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  • Blynk is a platform with iOS and Android apps to control
  • Arduino, Raspberry Pi and the likes over the Internet.
  • You can easily build graphic interfaces for all your
  • projects by simply dragging and dropping widgets.
  • Downloads, docs, tutorials:
  • Blynk community:
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  • Blynk library is licensed under MIT license
  • This example code is in public domain.

  • This example shows how to configure static IP with Ethernet.
  • Be sure to check ordinary Ethernet example first!!!
  • NOTE: Pins 10, 11, 12 and 13 are reserved for Ethernet module.
  •   DON'T use them in your sketch directly!
  • WARNING: If you have an SD card, you may need to disable it
  •   by setting pin 4 to HIGH. Read more here:


#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <SPI.h>
#include <Ethernet.h>
#include <BlynkSimpleEthernet.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = “dff11b0619a8481ab08ed02a9ae4289b”;

IPAddress server_ip (10, 0, 0, 10);

// Mac address should be different for each device in your LAN
byte arduino_mac[] = { 0xDE, 0xED, 0xBA, 0xFE, 0xBE, 0xED };
IPAddress arduino_ip ( 192, 168, 0, 106);
IPAddress dns_ip ( 192, 168, 0, 1);
IPAddress gateway_ip ( 192, 168, 0, 1);
IPAddress subnet_mask(255, 255, 255, 0);

#define W5100_CS 10
#define SDCARD_CS 4

void setup()
digitalWrite(SDCARD_CS, HIGH); // Deselect the SD card

//Blynk.begin(auth, server_ip, 8442, arduino_ip, dns_ip, gateway_ip, subnet_mask, arduino_mac);
// Or like this:
Blynk.begin(auth, “”, 8442, arduino_ip, dns_ip, gateway_ip, subnet_mask, arduino_mac);

void loop()


Please user formatting for your code.

@krishna looks like you are using the standard Arduino_Ethernet_Manual.ino sketch provided by Blynk.

Serial Monitor will show exactly what you have if one of your wires is not connected correctly i.e. it allocates an IP but will not function as an Ethernet connection. Worth checking the wires.