Basic Library
Digital I/O
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Time
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Interrupts
Serial Comm.
Standard Library
Servo Motor
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Liquid Crystal
EEPROM
SPI
I2C (Wire)
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Ethernet
Ethernet (Server)
Ethernet (Client)
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SoftwareSerial
Utility
Ethernet
This is a library for Ethernet initialization. Initialization is necessary for both client and server. Connect with the Arduino shield and ioShield equipped with WIZnet's WIZ550io and control by SPI. Specify #include <SPI.h>
and #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()
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
maintain
- Description
- Allows for the renewal of DHCP leases.
- Syntax
- Ethernet.maintain()
- Parameters
- None
- Returns
- 0: Nothing happened
1: Renew failed
2: Renew success
3: Rebind fail
4: Rebind success
Sample Program
Connect with DHCP, and then display the IP address.
#include <Arduino.h>
#include <SPI.h>
#include <Ethernet.h>
void setup()
{
Serial.begin(9600);
// start the Ethernet connection:
if (Ethernet.begin() == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
while(1);
}
// print your local IP address:
Serial.println(Ethernet.localIP());
}
void loop() {
}