Ethernet.begin(mac)
Ethernet.begin(mac, ip)
Ethernet.begin(mac, ip, dns)
Ethernet.begin(mac, ip, dns, gateway)
Ethernet.begin(mac, ip, dns, gateway, subnet) - Parameters
- mac: MAC address (array of 6 bytes)
ip: IP address (array of 4 bytes)
dns: Name server address (array of 4 bytes)
gateway: Default gateway address (array of 4 bytes)
subnet: Subnet mask (array of 4 bytes) - Returns
- If Ethernet.begin(mac) is successful = 1; if failure = 0. Others are none.
localIP
- Description
- Obtains the IP address of the board.
- Syntax
- IPAddress Ethernet.localIP()
- Parameters
- None
- Returns
- The IP address
Sample Program
Connect with DHCP, and then display the IP address.
#include <Arduino.h>
#include <Ethernet.h>
byte mac[] = {
0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02 };
// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;
void setup()
{
Serial.begin(9600);
Serial.println("Start to connect..");
// start the Ethernet connection:
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
while(1);
}
// print your local IP address:
Serial.println(Ethernet.localIP());
}
void loop() {
}