#define BLYNK_PRINT Serial


#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

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

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "SSID";
char pass[] = "PASS";

int prevState = -1;
int currState = -1;
long lastChangeTime = 0;

void checkPin()
{
  // Invert state, since button is "Active LOW"
  int state = !digitalRead(2);

  // Debounce mechanism
  long t = millis();
  if (state != prevState) {
    lastChangeTime = t;
  }
  if (t - lastChangeTime > 50) {
    if (state != currState) {
      currState = state;
      Blynk.virtualWrite(V1, state);
    }
  }
  prevState = state;
}

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

  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 8442);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8442);

  // Make pin 2 default HIGH, and attach INT to our handler
  pinMode(2, INPUT_PULLUP);
  pinMode(4,OUTPUT);
}

void loop()
{
  Blynk.run();
  checkPin();
}