Virtual pins

Projects Programming
2

Please post a complete sketch

Have you looked at the Blynk examples such as VirtualPinRead ?

#define BLYNK_PRINT Serial

#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[] = "YourAuthToken";

// This function will be called every time Slider Widget
// in Blynk app writes values to the Virtual Pin V1
BLYNK_WRITE(V1)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable

  // process received value
}

void setup()
{
  // Debug console
  Serial.begin(9600);

  Blynk.begin(auth);
}

void loop()
{
  Blynk.run();
}