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@doom369 doom369 doc updated 7e5dc4e Apr 27, 2018
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@vshymanskyy @doom369
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Download latest Blynk library here:
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:
Sketch generator:
Blynk community:
Follow us:
Blynk library is licensed under MIT license
This example code is in public domain.
Simple push notification example
App project setup:
Push widget
Connect a button to pin 2 and GND...
Pressing this button will also push a message! ;)
/* Comment this out to disable prints and save space */
#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";
void notifyOnButtonPress()
// Invert state, since button is "Active LOW"
int isButtonPressed = !digitalRead(2);
if (isButtonPressed) {
Serial.println("Button is pressed.");
// Note:
// We allow 1 notification per 5 seconds for now.
Blynk.notify("Yaaay... button is pressed!");
// You can also use {DEVICE_NAME} placeholder for device name,
// that will be replaced by your device name on the server side.
//Blynk.notify("Yaaay... {DEVICE_NAME} button is pressed!");
void setup()
// Debug console
// Setup notification button on pin 2
pinMode(2, INPUT_PULLUP);
// Attach pin 2 interrupt to our handler
attachInterrupt(digitalPinToInterrupt(2), notifyOnButtonPress, CHANGE);
void loop()
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